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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Moose Offroad - Valve Shim - 7.48 x 3.25 - 5 pack
Moose Offroad
$9.95Moose Offroad - 09261899 - Valve Shim - 7.48 x 3.25 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$9.95 -
Moose Offroad - Valve Shim - 7.48 x 3.20 - 5 pack
Moose Offroad
$9.95Moose Offroad - 09261898 - Valve Shim - 7.48 x 3.20 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$9.95 -
Moose Offroad - Valve Shim - 7.48 x 3.15 - 5 pack
Moose Offroad
$9.95Moose Offroad - 09261897 - Valve Shim - 7.48 x 3.15 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$9.95 -
Moose Offroad - Valve Shim - 7.48 x 2.90 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261892 - Valve Shim - 7.48 x 2.90 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 7.48 x 2.80 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261890 - Valve Shim - 7.48 x 2.80 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Case Saver - RMZ250 - Fits Suzuki 2007-2018 RM-Z250, 2005-2017 RM-Z450
Moose Offroad
$27.95Moose Offroad - 09500520 - Case Saver - RMZ250FeaturesBetter looking and more sturdy than OEM plastic guardsEngraved logoMounting hardware includedMade in the U.S.A.Specs$27.95 -
Moose Offroad - Piston Kit - 44.45 mm - Kawasaki | Suzuki
Moose Offroad
$113.35Moose Offroad - 09102697 - Piston Kit - 44.45 mm - Kawasaki | SuzukiFeaturesWrist pin is nitride-coated, providing a hardened, wear-resistant bearing surfaceCoated skirt ease break-in, decreasing...$113.35 -
Moose Offroad - Valve and Spring Kit - Honda CRF250R - Fits 2010-2015 Honda CRF250R
Moose Offroad
$217.95Moose Offroad - 09262435 - Valve and Spring Kit - Honda CRF250RFeaturesExtend the life of the valve train and intake components by as much as 4x over the OEM titanium partsValves are designed to not...$217.95 -
Moose Offroad - Case Saver - KX450F - Fits 2006-2015 Kawasaki KX450F
Moose Offroad
$27.95Moose Offroad - 09500518 - Case Saver - KX450FFeaturesBetter looking and more sturdy than OEM plastic guardsEngraved logoMounting hardware includedMade in the U.S.A.Specs$27.95 -
Moose Offroad - Valve and Spring Kit - Honda CRF450X - Fits 2005-2017 Honda CRF450X
Moose Offroad
$196.95Moose Offroad - 09262438 - Valve and Spring Kit - Honda CRF450XFeaturesExtend 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 -
Moose Offroad - Valve and Spring Kit - Honda CRF250X | CRF250R - Fits Honda 2004-2007 CRF250R, 2008-2009 CRF250R, 2004-2017 CRF250X
Moose Offroad
$217.95Moose Offroad - 09262427 - Valve and Spring Kit - Honda CRF250X | CRF250RFeaturesExtend the life of the valve train and intake components by as much as 4x over the OEM titanium partsValves are...$217.95 -
Moose Offroad - Case Saver - CRF450R - Fits Honda 2005-2009 CRF450X, 2002-2007 CRF450R
Moose Offroad
$23.95Moose Offroad - 09500017 - Case Saver - CRF450RFeaturesBetter looking and more sturdy than OEM plastic guardsEngraved logoMounting hardware includedMade in the U.S.A.Specs$23.95 -
Moose Offroad - Valve and Spring Kit - KTM RFS Engines 400 cc - 560 cc
Moose Offroad
$196.95Moose Offroad - 09262463 - Valve and Spring Kit - KTM RFS Engines 400 cc - 560 ccFeaturesExtend the life of the valve train and intake components by as much as 4x over the OEM titanium partsValves...$196.95 -
Moose Offroad - Cylinder - 88.00 mm - Fits KTM 2013-2015 350 SX-F, 2013-2015 350 XC-F
Moose Offroad
$474.95Moose Offroad - 09310627 - Cylinder - 88.00 mm - KTMFeaturesExtremely durable low-friction bore surface allows for greater heat dissipationMade from cast aluminum; nickel silicon carbide...$474.95 -
Moose Offroad - Cylinder - 96.00 mm - Fits 2009-2015 Kawasaki KX450F
Moose Offroad
$402.95Moose Offroad - 09310625 - Cylinder - 96.00 mm - KawasakiFeaturesExtremely durable low-friction bore surface allows for greater heat dissipationMade from cast aluminum; nickel silicon carbide...$402.95 -
Moose Offroad - Crank Bearings and Seals - Fits Gas Gas 2005-2007 EC 200, 2003-2007 EC 250, 2003-2007 MC 250, 2003-2005 SM 250, 2003-2007 EC 300
Moose Offroad
$160.95Moose Offroad - 09240290 - Crank Bearings and Seals - Gas GasFeaturesKit contains right and left crankshaft bearings; 2-stroke kit contains outer sealsSeals designed with a fluorocarbon lip to reduce...$160.95 -
Moose Offroad - Clutch Cylinder Guard - Gas Gas/KTM/Husqvarna - Multiple Gas Gas/Husqvarna/KTM Models
Moose Offroad
$42.95Moose Offroad - 09500758 - Clutch Cylinder Guard - Gas Gas/KTM/HusqvarnaFeaturesSpecialized applications guard hydraulic clutch cylinders and feature knockdown bars to keep your chain in...$42.95 -
