# Outdoor Power Equipment Guide

> Independent ownership reference for outdoor power equipment: mowers, chainsaws, trimmers, snow blowers, generators and pressure washers. What each specification means, how to measure the part you need when a label has worn off, how to work a symptom, what each season requires, and deterministic calculators that show their formulas. Every figure names its source; no manufacturer service figures are invented for named models.

Each link below points to a plain-Markdown version of the page. The human-readable HTML page is at the same path without the `.md` suffix.

## Equipment by class

- [Choose outdoor equipment by the work and operating limits](https://outdoorpowerequipmentguide.com/equipment.md): Compare equipment by load, access, material, slope, supply and service requirements; select a task guide before comparing model packages.
- [Choose an air compressor by delivered flow and duty limit](https://outdoorpowerequipmentguide.com/equipment/air-compressors.md): Compare airflow at the tool’s required pressure, tank reserve and duty cycle; a 5 CFM at 90 PSI compressor example separates output from storage.
- [Compare tool batteries by nominal energy and approved fit](https://outdoorpowerequipmentguide.com/equipment/battery-and-cordless-equipment.md): 20V MAX is not always nominal voltage; calculate a qualified watt-hour example and separate energy, power, runtime and charger compatibility.
- [Brush-cutter blades: verify the whole approved configuration](https://outdoorpowerequipmentguide.com/equipment/brush-cutters.md): Blade approval includes the guard or limit stop, handle and harness; FS 91/91 R examples explain why a straight shaft alone does not authorize a saw blade.
- [Choose a chainsaw by cutting task, weight and approved bar](https://outdoorpowerequipmentguide.com/equipment/chainsaws.md): Combine the saw and bar decision with usable weight, chain fit and safe work scope; a 30.1 cc example shows why bar inches cannot specify a complete saw.
- [Cut-off saws: wheel approval, depth and dust controls](https://outdoorpowerequipmentguide.com/equipment/cut-off-saws.md): A 14-inch wheel does not mean a seven-inch cut; verify actual depth, arbor, rated speed and material, then use task-specific silica controls.
- [Edging, aerating or dethatching: identify what the lawn needs](https://outdoorpowerequipmentguide.com/equipment/edgers-aerators-and-dethatchers.md): Separate boundary cutting, compaction and measured thatch; university guidance explains the half-inch threshold and why aeration is not automatic dethatching.
- [Hedge trimmers: reach, stem limits and safe handling](https://outdoorpowerequipmentguide.com/equipment/hedge-trimmers.md): Blade length and double-sided cutting are different from action and approved stem size; a 20-inch ECHO example separates advertised length from usable pass coverage.
- [Choose a leaf blower: airflow, nozzle, runtime and carrying](https://outdoorpowerequipmentguide.com/equipment/leaf-blowers.md): Compare leaf-blower ratings under the same nozzle and power setting; EGO’s 15-minute turbo versus 150-minute low example explains runtime claims.
- [Choose a leaf vacuum by collection task and claim definitions](https://outdoorpowerequipmentguide.com/equipment/leaf-vacuums-and-mulchers.md): Compare handheld, walk-behind and tow-behind collection; Toro’s 97-percent particle-size claim is different from a bag-volume reduction ratio.
- [Choose a log splitter by log fit, handling and full work cycle](https://outdoorpowerequipmentguide.com/equipment/log-splitters.md): Tonnage is not throughput: compare the actual log length, orientation, rated cycle and handling time; a worked 11-second example shows the difference.
- [Choose a pole saw by controlled reach and the branch drop zone](https://outdoorpowerequipmentguide.com/equipment/pole-saws.md): Separate shaft length from working reach; calculate a stated-angle example, plan the falling branch and keep the tool away from electrical lines.
- [Choose and size a generator for the loads and connection](https://outdoorpowerequipmentguide.com/equipment/portable-generators.md): Compare conventional, inverter and installed standby options; distinguish running and starting demand, overlapping motors, fuel ratings and safe outdoor placement.
- [Choose a pressure washer: flow, supply, nozzle and surface](https://outdoorpowerequipmentguide.com/equipment/pressure-washers.md): Select a pressure washer by inlet supply, pressure, flow, approved nozzle and pump care; worked examples separate output from inlet requirements.
- [Choose a mower by access, slope limits and mowing route](https://outdoorpowerequipmentguide.com/equipment/riding-and-zero-turn-mowers.md): Walk-behind, tractor and zero-turn decisions without acreage or slope shortcuts; compare actual configuration, gate width and a worked mowing-pass example.
- [Is a robotic mower right for the boundary, slope and schedule?](https://outdoorpowerequipmentguide.com/equipment/robotic-mowers.md): Check interior versus boundary slope limits, navigation and passages, operating schedule and used-machine recalls; percent grade is different from degrees.
- [Choose a snow blower by surface, clearance and snow load](https://outdoorpowerequipmentguide.com/equipment/snow-blowers.md): Combine single/two/three-stage comparisons with driveway pass arithmetic, manufacturer-specific gravel clearance and safe clog/startup instructions.
- [Plan a standby generator: fuel rating, transfer and service](https://outdoorpowerequipmentguide.com/equipment/standby-generators.md): Installer questions for a fixed standby system: model-specific fuel output, managed loads, transfer equipment, siting and calendar-plus-hour maintenance.
- [Choose a string trimmer and reload the approved head](https://outdoorpowerequipmentguide.com/equipment/string-trimmers-and-blowers.md): Match the trimmer’s approved line, head thread and guard; correct Speed-Feed loading example and 128CD/128LD thread differences replace generic reload advice.
- [Stump grinders and augers: access, utilities and rental cost](https://outdoorpowerequipmentguide.com/equipment/stump-grinders-and-earth-augers.md): Check public and private services before grinding or drilling; a Toro SGR-13 specification and itemized rental example clarify access, scope and cost.
- [Choose a tiller for soil, rows and controllable depth](https://outdoorpowerequipmentguide.com/equipment/tillers-and-chippers.md): Compare tiller traction and tine arrangements without universal soil claims; Honda’s 9/6-inch configuration illustrates row access and pass planning.
- [Walk-behind mowers: access, controls and clipping plan](https://outdoorpowerequipmentguide.com/equipment/walk-behind-mowers.md): Compare configured width, drive and mulching without terrain shortcuts; the blade-stop requirement and one-third-cut example support safer ownership decisions.
- [Choose a water pump from head, flow and permitted material](https://outdoorpowerequipmentguide.com/equipment/water-pumps.md): Read the pump curve instead of combining maximum flow and lift; Honda WB20 specifications and a 30-foot head example explain the selection task.
- [Choose a chipper or shredder by feed material and limits](https://outdoorpowerequipmentguide.com/equipment/wood-chippers-and-shredders.md): Separate chipper and shredder chute capacities, approved feed methods and safe shutdown; a 3-inch versus half-inch model example explains the difference.

