Dirt Bike Engine
3557 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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Wossner - CS2055 - Crankshaft Assembly - Gas Gas | Husqvarna | KTM - Fits 2021-2023 Gas Gas MC 65, 2009-2023 KTM 65 SX, 2014-2023 Husqvarna TC 65
Wossner
$282.00Wossner - 09210913 - Crankshaft Assembly - Gas Gas | Husqvarna | KTMFeaturesStandard replacement crankshaft assembly unless notedSpecs$282.00 -
Prox - 01.1315.A - Piston Kit - 66.34 mm - Honda CR250R | Suzuki RM250
Prox
$139.95Prox - PX4420A - Piston Kit - 66.34 mm - Honda CR250R | Suzuki RM250FeaturesCast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely...$139.95 -
Prox - 28.1381-2 - Intake Valve - Fits 1981-2002 Honda XR200R
Prox
$22.95Prox - 09260676 - Intake Valve - HondaFeaturesConstructed to meet OEM specificationsAvailable in standard sizes onlyReplacement Part for OEM Number(s):14721437000Specs$22.95 -
Prox - 23.CBS61009 - Crank Bearing and Seal Kit - Gas Gas/Husqvarna/KTM - Fits 2021-2023 Gas Gas MC 65, 2017-2023 Husqvarna TC 65, 2009-2024 KTM 65 SX
Prox
$59.95Prox - 09240361 - Crank Bearing and Seal Kit - Gas Gas/Husqvarna/KTMFeaturesIncludes all necessary bearings/seals for a component’s replacementFor use with OEM or Pro-X crankshafts.Specs$59.95 -
Kibblewhite - 10-SB290 - Valve Seat - 29.00 mm OD x 21.00 mm ID x 9.50 mm H - Honda | Yamaha - Fits 2004-2009 Honda CRF250R, 2003-2009 Yamaha YZ450F, 2003-2016 Yamaha WR450F
Kibblewhite
$30.30Kibblewhite - 09261621 - Valve Seat - 29.00 mm OD x 21.00 mm ID x 9.50 mm H - Honda | YamahaFeaturesGive the seat excellent thermal characteristics as well as resistance to corrosion and wearThese...$30.30 -
La Sleeve - KA5351 - Cylinder Sleeve - 48.00 mm - Kawasaki KX80
LA Sleeve
MSRP: $134.95$117.95La Sleeve - KA5351 - Cylinder Sleeve - 48.00 mm - Kawasaki KX80FeaturesOutside diameter precision centerless groundQuality replacement cylinder sleeves give old cylinders new lifeCylinder resleeving...MSRP: $134.95$117.95 -
Cycle Performance Prod. - CPP/9072 - Exhaust Wrap Clamps - Black - 4 Pack
Cycle Performance Prod.
$10.95Cycle Performance Prod. - 18610947 - Exhaust Wrap Clamps - Black - 4 PackFeaturesAnti-slip ball bearing locking deviceMade in the U.S.A.Specs$10.95 -
Kyb - 120224600101 - Shock Piston O-Ring - Rear - 46 mm - Multiple Models
KYB
$1.95Kyb - 13140070 - Shock Piston O-Ring - Rear - 46 mmFeaturesSpecsColor/FinishBlack$1.95 -
Kyb - 110100000101 - Fork Bleed Bolt O-Ring - Front - Multiple Models
KYB
$0.95Kyb - 04130031 - Fork Bleed Bolt O-Ring - FrontFeaturesSpecsProduct NameO-Ring$0.95 -
Boyesen - CC-07AM - Clutch Cover - Magnesium - Fits 2010-2017 Honda CRF250R
Boyesen
$117.95Boyesen - 09400969 - Clutch Cover - Magnesium - HondaFeaturesLightweight factory clutch covers provide years of outstanding protection; guaranteed not to warpIndividually surfaced for a perfect,...$117.95 -
Wossner - 8149DA - Piston Kit - 55.44 mm - Fits 1980-1984 Honda CR125R
Wossner
$132.00Wossner - 09105553 - Piston Kit - 55.44 mm - HondaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$132.00 -
Vertex - 610200 - Full Top End Gasket Kit - Sea-Doo
Vertex
$54.30Vertex - PD810402 - Full Top End Gasket Kit - Sea-DooFeaturesPerformance sets are designed for cylinder rebuild and piston replacementMade in the USASpecs$54.30 -
Vertex - 22991A - Piston Kit - 51.95 mm - KTM 105 SX/XC - Fits KTM 2003-2021 85 SX, 2004-2016 105 SX
Vertex
