Dirt Bike Engine
3553 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
Cylinder Works - 41004-G01 - Big Bore Gasket Kit - Suzuki
Cylinder Works
$68.95Cylinder Works - 09342151 - Big Bore Gasket Kit - SuzukiFeaturesCylinder kit includes matched Vertex pistons to ensure longevity, performance and reduced engine noiseNickel Silicon Carbide plated for...$68.95 -
Out of stock
Cylinder Works - 51001-K01 - Cylinder Kit - Big Bore - 90.00 mm - KTM
Cylinder Works
$982.95Cylinder Works - 09310410 - Cylinder Kit - Big Bore - 90.00 mm - KTMFeaturesCylinders have a nickel silicon carbide cylinder sleeveLook virtually identical to OEM cylindersKit includes cylinder,...$982.95 -
Out of stock
Boyesen - CC22B - Clutch Cover - Black - Suzuki
Boyesen
$95.95Boyesen - CC22B - Clutch Cover - Black - SuzukiFeaturesLightweight factory clutch covers provide years of outstanding protection; guaranteed not to warpIndividually surfaced for a perfect, leak-free...$95.95 -
Out of stock
Del West - DW-CRF150EV07ND - Exhaust Valve - No Dish - Honda CRF150R '07-'15
Del West
$171.95Del West - 09262221 - Exhaust Valve - No Dish - Honda CRF150R '07-'15FeaturesTitanium aluminide valves are designed to meet the most exacting requirementsSpecs$171.95 -
Out of stock
Del West - DW-CRF150R-IV07-ND - Intake Valve - No Dish - Honda CRF150R '07-'16
Del West
$171.95Del West - 09262219 - Intake Valve - No Dish - Honda CRF150R '07-'16FeaturesTitanium aluminide valves are designed to meet the most exacting requirementsSpecs$171.95 -
Out of stock
Del West - DW-CRF150RIV07 - Intake Valve - Honda CRF150R '07-'16 - Fits Honda 2007-2015 CRF150R, 2016 CRF150R
Del West
$171.95Del West - 09262217 - Intake Valve - Honda CRF150R '07-'16FeaturesTitanium aluminide valves are designed to meet the most exacting requirementsSpecs$171.95 -
Out of stock
Boyesen - SC-41AB - Ignition Cover - Black - Husaberg/Husqvarna/KTM - Multiple Husqvarna/KTM Models
Boyesen
$87.95Boyesen - 09401266 - Ignition Cover - Black - Husaberg/Husqvarna/KTMFeaturesSeals properly, guarding inside of engine from dirt and water and outlasts stock coversBoyesen Factory Covers are cast from...$87.95 -
Out of stock
Boyesen - CCG-44A - Clutch Cover Replacement Gasket - KTM
Boyesen
$7.00Boyesen - 09343125 - Clutch Cover Replacement Gasket - KTMFeaturesLightweight factory clutch covers provide years of outstanding protection; guaranteed not to warpIndividually surfaced for a perfect,...$7.00 -
Out of stock
Boyesen - CCG-41 - Clutch Cover Replacement Gasket - Husaberg/Husqvarna/KTM
Boyesen
$7.00Boyesen - 09343124 - Clutch Cover Replacement Gasket - Husaberg/Husqvarna/KTMFeaturesLightweight factory clutch covers provide years of outstanding protection; guaranteed not to warpIndividually...$7.00 -
Out of stock
Cometic - EC1416032AFM - Stator Cover Gasket - Fits 2009-2016 Honda CRF450R
Cometic
$19.95Cometic - 09344394 - Stator Cover Gasket - HondaFeaturesMagneto cover gaskets are made from EST (Extreme Sealing Technology) material instead of fiberSave service time as AFM will not stick to the...$19.95 -
Out of stock
Cometic - C7191 - Top End Gasket Kit - 66.5 mm - Fits 2002-2004 Honda CR250
Cometic
$54.95Cometic - 09344251 - Top End Gasket Kit - 66.5 mm - HondaFeaturesMLS head gaskets promote an even torque load across the gasket sealing surface, providing less bore distortion and better piston ring...$54.95 -