## The engine underneath

- [Engine and machine maintenance: select the exact model](https://outdoorpowerequipmentguide.com/engines.md): Find oil, plugs, filters, service intervals and recalls by equipment and engine identity, retaining model, serial and manual-revision differences.
- [Ariens Deluxe: recall check, shear bolts and gearcase oil](https://outdoorpowerequipmentguide.com/engines/ariens-deluxe-snow-blower-maintenance.md): Check the 2025 Ariens recall by serial, then distinguish auger gearcase level, shear-bolt torque and engine service for the cited Deluxe models.
- [Briggs & Stratton EXi oil checks and kit identity](https://outdoorpowerequipmentguide.com/engines/briggs-and-stratton-exi-series-engine-maintenance.md): Use Just Check & Add instructions only on a Briggs engine equipped for that system. The complete model, type and code still identify its oil and.
- [Champion generator oil, plugs and service by model](https://outdoorpowerequipmentguide.com/engines/champion-100522-3500w-generator-maintenance.md): Compare oil, spark plugs and service for Champion100522,100571,200961 and 201052. Check fuel-specific output, battery care and recall identity.
- [Cub Cadet XT1/XT2: identify the engine before service](https://outdoorpowerequipmentguide.com/engines/cub-cadet-xt1-xt2-enduro-tractor-maintenance.md): Separate 547 cc Cub Cadet kit contents from Kohler/Kawasaki variants; use the engine manual for oil intervals and the tractor manual for chassis service.
- [DuroMax XP12000EH oil, service and used-unit checks](https://outdoorpowerequipmentguide.com/engines/duromax-xp12000eh-generator-maintenance.md): Check the XP12000EH manual revision, 1.2 L oil quantity, break-in hours, plug gap and a documented non-running asking-price example.
- [ECHO CS-310 chain fit, 50:1 fuel and service checks](https://outdoorpowerequipmentguide.com/engines/echo-cs-310-chainsaw-maintenance.md): CS-310chain pitch/gauge/link combinations and model-specific fuel/plug guidance; identify the actual bar before ordering a loop.
- [ECHO PB-580H/T filters, plug and fuel service](https://outdoorpowerequipmentguide.com/engines/echo-pb-580-backpack-blower-maintenance.md): PB-580H/T service from theJuly2023 manual: regionalplugidentity, 50:1 fuel, filterinspectionandcooling checks.
- [ECHO SRM-225 fuel, plug and gearbox service](https://outdoorpowerequipmentguide.com/engines/echo-srm-225-string-trimmer-maintenance.md): Separate USfuelrequirements from anSRM225regional manual; identify plug specification, 50 hour gearcase and 25hourflex-shaft service.
- [Read an engine’s EPA label without mistaking it for lifespan](https://outdoorpowerequipmentguide.com/engines/epa-emission-control-label.md): Use emission family, model year and compliance hours as certification identifiers; label exceptions and a worked hour example explain what they cannot prove.
- [Find equipment and engine IDs before ordering parts](https://outdoorpowerequipmentguide.com/engines/finding-model-and-serial-numbers.md): Separate machine model, engine model/type/code and component IDs; find stamped Briggs numbers and preserve exact serials for parts and recall lookup.
- [Generac GP generator oil, service and recall checks](https://outdoorpowerequipmentguide.com/engines/generac-gp6500-gp8000e-generator-maintenance.md): GP3300i, GP3500iO, GP6500 and GP8000E oil, plug and hour schedules, plus separate fuel-leak and handle recall checks.
- [Honda EU generator service: oil, plugs and serials](https://outdoorpowerequipmentguide.com/engines/honda-eu2200i-generator-maintenance.md): EU2200i, EU3000is and EU7000is service figures, serial-specific plug differences, hour logging, an owner load report and recall checks.
- [Honda GCV160/GCV190 oil refill and application-specific plugs](https://outdoorpowerequipmentguide.com/engines/honda-gcv160-gcv190-maintenance.md): Distinguish dry capacity from oil refill on GCV160/GCV190, choose the pressure-washer or other-application plug, and log the first 5-hour service.
- [Honda GX engine oil, plugs and separate oil reservoirs](https://outdoorpowerequipmentguide.com/engines/honda-gx120-gx160-gx200-maintenance.md): GX120–GX390 service lookup with model-specific oil and clearances, reduction-case and oil-bath distinctions, plus replacement-fit checks.
- [Honda HRN216 mower oil, blades and recall checks](https://outdoorpowerequipmentguide.com/engines/honda-hrn216-mower-maintenance.md): For the cited HRN216VKAA/VKPA manual, Honda gives 0.35–0.40 L oil refill, a five-hour or one-month initial change and later 50-hour/six-month oil.
- [Honda HS720 oil, paddles and scraper service](https://outdoorpowerequipmentguide.com/engines/honda-hs720-snow-blower-maintenance.md): HS720 single-stage snowblower service: 0.58 L oil, initial 5-hour change, 6-month/50-hour oil interval, BPR5ES plug and wear checks.
- [Husqvarna 125B blower service: plugs and manual revisions](https://outdoorpowerequipmentguide.com/engines/husqvarna-125b-leaf-blower-maintenance.md): For a 125B, confirm the actual serial and applicable manual before buying a spark plug. The older 125B/BX/BVX document contradicts its own plug table.
- [Husqvarna 128CD/128LD service: manual and head identity](https://outdoorpowerequipmentguide.com/engines/husqvarna-128cd-128ld-string-trimmer-maintenance.md): The 2023 128CD/LD manual lists QCJ-8Y, 0.6 mm gap and different head threads; compare 30 hour shaft service with older instructions.
