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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Wossner - 8923DA - Piston Kit - 77.96 mm - Gas Gas | Husqvarna | KTM - Fits 2021-2025 Gas Gas EX/MC 250F, 2016-2022 Husqvarna FC 250, 2016-2022 KTM 250 SX-F/XC-F
Wossner
$224.00Wossner - 09106134 - Piston Kit - 77.96 mm - Gas Gas | Husqvarna | KTMFeaturesLightweight piston with a tight piston wall clearance for a quieter running engineSkirt coated for reduced friction and...$224.00 -
Wossner - 8873DA - Piston Kit - 94.95 mm - Gas Gas | Husqvarna | KTM
Wossner
$244.00Wossner - 09106125 - Piston Kit - 94.95 mm - Gas Gas | Husqvarna | KTMFeaturesLightweight piston with a tight piston wall clearance for a quieter running engineSkirt coated for reduced friction and...$244.00 -
Works Connection - 24-622 - Engine Plug - Black - Fits Kawasaki 2020-2024 KX250, 2020-2024 KX250XC, 2019-2024 KX450
Works Connection
$46.95Works Connection - 09500905 - Engine Plug - Black - KawasakiFeaturesSimple positive installation with an Allen wrenchSet of two plugs (unless noted) replaces the stock plugsPolished to a mirror...$46.95 -
Works Connection - 24-623 - Engine Plug - Green - Fits Kawasaki 2020-2024 KX250, 2020-2024 KX250XC, 2019-2024 KX450
Works Connection
$46.95Works Connection - 09500906 - Engine Plug - Green - KawasakiFeaturesSimple positive installation with an Allen wrenchSet of two plugs (unless noted) replaces the stock plugsPolished to a mirror...$46.95 -
Works Connection - 24-620 - Engine Plug - Blue - Fits Kawasaki 2020-2024 KX250, 2020-2024 KX250XC, 2019-2024 KX450
Works Connection
$46.95Works Connection - 09500903 - Engine Plug - Blue - KawasakiFeaturesSimple positive installation with an Allen wrenchSet of two plugs (unless noted) replaces the stock plugsPolished to a mirror finish...$46.95 -
Wossner - RIK95.00 - Piston Ring Set - 95.00 mm
Wossner
$48.50Wossner - 09120860 - Piston Ring Set - 95.00 mmFeaturesSpecsEngine Type4-Stroke$48.50 -
Wossner - 8587DC - Piston Kit - 77.97 mm - Honda
Wossner
$184.00Wossner - 09104940 - Piston Kit - 77.97 mm - HondaFeaturesLightweight piston with a tight piston wall clearance for a quieter running engineSkirt coated for reduced friction and improved break in...$184.00 -
Wossner - 8582DB - Piston Kit - 76.97 mm - Kawasaki | Suzuki - Fits 2004-2005 Kawasaki KX250F, 2004-2006 Suzuki RM-Z250
Wossner
$184.00Wossner - 09104936 - Piston Kit - 76.97 mm - Kawasaki | SuzukiFeaturesLightweight piston with a tight piston wall clearance for a quieter running engineSkirt coated for reduced friction and improved...$184.00 -
Wossner - 8581DB - Piston Kit - 88.97 mm - Beta | KTM - Fits 2005-2009 Beta 450 RR 4T, 2003-2007 KTM 450 EXC/XC-W Racing, 2003-2006 KTM 450 EXC-G Racing, 2003-2005 KTM 450 MXC-G Racing, 2008-2009 KTM 450 XC
Wossner
$204.00Wossner - 09104933 - Piston Kit - 88.97 mm - Beta | KTMFeaturesLightweight piston with a tight piston wall clearance for a quieter running engineSkirt coated for reduced friction and improved break...$204.00 -
Wossner - 8807DB - Piston Kit - 87.96 mm - Gas Gas | Husqvarna | KTM
Wossner
