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
Vertex - WR101-058 - Engine Rebuild Kit - Kawasaki | Suzuki - Fits 2000-2013 Suzuki DR-Z400, 2005-2009 Suzuki DR-Z400S, 2005-2009 Suzuki DR-Z400SM, 2003-2004 Kawasaki KLX400R
Vertex
$1,249.95Vertex - 09030996 - Engine Rebuild Kit - Kawasaki | SuzukiFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit,...$1,249.95 -
Out of stock
Vertex - WR101-047 - Engine Rebuild Kit - Kawasaki KX65 - Fits 2000-2001 Kawasaki KX65
Vertex
$592.95Vertex - 09030985 - Engine Rebuild Kit - Kawasaki KX65FeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot...$592.95 -
Out of stock
Vertex - WR101-065 - Engine Rebuild Kit - Suzuki RM250 - Fits 2006-2008 Suzuki RM250
Vertex
$920.95Vertex - 09031003 - Engine Rebuild Kit - Suzuki RM250FeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot...$920.95 -
Out of stock
Vertex - WR101-073 - Engine Rebuild Kit - Suzuki RMZ250 - Fits 2007-2009 Suzuki RM-Z250
Vertex
$1,211.95Vertex - 09031008 - Engine Rebuild Kit - Suzuki RMZ250FeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,211.95 -
Out of stock
Vertex - WR101-027 - Engine Rebuild Kit - Honda CRF450R - Fits 2006 Honda CRF450R
Vertex
$1,013.95Vertex - 09030967 - Engine Rebuild Kit - Honda CRF450RFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,013.95 -
Out of stock
Vertex - WR101-016 - Engine Rebuild Kit - Honda CR250R - Fits 2005-2007 Honda CR250R
Vertex
$867.95Vertex - 09030956 - Engine Rebuild Kit - Honda CR250RFeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot...$867.95 -
Out of stock
Vertex - WR101-044 - Engine Rebuild Kit - Kawasaki KX450F - Fits 2008 Kawasaki KX450F
Vertex
$1,211.95Vertex - 09030981 - Engine Rebuild Kit - Kawasaki KX450FFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit,...$1,211.95 -
Out of stock
Vertex - WR101-042 - Engine Rebuild Kit - Kawasaki KX250F - Fits 2010 Kawasaki KX250F
Vertex
$1,132.95Vertex - 09030979 - Engine Rebuild Kit - Kawasaki KX250FFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit,...$1,132.95 -
Out of stock
Vertex - 619127 - Carb Base Gasket - Keihin 38 mm
Vertex
$11.28Vertex - 09342624 - Carb Base Gasket - Keihin 38 mmFeaturesReplace worn or damaged base gaskets when doing a carb rebuildSpecs$11.28 -
Out of stock
Vertex - VTK23383B - Top End Piston Kit - 55.96 mm - KTM
Vertex
$256.95Vertex - 09103088 - Top End Piston Kit - 55.96 mm - KTMFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston lifeGravity-cast...$256.95 -
Out of stock
Vertex - WR101-063 - Engine Rebuild Kit - Suzuki RM250 - Fits 2003-2004 Suzuki RM250
Vertex
$946.95Vertex - 09031001 - Engine Rebuild Kit - Suzuki RM250FeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot...$946.95 -
Out of stock
Vertex - WR101-036 - Engine Rebuild Kit - Kawasaki KX125 - Fits 2003-2004 Kawasaki KX125
Vertex
$763.95Vertex - 09030973 - Engine Rebuild Kit - Kawasaki KX125FeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot...$763.95 -
Out of stock
Vertex - WR101-023 - Engine Rebuild Kit - Honda CRF250R - Fits 2008-2009 Honda CRF250R
Vertex
$1,105.60Vertex - 09030963 - Engine Rebuild Kit - Honda CRF250RFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,105.60 -
Out of stock
Vertex - WR101-045 - Engine Rebuild Kit - Kawasaki KX450F - Fits 2009 Kawasaki KX450F