- [Husqvarna 455/460 Rancher saw service and chain identity](https://outdoorpowerequipmentguide.com/engines/husqvarna-455-460-rancher-chainsaw-maintenance.md): For the cited 455/460 Rancher manual, match the exact saw and cutting attachment before choosing a chain or service part. It specifies BPMR7A or.
- [John Deere D110/D130/E130/E140: oil and engine service](https://outdoorpowerequipmentguide.com/engines/john-deere-d110-d130-e130-e140-lawn-tractor-maintenance.md): Separate the E130 Easy Change system from the cited D110, D130 and E140 conventional oil/filter service. The E130’s0.8 US qt cartridge renewal and 2.8.
- [Kawasaki FR651V–FR730V oil, filters and service hours](https://outdoorpowerequipmentguide.com/engines/kawasaki-fr651v-fr691v-fr730v-maintenance.md): Understand the 1.8 L versus2.1L refill distinction, two-plug service and the manual’s100/200 hour oil/filter schedules.
- [Kohler Command Pro CV oil and extended-service conditions](https://outdoorpowerequipmentguide.com/engines/kohler-command-pro-cv-v-twin-maintenance.md): CV17–CV750 service fromRevL: 1.6–1.8 L refill range, ordinary100 hour oil interval and the qualified300 hour oil-plus-filter option.
- [Kohler SH255–SH270 oil rules and air-cleaner schedules](https://outdoorpowerequipmentguide.com/engines/kohler-courage-sh255-sh265-sh270-maintenance.md): SH manualRevB: 0.60 L refill, ordinary versusPRO10W-50 oil intervals, 125 hour plug replacement and cleaner-specific service.
- [Kohler service-kit and filter lookup by engine specification](https://outdoorpowerequipmentguide.com/engines/kohler-engine-filter-spark-plug-and-kit-part-numbers.md): Reference SH, CH, CV and SV kit contents without treating dimensions or broad engine-family names as fit confirmation.
- [Find the right equipment, engine and pump manual](https://outdoorpowerequipmentguide.com/engines/manufacturer-support-and-manuals.md): Official manual finders with required identifiers; check serial range and revision, and separate operator instructions from illustrated parts books.
- [MTD159/196/224 cc oil and No Oil Change identification](https://outdoorpowerequipmentguide.com/engines/mtd-159cc-196cc-224cc-ohv-engine-maintenance.md): Form 769-26100 distinguishes labeledNoOilChangeengines from standard service; identify exact engine, plug and air-cleaner parts.
- [Small-engine oil capacity and spark-plug lookup](https://outdoorpowerequipmentguide.com/engines/oil-capacity-and-spark-plug-by-engine.md): Distinguish dry, refill and filter-change quantities; selected model-specific plug figures with links to service instructions and a Yamaha unit-conversion example.
- [Choose small-engine oil by viscosity and service category](https://outdoorpowerequipmentguide.com/engines/oil-grades-and-service-categories.md): Read SAE viscosity separately from API performance; match the engine’s temperature chart and interval, with a 2.4 L fill example and separate premix-oil rules.
- [Predator 173 cc service and mower replacement fit](https://outdoorpowerequipmentguide.com/engines/predator-173cc-vertical-engine-maintenance.md): Item69731 oil, plug and shaft checks; compare the full engine identity, mounting and blade adapter before replacing a mower engine.
- [Predator inverter oil and plugs: 59135 versus 57509](https://outdoorpowerequipmentguide.com/engines/predator-2000-inverter-generator-maintenance.md): Identify Predator item59135 and 57509 before servicing oil, plug or CO-sensor faults; their model names conceal different running ratings.
- [Predator 212 oil, plug and horizontal-shaft fit](https://outdoorpowerequipmentguide.com/engines/predator-212-engine-maintenance.md): Use the older 68120/68121 manual only for its matching Predator 212 engine; check oil, plug, shaft dimensions and the two break-in periods.
- [Simpson pressure washer: engine versus pump oil service](https://outdoorpowerequipmentguide.com/engines/simpson-pressure-washer-maintenance.md): Identify a sealed or serviceable pump before changing oil; separate the broad hot-water manual from engine-specific capacities and pressure-washer maintenance.
- [STIHL BR500/BR600 service and fuel-cap recall identity](https://outdoorpowerequipmentguide.com/engines/stihl-br-500-br-600-backpack-blower-maintenance.md): 50:1 fuel and CMR6H/USR4AC plug guidance forBR500/600, plus actual tool-lesscap recall identity and correct kit-family checks.
- [STIHL FS56, FS91 and FS111 fuel and service differences](https://outdoorpowerequipmentguide.com/engines/stihl-fs-56-string-trimmer-maintenance.md): Separate FS56 two-stroke service from FS91/FS111 mixture-lubricated four-strokes, with model-specific plugs, valve and felt-filter checks.
- [STIHL MS170–MS271 fuel, chain and service differences](https://outdoorpowerequipmentguide.com/engines/stihl-ms-170-ms-180-chainsaw-maintenance.md): MS170,180,210,230,250and271 service: 50:1 fuel, 0.5 mm plug gap, bar/chain identity and the model-specific kit serial restriction.
- [STIHL service kits: part identity, contents and listed prices](https://outdoorpowerequipmentguide.com/engines/stihl-service-kit-part-numbers.md): Compare STIHLsaw, trimmer andblowerkit families, including a model-specificseriallimit and dated manufacturer asking prices.
