Dirt Bike Engine
4639 parts
Pistons, top-end kits, gaskets, cylinders, valves, bearings and seals from Vertex, ProX, Wossner, Athena, Cometic, WSM, Boyesen and Moose Offroad. Everything you need for a fresh top end, a full rebuild or a little more power. Shop all dirt bike parts.
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Out of stock
Moose Offroad - Piston Ring - For 66.35/66.36 mm Piston - Multiple Models
Moose Offroad
$41.95Moose Offroad - 09120405 - Piston Ring - For 66.35/66.36 mm PistonFeaturesWear resistant made either from nitride or are chrome platedSpecs<$41.95 -
Out of stock
Moose Offroad - Piston Kit - 71.95 mm - Husqvarna | KTM
Moose Offroad
$141.95Moose Offroad - 09102714 - Piston Kit - 71.95 mm - Husqvarna | KTMFeaturesWrist pin is nitride-coated, providing a hardened, wear-resistant bearing surfaceCoated skirt ease break-in, decreasing wear...$141.95 -
Out of stock
Moose Offroad - Piston Kit - 66.35 mm - Fits Yamaha 1999-2023 YZ250, 2016-2019 YZ250X
Moose Offroad
$183.95Moose Offroad - 09102684 - Piston Kit - 66.35 mm - YamahaFeaturesWrist pin is nitride-coated, providing a hardened, wear-resistant bearing surfaceCoated skirt ease break-in, decreasing wear and...$183.95 -
Out of stock
Moose Offroad - Piston Kit - 53.94 mm - Honda
Moose Offroad
$99.95Moose Offroad - 09102689 - Piston Kit - 53.94 mm - HondaFeaturesWrist pin is nitride-coated, providing a hardened, wear-resistant bearing surfaceCoated skirt ease break-in, decreasing wear and aiding...$99.95 -
Out of stock
Moose Offroad - Piston Ring - For 66.34/66.35 mm Piston
Moose Offroad
$32.95Moose Offroad - 09120414 - Piston Ring - For 66.34/66.35 mm PistonFeaturesWear resistant made either from nitride or are chrome platedSpecs<$32.95 -
Out of stock
Moose Offroad - Cylinder - 76.00 mm - Husaberg | KTM - Fits KTM 2006-2013 250 EXC-F, 2005-2012 250 SX-F, 2006-2012 250 XC-F, 2006-2013 250 XCF-W
Moose Offroad
$517.23Moose Offroad - 09310465 - Cylinder - 76.00 mm - Husaberg | KTMFeaturesExtremely durable low-friction bore surface allows for greater heat dissipationMade from cast aluminum; nickel silicon carbide...$517.23 -
Out of stock
Moose Offroad - Cylinder - 76.80 mm - Fits 2010-2017 Honda CRF250R
Moose Offroad
$377.95Moose Offroad - 09310447 - Cylinder - 76.80 mm - HondaFeaturesExtremely durable low-friction bore surface allows for greater heat dissipationMade from cast aluminum; nickel silicon carbide...$377.95 -
Out of stock
Moose Offroad - Valve Shim - 7.48 x 3.30 - 5 pack
Moose Offroad
$9.95Moose Offroad - 09261900 - Valve Shim - 7.48 x 3.30 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$9.95 -
Out of stock
Moose Offroad - Valve Shim - 7.48 x 2.95 - 5 pack
Moose Offroad
$9.95Moose Offroad - 09261893 - Valve Shim - 7.48 x 2.95 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$9.95 -
Out of stock
Moose Offroad - Valve Shim - 7.48 x 3.00 - 5 pack
Moose Offroad
$9.95Moose Offroad - 09261894 - Valve Shim - 7.48 x 3.00 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$9.95 -
Out of stock
Moose Offroad - Valve Shim - 7.48 x 2.85 - 5 pack
Moose Offroad
$9.95Moose Offroad - 09261891 - Valve Shim - 7.48 x 2.85 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$9.95 -
Out of stock
Moose Offroad - Valve and Spring Kit - KTM RSF Engine 400 cc - 560 cc
Moose Offroad
$196.95Moose Offroad - 09262464 - Valve and Spring Kit - KTM RSF Engine 400 cc - 560 ccFeaturesExtend the life of the valve train and intake components by as much as 4x over the OEM titanium partsValves are...$196.95 -
Out of stock
Moose Offroad - Valve and Spring Kit - Honda CRF450R - Fits 2009-2012 Honda CRF450R
Moose Offroad
$196.95Moose Offroad - 09262430 - Valve and Spring Kit - Honda CRF450RFeaturesExtend the life of the valve train and intake components by as much as 4x over the OEM titanium partsValves are designed to not...$196.95 -
Out of stock
Moose Offroad - Cylinder - 48.50 mm - Fits 2006-2013 Kawasaki KX85
