Dirt Bike Engine
5140 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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Cylinder Works - 50007 - Cylinder - 88.00 mm - Husqvarna | KTM
Cylinder Works
$526.95Cylinder Works - 09310720 - Cylinder - 88.00 mm - Husqvarna | KTMFeaturesNickel Silicon Carbide plated for long lifeMade in the U.S.A.Big bore cylinders do not require machine work.Specs$526.95 -
Cylinder Works - 10010-K01 - Cylinder Kit - Standard Bore - 96.00 mm - Honda
Cylinder Works
$704.95Cylinder Works - 09310713 - Cylinder Kit - Standard Bore - 96.00 mm - HondaFeaturesCylinder kit includes matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel silicon...$704.95 -
Cylinder Works - 40004-K03 - Cylinder Kit - Standard Bore - 77.00 mm - Suzuki
Cylinder Works
$704.95Cylinder Works - 09310675 - Cylinder Kit - Standard Bore - 77.00 mm - SuzukiFeaturesCylinder kit includes matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel...$704.95 -
Cylinder Works - CH1003-K01 - Cylinder Head Kit - Fits Honda 2004-2007 CRF250R, 2004-2006 CRF250X
Cylinder Works
$622.60Cylinder Works - 09300129 - Cylinder Head Kit - HondaFeaturesInclude cam caps and cam cap boltsInclude C630 (nickel/aluminum/bronze) valve seats and guidesCompetition valve jobShortened valve guides...$622.60 -
Cylinder Works - 50006-K01 - Cylinder Kit - Standard Bore - 78.00 mm - Gas Gas | Husqvarna | KTM
Cylinder Works
$940.75Cylinder Works - 09310717 - Cylinder Kit - Standard Bore - 78.00 mm - Gas Gas | Husqvarna | KTMFeaturesCylinder kit includes matched Vertex pistons to ensure longevity, performance and reduced engine...$940.75 -
Cylinder Works - 20010-K02HC - Cylinder Kit - High Compression - 77.00 mm - Yamaha
Cylinder Works
$750.95Cylinder Works - 09310709 - Cylinder Kit - High Compression - 77.00 mm - YamahaFeaturesCylinder kit comes with matched Vertex pistons to ensure longevity, performance and reduced engine noiseKit...$750.95 -
Cylinder Works - 20010-K02 - Cylinder Kit - Standard Bore - 77.00 mm - Yamaha
Cylinder Works
$750.95Cylinder Works - 09310676 - Cylinder Kit - Standard Bore - 77.00 mm - YamahaFeaturesCylinder kit includes matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel...$750.95 -
Cylinder Works - 51006-K01 - Cylinder Kit - Big Bore - 81.00 mm - Gas Gas | Husqvarna | KTM
Cylinder Works
$1,037.95Cylinder Works - 09310719 - Cylinder Kit - Big Bore - 81.00 mm - Gas Gas | Husqvarna | KTMFeaturesCylinders have a nickel silicon carbide cylinder sleeveLook virtually identical to OEM cylindersKit...$1,037.95 -
Cylinder Works - 50006 - Cylinder - 78.00 mm - Gas Gas | Husqvarna | KTM
Cylinder Works
$538.95Cylinder Works - 09310716 - Cylinder - 78.00 mm - Gas Gas | Husqvarna | KTMFeaturesNickel silicon carbide-plated for long lifeMade in the U.S.A.Specs$538.95 -
Cylinder Works - 10007-K03 - Cylinder Kit - Standard Bore - 76.80 mm - Honda
Cylinder Works
$609.95Cylinder Works - 09310674 - Cylinder Kit - Standard Bore - 76.80 mm - HondaFeaturesCylinder kit includes matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel silicon...$609.95 -
Cylinder Works - CH1002-K01 - Cylinder Head Kit - Fits 2008 Honda CRF250R
Cylinder Works
$592.95Cylinder Works - 09300128 - Cylinder Head Kit - HondaFeaturesInclude cam caps and cam cap boltsInclude C630 (nickel/aluminum/bronze) valve seats and guidesCompetition valve jobShortened valve guides...$592.95 -
Cylinder Works - 50007-K03 - Cylinder Kit - Standard Bore - 88.00 mm - Husqvarna | KTM
Cylinder Works
$888.95Cylinder Works - 09310721 - Cylinder Kit - Standard Bore - 88.00 mm - Husqvarna | KTMFeaturesCylinder kit includes matched Vertex pistons to ensure longevity, performance and reduced engine...$888.95 -
Cylinder Works - 10010 - Cylinder - 96.00 mm - Honda
Cylinder Works
$421.95Cylinder Works - 09310712 - Cylinder - 96.00 mm - HondaFeaturesNickel silicon carbide-plated for long lifeMade in the U.S.A.Specs$421.95 -