- [Toro Recycler service: model-specific oil and drive checks](https://outdoorpowerequipmentguide.com/engines/toro-22-recycler-mower-maintenance.md): Distinguish Recycler model, engine and serial range for oil refill, plug, blade torque and drive-belt care, with sources and an owner repair example.
- [Toro 826LE snowblower service: engine oil and gearbox](https://outdoorpowerequipmentguide.com/engines/toro-826le-power-max-snowthrower-maintenance.md): For the cited Toro 826LE model 38620, serial250000001 and up, the manual gives a maximum26 US fl oz of engine oil and an RJ-19LM plug family. Its auger.
- [Toro TimeCutter SW service: oil, filters and calendar limits](https://outdoorpowerequipmentguide.com/engines/toro-timecutter-sw4200-sw5000-maintenance.md): Model 74675/74680 service from form 3398-979: first five hours or one month, 2.4 L capacity, 100-hour/yearly oil and separate paper/foam filter care.
- [Troy-Bilt Storm parts: match width, belt style and engine](https://outdoorpowerequipmentguide.com/engines/troy-bilt-storm-2410-2620-2840-snow-blower-parts.md): Use the 2013 Storm 2410/2620/2840 parts book for shear pins, width-specific shave plates and standard versus four-way large-block belt identifiers.
- [Two-stroke or four-stroke: identify the lubrication system](https://outdoorpowerequipmentguide.com/engines/two-stroke-and-four-stroke.md): Fuel and oil decisions for ordinary two-strokes, sump-lubricated four-strokes and STIHL 4-MIX exceptions; cap count alone cannot identify the required fuel.
- [Westinghouse iGen4500 generator oil and plug service](https://outdoorpowerequipmentguide.com/engines/westinghouse-igen4500-generator-maintenance.md): For the cited gasoline iGen4500, use600 ml of 10 W-30 oil and the 97109/F7RTC plug specification. Its first oil change is 25 hours or the first month..
- [Yamaha EF2200iS oil quantity, plug and first service](https://outdoorpowerequipmentguide.com/engines/yamaha-ef2200is-generator-maintenance.md): Resolve the EF2200iS manual’s oil-unit mismatch; use its level check, BPR6HS plug specification and hour-based service schedule.
- [Westinghouse WGen2000 and WGen3600 service](https://outdoorpowerequipmentguide.com/engines/westinghouse-wgen2000-wgen3600-generator-maintenance.md): Read WGen2000/3600 gasoline-model oil, F7TC plug and 20-hour initial service figures, with output limits kept separate.
- [Westinghouse WGen9500 oil and service limits](https://outdoorpowerequipmentguide.com/engines/westinghouse-wgen9500-generator-maintenance.md): WGen9500 gasoline-model service: 1.1 L oil, F7TC plug and 25-hour initial change, with running versus peak output explained.
- [Honda HRC216HXA commercial mower service](https://outdoorpowerequipmentguide.com/engines/honda-hrc216-mower-maintenance.md): Service the HRC216HXA engine, hydrostatic drive and stacked blades using the commercial mower’s actual manual and parts identity.
- [Honda HRX217: revision, oil and blade checks](https://outdoorpowerequipmentguide.com/engines/honda-hrx217-mower-maintenance.md): Identify the HRX217 revision before choosing oil, the VH7 blade pair or a camshaft-recall remedy. Refill and engine versions differ.
- [Briggs 120000–210000: match manual form 277040](https://outdoorpowerequipmentguide.com/engines/briggs-stratton-120000-150000-200000-210000-maintenance.md): Match Briggs form 277040 to model, type and code before using its 20 or 28 fluid-ounce oil quantities and initial service interval.
- [Briggs Intek 210000–310000 oil and filter service](https://outdoorpowerequipmentguide.com/engines/briggs-stratton-intek-210000-280000-310000-maintenance.md): Read form 276344’s filter-dependent 44/48 fluid-ounce quantities and service schedule without substituting EXi Just Check & Add instructions.
- [Husqvarna 130BT and 350BT backpack-blower service](https://outdoorpowerequipmentguide.com/engines/husqvarna-130bt-350bt-backpack-blower-maintenance.md): Compare 130BT/350BT backpack tank, plug and filling instructions, including the older manual and later 350BT revision.
- [John Deere X300 and X320: engine-qualified service kits](https://outdoorpowerequipmentguide.com/engines/john-deere-x300-x320-lawn-tractor-maintenance.md): Match an X300 or X320’s FH/FS engine to its Deere kit, oil filter and plug; distinguish sheet capacities from an actual refill.
- [Toro Power Clear 721: oil, paddle and cable service](https://outdoorpowerequipmentguide.com/engines/toro-power-clear-721-snow-blower-maintenance.md): Power Clear 721 single-stage service: oil level, plug identity, cable inspection and rotor wear indicators from the applicable manual.
- [Husqvarna 340, 345 and 350: fuel and service identity](https://outdoorpowerequipmentguide.com/engines/husqvarna-340-345-350-chainsaw-maintenance.md): Keep 340/345/350 fuel and chain-oil reservoirs separate, identify the specified plug and use the actual attachment and maintenance instructions.
- [Husqvarna 435 II and 440 II chain and service checks](https://outdoorpowerequipmentguide.com/engines/husqvarna-435-440-chainsaw-maintenance.md): Match 435 II/440 II chain pitch, gauge and drive links together; compare the approved example and model-specific service evidence.
- [Husqvarna 545 and 550XP Mark II: generation-specific service](https://outdoorpowerequipmentguide.com/engines/husqvarna-545-550xp-mark-ii-chainsaw-maintenance.md): Distinguish 545/550XP Mark II from Gen1 kits, with CMR6H plug, reservoir and maintenance information tied to the cited revision.

