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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Vertex - VTK22803B - Top End Piston Kit - 48.45 mm - Kawasaki KX85 - Fits 2001-2011 Kawasaki KX85
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$184.95Vertex - 09103082 - Top End Piston Kit - 48.45 mm - Kawasaki KX85FeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$184.95 -
Vertex - WR101-074 - Engine Rebuild Kit - Suzuki RMZ250 - Fits 2010-2012 Suzuki RM-Z250
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$1,211.95Vertex - 09031009 - 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 -
Vertex - WR101-087 - Engine Rebuild Kit - Yamaha YZ450F - Fits 2006-2009 Yamaha YZ450F
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$1,272.55Vertex - 09031022 - Engine Rebuild Kit - Yamaha YZ450FFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,272.55 -
Vertex - WR101-083 - Engine Rebuild Kit - Yamaha YZ250F - Fits 2003-2004 Yamaha YZ250F
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$1,157.95Vertex - 09031018 - Engine Rebuild Kit - Yamaha YZ250FFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,157.95 -
Vertex - WR101-085 - Engine Rebuild Kit - Yamaha YZ250F - Fits 2008-2013 Yamaha YZ250F
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$1,157.95Vertex - 09031020 - Engine Rebuild Kit - Yamaha YZ250FFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,157.95 -
Vertex - WR101-082 - Engine Rebuild Kit - Yamaha YZ250/X - Fits Yamaha 2003-2024 YZ250, 2016-2024 YZ250X
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$911.35Vertex - 09031017 - Engine Rebuild Kit - Yamaha YZ250/XFeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot...$911.35 -
Vertex - VTK22991A - Top End Piston Kit - 51.95 mm - KTM 105SX/XC - Fits 2004-2011 KTM 105 SX
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$217.95Vertex - 09103083 - Top End Piston Kit - 51.95 mm - KTM 105SX/XCFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$217.95 -
Vertex - WR101-081 - Engine Rebuild Kit - Yamaha YZ125/X - Fits Yamaha 2005-2021 YZ125, 2020-2022 YZ125X
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$774.85Vertex - 09031016 - Engine Rebuild Kit - Yamaha YZ125/XFeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot...$774.85 -
Vertex - WR101-056 - Engine Rebuild Kit - KTM SX85 - Fits 2003-2012 KTM 85 SX
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$737.95Vertex - 09030994 - Engine Rebuild Kit - KTM SX85FeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot Rods...$737.95 -
Vertex - WR101-052 - Engine Rebuild Kit - Kawasaki KX85 - Fits 2007-2013 Kawasaki KX85
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$618.95Vertex - 09030990 - Engine Rebuild Kit - Kawasaki KX85FeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot...$618.95 -
Vertex - WR101-039 - Engine Rebuild Kit - Kawasaki KX250F - Fits 2005 Suzuki RM-Z250, 2005 Kawasaki KX250F
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$1,092.95Vertex - 09030976 - Engine Rebuild Kit - Kawasaki KX250FFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit,...$1,092.95 -
Vertex - WR101-030 - Engine Rebuild Kit - Honda CRF450R - Fits 2010-2012 Honda CRF450R
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$1,132.95Vertex - 09030970 - Engine Rebuild Kit - Honda CRF450RFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,132.95 -
Vertex - WR101-026 - Engine Rebuild Kit - Honda CRF450R - Fits 2005 Honda CRF450R
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$1,132.95Vertex - 09030966 - Engine Rebuild Kit - Honda CRF450RFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,132.95 -
Vertex - WR101-022 - Engine Rebuild Kit - Honda CRF250R - Fits 2007 Honda CRF250R
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$1,092.95Vertex - 09030962 - Engine Rebuild Kit - Honda CRF250RFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,092.95 -
Vertex - WR101-024 - Engine Rebuild Kit - Honda CRF250R - Fits 2010-2013 Honda CRF250R
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$1,147.60Vertex - 09030964 - Engine Rebuild Kit - Honda CRF250RFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,147.60 -
Vertex - WR101-019 - Engine Rebuild Kit - Honda CRF250R - Fits 2004 Honda CRF250R
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$1,092.95Vertex - 09030959 - Engine Rebuild Kit - Honda CRF250RFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,092.95 -
Vertex - WR101-013 - Engine Rebuild Kit - Honda CR250R - Fits 1995-1996 Honda CR250R
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$828.95Vertex - 09030953 - 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...$828.95 -
Vertex - 611215 - Complete Gasket Set - Sea-Doo
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$217.95Vertex - 09342618 - Complete Gasket Set - Sea-DooFeaturesIncludes all head, base, intake, exhaust gaskets and O-rings or oil seals, plus crankshaft end seals and power valve gasketsMade in the...$217.95 -
Vertex - VTK22998B - Top End Piston Kit - 53.96 mm - Suzuki RM125 - Fits 2004-2007 Suzuki RM125
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$223.95Vertex - 09103120 - Top End Piston Kit - 53.96 mm - Suzuki RM125FeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$223.95 -
Vertex - WR101-017 - Engine Rebuild Kit - Honda CR500R - Fits 1989-2001 Honda CR500R
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$920.95Vertex - 09030957 - Engine Rebuild Kit - Honda CR500RFeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot...$920.95 -
Vertex - 610420 - Full Top End Gasket Kit - Kawasaki