Out of stock
Boyesen - CC-41AB - Clutch Cover - Black - Gas Gas/Husqvarna/KTM - Multiple Husqvarna/KTM Models
Boyesen
$95.95Boyesen - 09401453 - Clutch Cover - Black - Gas Gas/Husqvarna/KTMFeaturesLightweight factory clutch covers provide years of outstanding protection; guaranteed not to warpIndividually surfaced for a...$95.95 -
Out of stock
Cometic - EC1081032AFM - Stator Cover Gasket - Fits 2006-2008 Kawasaki KX450F
Cometic
$16.95Cometic - 09344372 - Stator Cover Gasket - KawasakiFeaturesMagneto cover gaskets are made from EST (Extreme Sealing Technology) material instead of fiberSave service time as AFM will not stick to the...$16.95 -
Out of stock
Cometic - EX008042AM - Exhaust Gasket - Fits 1986-1991 Honda CR250
Cometic
$7.95Cometic - 09344515 - Exhaust Gasket - HondaFeatures4-stroke applications utilize a double-sided Viton® rubber-coated stainless steel gasket providing precise, high-temperature sealing capabilities in...$7.95 -
Out of stock
Del West - DW-H-RX03-S - Valve Spring Retainer - Intake/Exhaust - Fits Honda 2004-2007 CRF250R, 2008-2014 CRF250R, 2010-2014 CRF250R, 2004-2014 CRF250X
Del West
$71.95Del West - 09262475 - Valve Spring Retainer - Intake/Exhaust - HondaFeaturesMeets the demands of off-roadSpecsRi$71.95 -
Cylinder Works - 30009-1 - Cylinder - 48.50 mm - Fits 2006-2013 Kawasaki KX85
Cylinder Works
$543.95Cylinder Works - 09310580 - Cylinder - 48.50 mm - KawasakiFeaturesNickel silicon carbide-plated for long lifeMade in the U.S.A.Specs$543.95 -
Out of stock
Cometic - C7653 - Crank Seal Kit - Fits Honda 1983-1984 CR80, 1985 CR80, 1986-1991 CR80, 1992-2002 CR80/Expert, 2003-2007 CR85
Cometic
$21.95Cometic - 09344314 - Crank Seal KitFeaturesDomestically made sets include the correct amount of seals for one applicationMade in the U.S.A.Specs$21.95 -
Out of stock
Cylinder Works - CH1001-K01 - Cylinder Head Kit - Fits 2009 Honda CRF250R
Cylinder Works
$592.95Cylinder Works - 09300127 - Cylinder Head Kit - HondaFeaturesInclude cam caps and cam cap boltsInclude C630 (nickel/aluminum/bronze) valve seats and guidesCompetition valve jobShortened valve guides...$592.95 -
Out of stock
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 -
Out of stock
Boyesen - CC-17M - Clutch Cover - Magnesium - Kawasaki/Suzuki - Fits 2004-2008 Kawasaki KX250F, 2004-2006 Suzuki RM-Z250
Boyesen
$95.95Boyesen - 09400446 - Clutch Cover - Magnesium - Kawasaki/SuzukiFeaturesLightweight factory clutch covers provide years of outstanding protection; guaranteed not to warpIndividually surfaced for a...$95.95 -
Out of stock
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 -
Out of stock
Moose Offroad - Clutch Cylinder Guard - Fits 2000-2007 KTM (all except EXC/SX-F/XCF-W
Moose Offroad
$27.95Moose Offroad - 09500150 - Clutch Cylinder Guard - KTMFeaturesSpecialized applications guard hydraulic clutch cylinders and feature knockdown bars to keep your chain in checkTwo-stroke versions come...$27.95 -
Out of stock
Moose Offroad - Crank Bearings and Seals - Kawasaki
Moose Offroad
$70.95Moose Offroad - 09240007 - Crank Bearings and Seals - KawasakiFeaturesKit contains right and left crankshaft bearings; 2-stroke kit contains outer sealsSeals designed with a fluorocarbon lip to...$70.95 -