Cylinder Works - 11010-K01 - Cylinder Kit - Big Bore - 99.00 mm - Honda
Cylinder Works
$886.95Cylinder Works - 09310715 - Cylinder Kit - Big Bore - 99.00 mm - HondaFeaturesCylinders have a nickel silicon carbide cylinder sleeveLook virtually identical to OEM cylindersKit includes cylinder,...$886.95 -
Cylinder Works - 30012-K02 - Cylinder Kit - Standard Bore - 77.00 mm - Kawasaki
Cylinder Works
$704.95Cylinder Works - 09310727 - Cylinder Kit - Standard Bore - 77.00 mm - KawasakiFeaturesCylinder kit includes matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel...$704.95 -
Cylinder Works - 51006-G01 - Gasket Kit - Big Bore - Gas Gas/Husqvarna/KTM
Cylinder Works
$158.95Cylinder Works - 09346005 - Gasket Kit - Big Bore - Gas Gas/Husqvarna/KTMFeaturesSpecsBore Size ImperialOversize$158.95 -
Cylinder Works - 50006-K01HC - Cylinder Kit - High Compression - 78.00 mm - Gas Gas | Husqvarna | KTM
Cylinder Works
$920.95Cylinder Works - 09310718 - Cylinder Kit - High Compression - 78.00 mm - Gas Gas | Husqvarna | KTMFeaturesCylinder kit comes with matched Vertex pistons to ensure longevity, performance and reduced...$920.95 -
Cylinder Works - 51007-G01 - Gasket Kit - Big Bore - Husqvarna/KTM
Cylinder Works
$135.95Cylinder Works - 09346006 - Gasket Kit - Big Bore - Husqvarna/KTMFeaturesSpecsBore Size ImperialOversize (+2.00$135.95 -
Boyesen - CC-07B - Clutch Cover - Black - Fits 2004-2009 Honda CRF250R
Boyesen
$95.95Boyesen - 09400442 - Clutch Cover - Black - HondaFeaturesLightweight factory clutch covers provide years of outstanding protection; guaranteed not to warpIndividually surfaced for a perfect,...$95.95 -
Moose Offroad - Shock Seal Head
Moose Offroad
$52.95Moose Offroad - 13140770 - Shock Seal HeadFeaturesAll have air bleed holes to help remove air from the oil reservoir during installationDouble-lip oil seal designed to keep out dirt and keeps...$52.95 -
Moose Offroad - Motor Oil Seals - 0.010" Metal Head Gasket - Honda
Moose Offroad
$28.47Moose Offroad - M822110 - Motor Oil Seals - 0.010" Metal Head Gasket - HondaFeaturesHigh-tech materials provide unmatched reliability and performanceRebuild the engine and transmission with total...$28.47 -
Moose Offroad - Motor Oil Seals - Suzuki
Moose Offroad
$30.68Moose Offroad - M822125 - Motor Oil Seals - SuzukiFeaturesHigh-tech materials provide unmatched reliability and performanceRebuild the engine and transmission with total confidence as each set is...$30.68 -
Moose Offroad - Case Saver - CRF150R
Moose Offroad
$23.95Moose Offroad - 09500112 - Case Saver - CRF150RFeaturesBetter looking and more sturdy than OEM plastic guardsEngraved logoMounting hardware includedMade in the U.S.A.Specs$23.95 -
Moose Offroad - Case Saver - RM125/250 - Fits 1997-2008 Suzuki RM125/250
Moose Offroad
$23.95Moose Offroad - 09500025 - Case Saver - RM125/250FeaturesBetter looking and more sturdy than OEM plastic guardsEngraved logoMounting hardware includedMade in the U.S.A.Specs$23.95 -
Moose Offroad - Case Saver - KXF/RMZ250 - Fits 2004-2016 Kawasaki KX250F, 2004-2006 Suzuki RM-Z250
Moose Offroad
$23.95Moose Offroad - 09500024 - Case Saver - KXF/RMZ250FeaturesBetter looking and more sturdy than OEM plastic guardsEngraved logoMounting hardware includedMade in the U.S.A.Specs$23.95 -
Moose Offroad - Case Saver - KX125 - Fits 2003-2005 Kawasaki KX125
Moose Offroad
$23.95Moose Offroad - 09500022 - Case Saver - KX125FeaturesBetter looking and more sturdy than OEM plastic guardsEngraved logoMounting hardware includedMade in the U.S.A.Specs$23.95 -
Moose Offroad - Case Saver - YZ250 - Fits Yamaha 2001-2017 YZ250, 2016-2017 YZ250X
Moose Offroad
$23.95Moose Offroad - 09500020 - Case Saver - YZ250FeaturesBetter looking and more sturdy than OEM plastic guardsEngraved logoMounting hardware includedMade in the U.S.A.Specs$23.95 -
