Dirt Bike Engine
4752 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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Hot Rods - K095 - Crankshaft Main Bearings and Seal - Fits Honda 2019-2020 CRF450L, 2017-2024 CRF450R/RX, 2019-2024 CRF450RWE
Hot Rods
$85.95Hot Rods - 09240599 - Crankshaft Main Bearings and Seal - HondaFeaturesQuality alternative to expensive OEM bearings and sealsSpecs$85.95 -
Kibblewhite - 80-82345 - Valve Guide Seals - Viton® - Fits 2019-2025 Yamaha YZ250F
Kibblewhite
$13.96Kibblewhite - 09263190 - Valve Guide Seals - Viton® - YamahaFeaturesMeet or exceed OEM specificationsMade in the USAWhen using Kibblewhite spring kits, Kibblewhite valve seals must be used because of...$13.96 -
Kibblewhite - 30-33430 - Cylinder Head Kit - C630 Valve Guides - Black Diamond™ Valves - Honda
Kibblewhite
$498.86Kibblewhite - 09263223 - Cylinder Head Kit - C630 Valve Guides - Black Diamond™ Valves - HondaFeaturesTop end gasket kit includes base gaskets, engine case gaskets, exhaust gaskets, head gaskets and...$498.86 -
Kibblewhite - 80-82316 - Valve - Exhaust - 25.00 mm - Standard - Yamaha
Kibblewhite
$31.01Kibblewhite - 09263179 - Valve - Exhaust - 25.00 mm - Standard - YamahaFeaturesLightweight, strong, one piece forging with profiles that provide excellent flow characteristicsValve is infused by a...$31.01 -
Kibblewhite - 80-82339 - Valve Guide - Exhaust - 0.3663" OD - Yamaha
Kibblewhite
$15.92Kibblewhite - 09263189 - Valve Guide - Exhaust - 0.3663" OD - YamahaFeaturesWith any battery operated or electric drill you can ream and hone manganese valve guides in less timeExpect the same...$15.92 -
Kibblewhite - 80-82312 - Valve - Intake - 31.00 mm - Standard - Fits 2019-2025 Yamaha YZ250F
Kibblewhite
$31.01Kibblewhite - 09263178 - Valve - Intake - 31.00 mm - Standard - YamahaFeaturesLightweight, strong, one piece forging with profiles that provide excellent flow characteristicsValve is infused by a...$31.01 -
Kibblewhite - 80-82312T - Valve - Intake - 31.00 mm - Yamaha
Kibblewhite
$92.51Kibblewhite - 09263180 - Valve - Intake - 31.00 mm - YamahaFeaturesFinished with a CrN PVD coating that has a low coefficient of friction, and is impact, abrasion, and corrosion resistantMade in the...$92.51 -
Kibblewhite - 80-82320 - Valve Guide - Intake - 0.3957" OD - Yamaha
Kibblewhite
$15.92Kibblewhite - 09263182 - Valve Guide - Intake - 0.3957" OD - YamahaFeaturesWith any battery operated or electric drill you can ream and hone manganese valve guides in less timeExpect the same...$15.92 -
Kibblewhite - 30-32822 - Valve Guide - Intake - 0.4380" OD - Honda
Kibblewhite
$30.95Kibblewhite - 09263149 - Valve Guide - Intake - 0.4380" OD - HondaFeaturesMade from copper based C63000 nickel-aluminum bronzeThe 5% nickel content provides superior resistance to wear, and the...$30.95 -
Kibblewhite - 80-82300 - Valve Spring Kit - 0.420" Intake Lift/0.400" Exhaust Lift - Lightweight Racing - Yamaha
Kibblewhite
$235.67Kibblewhite - 09263176 - Valve Spring Kit - 0.420" Intake Lift/0.400" Exhaust Lift - Lightweight Racing - YamahaFeaturesSpring kit comes complete for one motorKeepers are not includedMade in the U.S...$235.67 -