## Parts, identified by measurement

- [Identify replacement parts by application and measurements](https://outdoorpowerequipmentguide.com/parts.md): Use exact model, serial and revision first, then confirm dimensions and approval; an old part may already be wrong and measurement alone cannot establish fit.
- [Air and fuel filters: identify the element before cleaning](https://outdoorpowerequipmentguide.com/parts/air-and-fuel-filters.md): Paper and foam do not share one service rule: compare Honda’s limited-air instruction, Toro’s prohibition, Kawasaki’s no-oil rule and STIHL felt-filter care.
- [Starting batteries: voltage, group, terminals and CCA](https://outdoorpowerequipmentguide.com/parts/batteries.md): A group code is not a cranking rating; compare Interstate U1/U1R examples and separate CCA from amp-hours, charger compatibility and safe installation.
- [Identify a replacement belt by part number, profile and duty](https://outdoorpowerequipmentguide.com/parts/belts.md): Length conventions are not universal interchange rules; use Gates’ 4L380 example, model-specific belt alternatives and a documented wrong-length drive fault.
- [Match chainsaw chain: pitch family, gauge and drive links](https://outdoorpowerequipmentguide.com/parts/chainsaw-chain-pitch-gauge-and-drive-links.md): Measure three rivets, confirm low-profile versus standard pitch family and count drive links; Oregon’s 91PXL055CK example demonstrates a complete qualified order.
- [Mower-blade replacement: approved fit, condition and torque](https://outdoorpowerequipmentguide.com/parts/mower-blades.md): Match the full blade assembly, not only inches; compare two Toro torque instructions and inspect worn lift surfaces, cracks and mounting hardware.
- [Mufflers and spark arresters: approved assembly and service](https://outdoorpowerequipmentguide.com/parts/mufflers-and-spark-arrestors.md): A muffler is not automatically a qualified spark arrester; check the Forest Service guide, actual machine service instructions and local fire restrictions.
- [Spark-plug replacement: fit, heat range, gap and installation](https://outdoorpowerequipmentguide.com/parts/spark-plugs.md): Thread diameter is not a harmless mismatch; verify reach, seat, approved heat range and torque, with NGK-specific numbering and anti-seize instructions.
- [Lawn-equipment wheels and tires: fit, cold pressure and wear](https://outdoorpowerequipmentguide.com/parts/wheels-tires-and-bearings.md): Read size and load with the actual wheel application, use the machine’s cold-pressure instructions and avoid making all tires equal by a generic rule.