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$219.00Vertex - 09346554 - Full Top End Gasket Kit - KawasakiFeaturesPerformance sets are designed for cylinder rebuild and piston replacementMade in the USASpecs$219.00 -
Vertex - WR00008 - Engine Rebuild Kit - Yamaha YZ250F - Fits 2016-2018 Yamaha YZ250F
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$1,132.95Vertex - 09031634 - Engine Rebuild Kit - Yamaha YZ250FFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,132.95 -
Vertex - 611421 - Complete Gasket Kit with Seals - Kawasaki
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$410.75Vertex - 09346565 - Complete Gasket Kit with Seals - KawasakiFeaturesKit contains all gaskets necessary for professional engine rebuilding, including high-performance oil sealsThe most complete...$410.75 -
Vertex - 610812 - Full Top End Gasket Kit - Polaris
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$94.12Vertex - 09346558 - Full Top End Gasket Kit - PolarisFeaturesPerformance sets are designed for cylinder rebuild and piston replacementMade in the USASpecs$94.12 -
Vertex - 611216 - Complete Gasket Kit with Seals - Sea Doo
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$239.70Vertex - 09346559 - Complete Gasket Kit with Seals - Sea DooFeaturesKit contains all gaskets necessary for professional engine rebuilding, including high-performance oil sealsThe most complete gasket...$239.70 -
Vertex - 610417 - Full Top End Gasket Kit - Kawasaki
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$170.28Vertex - 09346552 - Full Top End Gasket Kit - KawasakiFeaturesPerformance sets are designed for cylinder rebuild and piston replacementMade in the USASpecs$170.28 -
Vertex - 611813 - Complete Gasket Kit with Seals - Polaris
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$90.12Vertex - 09346569 - Complete Gasket Kit with Seals - PolarisFeaturesKit contains all gaskets necessary for professional engine rebuilding, including high-performance oil sealsThe most complete gasket...$90.12 -
Vertex - 610421 - Full Top End Gasket Kit - Kawasaki
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$219.00Vertex - 09346555 - Full Top End Gasket Kit - KawasakiFeaturesPerformance sets are designed for cylinder rebuild and piston replacementMade in the USASpecs$219.00 -
Vertex - 611411 - Complete Gasket Kit with Seals - Kawasaki
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$185.08Vertex - 09346561 - Complete Gasket Kit with Seals - KawasakiFeaturesKit contains all gaskets necessary for professional engine rebuilding, including high-performance oil sealsThe most complete...$185.08 -
Vertex - 610107 - Full Top End Gasket Kit - Yamaha
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$235.47Vertex - 09346545 - Full Top End Gasket Kit - YamahaFeaturesPerformance sets are designed for cylinder rebuild and piston replacementMade in the USASpecs$235.47 -
Vertex - 610607 - Full Top End Gasket Kit - Yamaha
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$113.22Vertex - 09346556 - Full Top End Gasket Kit - YamahaFeaturesPerformance sets are designed for cylinder rebuild and piston replacementMade in the USASpecs$113.22 -
Vertex - 625003 - Injector O-Ring Kit - Sea Doo
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$15.47Vertex - 09351134 - Injector O-Ring Kit - Sea DooFeaturesMade in the USASpecsProduct NameO-Ring$15.47 -
Vertex - 622205 - Oil Seal Kit - Sea Doo Jetboat
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$18.12Vertex - 09351112 - Oil Seal Kit - Sea Doo JetboatFeaturesDoes not include valve stem seals or mechanical water pump seals.Specs$18.12 -
Vertex - 622206 - Oil Seal Kit - Sea Doo
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$49.72Vertex - 09351113 - Oil Seal Kit - Sea DooFeaturesDoes not include valve stem seals or mechanical water pump seals.Specs$49.72 -
Vertex - 622401 - Oil Seal Kit - Kawasaki
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$29.67Vertex - 09351114 - Oil Seal Kit - KawasakiFeaturesDoes not include valve stem seals or mechanical water pump seals.Specs$29.67 -
Vertex - 622404 - Oil Seal Kit - Kawasaki
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$51.22Vertex - 09351115 - Oil Seal Kit - KawasakiFeaturesDoes not include valve stem seals or mechanical water pump seals.Specs$51.22 -
Vertex - 24187B - Piston Kit - 95.97 mm - Honda CRF450R/RX
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$262.95Vertex - 09104659 - Piston Kit - 95.97 mm - Honda CRF450R/RXFeaturesThe piston skirt is treated with a Molybdenum Disulphite coating for a faster break-in time and increased piston lifeForged replica...$262.95 -
Vertex - 622118 - Oil Seal Kit - Yamaha
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$26.53Vertex - 09351111 - Oil Seal Kit - YamahaFeaturesDoes not include valve stem seals or mechanical water pump seals.Specs$26.53 -
Vertex - 622117 - Oil Seal Kit - Yamaha WaveRunner
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$26.53Vertex - 09351110 - Oil Seal Kit - Yamaha WaveRunnerFeaturesDoes not include valve stem seals or mechanical water pump seals.Specs$26.53 -
Vertex - 24187A - Piston Kit - 95.96 mm - Honda CRF450R/RX - Fits 2017-2018 Honda CRF450R/RX
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$274.95Vertex - 09104658 - Piston Kit - 95.96 mm - Honda CRF450R/RXFeaturesThe piston skirt is treated with a Molybdenum Disulphite coating for a faster break-in time and increased piston lifeForged replica...$274.95
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.