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
Wossner - 8020DB - Piston Kit - 53.96 mm - Honda
Wossner
$122.00Wossner - 09104723 - Piston Kit - 53.96 mm - HondaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$122.00 -
Out of stock
Wossner - 8020D050 - Piston Kit - 54.45 mm - Fits 1992-1999 Honda CR125R
Wossner
$122.00Wossner - 09104720 - Piston Kit - 54.45 mm - HondaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$122.00 -
Out of stock
Wossner - 8020DA - Piston Kit - 53.95 mm - Honda
Wossner
$122.00Wossner - 09104722 - Piston Kit - 53.95 mm - HondaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$122.00 -
Out of stock
Wossner - 8016DA - Piston Kit - 67.44 mm - Fits 1996-1999 KTM 250 SX
Wossner
$162.00Wossner - 09104709 - Piston Kit - 67.44 mm - KTMFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from aerospace...$162.00 -
Out of stock
Wossner - 8008DB - Piston Kit - 55.95 mm - Kawasaki KDX 125 - Fits 1990-2005 Kawasaki KDX125
Wossner
$142.00Wossner - 09104708 - Piston Kit - 55.95 mm - Kawasaki KDX 125FeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged...$142.00 -
Out of stock
Wossner - 8001DB - Piston Kit - 66.35 mm - Honda
Wossner
$152.00Wossner - 09104685 - Piston Kit - 66.35 mm - HondaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$152.00 -
Out of stock
Wossner - 8306DA - Piston Kit - 43.45 mm - Fits 2018-2026 Yamaha YZ65
Wossner
$112.00Wossner - 09105590 - Piston Kit - 43.45 mm - YamahaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$112.00 -
Out of stock
Wossner - 8299DA - Piston Kit - 57.95 mm - Husqvarna | KTM - Fits 2017-2025 Husqvarna TE 150, 2016-2022 KTM 150 SX, 2017-2019 KTM 150 XC-W
Wossner
$142.00Wossner - 09105589 - Piston Kit - 57.95 mm - Husqvarna | KTMFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged...$142.00 -
Out of stock
Wossner - 8233D050 - Piston Kit - 47.50 mm - Fits Yamaha 1986-1990 BW80, 1983-2006 PW80
Wossner
$112.00Wossner - 09105579 - Piston Kit - 47.50 mm - YamahaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$112.00 -
Out of stock
Wossner - 8210DA - Piston Kit - 55.94 mm - Fits 1982-1985 Kawasaki KX125
Wossner
$132.00Wossner - 09105577 - Piston Kit - 55.94 mm - KawasakiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$132.00 -
Out of stock
Wossner - 8197DA - Piston Kit - 47.95 mm - Fits 1988-2000 Kawasaki KX80
Wossner
$112.00Wossner - 09105572 - Piston Kit - 47.95 mm - KawasakiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$112.00 -
Out of stock
Wossner - 8201DA - Piston Kit - 47.95 mm - Fits Kawasaki 1983-1988 KDX80, 1984-1985 KX80
Wossner
$122.00Wossner - 09105574 - Piston Kit - 47.95 mm - KawasakiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$122.00 -
Out of stock
Wossner - 8168DB - Piston Kit - 66.35 mm - Fits 2005-2007 Kawasaki KX250
Wossner
$152.00Wossner - 09105566 - Piston Kit - 66.35 mm - KawasakiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$152.00 -
Out of stock
Wossner - 8161DB - Piston Kit - 66.35 mm - Honda
Wossner
$150.96Wossner - 09105564 - Piston Kit - 66.35 mm - HondaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$150.96 -
Out of stock
Wossner - 8175D100 - Piston Kit - 68.94 mm - Yamaha
Wossner
$152.00Wossner - 09105568 - Piston Kit - 68.94 mm - YamahaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$152.00 -
Out of stock
Wossner - 8161DC - Piston Kit - 66.36 mm - Honda
Wossner
$150.96Wossner - 09105565 - Piston Kit - 66.36 mm - HondaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$150.96 -
Out of stock
Wossner - 8151DA - Piston Kit - 55.94 mm - Fits Honda 1973-1978 CR125M Elsinore, 1974-1978 MT125
Wossner
$132.00Wossner - 09105554 - Piston Kit - 55.94 mm - HondaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$132.00 -
Out of stock
Wossner - 8140DA - Piston Kit - 66.34 mm - Fits 1998 Suzuki RM250
Wossner
$152.00Wossner - 09105552 - Piston Kit - 66.34 mm - SuzukiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$152.00 -
Out of stock
Wossner - 8130DA - Piston Kit - 55.94 mm - Fits 1988-1989 Kawasaki KX125
Wossner
$132.00Wossner - 09105546 - Piston Kit - 55.94 mm - KawasakiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$132.00 -
Out of stock
Wossner - 8134DA - Piston Kit - 67.94 mm - Yamaha
Wossner
$152.00Wossner - 09105551 - Piston Kit - 67.94 mm - YamahaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$152.00 -
Out of stock
Wossner - 8161DA - Piston Kit - 66.34 mm - Fits 1997-2001 Honda CR250R
Wossner
$150.96Wossner - 09105563 - Piston Kit - 66.34 mm - HondaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$150.96 -
Out of stock