## Troubleshooting, worked in order

- [Equipment troubleshooting: choose the observed symptom](https://outdoorpowerequipmentguide.com/troubleshooting.md): Choose no-crank, no-start, hot-running, electrical or driven-equipment checks by actual observation; symptoms guide tests rather than prove parts.
- [Compressor pressure faults: tank, regulator or tool demand](https://outdoorpowerequipmentguide.com/troubleshooting/air-compressor-wont-build-or-hold-pressure.md): Read both gauges and the actual cut-in instructions; a connected tool dropping pressure does not prove a failed check valve, and a leaking tank must leave service.
- [When to replace a working battery: compare runtime](https://outdoorpowerequipmentguide.com/troubleshooting/battery-pack-lifespan-and-when-to-replace.md): Compare repeatable runtime under similar conditions, check automatic storage discharge and price a supported replacement without inventing remaining life.
- [Battery tool loses power or will not charge: fault checks](https://outdoorpowerequipmentguide.com/troubleshooting/battery-tool-loses-power-or-wont-charge.md): Read actual pack and charger warnings, permitted temperatures and compatibility. A safe swap narrows a fault; it does not prove every component.
- [Carburetor repair: clean, rebuild or replace](https://outdoorpowerequipmentguide.com/troubleshooting/carburetor-clean-rebuild-or-replace.md): Establish a fuel-metering fault first, identify the exact carburetor, and compare repair scope without universal soaking, adjustment or rebuild promises.
- [Chainsaw cuts crooked or smokes: cutting-system checks](https://outdoorpowerequipmentguide.com/troubleshooting/chainsaw-cuts-crooked-or-smokes.md): Stop and inspect matched chain, bar, sprocket, tension and lubrication. Sawdust and tank consumption alone do not identify the cause.
- [Engine popping: intake backfire versus exhaust afterfire](https://outdoorpowerequipmentguide.com/troubleshooting/engine-backfires-or-pops.md): Record where and when the pop occurs, use the prescribed shutdown, and separate recoil kickback or blade-impact damage from ordinary mixture assumptions.
- [Engine overheats or stops hot: cooling, oil and load](https://outdoorpowerequipmentguide.com/troubleshooting/engine-overheats-or-dies-when-hot.md): A hot stall does not prove a coil fault; inspect permitted cooling areas and oil level, retain guards and separate fuel, ignition and shutdown-system diagnosis.
- [Engine starts then dies: record settings, load and warnings](https://outdoorpowerequipmentguide.com/troubleshooting/engine-starts-then-dies.md): Distinguish starting-setting, fuel-delivery, load and hot-running faults; a timed stall does not prove a cap, carburetor or ignition coil.
- [Engine will not start: cranking, ignition and fuel checks](https://outdoorpowerequipmentguide.com/troubleshooting/engine-will-not-start.md): Identify whether the engine turns, then check approved controls, fuel, oil and model-specific tests without starting fluid or bypassed safety circuits.
- [Fuel lines and bulbs: purge, primer and shutoff checks](https://outdoorpowerequipmentguide.com/troubleshooting/fuel-lines-primer-bulb-and-shutoff-valve.md): A purge bulb returns fuel to the tank; do not diagnose every soft bulb as a failed valve or replace hoses without the actual routing and fuel compatibility.
- [Generator runs without power: indicators and outlet limits](https://outdoorpowerequipmentguide.com/troubleshooting/generator-runs-but-no-power.md): Separate no output, protective shutdown and load collapse using the model manual; never improvise field flashing, defeat GFCI protection or backfeed a building.
- [Log splitter will not split or return: hydraulic checks](https://outdoorpowerequipmentguide.com/troubleshooting/log-splitter-wont-split-or-return.md): Record direction, load, leakage and controls; use the actual fluid procedure and avoid hand leak checks or relief-valve adjustments based on symptoms alone.
- [Low compression: use the correct test and interpret its limits](https://outdoorpowerequipmentguide.com/troubleshooting/low-compression-diagnosis.md): Interpret compression and leak-down tests by the actual engine procedure; a rope’s feel or generic PSI limit cannot identify every internal fault.
- [Uneven mower cut: blades, tires and deck geometry](https://outdoorpowerequipmentguide.com/troubleshooting/mower-cuts-unevenly.md): Describe the cut pattern, inspect safely and use the actual deck-leveling tolerances; different axles may have different tire-pressure instructions.
- [Mower will not drive: release, belt and transmission checks](https://outdoorpowerequipmentguide.com/troubleshooting/mower-wont-drive-hydrostatic-or-self-propelled.md): Separate self-propelled and rider controls, inspect with power isolated, and use model-specific belt and transmission procedures rather than a universal hydro purge.
- [No spark: verify the test before replacing the ignition coil](https://outdoorpowerequipmentguide.com/troubleshooting/no-spark-plug-coil-kill-switch.md): Use the approved tester, retain required safety circuits, and distinguish spark absence from wrong timing, a hot fault or a plug-fit problem.
- [Low-oil shutdown and hydrolock are different no-start problems](https://outdoorpowerequipmentguide.com/troubleshooting/oil-level-shutdown-and-hydrolock.md): Check the prescribed oil level without bypassing protection; a locked engine needs safe diagnosis before any further cranking or liquid-clearing attempt.
- [Pressure washer has no pressure: inlet and nozzle checks](https://outdoorpowerequipmentguide.com/troubleshooting/pressure-washer-has-no-pressure.md): Measure the manual’s required water supply, inspect the approved inlet and nozzle, and separate low pressure from soap mode without adjusting an unloader blindly.
- [Pull-cord problems: stuck rope, slipping drive or kickback](https://outdoorpowerequipmentguide.com/troubleshooting/recoil-starter-and-pull-cord-problems.md): Stop for a locked rope or forceful kickback. Check recall applicability and the exact recoil assembly before assuming spring or engine failure.
- [Mower PTO will not engage: follow the actual interlock diagram](https://outdoorpowerequipmentguide.com/troubleshooting/riding-mower-pto-wont-engage.md): A clutch click does not prove torque transfer; distinguish control conditions, supply, clutch and belt faults without defeating a seat switch or guessing fuse size.
- [Snow blower will not throw: safe chute and drive checks](https://outdoorpowerequipmentguide.com/troubleshooting/snow-blower-will-not-throw.md): Use the clearing tool, actual shear part and cable/belt instructions; do not inspect an engaged auger up close or substitute a hardware bolt.
- [Starter clicks without cranking: battery and circuit checks](https://outdoorpowerequipmentguide.com/troubleshooting/starter-clicks-but-engine-wont-crank.md): A click does not prove the solenoid passes starter current; compare load and voltage-drop tests with the actual circuit and keep interlocks intact.
- [Surging and hunting: check the load, fuel and governor system](https://outdoorpowerequipmentguide.com/troubleshooting/surging-and-hunting.md): Separate a repeated speed cycle from inverter economy response, identify fuel and intake restrictions, and avoid changing governed speed to hide a fault.
- [Tiller bounces or vibrates: separate setup, ground and damage](https://outdoorpowerequipmentguide.com/troubleshooting/tiller-vibrates-or-wont-dig.md): Check actual tine arrangement, soil, depth and damage with power isolated; front-tine equipment is not universally incapable of new ground.
- [Water in fuel: contamination checks and safe removal](https://outdoorpowerequipmentguide.com/troubleshooting/water-in-fuel-after-rain-or-storage.md): A stall after rain is a clue, not proof of water; arrange safe fuel inspection, correct the entry path and use local hazardous-waste instructions.
- [Water pump runs without flow: prime, suction and head checks](https://outdoorpowerequipmentguide.com/troubleshooting/water-pump-loses-prime-or-wont-move-water.md): Use the actual pump curve and cold priming procedure, retain rated suction hose and strainers, and avoid opening a hot pump or running a dry test.