$171.95Vertex - 09100984 - Piston Kit - 51.95 mm - KTM 105 SX/XCFeaturesPiston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston lifeGravity-cast...$171.95 -
Prox - 29.748170 - Valve Shims - 7.48 mm x 1.70 mm - 5 pack
Prox
$10.95Prox - 09260880 - Valve Shims - 7.48 mm x 1.70 mm - 5 packFeaturesPrecision machined to match exact sizeInexpensive and easy replacement for expensive OEM shimsSpecs$10.95 -
Prox - 29.748175 - Valve Shims - 7.48 mm x 1.75 mm - 5 pack
Prox
$10.95Prox - 09260881 - Valve Shims - 7.48 mm x 1.75 mm - 5 packFeaturesPrecision machined to match exact sizeInexpensive and easy replacement for expensive OEM shimsSpecs$10.95 -
Prox - 01.3220.A - Piston Kit - 53.94 mm - Suzuki RM125
Prox
$121.95Prox - PX5060A - Piston Kit - 53.94 mm - Suzuki RM125FeaturesCast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close...$121.95 -
La Sleeve - H5450 - Cylinder Sleeve - 54.00 mm - Honda CR125R
LA Sleeve
MSRP: $146.95$127.95La Sleeve - H5450 - Cylinder Sleeve - 54.00 mm - Honda CR125RFeaturesOutside diameter precision centerless groundQuality replacement cylinder sleeves give old cylinders new lifeCylinder resleeving...MSRP: $146.95$127.95 -
La Sleeve - FL5140 - Cylinder Sleeve - 47.50 mm - Suzuki RM80
LA Sleeve
MSRP: $134.95$117.95La Sleeve - FL5140 - Cylinder Sleeve - 47.50 mm - Suzuki RM80FeaturesOutside diameter precision centerless groundQuality replacement cylinder sleeves give old cylinders new lifeCylinder resleeving...MSRP: $134.95$117.95 -
Boyesen - SC01AB - Ignition Cover - Black - Honda CR125R
Boyesen
$87.95Boyesen - SC01AB - Ignition Cover - Black - Honda CR125RFeaturesSeals properly, guarding inside of engine from dirt and water and outlasts stock coversBoyesen Factory Covers are cast from the highest...$87.95 -
Wossner - N1007 - Top End Bearing - 14 mm x 18 mm x 17.2 mm - Fits 1985-1986 Honda CR125, 1979-2000 Kawasaki KX80, 2001-2025 Kawasaki KX85, 1995-2013 Kawasaki KX100
Wossner
$18.50Wossner - 09240448 - Top End Bearing - 14 mm x 18 mm x 17.2 mmFeaturesPrecision manufactured from quality materialsSpecs$18.50 -
Wossner - 8220DB - Piston Kit - 53.96 mm - Beta | Gas Gas | Husaberg | Husqvarna | KTM
Wossner
$122.00Wossner - 09104885 - Piston Kit - 53.96 mm - Beta | Gas Gas | Husaberg | Husqvarna | KTMFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt...$122.00 -
Wossner - 8216DC - Piston Kit - 66.37 mm - Yamaha
Wossner
$152.00Wossner - 09104879 - Piston Kit - 66.37 mm - YamahaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$152.00 -
Prox - 34.4419 - Gasket Kit - Complete - Fits 2009-2015 Kawasaki KX450F
Prox
$205.95Prox - 09345610 - Gasket Kit - Complete - KawasakiFeaturesSpecsEngine Type4-Stroke$205.95 -
Prox - 34.4339 - Gasket Kit - Complete - Fits 2009-2016 Kawasaki KX250F
Prox
$162.95Prox - 09345606 - Gasket Kit - Complete - KawasakiFeaturesSpecsTypeComplete$162.95 -
Athena - P400220850252 - Complete Gasket Kit - Husqvarna
Athena
$94.95Athena - 09341824 - Complete Gasket Kit - HusqvarnaFeaturesHead gasket features rubber-coated spring steel constructionSoft steel base gaskets are rubber coatedSteel core material features high...$94.95 -
Athena - P400270850019 - Complete Gasket Kit - KTM/Beta - Fits 2000-2007 KTM 400 EXC Racing/SX/XC-W
Athena
$150.95Athena - 09341819 - Complete Gasket Kit - KTM/BetaFeaturesHead gasket features rubber-coated spring steel constructionSoft steel base gaskets are rubber coatedSteel core material features high...$150.95 -
Athena - P400220600252 - Top End Gasket Kit - Husqvarna