$214.00Wossner - 09104987 - Piston Kit - 87.96 mm - Gas Gas | Husqvarna | KTMFeaturesLightweight piston with a tight piston wall clearance for a quieter running engineSkirt coated for reduced friction and...$214.00 -
Wossner - 8781DB - Piston Kit - 76.97 mm - Suzuki
Wossner
$184.00Wossner - 09104984 - Piston Kit - 76.97 mm - SuzukiFeaturesLightweight piston with a tight piston wall clearance for a quieter running engineSkirt coated for reduced friction and improved break in...$184.00 -
Works Connection - 21-151 - Clutch Cover - Red
Works Connection
$34.95Works Connection - 17310691 - Clutch Cover - RedFeaturesMirror finish with engraved logoMade in the U.S.A.Specs$34.95 -
Works Connection - 21-152 - Clutch Cover - Black - Multiple Honda/Kawasaki Models
Works Connection
$34.95Works Connection - 17310692 - Clutch Cover - Black Features Mirror finish with engraved logo Made in the U.S.A. Specs Product Na$34.95 -
Works Connection - 21-153 - Clutch Cover - Green - Multiple Honda/Kawasaki Models
Works Connection
$34.95Works Connection - 17310693 - Clutch Cover - GreenFeaturesMirror finish with engraved logoMade in the U.S.A.Specs$34.95 -
Wossner - 8906DA - Piston Kit - 83.94 mm - Fits 2014-2018 Sherco SE-F/SE-FR/3.0i-FR 300
Wossner
$214.00Wossner - 09104998 - Piston Kit - 83.94 mm - ShercoFeaturesLightweight piston with a tight piston wall clearance for a quieter running engineSkirt coated for reduced friction and improved break in...$214.00 -
Wossner - 8807DC - Piston Kit - 87.97 mm - Gas Gas | Husqvarna | KTM
Wossner
$214.00Wossner - 09104988 - Piston Kit - 87.97 mm - Gas Gas | Husqvarna | KTMFeaturesLightweight piston with a tight piston wall clearance for a quieter running engineSkirt coated for reduced friction and...$214.00 -
Wossner - 8707DA - Piston Kit - 94.95 mm - Husaberg | KTM - Multiple Husqvarna/KTM Models
Wossner
$204.00Wossner - 09104969 - Piston Kit - 94.95 mm - Husaberg | KTMFeaturesLightweight piston with a tight piston wall clearance for a quieter running engineSkirt coated for reduced friction and improved...$204.00 -
Wossner - RSB6750 - Piston Ring - 67.50 mm
Wossner
$18.50Wossner - 09120730 - Piston Ring - 67.50 mmFeaturesSpecsBore Size Metric67.50 mm$18.50 -
Wossner - K7055DA-2 - Piston Kit - 73.68 mm - Polaris
Wossner
$264.00Wossner - 09106314 - Piston Kit - 73.68 mm - PolarisFeaturesKit includes piston, rings, wrist pin and pin locksSpecs$264.00 -
Wossner - K7066DA-2 - Piston Kit - 84.85 mm - Polaris
Wossner
$324.00Wossner - 09106324 - Piston Kit - 84.85 mm - PolarisFeaturesKit includes piston, rings, wrist pin and pin locksSpecs$324.00 -
Wossner - RSB7250 - Piston Ring - 72.50 mm
Wossner
$18.50Wossner - 09120736 - Piston Ring - 72.50 mmFeaturesSpecsBore Size Metric72.50 mm$18.50 -
Wossner - RSB6700 - Piston Ring - 67.00 mm
Wossner
$18.50Wossner - 09120729 - Piston Ring - 67.00 mmFeaturesSpecsBore Size Metric67.00 mm$18.50 -
Wossner - K7060DA-2 - Piston Kit - 81.86 mm - Ski Doo | Lynx
Wossner
$344.00Wossner - 09106346 - Piston Kit - 81.86 mm - Ski Doo | LynxFeaturesKit includes piston, rings, wrist pin and pin locksSpecs$344.00 -
Wossner - RST8500 - Piston Ring - 85.00 mm
Wossner
