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
Vertex - 23960B - Piston Kit - 96.95 mm - Yamaha YZ/WR450F
Vertex
$301.95Vertex - 09103403 - Piston Kit - 96.95 mm - Yamaha YZ/WR450FFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break in time and increased piston lifeForged...$301.95 -
Out of stock
Vertex - 24121C - Piston Kit - 76.78 mm - Honda CRF250R
Vertex
$265.95Vertex - 09104130 - Piston Kit - 76.78 mm - Honda CRF250RFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break in time and increased piston lifeForged...$265.95 -
Out of stock
Vertex - 24120C - Piston Kit - 76.78 mm - Honda CRF250R
Vertex
$138.95Vertex - 09104099 - Piston Kit - 76.78 mm - Honda CRF250RFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break in time and increased piston lifeForged...$138.95 -
Out of stock
Vertex - 24023B - Piston Kit - 76.96 mm - Kawasaki KX250F
Vertex
$301.95Vertex - 09103694 - Piston Kit - 76.96 mm - Kawasaki KX250FFeaturesT-bridge design high compression piston with unique shot peened domeThe piston is heat-treated with a T-5 hardening and tempering...$301.95 -
Out of stock
Vertex - VTKTC23561B - Top End Piston Kit - 76.77 mm - Honda CRF250R
Vertex
$296.95Vertex - 09103776 - Top End Piston Kit - 76.77 mm - Honda CRF250RFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$296.95 -
Out of stock
Vertex - VTKTC23856B - Top End Piston Kit - 95.96 mm - Honda CRF450R
Vertex
$342.95Vertex - 09103806 - Top End Piston Kit - 95.96 mm - Honda CRF450RFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$342.95 -
Out of stock
Vertex - 24119C - Piston Kit - 76.78 mm - Honda CRF250R
Vertex
$159.95Vertex - 09104085 - Piston Kit - 76.78 mm - Honda CRF250RFeaturesThe piston skirt is treated with a Molybdenum Disulphite coating for a faster break-in time and increased piston lifeForged replica...$159.95 -
Out of stock
Vertex - 23736B - Piston Kit - 76.96 mm - Suzuki RMZ250
Vertex
$290.95Vertex - 09102615 - Piston Kit - 76.96 mm - Suzuki RMZ250FeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break in time and increased piston lifeForged...$290.95 -
Out of stock
Vertex - 24268A - Piston Kit - 76.95 mm - Kawasaki KX250F
Vertex
$236.95Vertex - 09105178 - Piston Kit - 76.95 mm - Kawasaki KX250FFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break in time and increased piston lifeForged...$236.95 -
Out of stock
Vertex - VTK22499B - Top End Piston Kit - 46.95 mm - Honda CR80R
Vertex
$148.46Vertex - 09103359 - Top End Piston Kit - 46.95 mm - Honda CR80RFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$148.46 -
Out of stock
Vertex - WR00032 - Engine Rebuild Kit - KTM
Vertex
$1,052.95Vertex - 09031639 - Engine Rebuild Kit - KTMFeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot Rods main...$1,052.95 -
Out of stock
Vertex - 24188A - Piston Kit - 95.96 mm - Honda CRF450R/RX
Vertex
$327.95Vertex - 09104662 - Piston Kit - 95.96 mm - Honda CRF450R/RXFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break in time and increased piston lifeForged...$327.95 -
Out of stock
Vertex - 24189B - Piston Kit - 95.97 mm - Honda CRF450R/RX
Vertex
$322.95Vertex - 09104667 - Piston Kit - 95.97 mm - Honda CRF450R/RXFeaturesT-bridge design high compression piston with unique shot peened domeThe piston is heat-treated with a T-5 hardening and tempering...$322.95 -
Out of stock
Vertex - 24166A - Piston Kit - 76.95 mm - Kawasaki KX250F
Vertex
$212.95Vertex - 09104673 - Piston Kit - 76.95 mm - Kawasaki KX250FFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break in time and increased piston lifeForged...$212.95 -