Moose Offroad - Motor Oil Seals - Yamaha
Moose Offroad
$32.32Moose Offroad - M822175 - Motor Oil Seals - YamahaFeaturesHigh-tech materials provide unmatched reliability and performanceRebuild the engine and transmission with total confidence as each set is...$32.32 -
Moose Offroad - Valve and Spring Kit - Yamaha YZ450FX | YZ450F - Fits 2014-2019 Yamaha YZ450F
Moose Offroad
$196.95Moose Offroad - 09262733 - Valve and Spring Kit - Yamaha YZ450FX | YZ450FFeaturesExtend the life of the valve train and intake components by as much as 4x over the OEM titanium partsValves are...$196.95 -
Moose Offroad - Complete Motor Gasket Kit - Husaberg/Husqvarna/KTM - Fits 2011-2014 Husqvarna TE 300, 2014-2016 Husqvarna TE 300, 2008-2016 KTM 300 XC, 2008-2016 KTM 300 XC-W, 2014-2016 KTM 300 XC-W Six Days
Moose Offroad
$80.32Moose Offroad - 09341687 - Complete Motor Gasket Kit - Husaberg/Husqvarna/KTMFeaturesHigh-tech materials provide unmatched reliability and performanceRebuild the engine and transmission with total...$80.32 -
Moose Offroad - Wrist Pin - KTM
Moose Offroad
MSRP: $13.95$11.71Moose Offroad - 09130184 - Wrist Pin - KTMFeaturesSpecsProduct NameWrist PinMSRP: $13.95$11.71 -
Moose Offroad - Valve Shim - 7.48 x 2.75 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261889 - Valve Shim - 7.48 x 2.75 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 7.48 x 2.50 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261884 - Valve Shim - 7.48 x 2.50 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 7.48 x 2.10 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261876 - Valve Shim - 7.48 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 -
Moose Offroad - Valve Shim - 7.48 x 1.95 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261873 - Valve Shim - 7.48 x 1.95 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 7.48 x 2.05 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261875 - Valve Shim - 7.48 x 2.05 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 7.48 x 1.85 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261871 - Valve Shim - 7.48 x 1.85 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 7.48 x 1.90 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261872 - Valve Shim - 7.48 x 1.90 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 7.48 x 1.80 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261870 - Valve Shim - 7.48 x 1.80 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 7.48 x 1.60 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261866 - Valve Shim - 7.48 x 1.60 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 7.48 x 1.75 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261869 - Valve Shim - 7.48 x 1.75 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 7.48 x 1.40 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261862 - Valve Shim - 7.48 x 1.40 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 7.48 x 1.50 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261864 - Valve Shim - 7.48 x 1.50 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 10.0 x 2.95 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261852 - Valve Shim - 10.0 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...$10.95 -
Moose Offroad - Valve Shim - 10.0 x 2.30 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261839 - Valve Shim - 10.0 x 2.30 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 10.0 x 2.55 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261844 - Valve Shim - 10.0 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...$10.95 -
Moose Offroad - Valve Shim - 10.0 x 3.15 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261856 - Valve Shim - 10.0 x 3.15 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Valve Shim - 10.0 x 2.65 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261846 - Valve Shim - 10.0 x 2.65 - 5 packFeaturesForged from 4140 cold rolled steel, not sinteredLaser-etched size on each shim for identificationA great addition to any mechanic's...$10.95 -
Moose Offroad - Motor Gasket Kit with Oil Seal - KTM SX-F, XC-F, XCF-W & More
Moose Offroad
$149.21Moose Offroad - 09341010 - Motor Gasket Kit with Oil Seal - KTMFeaturesRebuild the engine and transmission with total confidence as each set is designed for durability and accurate fitOil seals are...$149.21 -
Moose Offroad - Valve Shim - 10.0 x 2.00 - 5 pack
Moose Offroad
$10.95Moose Offroad - 09261833 - Valve Shim - 10.0 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
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.