$18.50Wossner - 09120882 - Piston Ring - 85.00 mmFeaturesSpecsRiding StyleSnow$18.50 -
Wossner - RST7530 - Piston Ring - 75.30 mm
Wossner
$18.50Wossner - 09120909 - Piston Ring - 75.30 mmFeaturesSpecsUnitsEachRidin$18.50 -
Wossner - K7057DA-2 - Piston Kit - 71.88 mm - Yamaha
Wossner
$284.00Wossner - 09106351 - Piston Kit - 71.88 mm - YamahaFeaturesKit includes piston, rings, wrist pin and pin locksSpecs$284.00 -
Wossner - K7060D050-2 - Piston Kit - 82.36 mm - Ski Doo | Lynx
Wossner
$344.00Wossner - 09106347 - Piston Kit - 82.36 mm - Ski Doo | LynxFeaturesKit includes piston, rings, wrist pin and pin locksSpecs$344.00 -
Wossner - K7016DA-2 - Piston Kit - 74.36 mm - Polaris
Wossner
$264.00Wossner - 09106312 - Piston Kit - 74.36 mm - PolarisFeaturesKit includes piston, rings, wrist pin and pin locksSpecs$264.00 -
Wossner - K7040DA-2 - Piston Kit - 70.37 mm - Polaris
Wossner
$284.00Wossner - 09106308 - Piston Kit - 70.37 mm - PolarisFeaturesKit includes piston, rings, wrist pin and pin locksSpecs$284.00 -
Wossner - K7043DA-3 - Piston Kit - 71.87 mm - Polaris
Wossner
$426.00Wossner - 09106320 - Piston Kit - 71.87 mm - PolarisFeaturesKit includes piston, rings, wrist pin and pin locksSpecs$426.00 -
Wossner - K7054DA-2 - Piston Kit - 73.68 mm - Arctic Cat
Wossner
$344.00Wossner - 09106293 - Piston Kit - 73.68 mm - Arctic CatFeaturesKit includes piston, rings, wrist pin and pin locksSpecs$344.00 -
Wossner - RST7200 - Piston Ring - 72.00 mm
Wossner
$18.50Wossner - 09120881 - Piston Ring - 72.00 mmFeaturesSpecsRiding StyleSnow$18.50 -
Wossner - RST8600 - Piston Ring - 86.00 mm
Wossner
$18.50Wossner - 09120880 - Piston Ring - 86.00 mmFeaturesSpecsEngine Type2-Stroke$18.50 -
Wossner - K7017DA-2 - Piston Kit - 77.13 mm - Polaris
Wossner
$304.00Wossner - 09106313 - Piston Kit - 77.13 mm - PolarisFeaturesKit includes piston, rings, wrist pin and pin locksSpecs$304.00 -
Wossner - K7063D050-2 - Piston Kit - 72.38 mm - Polaris
Wossner
$284.00Wossner - 09106307 - Piston Kit - 72.38 mm - PolarisFeaturesKit includes piston, rings, wrist pin and pin locksSpecs$284.00 -
Wossner - K7011DA-2 - Piston Kit - 80.86 mm - Arctic Cat
Wossner
$284.00Wossner - 09106296 - Piston Kit - 80.86 mm - Arctic CatFeaturesKit includes piston, rings, wrist pin and pin locksSpecs$284.00 -
Wossner - 8147DC - Piston Kit - 46.97 mm - Gas Gas | Husqvarna | KTM
Wossner
$112.00Wossner - 09104849 - Piston Kit - 46.97 mm - Gas Gas | Husqvarna | KTMFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross...$112.00 -
Wossner - 8169DC - Piston Kit - 66.36 mm - Gas Gas | Husqvarna | KTM
Wossner
$152.00Wossner - 09104863 - Piston Kit - 66.36 mm - Gas Gas | Husqvarna | KTMFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross...$152.00 -
Wossner - 8160DB - Piston Kit - 53.96 mm - Yamaha
Wossner
$122.00Wossner - 09104854 - Piston Kit - 53.96 mm - YamahaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$122.00 -
Wossner - 8216DB - Piston Kit - 66.36 mm - Yamaha
Wossner
$152.00Wossner - 09104878 - Piston Kit - 66.36 mm - YamahaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$152.00
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.