Moose Offroad - Case Saver - YZ250F - Fits 2001-2013 Yamaha WR/YZ250F
Moose Offroad
$23.95Moose Offroad - 09500019 - Case Saver - YZ250FFeaturesBetter looking and more sturdy than OEM plastic guardsEngraved logoMounting hardware includedMade in the U.S.A.Specs$23.95 -
Moose Offroad - Case Saver - YZ125 - Fits 1995-2004 Yamaha YZ125
Moose Offroad
$23.95Moose Offroad - 09500018 - Case Saver - YZ125FeaturesBetter looking and more sturdy than OEM plastic guardsEngraved logoMounting hardware includedMade in the U.S.A.Specs$23.95 -
Moose Offroad - Case Saver - CR125R - Fits 1997-2007 Honda CR125R
Moose Offroad
$23.95Moose Offroad - 09500014 - Case Saver - CR125RFeaturesBetter looking and more sturdy than OEM plastic guardsEngraved logoMounting hardware includedMade in the U.S.A.Specs$23.95 -
Moose Offroad - Case Saver - CR250R - Fits 2002-2007 Honda CR250R
Moose Offroad
$23.95Moose Offroad - 09500016 - Case Saver - CR250RFeaturesBetter looking and more sturdy than OEM plastic guardsEngraved logoMounting hardware includedMade in the U.S.A.Specs$23.95 -
Moose Offroad - Crank Bearings and Seals - KTM - Multiple Honda/Husaberg/KTM Models
Moose Offroad
$75.95Moose Offroad - 09240223 - Crank Bearings and Seals - KTMFeaturesKit contains right and left crankshaft bearings; 2-stroke kit contains outer sealsSeals designed with a fluorocarbon lip to reduce dry...$75.95 -
Moose Offroad - Crank Bearings and Seals - Kawasaki/Suzuki - Fits 1986-2007 Honda CR125R, 2004-2006 Suzuki RM-Z250
Moose Offroad
$56.95Moose Offroad - 09240103 - Crank Bearings and Seals - Kawasaki/SuzukiFeaturesKit contains right and left crankshaft bearings; 2-stroke kit contains outer sealsSeals designed with a fluorocarbon lip...$56.95 -
Moose Offroad - Motor Gasket Kit with Seal - Honda
Moose Offroad
$112.56Moose Offroad - M811266 - Motor Gasket Kit with Seal - HondaFeaturesRebuild the engine and transmission with total confidence as each set is designed for durability and accurate fitOil seals are...$112.56 -
Moose Offroad - Crankcase Bearing and Seal Kit - Cobra/Kawasaki/Suzuki
Moose Offroad
$62.95Moose Offroad - A241006 - Crankcase Bearing and Seal Kit - Cobra/Kawasaki/SuzukiFeaturesKit contains right and left crankshaft bearings; 2-stroke kits contain outer sealsSeals designed with a...$62.95 -
Moose Offroad - Crankcase Bearing and Seal Kit - Yamaha
Moose Offroad
$94.95Moose Offroad - A241028 - Crankcase Bearing and Seal Kit - YamahaFeaturesKit contains right and left crankshaft bearings; 2-stroke kits contain outer sealsSeals designed with a fluorocarbon lip to...$94.95 -
Moose Offroad - Crankcase Bearing and Seal Kit - Kawasaki
Moose Offroad
$85.95Moose Offroad - A241010 - Crankcase Bearing and Seal Kit - KawasakiFeaturesKit contains right and left crankshaft bearings; 2-stroke kits contain outer sealsSeals designed with a fluorocarbon lip to...$85.95 -
Moose Offroad - Motor Gasket Kit with Oil Seal - Husqvarna/Gas Gas/KTM - Fits 2021-2023 Gas Gas MC 65, 2018-2023 Husqvarna TC 65, 2009-2023 KTM 65 SX, 2013-2014 KTM 65 SXS, 2009 KTM 65 XC
Moose Offroad
$113.30Moose Offroad - 09341908 - Motor Gasket Kit with Oil Seal - Husqvarna/Gas Gas/KTMFeaturesRebuild the engine and transmission with total confidence as each set is designed for durability and accurate...$113.30 -
Moose Offroad - Top End Gasket Kit - Kawasaki/Suzuki
Moose Offroad
$57.30Moose Offroad - M810585 - Top End Gasket Kit - Kawasaki/SuzukiFeaturesHigh-tech materials provide unmatched reliability and performanceRebuild the engine and transmission with total confidence as...$57.30 -
Moose Offroad - Inner Clutch Cover Gasket - Kawasaki/Suzuki
Moose Offroad
$10.29Moose Offroad - M817486 - Inner Clutch Cover Gasket - Kawasaki/SuzukiFeaturesMade in the USASpecsEngine Type$10.29
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.