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 - VTK23375B-1 - Top End Piston Kit - 71.95 mm - Fits 2005-2007 KTM 300 EXC
Vertex
$302.95Vertex - 09103107 - Top End Piston Kit - 71.95 mm - KTMFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston lifeGravity-cast...$302.95 -
Vertex - VTK22650B - Top End Piston Kit - 66.35 mm - KTM EXC250 - Fits 2000-2003 KTM 250 EXC
Vertex
$256.95Vertex - 09103095 - Top End Piston Kit - 66.35 mm - KTM EXC250FeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$256.95 -
Vertex - VTK22650B-2 - Top End Piston Kit - 66.35 mm - KTM EXC250 - Fits 2005 KTM 250 EXC
Vertex
$256.95Vertex - 09103093 - Top End Piston Kit - 66.35 mm - KTM EXC250FeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$256.95 -
Vertex - WR101-088 - Engine Rebuild Kit - Yamaha YZ450F - Fits 2010-2013 Yamaha YZ450F
Vertex
$1,249.95Vertex - 09031023 - Engine Rebuild Kit - Yamaha YZ450FFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,249.95 -
Vertex - WR101-068 - Engine Rebuild Kit - Suzuki RM85 - Fits 2002-2004 Suzuki RM85
Vertex
$618.95Vertex - 09031004 - Engine Rebuild Kit - Suzuki RM85FeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot...$618.95 -
Vertex - WR101-055 - Engine Rebuild Kit - Gas Gas | Husqvarna | KTM - Fits 2009-2023 KTM 65 SX, 2009 KTM 65 XC, 2017-2023 Husqvarna TC 65
Vertex
$802.15Vertex - 09030993 - Engine Rebuild Kit - Gas Gas | Husqvarna | KTMFeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin...$802.15 -
Vertex - WR101-076 - Engine Rebuild Kit - Suzuki RMZ450 - Fits 2008-2012 Suzuki RM-Z450
Vertex
$1,288.95Vertex - 09031011 - Engine Rebuild Kit - Suzuki RMZ450FeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,288.95 -
Vertex - WR101-012 - Engine Rebuild Kit - Honda CR250R - Fits 1992-1994 Honda CR250R
Vertex
$867.95Vertex - 09030982 - 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 -
Vertex - WR101-070 - Engine Rebuild Kit - Suzuki RMZ250 - Fits 2004 Suzuki RM-Z250
Vertex
$1,092.95Vertex - 09031006 - Engine Rebuild Kit - Suzuki RMZ250FeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,092.95 -
Vertex - WR101-050 - Engine Rebuild Kit - Kawasaki KX65 | Suzuki RM65 - Fits 2005 Kawasaki KX65, 2005 Suzuki RM65
Vertex
$564.95Vertex - 09030988 - Engine Rebuild Kit - Kawasaki KX65 | Suzuki RM65FeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin...$564.95 -
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 -
Vertex - WR101-041 - Engine Rebuild Kit - Kawasaki KX250F - Fits 2009 Kawasaki KX250F
Vertex
$1,183.95Vertex - 09030978 - Engine Rebuild Kit - Kawasaki KX250FFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit,...$1,183.95 -
Vertex - WR101-086 - Engine Rebuild Kit - Yamaha YZ450F - Fits 2003-2005 Yamaha YZ450F
Vertex
$1,183.95Vertex - 09031021 - Engine Rebuild Kit - Yamaha YZ450FFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,183.95 -
Vertex - WR101-089 - Engine Rebuild Kit - Yamaha YZ85 - Fits 2002-2014 Yamaha YZ85
Vertex
$564.95Vertex - 09031024 - Engine Rebuild Kit - Yamaha YZ85FeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot...$564.95 -
Vertex - WR101-054 - Engine Rebuild Kit - KTM SX65 - Fits 2003-2008 KTM 65 SX
Vertex
$711.95Vertex - 09030992 - Engine Rebuild Kit - KTM SX65FeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot Rods...$711.95 -