Moose Offroad
$543.95Moose Offroad - 09310623 - Cylinder - 48.50 mm - KawasakiFeaturesExtremely durable low-friction bore surface allows for greater heat dissipationMade from cast aluminum; nickel silicon carbide...$543.95 -
Out of stock
Moose Offroad - Piston Ring - For 39.47 mm Piston
Moose Offroad
$20.95Moose Offroad - 09120394 - Piston Ring - For 39.47 mm PistonFeaturesWear resistant made either from nitride or are chrome platedSpecs$20.95 -
Out of stock
Moose Offroad - Cam Chain - 92RH10 x 122 Links - Honda
Moose Offroad
$7.95Moose Offroad - 09250800 - Cam Chain - 92RH10 x 122 Links - HondaFeaturesLightweight and great durabilityFeatures precision solid bushings and shot-peened, providing maximum strengthMade to meet or...$7.95 -
Out of stock
Moose Offroad - Ring Set - For 95 mm Piston - Fits 2016-2022 Husqvarna FC 450 13.5:1 Pro Race Piston, 2016-2024 KTM 450 SX-F 13.5:1 Pro Race Piston
Moose Offroad
$35.95Moose Offroad - 09120603 - Ring Set - For 95 mm PistonFeaturesBe sure to use race fuel with some applications.Specs$35.95 -
Out of stock
Moose Offroad - Valve Shim - 10.0 x 2.45 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261842 - Valve Shim - 10.0 x 2.45 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Out of stock
Moose Offroad - Valve Shim - 7.48 x 1.25 - 5 pack
Moose Offroad
$9.95Moose Offroad - 09261859 - Valve Shim - 7.48 x 1.25 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$9.95 -
Out of stock
Moose Offroad - Valve Shim - 10.0 x 2.70 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261847 - Valve Shim - 10.0 x 2.70 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Out of stock
Moose Offroad - Valve Shim - 10.0 x 2.35 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261840 - Valve Shim - 10.0 x 2.35 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Out of stock
Moose Offroad - Complete Motor Gasket Kit - Ducati/KTM
Moose Offroad
$129.09Moose Offroad - 09342892 - Complete Motor Gasket Kit - Ducati/KTMFeaturesHigh-tech materials provide unmatched reliability and performanceRebuild the engine and transmission with total confidence as...$129.09 -
Out of stock
Moose Offroad - Valve Shim - 10.0 x 2.10 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261835 - Valve Shim - 10.0 x 2.10 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Out of stock
Moose Offroad - Valve Shim - 7.48 x 3.45 - 5 pack
Moose Offroad
$9.95Moose Offroad - 09261903 - Valve Shim - 7.48 x 3.45 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$9.95 -
Out of stock
Moose Offroad - Valve Shim - 7.48 x 3.05 - 5 pack
Moose Offroad
$9.95Moose Offroad - 09261895 - Valve Shim - 7.48 x 3.05 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$9.95 -
Out of stock
Moose Offroad - Valve Shim - 7.48 x 2.70 - 5 pack
Moose Offroad
$9.95Moose Offroad - 09261888 - Valve Shim - 7.48 x 2.70 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$9.95 -
Out of stock
Moose Offroad - Valve Shim - 7.48 x 2.55 - 5 pack
Moose Offroad
$9.95Moose Offroad - 09261885 - Valve Shim - 7.48 x 2.55 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$9.95 -
Out of stock
Moose Offroad - Gasket Material - Blue - .062" - 2 Pack
Moose Offroad
$46.41Moose Offroad - 09346978 - Gasket Material - Blue - .062" - 2 PackFeaturesMaterial is premium compressed sheet, manufactured with aramid and other synthetic fibers and uses an NBR (Nitrile Butadiene...$46.41 -
Out of stock
Moose Offroad - Head Cover Gasket - Husqvarna/KTM - Multiple Husqvarna/KTM Models
Moose Offroad
MSRP: $17.71$17.49Moose Offroad - 09345904 - Head Cover Gasket - Husqvarna/KTMFeaturesHigh-tech materials provide unmatched reliability and performanceRebuild the engine and transmission with total confidence as each...MSRP: $17.71$17.49 -
Out of stock
Moose Offroad - Motor Gasket Kit with Oil Seal - Honda
Moose Offroad
