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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Out of stock
Wossner - 8250DA - Piston Kit - 71.94 mm - Husqvarna
Wossner
$192.00Wossner - 09104895 - Piston Kit - 71.94 mm - HusqvarnaFeaturesOptimized machining for lightness, as well as maintained strength in key areas such as crown and skirt wall cross sectionForged from...$192.00 -
Out of stock
Vertex - 710058 - Full Top End Set - Arctic Cat
Vertex
$34.88Vertex - 710058 - Full Top End Set - Arctic CatFeaturesFit most current and many non-current engines, including Sachs, JLO, Hirth, CCW, Kohler and XenoahDesigned to replace OEM gaskets exactlyMany...$34.88 -
Out of stock
Vertex - 719101 - Exhaust Valve Gasket - Arctic Cat
Vertex
$9.25Vertex - 09340848 - Exhaust Valve Gasket - Arctic CatFeaturesContains exhaust valve gaskets, O-rings and seals where requiredSpecs$9.25 -
Out of stock
Vertex - 717235 - Reed Cage Gasket - Yamaha
Vertex
$6.83Vertex - 09340838 - Reed Cage Gasket - YamahaFeaturesSpecsRiding StyleSnow$6.83 -
Out of stock
Vertex - 710209 - Full Top End Set - Polaris
Vertex
$85.33Vertex - 09340527 - Full Top End Set - PolarisFeaturesFit most current and many non-current engines, including Sachs, JLO, Hirth, CCW, Kohler and XenoahDesigned to replace OEM gaskets exactlyMany kit...$85.33 -
Out of stock
Vertex - 710203 - Full Top End Set - Ski-Doo
Vertex
$67.80Vertex - 09340523 - Full Top End Set - Ski-DooFeaturesFit most current and many non-current engines, including Sachs, JLO, Hirth, CCW, Kohler and XenoahDesigned to replace OEM gaskets exactlyMany kit...$67.80 -
Out of stock
Vertex - WR101-187 - Engine Rebuild Kit - Suzuki RM125 - Fits 2004-2007 Suzuki RM125
Vertex
$1,013.95Vertex - 09031439 - Engine Rebuild Kit - Suzuki RM125FeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot...$1,013.95 -
Out of stock
Vertex - 24238A - Piston Kit - 89.96 mm - Gas Gas | Husqvarna | KTM - Multiple Gas Gas/Husqvarna/KTM Models
Vertex
$327.95Vertex - 09105137 - Piston Kit - 89.96 mm - Gas Gas | Husqvarna | KTMFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break in time and increased piston...$327.95 -
Out of stock
Vertex - WR101-178 - Engine Rebuild Kit - Honda CRF150R/RB - Fits 2010-2024 Honda CRF150R/RB
Vertex
$911.35Vertex - 09031306 - Engine Rebuild Kit - Honda CRF150R/RBFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit,...$911.35 -
Out of stock
$24.95 -
Out of stock
Prox - 01.1208.A1 - Piston Kit - 53.94 mm - Honda CR125R
Prox
$105.95Prox - PX4240B - Piston Kit - 53.94 mm - Honda CR125RFeaturesCast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close...$105.95 -
Out of stock
Prox - 02.4106 - Ring Set
Prox
$24.95Prox - PX4230R - Ring SetFeaturesSpecsPiston MaterialAluminum AlloyRid$24.95 -
Out of stock
Prox - 02.1208 - Ring Set
Prox
$26.45Prox - PX4210R - Ring SetFeaturesSpecsPiston MaterialAluminum AlloyUni$26.45 -
Out of stock
Prox - 01.4221.A - Piston Kit - 53.96 mm - Kawasaki KX125
Prox
$105.95Prox - PX4221A - Piston Kit - 53.96 mm - Kawasaki KX125FeaturesCast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close...$105.95 -
Out of stock
Prox - 01.1408.025 - Piston Kit - 89.25 mm - Honda CR500R
Prox
$185.95Prox - PX4041 - Piston Kit - 89.25 mm - Honda CR500RFeaturesPrecision machined on state of the art CNC equipmentMade with low expansion, low friction alloyKit includes piston, rings, circlips and...$185.95 -