Out of stock
Vertex - 50420004800 - Piston Ring - TM
Vertex
$25.95Vertex - 09120842 - Piston Ring - TMFeaturesSpecsDisplacement85 ccProd$25.95 -
Out of stock
Prox - 02.6228 - Piston Rings - 56.00 mm - KTM
Prox
$36.35Prox - 09120658 - Piston Rings - 56.00 mm - KTMFeaturesHigh quality rings which allow for optimum heat transfer and sealingCan be used in cast iron bores, nickel ceramic platings (Nikasil), boron...$36.35 -
Out of stock
Prox - 34.6248 - Gasket Kit - Complete - KTM
Prox
$96.10Prox - 09345621 - Gasket Kit - Complete - KTMFeaturesSpecsRiding StyleOff-Road$96.10 -
Out of stock
Prox - 57.6213 - Water Pump Rebuild Kit - KTM
Prox
$47.28Prox - 09347068 - Water Pump Rebuild Kit - KTMFeaturesRepair kit includes all necessary gaskets, O-rings, bearings and sealsSpecs$47.28 -
Out of stock
Prox - 35.3337 - Top End Gasket Set - Suzuki RM-Z 250
Prox
$69.95Prox - 09345737 - Top End Gasket Set - Suzuki RM-Z 250FeaturesPrecision engineering and the use of first-class materials guarantee the quality you demandSpecs$69.95 -
Out of stock
Kimpex - 294834 - Needle Bearing
Kimpex
$9.82Kimpex - NB1413 - Needle BearingFeaturesAll the raw material comes from Japan directlyHigh-purity Chromium Molybdenum alloy steel (JIS SCM415) with Carbon Nitriding heat-treatment processThe hardness...$9.82 -
Out of stock
La Sleeve - LAS-5611K-1 - Sleeve and Piston Kit - Kawasaki
LA Sleeve
$375.95La Sleeve - 09310519 - Sleeve and Piston Kit - KawasakiFeaturesFeature a Moly2000 centrifugally-spun, cast cylinder sleeved iron bore to provide better ring seal for better compression, more torque...$375.95 -
Out of stock
Hot Rods - 4516 - Crankshaft Assembly - Stroker - Yamaha
Hot Rods
$319.95Hot Rods - 09210519 - Crankshaft Assembly - Stroker - YamahaFeaturesDrop in replacement crankshaft requires no modification unless notedCNC machined and dynamically balanced to suit the increased...$319.95 -
Out of stock
Kibblewhite - 30-32839 - Valve Guide - Exhaust - 0.4460" OD - Honda
Kibblewhite
$30.95Kibblewhite - 09263153 - Valve Guide - Exhaust - 0.4460" OD - HondaFeaturesMade from copper based C63000 nickel-aluminum bronzeThe 5% nickel content provides superior resistance to wear, and the...$30.95 -
Out of stock
Kibblewhite - 30-32832 - Valve Guide - Exhaust - 0.4370" OD - Honda
Kibblewhite
$30.95Kibblewhite - 09263152 - Valve Guide - Exhaust - 0.4370" OD - HondaFeaturesMade from copper based C63000 nickel-aluminum bronzeThe 5% nickel content provides superior resistance to wear, and the...$30.95 -
Out of stock
Hot Rods - BBK0030 - Counter Balancer Bearing Kit - Honda
Hot Rods
$18.95Hot Rods - 09500909 - Counter Balancer Bearing Kit - HondaFeaturesIncludes trusted Hot Rods bearings for the counter balancer shaft of most modern 4-stroke enginesDoes not include water pump bearing...$18.95 -
Out of stock
Hot Cams - 2268-2IN - Camshaft - Intake - Stage 2 - Suzuki
Hot Cams
$263.95Hot Cams - 09250868 - Camshaft - Intake - Stage 2 - SuzukiFeaturesDesigned and dyno proven in the USAEngineered by utilizing state-of-the-art valvetrain softwareCNC machined from 8620 billet, case...$263.95 -
Out of stock
Hot Cams - 3015-1 - Camshaft - Single Cam - Stage 1 - KTM
Hot Cams
$289.95Hot Cams - KTM520S1A - Camshaft - Single Cam - Stage 1 - KTMFeaturesEngineered by using valvetrain softwareAdds a 5%-10% power gainCNC machined from 8620 billet, case hardened steel for an exact fit...$289.95 -
Out of stock
Hot Cams - 1009-1 - Camshaft - Single Cam - Stage 1 - Honda
Hot Cams