$70.33Moose Offroad - M811205 - Motor Gasket Kit with Oil Seal - HondaFeaturesRebuild the engine and transmission with total confidence as each set is designed for durability and accurate fitOil seals are...$70.33 -
Out of stock
Moose Offroad - Head Cover Gasket - Fits 2017-2019 Kawasaki KX250F
Moose Offroad
$43.80Moose Offroad - 09345906 - Head Cover Gasket - KawasakiFeaturesHigh-tech materials provide unmatched reliability and performanceRebuild the engine and transmission with total confidence as each set...$43.80 -
Out of stock
Moose Offroad - Complete Motor Gasket Kit - Husqvarna
Moose Offroad
MSRP: $77.72$62.57Moose Offroad - 09346106 - Complete Motor Gasket Kit - HusqvarnaFeaturesHigh-tech materials provide unmatched reliability and performanceRebuild the engine and transmission with total confidence as...MSRP: $77.72$62.57 -
Out of stock
Moose Offroad - Engine Oil Seal Kit - Fits 1996-2024 Suzuki DR650SE
Moose Offroad
$35.24Moose Offroad - 09351018 - Engine Oil Seal Kit - SuzukiFeaturesMade in the USADoes not include valve stem seal.Specs$35.24 -
Out of stock
Moose Offroad - Circlip
Moose Offroad
$3.95Moose Offroad - 09130192 - CirclipFeaturesSpecsMaterialStainless Steel$3.95 -
Out of stock
Moose Offroad - Connecting Rod - Fits 2005-2007 Suzuki RM-Z450
Moose Offroad
$474.95Moose Offroad - 09230311 - Connecting Rod - SuzukiFeatures100% machined from an oversized forging ensures proper grain flow and consistency through the manufacturing processMade from proprietary...$474.95 -
Out of stock
Moose Offroad - Ring Set - For 96 mm Piston
Moose Offroad
$35.95Moose Offroad - 09120602 - Ring Set - For 96 mm PistonFeaturesBe sure to use race fuel with some applications.Specs$35.95 -
Out of stock
Moose Offroad - Inner Clutch Cover Gasket - Kawasaki
Moose Offroad
$11.64Moose Offroad - M817496 - Inner Clutch Cover Gasket - KawasakiFeaturesMade in the USASpecsTypeClutch Co$11.64 -
Out of stock
Moose Offroad - Piston Kit - 43.46 mm - Fits 2018-2023 Yamaha YZ65
Moose Offroad
$127.95Moose Offroad - 09105957 - Piston Kit - 43.46 mm - YamahaFeaturesWrist pin is nitride-coated, providing a hardened, wear-resistant bearing surfaceCoated skirt ease break-in, decreasing wear and...$127.95 -
Out of stock
Moose Offroad - Valve and Spring Kit - KTM 250SX-F | 250XC-F | 250 XCF-W - Fits 2008-2012 KTM 250 SX-F/XC-F/XCF-W
Moose Offroad
$217.95Moose Offroad - 09262467 - Valve and Spring Kit - KTM 250SX-F | 250XC-F | 250 XCF-WFeaturesExtend the life of the valve train and intake components by as much as 4x over the OEM titanium partsValves...$217.95 -
Out of stock
Moose Offroad - Piston Kit - 71.96 mm - Beta
Moose Offroad
$154.95Moose Offroad - 09106023 - Piston Kit - 71.96 mm - BetaFeaturesWrist pin is nitride-coated, providing a hardened, wear-resistant bearing surfaceCoated skirt ease break-in, decreasing wear and aiding...$154.95
Dirt Bike Pistons, Top-End Kits and Engine Rebuild Parts
Every dirt bike engine needs a refresh eventually. Ride long enough and the piston wears, compression drops and the bike just doesn't pull like it used to. Staying on top of top-end maintenance keeps your bike making power and keeps a cheap rebuild from turning into an expensive one.
We carry pistons and complete top-end kits from Vertex, Wossner, ProX and Athena, full gasket sets from Cometic and Athena, plus valves, springs, cam chains, bearings, seals and crank kits for full rebuilds. Boyesen reed valves and engine covers add performance and protection on two-strokes and four-strokes alike.
While the engine is apart, refresh the rest: fresh air filters and carb parts from fuel and intake, oil filters and fluids from oils and chemicals, and repacking or a new pipe from dirt bike exhaust.
Engine parts are specific to make, model, year and sometimes bore size, so check fitment carefully before ordering. If you're not sure what your rebuild needs, send us your bike's details and we'll help put the parts list together.