Athena
$67.95Athena - 09341789 - Top End Gasket Kit - HusqvarnaFeaturesKit includes a top-of-the line MLSS head gasket and two or more premium quality base gaskets of different thicknesses to optimize engine...$67.95 -
Athena - S41316209 - Piston Ring Set
Athena
$35.95Athena - 09120434 - Piston Ring SetFeaturesSpecsEngine Type2-StrokePro$35.95 -
Cylinder Works - 20005-K02 - Cylinder Kit - Standard Bore - 97.00 mm - Yamaha
Cylinder Works
$804.95Cylinder Works - 09310585 - Cylinder Kit - Standard Bore - 97.00 mm - YamahaFeaturesCylinder kit includes matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel...$804.95 -
Cometic - C7116BE - Bottom End Gasket Kit with Oil Seals - Fits 1992-2001 Honda CR250
Cometic
$82.95Cometic - 09344234 - Bottom End Gasket Kit with Oil Seals - HondaFeaturesMaterials will vary depending on what is correct and engineered for specified applicationPurchase a top and a bottom end...$82.95 -
Cometic - C3322 - Bottom End Gasket Kit - Husqvarna
Cometic
$38.95Cometic - 09344143 - Bottom End Gasket Kit - HusqvarnaFeaturesMaterials will vary depending on what is correct and engineered for specified applicationPurchase a top and a bottom end gasket kit for a...$38.95 -
Cometic - C7010BE - Bottom End Gasket Kit with Oil Seals - Husqvarna
Cometic
$82.95Cometic - 09344221 - Bottom End Gasket Kit with Oil Seals - HusqvarnaFeaturesMaterials will vary depending on what is correct and engineered for specified applicationPurchase a top and a bottom end...$82.95 -
Moose Offroad - Case Saver Guard - RMZ450 - Fits 2008-2018 Suzuki RM-Z450
Moose Offroad
$37.95Moose Offroad - 09500379 - Case Saver Guard - RMZ450FeaturesOffers you the protection you're looking for like no otherThis slim design eliminates the bulky stock cover feel and offers more protection...$37.95 -
Moose Offroad - Inner Clutch Cover Gasket - Husaberg/Husqvarna/KTM
Moose Offroad
MSRP: $13.97$13.80Moose Offroad - 09346125 - Inner Clutch Cover Gasket - Husaberg/Husqvarna/KTMFeaturesMade in the USASpecsEngineMSRP: $13.97$13.80 -
Moose Offroad - Ring Set - For 77.00 mm Piston - Kawasaki | Suzuki | Yamaha
Moose Offroad
$35.95Moose Offroad - 09120241 - Ring Set - For 77.00 mm Piston - Kawasaki | Suzuki | YamahaFeaturesBe sure to use race fuel with some applications.Specs$35.95 -
Moose Offroad - Valve Cover Gasket - Yamaha YZ, WR & More
Moose Offroad
MSRP: $34.54$34.11Moose Offroad - 09346185 - Valve Cover Gasket - YamahaFeaturesMade in the USASpecsUnitsEachMSRP: $34.54$34.11 -
Wsm - 010-915-05 - Piston Rings - 76.50 mm - Sea-Doo
Wsm
$45.48Wsm - 01091505 - Piston Rings - 76.50 mm - Sea-DooFeaturesSpecsBore - Oversize Metric+0.50 mm$45.48 -
Wsm - 011-117 - Motor Mount - Yamaha
Wsm
$66.72Wsm - 011117 - Motor Mount - YamahaFeaturesReplacement Part for OEM Number(s):63M44517015B,6M644517005B,6M644517A000,6M644517A05B,6M644517A15B,6M644517A18P,6M644517A28PSpecs<$66.72 -
Wsm - 011-116 - Motor Mount - Yamaha
Wsm
$66.72Wsm - 011116 - Motor Mount - YamahaFeaturesReplacement Part for OEM Number(s):62E44517005B,62E44517A05B,62E44517A18P,63M44517015BSpecs$66.72 -
Wsm - 010-826-12 - Top-End Rebuild Kit - 84.50 mm - Original Series - Yamaha
Wsm
$250.31Wsm - 01082612 - Top-End Rebuild Kit - 84.50 mm - Original Series - YamahaFeaturesIncludes pistons, rings, pins, clips, racing needle bearings, head and base gaskets, intake and exhaust gasketsSpecs$250.31
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.