Kibblewhite - 71015-4 - Valve Guide Seals - Viton® - Honda | Kaswaki | Suzuki - Multiple Honda/Kawasaki/Suzuki Models
Kibblewhite
$13.96Kibblewhite - 09263164 - Valve Guide Seals - Viton® - Honda | Kaswaki | SuzukiFeaturesMeet or exceed OEM specificationsMade in the USAWhen using Kibblewhite spring kits, Kibblewhite valve seals must...$13.96 -
Kibblewhite - 60-60051H - Valve - Intake - 37.00 mm - Oversize - Suzuki
Kibblewhite
$31.01Kibblewhite - 09263142 - Valve - Intake - 37.00 mm - Oversize - SuzukiFeaturesElectroplated with a 360º anode, to produce an even coat of the highest grade hard chrome finishMade in the USASpecs$31.01 -
Kibblewhite - 71013-4 - Valve Guide Seals - Solid Viton® - Kawasaki
Kibblewhite
$13.96Kibblewhite - 09263166 - Valve Guide Seals - Solid Viton® - KawasakiFeaturesMade in the USAReplacement Part for OEM Number(s):12209KT7013Specs$13.96 -
Kibblewhite - 80-80912 - Valve - Intake - 31.00 mm - Standard - Fits 2014-2016 Yamaha WR/YZ250F
Kibblewhite
$31.01Kibblewhite - 09263162 - Valve - Intake - 31.00 mm - Standard - YamahaFeaturesLightweight, strong, one piece forging with profiles that provide excellent flow characteristicsValve is infused by a...$31.01 -
Kibblewhite - 80-81400 - Valve Spring Kit - 0.395" Intake Lift/0.370" Exhaust Lift - Lightweight Racing - Yamaha
Kibblewhite
$220.26Kibblewhite - 09263161 - Valve Spring Kit - 0.395" Intake Lift/0.370" Exhaust Lift - Lightweight Racing - YamahaFeaturesSpring kit comes complete for one motorKeepers are not includedMade in the U.S...$220.26 -
Kibblewhite - 40-41416H - Valve - Exhaust - 25.00 mm - Standard - Suzuki
Kibblewhite
$37.55Kibblewhite - 09263156 - Valve - Exhaust - 25.00 mm - Standard - SuzukiFeaturesElectroplated with a 360º anode, to produce an even coat of the highest grade hard chrome finishMade in the USASpecs$37.55 -
Kibblewhite - 40-41412H - Valve - Intake - 31.00 mm - Standard - Suzuki
Kibblewhite
$37.55Kibblewhite - 09263155 - Valve - Intake - 31.00 mm - Standard - SuzukiFeaturesElectroplated with a 360º anode, to produce an even coat of the highest grade hard chrome finishMade in the USASpecs$37.55 -
Kibblewhite - 30-32821 - Valve Guide - Intake - 0.4370" OD - Honda
Kibblewhite
$34.40Kibblewhite - 09263148 - Valve Guide - Intake - 0.4370" OD - HondaFeaturesMade from copper based C63000 nickel-aluminum bronzeThe 5% nickel content provides superior resistance to wear, and the...$34.40 -
Kibblewhite - 60-60273H - Valve - Exhaust - 29.00 mm - Standard - Suzuki
Kibblewhite
$31.01Kibblewhite - 09263146 - Valve - Exhaust - 29.00 mm - Standard - SuzukiFeaturesElectroplated with a 360º anode, to produce an even coat of the highest grade hard chrome finishMade in the USASpecs$31.01 -
Kibblewhite - 60-60271H - Valve - Intake - 37.00 mm - Oversize - Fits 2005-2006 Suzuki RM-Z450
Kibblewhite
$31.01Kibblewhite - 09263145 - Valve - Intake - 37.00 mm - Oversize - SuzukiFeaturesElectroplated with a 360º anode, to produce an even coat of the highest grade hard chrome finishMade in the USASpecs$31.01 -