Wossner - 8129DB - Piston Kit - 67.35 mm - Kawasaki
Wossner
$162.00Wossner - 09105545 - Piston Kit - 67.35 mm - KawasakiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$162.00 -
Out of stock
Wossner - 8124DA - Piston Kit - 53.94 mm - Fits 1981-1984 Suzuki RM125
Wossner
$132.00Wossner - 09105541 - Piston Kit - 53.94 mm - SuzukiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$132.00 -
Out of stock
Wossner - 8127DA - Piston Kit - 53.94 mm - Fits 1985-1986 Honda CR125R
Wossner
$132.00Wossner - 09105542 - Piston Kit - 53.94 mm - HondaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$132.00 -
Out of stock
Wossner - 8129DA - Piston Kit - 67.34 mm - Fits 1987-1989 Kawasaki KX250
Wossner
$162.00Wossner - 09105544 - Piston Kit - 67.34 mm - KawasakiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$162.00 -
Out of stock
Wossner - 8109DB - Piston Kit - 67.35 mm - Fits 1990-1991 Kawasaki KX250
Wossner
$152.00Wossner - 09105533 - Piston Kit - 67.35 mm - KawasakiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$152.00 -
Out of stock
Wossner - 8116DB - Piston Kit - 53.95 mm - Fits 1994-1996 Yamaha YZ125
Wossner
$122.00Wossner - 09105539 - Piston Kit - 53.95 mm - YamahaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$122.00 -
Out of stock
Wossner - 8118DA - Piston Kit - 55.94 mm - Fits 1986-1988 Yamaha YZ125
Wossner
$132.00Wossner - 09105540 - Piston Kit - 55.94 mm - YamahaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$132.00 -
Out of stock
Wossner - 8073DA - Piston Kit - 53.95 mm - Kawasaki
Wossner
$122.00Wossner - 09105503 - Piston Kit - 53.95 mm - KawasakiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$122.00 -
Out of stock
Wossner - 8057DA - Piston Kit - 53.95 mm - Fits 1999-2000 Kawasaki KX125
Wossner
$122.00Wossner - 09105493 - Piston Kit - 53.95 mm - KawasakiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$122.00 -
Out of stock
Wossner - 8062DA - Piston Kit - 53.95 mm - Fits 2001-2002 Kawasaki KX125
Wossner
$122.00Wossner - 09105498 - Piston Kit - 53.95 mm - KawasakiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$122.00 -
Out of stock
Wossner - 8059DC - Piston Kit - 66.36 mm - Suzuki
Wossner
$152.00Wossner - 09105497 - Piston Kit - 66.36 mm - SuzukiFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$152.00 -
Out of stock
Wossner - 8082DB - Piston Kit - 66.35 mm - Fits 2003-2004 KTM 250 SX
Wossner
$152.00Wossner - 09105507 - Piston Kit - 66.35 mm - KTMFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from aerospace...$152.00 -
Out of stock
Works Connection - 24-490 - Engine Plug - Blue - Honda CRF & More
Works Connection
$31.95Works Connection - 09500854 - Engine Plug - Blue - HondaFeaturesSimple positive installation with an Allen wrenchSet of two plugs replaces the stock plugsPolished to a mirror finish prior to...$31.95 -
Out of stock
Works Connection - 24-494 - Engine Plug - Black - Honda CRF & More
Works Connection
$31.95Works Connection - 09500856 - Engine Plug - Black - HondaFeaturesSimple positive installation with an Allen wrenchSet of two plugs replaces the stock plugsPolished to a mirror finish prior to...$31.95 -
Out of stock
Wossner - P2006 - Connecting Rod Kit - Fits KTM 2003-2012 85 SX, 2004-2011 105 SX
Wossner
$112.00Wossner - 09230570 - Connecting Rod Kit - KTMFeaturesShot peened for ultimate strength and long life8620 forged alloyFEA (computer simulation) used to fine tune every designGerman engineeredFor best...$112.00 -
Out of stock
Wossner - P2040 - Connecting Rod Kit - Honda | Suzuki - Fits 1981-1984 Honda CR125
Wossner
$122.00Wossner - 09230571 - Connecting Rod Kit - Honda | SuzukiFeaturesShot peened for ultimate strength and long life8620 forged alloyFEA (computer simulation) used to fine tune every designGerman...$122.00 -
Out of stock
Wossner - P4006 - Connecting Rod Kit - Fits 2001-2002 Yamaha YZ250F
Wossner
$174.00Wossner - 09230433 - Connecting Rod Kit - YamahaFeaturesDesigned to fit OEM bearing and crank pinGerman engineeredFour stroke rods include bronze-bushed small end for reduced friction and improved...$174.00 -
Out of stock
Wossner - P4004 - Connecting Rod Kit - Fits 2007-2025 Suzuki RM-Z250
Wossner
$174.00Wossner - 09230431 - Connecting Rod Kit - SuzukiFeaturesDesigned to fit OEM bearing and crank pinGerman engineeredFour stroke rods include bronze-bushed small end for reduced friction and improved...$174.00 -
Out of stock
Wsm - 010-960-07 - Piston Rings - 100.96 mm - Sea-Doo
Wsm
$57.94Wsm - 09120958 - Piston Rings - 100.96 mm - Sea-DooFeaturesSpecsBore Size Metric100.96 mm$57.94
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.