Out of stock
Prox - 01.2314.C - Piston Kit - 67.96 mm - Yamaha WR250/YZ250
Prox
$129.95Prox - PX7080C - Piston Kit - 67.96 mm - Yamaha WR250/YZ250FeaturesCast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely close...$129.95 -
Out of stock
Prox - 23.CBS34005 - Crank Bearing Kit - Fits 2005-2007 Suzuki RM-Z450
Prox
$109.95Prox - 09240346 - Crank Bearing Kit - SuzukiFeaturesIncludes all necessary bearings/seals for a component’s replacementFor use with OEM or Pro-X crankshafts.Specs$109.95 -
Out of stock
Prox - 28.SES2444-1 - Valve and Spring Kit - Exhaust - Fits 2014-2015 Yamaha YZ450F
Prox
$159.95Prox - 09262725 - Valve and Spring Kit - Exhaust - YamahaFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the extra...$159.95 -
Out of stock
Prox - 23.CBS23098 - Crank Bearing and Seal Kit - Fits 1998 Yamaha YZ250
Prox
$65.95Prox - 09240325 - Crank Bearing and Seal Kit - YamahaFeaturesIncludes all necessary bearings/seals for a component’s replacementFor use with OEM or Pro-X crankshafts.Specs$65.95 -
Out of stock
Prox - 28.SIS6353-2 - Valve and Spring Kit - Intake - Husaberg | Husqvarna | KTM - Fits Husqvarna 2013-2014 FE 350, 2014-2016 FE 350
Prox
$149.95Prox - 09262731 - Valve and Spring Kit - Intake - Husaberg | Husqvarna | KTMFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal...$149.95 -
Out of stock
Prox - 28.SIS6351-2 - Valve and Spring Kit - Intake - Husqvarna | KTM
Prox
$149.95Prox - 09262730 - Valve and Spring Kit - Intake - Husqvarna | KTMFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the...$149.95 -
Out of stock
Prox - 28.SES6353-1 - Valve and Spring Kit - Exhaust - Husaberg | Husqvarna | KTM - Fits Husqvarna 2013-2014 FE 350, 2014-2016 FE 350
Prox
$149.95Prox - 09262727 - Valve and Spring Kit - Exhaust - Husaberg | Husqvarna | KTMFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal...$149.95 -
Out of stock
Prox - 28.SES6351-1 - Valve and Spring Kit - Exhaust - Husqvarna | KTM
Prox
$149.95Prox - 09262726 - Valve and Spring Kit - Exhaust - Husqvarna | KTMFeaturesSteel, nitrided valves for increased durability and less wear under extreme conditionsStronger valve springs deal with the...$149.95 -
Out of stock
Rekluse - 751-04044 - RadiusCX Clutch Kit Replacement - Fits Kawasaki 2006-2020 KX450F, 2008-2021 KLX450R
Rekluse
$449.00Rekluse - 11313577 - RadiusCX Clutch Kit Replacement - KawasakiFeaturesIncludes TorqDrive friction disks, steel drive plates, EXP bases (two halves) and PTFE pads for wedge serviceAvailable for most...$449.00 -
Out of stock
Prox - 35.4429 - Top End Gasket Set - Fits 2019-2020 Kawasaki KX450
Prox
$59.95Prox - 09347140 - Top End Gasket Set - KawasakiFeaturesPrecision engineering and the use of first-class materials guarantee the quality you demandSpecs$59.95 -
Out of stock
Prox - 35.2448 - Top End Gasket Set - Fits Yamaha 2019-2020 WR450F, 2018-2019 YZ450F, 2019-2020 YZ450FX
Prox
$72.95Prox - 09347131 - Top End Gasket Set - YamahaFeaturesPrecision engineering and the use of first-class materials guarantee the quality you demandSpecs$72.95 -
Out of stock
Prox - 57.4315 - Water Pump Rebuild Kit - Fits Kawasaki 2005-2006 KDX200, 1997-2005 KDX220
Prox
$44.95Prox - 09347047 - Water Pump Rebuild Kit - KawasakiFeaturesRepair kit includes all necessary gaskets, O-rings, bearings and sealsSpecs$44.95 -
Out of stock