$391.95Hot Cams - XR650S1A - Camshaft - Single Cam - Stage 1 - HondaFeaturesEngineered by using valvetrain softwareAdds a 5%-10% power gainCNC machined from 8620 billet, case hardened steel for an exact fit...$391.95 -
Out of stock
Hot Cams - 4019-1 - Camshaft - Single Cam - Stage 1 - Yamaha
Hot Cams
$252.95Hot Cams - TTR125S1A - Camshaft - Single Cam - Stage 1 - YamahaFeaturesEngineered by using valvetrain softwareAdds a 5%-10% power gainCNC machined from 8620 billet, case hardened steel for an exact...$252.95 -
Out of stock
Hinson Racing - C494 - Clutch Cover - Fits 2010-2017 Honda CRF250R
Hinson Racing
$199.99Hinson Racing - 09400980 - Clutch Cover - HondaFeaturesStronger than stockPrecision machined from billet T-6 aircraft-quality aluminumRace provenHard-coated to resist boot wearMade in the USASpecs<$199.99 -
Out of stock
Hot Cams - 2116-2IN - Camshaft - Intake - Stage 2 - Kawasaki
Hot Cams
$289.95Hot Cams - 09250324 - Camshaft - Intake - Stage 2 - KawasakiFeaturesDesigned and dyno proven in the USAEngineered by utilizing state-of-the-art valvetrain softwareCNC machined from 8620 billet, case...$289.95 -
Out of stock
Hot Cams - HCSHIM31 - Valve Shim Kit - 10.00 mm O.D. - KTM
Hot Cams
$118.95Hot Cams - 09250726 - Valve Shim Kit - 10.00 mm O.D. - KTMFeaturesHeat treated for improved stength and longevityLaser etched size on each shimSpecs$118.95 -
Out of stock
Hot Cams - 1259-1 - Camshaft - Single Cam - Stage 1 - Honda
Hot Cams
$448.95Hot Cams - 09250843 - Camshaft - Single Cam - Stage 1 - HondaFeaturesEngineered by using valvetrain softwareAdds a 5%-10% power gainCNC machined from 8620 billet, case hardened steel for an exact fit...$448.95 -
Out of stock
Hinson Racing - C557-2101 - Clutch Cover - Fits 2021 Kawasaki KX250
Hinson Racing
$169.99Hinson Racing - 09402006 - Clutch Cover - KawasakiFeaturesStronger than stockPrecision machined from billet T-6 aircraft-quality aluminumRace provenHard-coated to resist boot wearMade in the USASpecs$169.99 -
Out of stock
Givi - TN5128 - Engine Guards - BMW - R 1250 GS - Fits 2019-2021 BMW R 1250 GS
GIVI
$385.00Givi - 05061511 - Engine Guards - BMW - R 1250 GSFeaturesRecommend fitting by a qualified mechanic.SpecsDiameter$385.00 -
Out of stock
Factory Links - LSA-T-001 - Shock Bearing Kit - Lower - Husaberg/KTM
Factory Links
MSRP: $52.00$34.95Factory Links - 13130229 - Shock Bearing Kit - Lower - Husaberg/KTMFeaturesSpecsTypeShockMSRP: $52.00$34.95 -
Out of stock
Athena - S4F090000050 - Piston Kit - 89.96 mm - Husqvarna | KTM - Multiple Husqvarna/KTM Models
Athena
$273.95Athena - 09102764 - Piston Kit - 89.96 mm - Husqvarna | KTMFeaturesHas been tested on engine dynamometer benches under progressive stress load, and thereafter on track to validate it performance even...$273.95 -
Out of stock
Athena - P400210850085 - Complete Gasket Kit - Honda
Athena
$55.95Athena - 400210850085 - Complete Gasket Kit - HondaFeaturesHead gasket features rubber-coated spring steel constructionSoft steel base gaskets are rubber coatedSteel core material features high...$55.95 -
Out of stock
Athena - P400210600126 - Top End Gasket Kit - Honda
Athena
$33.95Athena - 400210600126 - Top End Gasket Kit - HondaFeaturesKit includes a top-of-the line MLSS head gasket and two or more premium quality base gaskets of different thicknesses to optimize engine...$33.95 -
Out of stock
Athena - P400250600088/1 - Top End Gasket Kit - Kawasaki
Athena
$17.95Athena - 400250600088 - Top End Gasket Kit - KawasakiFeaturesKit includes a top-of-the line MLSS head gasket and two or more premium quality base gaskets of different thicknesses to optimize engine...$17.95
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.