Out of stock
Moose Offroad - Valve Shim - 7.48 x 2.00 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261874 - Valve Shim - 7.48 x 2.00 - 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 Kit - 10.00 mm
Moose Offroad
$110.00Moose Offroad - 09261829 - Valve Shim Kit - 10.00 mmFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's tool...$110.00 -
Out of stock
Moose Offroad - Valve Shim Kit - 7.48 mm
Moose Offroad
$128.00Moose Offroad - 09261827 - Valve Shim Kit - 7.48 mmFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's tool...$128.00 -
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 - 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 - 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 - Valve Shim - 7.48 x 2.15 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261877 - Valve Shim - 7.48 x 2.15 - 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 - 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 - 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 - Valve Seal Kit - KTM 250SX-F/250XC-F/250EXC-F - Fits 2013-2018 KTM 250 EXC-F/SX-F/XC-F
Moose Offroad
$15.95Moose Offroad - 09262840 - Valve Seal Kit - KTM 250SX-F/250XC-F/250EXC-FFeaturesHigh-temperature Viton® and PTFE materialsImproved tolerance over OEM100% quality controlledKit includes one full set...$15.95 -
Out of stock
Moose Offroad - Exhaust Gasket Kit - Gas Gas/Suzuki/Yamaha - Multiple Gas Gas/Suzuki/Yamaha Models
Moose Offroad
MSRP: $8.21$8.13Moose Offroad - 09345280 - Exhaust Gasket Kit - Gas Gas/Suzuki/YamahaFeatures2-stroke kit includes O-rings, springs, washer and gasket (where applicable)4-stroke kit contains header gasketSpecsMSRP: $8.21$8.13 -
Out of stock
Moose Offroad - Complete Gasket Set with Oil Seals - Gas Gas/Husqvarna/KTM - Multiple Gas Gas/Husqvarna/KTM Models
Moose Offroad
$166.03Moose Offroad - 09346918 - Complete Gasket Set with Oil Seals - Gas Gas/Husqvarna/KTMFeaturesValve seals also includedIncludes formed rubber valve cover gasketsOil seals are genuine OEM replacement...$166.03 -
Out of stock
Moose Offroad - Valve Cover Gasket - Kawasaki
Moose Offroad
$21.00Moose Offroad - 09346175 - Valve Cover Gasket - KawasakiFeaturesMade in the USASpecsMaterialRubber$21.00 -
Out of stock
Moose Offroad - Valve and Spring Kit - Kawasaki KX250X | KX250F - Fits Kawasaki 2020-2023 KX250, 2020-2022 KX250
Moose Offroad
$196.95Moose Offroad - 09263371 - Valve and Spring Kit - Kawasaki KX250X | KX250FFeaturesExtend 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 CRF250R | CRF250RX - Fits 2018-2021 Honda CRF250R/RX
Moose Offroad
$196.95Moose Offroad - 09263373 - Valve and Spring Kit - Honda CRF250R | CRF250RXFeaturesExtend 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 CRF250RX | CRF250R - Fits 2018-2021 Honda CRF250R/RX
Moose Offroad
$196.95Moose Offroad - 09263374 - Valve and Spring Kit - Honda CRF250RX | CRF250RFeaturesExtend 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 - Cam Chain - 92RH2015 x 108 Links
Moose Offroad
$72.00Moose Offroad - 09251441 - Cam Chain - 92RH2015 x 108 LinksFeaturesLightweight and great durabilityFeatures precision solid bushings and shot-peened, providing maximum strengthMade to meet or exceed...$72.00
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.