Kibblewhite - 60-60054H - Vlave - Exhaust - 30.00 mm - Oversize - Suzuki
Kibblewhite
$31.01Kibblewhite - 09263144 - Vlave - Exhaust - 30.00 mm - Oversize - SuzukiFeaturesElectroplated with a 360º anode, to produce an even coat of the highest grade hard chrome finishMade in the USASpecs$31.01 -
Kibblewhite - 60-60053H - Valve - Exhaust - 29.00 mm - Standard - Suzuki
Kibblewhite
$31.01Kibblewhite - 09263143 - Valve - Exhaust - 29.00 mm - Standard - SuzukiFeaturesElectroplated with a 360º anode, to produce an even coat of the highest grade hard chrome finishMade in the USASpecs$31.01 -
Kibblewhite - 60-60050H - Valve - Intake - 36.00 mm - Standard - Suzuki
Kibblewhite
$31.01Kibblewhite - 09263141 - Valve - Intake - 36.00 mm - Standard - SuzukiFeaturesElectroplated with a 360º anode, to produce an even coat of the highest grade hard chrome finishMade in the USASpecs$31.01 -
Kibblewhite - 60-60516H - Valve - Exhaust - 25.00 mm - Standard - Suzuki
Kibblewhite
$37.55Kibblewhite - 09263140 - Valve - Exhaust - 25.00 mm - Standard - SuzukiFeaturesElectroplated with a 360º anode, to produce an even coat of the highest grade hard chrome finishMade in the USASpecs$37.55 -
Je Pistons - 130682 - Piston Kit - 100.00 mm - 11.25:1 CR - Honda
Je Pistons
$269.99Je Pistons - 09105834 - Piston Kit - 100.00 mm - 11.25:1 CR - HondaFeaturesMachined from 2618-T6 high tensile forged aluminumDomed, dished or flat top features smooth flowing radii; require no...$269.99 -
Kibblewhite - 30-33616T - Valve - Exhaust - 26.00 mm - Fits 1994-2002 Honda XR200R
Kibblewhite
$109.33Kibblewhite - 09263284 - Valve - Exhaust - 26.00 mm - HondaFeaturesFinished with a CrN PVD coating that has a low coefficient of friction, and is impact, abrasion, and corrosion resistantMade in the...$109.33 -
Kibblewhite - 30-33700 - Top End Kit - Black Diamond™ Valves with Piston Kit - Honda CRF250R/CRF250X - Fits Honda 2004-2007 CRF250R, 2004-2017 CRF250X
Kibblewhite
$706.21Kibblewhite - 09263289 - Top End Kit - Black Diamond™ Valves with Piston Kit - Honda CRF250R/CRF250XFeaturesPistons fully machined from 2618 aluminum alloy with a performance skirt coatingLightweight...$706.21 -
Je Pistons - 317240 - Piston Kit - 96.00 mm - 14.5:1 CR - Suzuki
Je Pistons
$329.99Je Pistons - 09105930 - Piston Kit - 96.00 mm - 14.5:1 CR - SuzukiFeaturesDedicated embossed forgings for weight reductionSpecialized processes such as internal milling the internal struts, along...$329.99 -
Je Pistons - 300275 - Piston Kit - 100.00 mm - 10.5:1 CR - Honda
Je Pistons
$269.99Je Pistons - 09105912 - Piston Kit - 100.00 mm - 10.5:1 CR - HondaFeaturesMachined from 2618-T6 high tensile forged aluminumDomed, dished or flat top features smooth flowing radii; require no...$269.99 -
Je Pistons - 284855 - Piston Kit - 96.00 mm - 12.8:1 CR - Kawasaki
Je Pistons
$329.99Je Pistons - 09105901 - Piston Kit - 96.00 mm - 12.8:1 CR - KawasakiFeaturesMachined from 2618-T6 high tensile forged aluminumDomed, dished or flat top features smooth flowing radii; require no...$329.99 -