## Seasonal care

- [Seasonal equipment care: storage, restart and service timing](https://outdoorpowerequipmentguide.com/seasonal.md): Select the actual task rather than a universal seasonal tune-up: fuel preparation, pump preservation, battery care, restart and hour/calendar maintenance.
- [Autumn changeover: store summer tools, check winter equipment](https://outdoorpowerequipmentguide.com/seasonal/autumn-changeover.md): Prepare stored summer tools and winter equipment by the actual fuel, pump, battery and recall instructions; avoid a universal tune-up checklist.
- [Cold-weather starting: fuel, oil, battery and controls](https://outdoorpowerequipmentguide.com/seasonal/cold-weather-starting.md): Use the model’s cold-start sequence and temperature-qualified oil; a Toro 826LE chart example explains Fahrenheit/Celsius conversion without a universal primer rule.
- [Stored gasoline: fuel approval, stabilizer dose and age](https://outdoorpowerequipmentguide.com/seasonal/ethanol-fuel-and-stabilizer.md): Check EPA fuel-use limits, equipment approval, storage period and the actual stabilizer formulation before treating or replacing fuel.
- [Generator exercise and break-in: use the actual schedule](https://outdoorpowerequipmentguide.com/seasonal/generator-exercise-and-break-in.md): Separate first-hours loading and oil service from periodic readiness; Champion and Predator manuals show different break-in limits, with no universal 20-minute test.
- [Maintenance schedules: hours, dates and working conditions](https://outdoorpowerequipmentguide.com/seasonal/maintenance-schedule.md): Apply the earlier hour or calendar limit, keep initial service separate and respect model exceptions, using a worked service-log example.
- [Spring startup: inspect stored equipment before testing](https://outdoorpowerequipmentguide.com/seasonal/spring-startup.md): Inspect stored equipment, fluids, attachments and controls before starting. Check actual tire settings and generator loads by model.
- [Winter storage: fuel, water and battery instructions](https://outdoorpowerequipmentguide.com/seasonal/winter-storage.md): Prepare fuel, pump water and batteries by component instructions. Keep preservation intact and use the applicable restart procedure.