Prox - 01.6388.B - Piston Kit - 71.95 mm - Gas Gas | Husqvarna | KTM - Fits 2021-2024 Gas Gas EC/EX 300, 2018-2024 Husqvarna TE 300, 2019-2024 Husqvarna TX 300, 2018-2024 KTM 300 XC-W
Prox
$189.95Prox - 09106267 - Piston Kit - 71.95 mm - Gas Gas | Husqvarna | KTMFeaturesCast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely...$189.95 -
Out of stock
Prox - 01.6388.C - Piston Kit - 71.96 mm - Gas Gas | Husqvarna | KTM
Prox
$189.95Prox - 09106268 - Piston Kit - 71.96 mm - Gas Gas | Husqvarna | KTMFeaturesCast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to extremely...$189.95 -
Out of stock
Prox - 01.6387.B - Piston Kit - 71.95 mm - Husqvarna TE300/TX300 | KTM 300EXC - Fits 2017 Husqvarna TE 300, 2017-2018 Husqvarna TX 300, 2017 KTM 300 XC-W
Prox
$189.95Prox - 09106265 - Piston Kit - 71.95 mm - Husqvarna TE300/TX300 | KTM 300EXCFeaturesCast from a high-silicon-content aluminum alloy that meets or exceeds OEM specifications, then CNC-machined to...$189.95 -
Out of stock
Prox - 35.2424 - Top End Gasket Set - Fits Yamaha 2014-2017 YZ450F, 2016-2018 YZ450FX
Prox
$69.95Prox - 09347128 - Top End Gasket Set - YamahaFeaturesPrecision engineering and the use of first-class materials guarantee the quality you demandSpecs$69.95 -
Out of stock
Prox - 35.1419 - Top End Gasket Set - Fits Honda 2019-2025 CRF450L/RL, 2019-2020 CRF450R/RX, 2019-2025 CRF450X
Prox
$84.95Prox - 09347111 - Top End Gasket Set - HondaFeaturesPrecision engineering and the use of first-class materials guarantee the quality you demandSpecs$84.95 -
Out of stock
Prox - 57.6325 - Water Pump Rebuild Kit - Fits KTM 2005-2012 250 SX-F, 2007-2012 250 XC-F, 2007-2013 250 XCF-W
Prox
$24.95Prox - 09347078 - Water Pump Rebuild Kit - KTMFeaturesRepair kit includes all necessary gaskets, O-rings, bearings and sealsSpecs$24.95 -
Out of stock
Prox - 57.6429 - Water Pump Rebuild Kit - Fits KTM 2008-2011 450 XC-W, 2008-2009 530 EXC-R, 2009-2010 400 XC-W, 2009-2011 450 EXC, 2008 450 EXC-R
Prox
$49.95Prox - 09347081 - Water Pump Rebuild Kit - KTMFeaturesRepair kit includes all necessary gaskets, O-rings, bearings and sealsSpecs$49.95 -
Out of stock
Prox - 34.2418 - Gasket Kit - Complete - Yamaha
Prox
$139.95Prox - 09345561 - Gasket Kit - Complete - YamahaFeaturesSpecsRiding StyleOff-Road$139.95 -
Out of stock
Prox - 34.2221 - Gasket Kit - Complete - Fits 2001 Yamaha YZ125
Prox
$74.95Prox - 09345547 - Gasket Kit - Complete - YamahaFeaturesSpecsRiding StyleOff-Road$74.95 -
Out of stock
Prox - 34.1409 - Gasket Kit - Complete - Fits 1989-2001 Honda CR500R
Prox
$104.95Prox - 09345534 - Gasket Kit - Complete - HondaFeaturesSpecsRiding StyleOff-Road$104.95 -
Out of stock
Prox - 34.1422 - Gasket Kit - Complete - Fits 2002-2006 Honda CRF450R
Prox
$214.95Prox - 09345536 - Gasket Kit - Complete - HondaFeaturesSpecsUnitsKitRi$214.95 -
Out of stock
Prox - 34.1223 - Gasket Kit - Complete - Fits 2003 Honda CR125R
Prox
$104.95Prox - 09345521 - Gasket Kit - Complete - HondaFeaturesSpecsUnitsKitPr$104.95 -
Out of stock
Prox - 35.6327 - Top End Gasket Set - KTM/Husaberg/Husqvarna - Fits 2011-2014 Husqvarna TE 250, 2014-2016 Husqvarna TE 250, 2008-2016 KTM 250 XC-W, 2008-2016 KTM 250 XC
Prox
$44.05Prox - 09345790 - Top End Gasket Set - KTM/Husaberg/HusqvarnaFeaturesPrecision engineering and the use of first-class materials guarantee the quality you demandSpecs$44.05
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.