Vertex
$1,211.95Vertex - 09030983 - Engine Rebuild Kit - Kawasaki KX450FFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit,...$1,211.95 -
Out of stock
Vertex - 619123 - Carb Base Gasket - Mikuni 38 mm
Vertex
$11.70Vertex - 09342620 - Carb Base Gasket - Mikuni 38 mmFeaturesReplace worn or damaged base gaskets when doing a carb rebuildSpecs$11.70 -
Out of stock
Vertex - VTK23133B - Top End Piston Kit - 66.35 mm - Honda CR250R - Fits 2005-2007 Honda CR250R
Vertex
$235.95Vertex - 09103024 - Top End Piston Kit - 66.35 mm - Honda CR250RFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$235.95 -
Out of stock
Vertex - VTK22926B - Top End Piston Kit - 63.95 mm - KTM 200EXC/MXC - Fits 1998-2002 KTM 200 EXC
Vertex
$262.95Vertex - 09103090 - Top End Piston Kit - 63.95 mm - KTM 200EXC/MXCFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$262.95 -
Out of stock
Vertex - 610211 - Full Top End Gasket Kit - Sea-Doo
Vertex
$127.08Vertex - 09342615 - Full Top End Gasket Kit - Sea-DooFeaturesPerformance sets are designed for cylinder rebuild and piston replacementMade in the USASpecs$127.08 -
Out of stock
Vertex - WR00002 - Engine Rebuild Kit - Fits KTM 2004-2005 300 EXC, 2006-2007 300 XC, 2006-2007 300 XC-W
Vertex
$1,052.95Vertex - 09031629 - Engine Rebuild Kit - KTMFeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot Rods main...$1,052.95 -
Out of stock
Vertex - WR00005 - Engine Rebuild Kit - Kawasaki | Suzuki - Fits 1985-2003 Kawasaki KX60, 2003 Suzuki RM60
Vertex
$564.95Vertex - 09031632 - Engine Rebuild Kit - Kawasaki | SuzukiFeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin...$564.95 -
Out of stock
Vertex - WR00003 - Engine Rebuild Kit - Fits KTM 2004-2005 50 SX Pro JR/SR, 2006-2008 50 SX
Vertex
$592.95Vertex - 09031630 - Engine Rebuild Kit - KTMFeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot Rods main...$592.95 -
Out of stock
Vertex - 590277000005 - Piston Rings - Kawasaki | Suzuki | Yamaha
Vertex
$81.95Vertex - 09120634 - Piston Rings - Kawasaki | Suzuki | YamahaFeaturesSpecsStyleForged Replica$81.95 -
Out of stock
Vertex - 610419 - Full Top End Gasket Kit - Kawasaki
Vertex
$311.17Vertex - 09346553 - Full Top End Gasket Kit - KawasakiFeaturesPerformance sets are designed for cylinder rebuild and piston replacementMade in the USASpecs$311.17 -
Out of stock
Vertex - 610409 - Full Top End Gasket Kit - Kawasaki
Vertex
$104.45Vertex - 09346551 - Full Top End Gasket Kit - KawasakiFeaturesPerformance sets are designed for cylinder rebuild and piston replacementMade in the USASpecs$104.45 -
Out of stock
Vertex - 611417 - Complete Gasket Kit with Seals - Kawasaki
Vertex
$373.45Vertex - 09346562 - Complete Gasket Kit with Seals - KawasakiFeaturesKit contains all gaskets necessary for professional engine rebuilding, including high-performance oil sealsThe most complete...$373.45 -
Out of stock
Vertex - 611605 - Complete Gasket Kit with Seals - Yamaha
Vertex
$103.88Vertex - 09346566 - Complete Gasket Kit with Seals - YamahaFeaturesKit contains all gaskets necessary for professional engine rebuilding, including high-performance oil sealsThe most complete gasket...$103.88 -
Out of stock
Vertex - 610607 - Full Top End Gasket Kit - Yamaha
Vertex