Je Pistons - 284856 - Piston Kit - 96.00 mm - 13.5:1 CR - Kawasaki
Je Pistons
$329.99Je Pistons - 09105902 - Piston Kit - 96.00 mm - 13.5:1 CR - KawasakiFeaturesMachined from 2618-T6 high tensile forged aluminumDomed, dished or flat top features smooth flowing radii; require no...$329.99 -
Je Pistons - 262279 - Piston Kit - 66.00 mm - 12.5:1 CR - Fits 2007-2012 Honda CRF150R
Je Pistons
$325.99Je Pistons - 09105873 - Piston Kit - 66.00 mm - 12.5:1 CR - HondaFeaturesMachined from 2618-T6 high tensile forged aluminumDomed, dished or flat top features smooth flowing radii; require no...$325.99 -
Je Pistons - 274177 - Piston Kit - 77.00 mm - 13.0:1 CR - Honda
Je Pistons
$309.99Je Pistons - 09105878 - Piston Kit - 77.00 mm - 13.0:1 CR - HondaFeaturesMachined from 2618-T6 high tensile forged aluminumDomed, dished or flat top features smooth flowing radii; require no...$309.99 -
Je Pistons - 261966 - Piston Kit - 96.00 mm - 13.5:1 CR - Fits Honda 2002-2008 CRF450R, 2005-2017 CRF450X
Je Pistons
$329.99Je Pistons - 09105872 - Piston Kit - 96.00 mm - 13.5:1 CR - HondaFeaturesDedicated embossed forgings for weight reductionSpecialized processes such as internal milling the internal struts, along with...$329.99 -
Je Pistons - 128996 - Piston Kit - 101.00 mm - 10.6:1 CR - Fits 1985-2001 Honda XR600R
Je Pistons
$269.99Je Pistons - 09105832 - Piston Kit - 101.00 mm - 10.6:1 CR - HondaFeaturesMachined from 2618-T6 high tensile forged aluminumDomed, dished or flat top features smooth flowing radii; require no...$269.99 -
Je Pistons - 128998 - Piston Kit - 102.00 mm -10.8:1 CR - Honda
Je Pistons
$269.99Je Pistons - 09105833 - Piston Kit - 102.00 mm -10.8:1 CR - HondaFeaturesMachined from 2618-T6 high tensile forged aluminumDomed, dished or flat top features smooth flowing radii; require no...$269.99 -
Je Pistons - 391920 - Piston Kit - 78.00 mm - 14.5:1 CR - Fits 2023-2024 Kawasaki KX250
Je Pistons
$316.99Je Pistons - 09106680 - Piston Kit - 78.00 mm - 14.5:1 CR - KawasakiFeaturesMachined from 2618-T6 high tensile forged aluminumDomed, dished or flat top features smooth flowing radii; require no...$316.99 -
Je Pistons - 379938 - Piston Kit - 96.00 mm - 13.5:1 CR - Kawasaki
Je Pistons
$346.99Je Pistons - 09106679 - Piston Kit - 96.00 mm - 13.5:1 CR - KawasakiFeaturesMachined from 2618-T6 high tensile forged aluminumDomed, dished or flat top features smooth flowing radii; require no...$346.99 -
Kibblewhite - 30-33340 - Cylinder Head Kit - C674 Valve Guides - Black Diamond™ Valves - Honda
Kibblewhite
$440.64Kibblewhite - 09263120 - Cylinder Head Kit - C674 Valve Guides - Black Diamond™ Valves - HondaFeaturesTop end gasket kit includes base gaskets, engine case gaskets, exhaust gaskets, head gaskets and...$440.64 -
Kibblewhite - 30-33330 - Cylinder Head Kit - C630 Valve Guides - White Diamond® Valves - Honda
Kibblewhite
$562.23Kibblewhite - 09263119 - Cylinder Head Kit - C630 Valve Guides - White Diamond® Valves - HondaFeaturesTop end gasket kit includes base gaskets, engine case gaskets, exhaust gaskets, head gaskets and...$562.23
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.