## Safety, by mechanism

- [Outdoor equipment safety: recalls, CO, cutting and rollover](https://outdoorpowerequipmentguide.com/safety.md): Find primary-source guidance on generator placement, chainsaw protection and reactions, slope limits, fuel handling, recalls and properly dated injury statistics.
- [Chainsaw kickback: nose contact and safety checks](https://outdoorpowerequipmentguide.com/safety/chainsaw-kickback.md): Distinguish rotational kickback from pull-in and pushback; a chain brake and low-kickback cutting system reduce risk without guaranteeing protection.
- [Chainsaw protective clothing: fit, coverage and retirement](https://outdoorpowerequipmentguide.com/safety/chainsaw-protective-clothing.md): Select leg protection for the saw and intended use, check coverage with boots and follow the garment’s care instructions; size labels are not ordinary trouser sizes.
- [Check an equipment recall by model, serial and repair status](https://outdoorpowerequipmentguide.com/safety/checking-a-recall.md): Search CPSC titles, then read the complete notice and manufacturer serial lookup; a real Ariens example shows why model names and broad ranges are insufficient.
- [Equipment fuel: containers, handling and storage limits](https://outdoorpowerequipmentguide.com/safety/fuel-handling-and-storage.md): Use approved containers and cool-engine refueling; Bluffdale’s posted limits illustrate why local storage rules and recommendations must stay separate.
- [Generator carbon monoxide: placement and emergency action](https://outdoorpowerequipmentguide.com/safety/generator-carbon-monoxide.md): Use CPSC outdoor separation and exhaust guidance; recognize CO symptoms and emergency action without treating automatic shutdown as placement approval.
- [Mower injury figures: read the dates and act on the hazards](https://outdoorpowerequipmentguide.com/safety/lawn-mower-injury-patterns.md): Read CPSC mower injury estimates with their actual equipment types and years; avoid treating unlike periods or raw counts as personal risk rates.
- [Mower slope limits: degrees, grade and the actual machine](https://outdoorpowerequipmentguide.com/safety/slopes-and-rollover.md): Convert percent grade correctly, follow the model’s direction and terrain restrictions, and use its ROPS/seat-belt instructions; no slope number guarantees safety.

## Calculators (deterministic, formulas shown)

- [Six equipment calculators: select the calculation](https://outdoorpowerequipmentguide.com/calculators.md): Choose load planning, fuel ratio, chain measurements, cord voltage drop, nozzle size or a covered serial format, with visible formulas and examples.
- [Chain measurement calculator: pitch, gauge and drive links](https://outdoorpowerequipmentguide.com/calculators/chainsaw-chain-finder.md): Calculate half the three-rivet span, keep low-profile chain separate, and verify approved saw/bar/sprocket fit before ordering.
- [Generator cord voltage-drop calculator](https://outdoorpowerequipmentguide.com/calculators/generator-extension-cord.md): Screen copper conductor gauges by voltage drop; verify the complete cord, connectors, load and outdoor rating separately rather than assuming ampacity from gauge.
- [Generator sizing: running reserve and one-motor start](https://outdoorpowerequipmentguide.com/calculators/generator-sizing.md): Compare continuous watts and a clearly assumed one-motor start; check actual VA, power factor, simultaneous starts and outlet/fuel ratings separately.
- [Pressure-washer nozzle calculator: orifice number and flow](https://outdoorpowerequipmentguide.com/calculators/pressure-washer-nozzle.md): Calculate nozzle number and a listed size above it; compare modeled pressure while checking approved angle, connector and component ratings.
- [Equipment serial and date-code decoder: verify the format](https://outdoorpowerequipmentguide.com/calculators/serial-number-decoder.md): Decode covered Briggs and Husqvarna formats, limited Kohler year codes and MTD month/day fields without guessing a decade or inventing a calendar date.
- [Fuel-mix calculator: oil for a specified gasoline volume](https://outdoorpowerequipmentguide.com/calculators/two-stroke-fuel-mix.md): Calculate oil in US fluid ounces and milliliters from the specified gasoline volume and ratio. Keep US and imperial units separate.

## About this site

- [Accessibility and reporting a problem](https://outdoorpowerequipmentguide.com/accessibility.md): Use the skip link, headings and labeled forms; report the page, task and assistive-technology behavior when a feature is difficult to use.
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- [Gas or battery equipment: price the whole working session](https://outdoorpowerequipmentguide.com/buying/gas-vs-battery-for-your-yard.md): Compare actual workload, charging access and complete gas or battery packages using stated examples and model-qualified runtime limits.
- [Repair or replace equipment: compare diagnosed costs and scope](https://outdoorpowerequipmentguide.com/buying/repair-or-replace-old-equipment.md): Use a written diagnosis, parts availability and a real replacement listing; a $240/$499 example is a comparison, not a universal half-price rule.
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- [Equipment glossary: power, fluid, chain and service terms](https://outdoorpowerequipmentguide.com/glossary.md): Read concise equipment definitions with links to model-qualified examples; keep units, certification scope and application limits separate.
- [Equipment evidence policy: specifications, reports and prices](https://outdoorpowerequipmentguide.com/methodology.md): Keep model-qualified service facts, regulator notices, owner accounts and asking prices distinct when comparing equipment or assessing a repair.
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