$113.22Vertex - 09346556 - Full Top End Gasket Kit - YamahaFeaturesPerformance sets are designed for cylinder rebuild and piston replacementMade in the USASpecs$113.22 -
Out of stock
Vertex - 24165A - Piston Kit - 76.95 mm - Kawasaki KX250F - Fits 2017 Kawasaki KX250F
Vertex
$124.95Vertex - 09104669 - Piston Kit - 76.95 mm - Kawasaki KX250FFeaturesThe piston skirt is treated with a Molybdenum Disulphite coating for a faster break-in time and increased piston lifeForged replica...$124.95 -
Out of stock
Vertex - 610102 - Full Top End Gasket Kit - Kawasaki
Vertex
$47.70Vertex - 09346544 - Full Top End Gasket Kit - KawasakiFeaturesPerformance sets are designed for cylinder rebuild and piston replacementMade in the USASpecs$47.70 -
Out of stock
Vertex - 24188B - Piston Kit - 95.97 mm - Honda CRF450R/RX
Vertex
$294.95Vertex - 09104663 - Piston Kit - 95.97 mm - Honda CRF450R/RXFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break in time and increased piston lifeForged...$294.95 -
Out of stock
Vertex - 710316 - Full Top End Gasket Kit - Polaris
Vertex
$106.12Vertex - 09347405 - Full Top End Gasket Kit - PolarisFeaturesA performance kit designed for cylinder rebuild and piston replacementMade in the USASpecs$106.12 -
Out of stock
Vertex - 710269 - Full Top End Gasket Kit - Yamaha
Vertex
$193.58Vertex - 09347403 - Full Top End Gasket Kit - YamahaFeaturesA performance kit designed for cylinder rebuild and piston replacementMade in the USASpecs$193.58 -
Out of stock
Vertex - 710267 - Full Top End Gasket Kit - Arctic Cat
Vertex
$88.88Vertex - 09347401 - Full Top End Gasket Kit - Arctic CatFeaturesA performance kit designed for cylinder rebuild and piston replacementMade in the USASpecs$88.88 -
Out of stock
Vertex - 710241 - Full Top End Gasket Kit - Yamaha
Vertex
$181.70Vertex - 09347393 - Full Top End Gasket Kit - YamahaFeaturesA performance kit designed for cylinder rebuild and piston replacementMade in the USASpecs$181.70 -
Out of stock
Vertex - 710223 - Full Top End Gasket Kit - Polaris
Vertex
$85.33Vertex - 09347388 - Full Top End Gasket Kit - PolarisFeaturesA performance kit designed for cylinder rebuild and piston replacementMade in the USASpecs$85.33 -
Out of stock
Vertex - 610216 - Full Top End Gasket Kit - Sea-Doo
Vertex
$186.12Vertex - 09346549 - Full Top End Gasket Kit - Sea-DooFeaturesPerformance sets are designed for cylinder rebuild and piston replacementMade in the USASpecs$186.12 -
Out of stock
Vertex - 625011 - Injector O-Ring Kit - Kawasaki
Vertex
$29.53Vertex - 09351141 - Injector O-Ring Kit - KawasakiFeaturesMade in the USASpecsApplicationFuel Injector<$29.53 -
Out of stock
Vertex - 55205 - Oil Seal - Ski-Doo
Vertex
$25.20Vertex - 09351250 - Oil Seal - Ski-DooFeaturesOil Seal for various makesSpecsUnitsEach$25.20 -
Out of stock
Vertex - 55114 - Oil Seal - Arctic Cat
Vertex
$10.08Vertex - 09351222 - Oil Seal - Arctic CatFeaturesEl Tigre 250 "Z" FA/2 ('75)El Tigre FA/2 [340cc] ('73-'74)El Tigre/Z FA/2 [440cc] ('73-'75)Twin 340 FA/2 ('73-'75)Twin 400 FA/2 ('73-'74)Drifter FC/2...$10.08 -
Out of stock
Vertex - 55204 - Oil Seal - Ski-Doo
Vertex
$29.28Vertex - 09351249 - Oil Seal - Ski-DooFeaturesOil Seal for various makesSpecsUnitsEach$29.28
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.