Vertex - WR101-025 - Engine Rebuild Kit - Honda CRF450R - Fits 2004 Honda CRF450R
Vertex
$1,132.95Vertex - 09030965 - 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 - WR101-018 - Engine Rebuild Kit - Honda CR85R/RB - Fits 2005-2007 Honda CR85R/RB
Vertex
$524.95Vertex - 09030958 - Engine Rebuild Kit - Honda CR85R/RBFeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin bearing)Hot...$524.95 -
Vertex - WR101-040 - Engine Rebuild Kit - Kawasaki KX250F - Fits 2006-2008 Kawasaki KX250F
Vertex
$1,092.95Vertex - 09030977 - 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 - WR101-014 - Engine Rebuild Kit - Honda CR250R - Fits 1997-2001 Honda CR250R
Vertex
$911.35Vertex - 09030954 - 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...$911.35 -
Vertex - WR101-020 - Engine Rebuild Kit - Honda CRF250R - Fits 2005 Honda CRF250R
Vertex
$1,052.95Vertex - 09030960 - Engine Rebuild Kit - Honda CRF250RFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$1,052.95 -
Vertex - VTK22860B - Top End Piston Kit - 44.45 mm - Kawasaki | Suzuki - Fits 2000-2021 Kawasaki KX65, 2003-2005 Suzuki RM65
Vertex
$184.95Vertex - 09103081 - Top End Piston Kit - 44.45 mm - Kawasaki | SuzukiFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$184.95 -
Vertex - 619128 - Carb Base Gasket - Keihin 40 mm
Vertex
$11.84Vertex - 09342625 - Carb Base Gasket - Keihin 40 mmFeaturesReplace worn or damaged base gaskets when doing a carb rebuildSpecs$11.84 -
Vertex - VTK22863B - Top End Piston Kit - 47.45 mm - Honda CR85R/RB - Fits Honda 2003-2004 CR85R, 2003-2004 CR85RB
Vertex
$150.95Vertex - 09103028 - Top End Piston Kit - 47.45 mm - Honda CR85R/RBFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$150.95 -
Vertex - VTK22995B - Top End Piston Kit - 53.93 mm - Honda CR125R - Fits 2004 Honda CR125R
Vertex
$197.95Vertex - 09103020 - Top End Piston Kit - 53.93 mm - Honda CR125RFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$197.95 -
Vertex - 619125 - Carb Base Gasket - Mikuni 44 mm
Vertex
$11.84Vertex - 09342622 - Carb Base Gasket - Mikuni 44 mmFeaturesReplace worn or damaged base gaskets when doing a carb rebuildSpecs$11.84 -
Vertex - 619126 - Carb Base Gasket - Mikuni 46 mm
Vertex
$11.84Vertex - 09342623 - Carb Base Gasket - Mikuni 46 mmFeaturesReplace worn or damaged base gaskets when doing a carb rebuildSpecs$11.84 -
Vertex - VTK23004B - Top End Piston Kit - 53.96 mm - Kawasaki KX125 - Fits 2003-2005 Kawasaki KX125
Vertex
$223.95Vertex - 09103073 - Top End Piston Kit - 53.96 mm - Kawasaki KX125FeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$223.95 -
Vertex - VTK22863B-1 - Top End Piston Kit - 47.45 mm - Honda CR85R/RB - Fits Honda 2005-2007 CR85R, 2005-2007 CR85RB
Vertex
$150.95Vertex - 09103027 - Top End Piston Kit - 47.45 mm - Honda CR85R/RBFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$150.95 -
Vertex - WR101-064 - Engine Rebuild Kit - Suzuki RM250 - Fits 2005 Suzuki RM250
Vertex
$920.95Vertex - 09031002 - 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 -
Vertex - 619124 - Carb Base Gasket - Mikuni 40 mm
Vertex
$11.84Vertex - 09342621 - Carb Base Gasket - Mikuni 40 mmFeaturesReplace worn or damaged base gaskets when doing a carb rebuildSpecs$11.84 -
Vertex - WR101-084 - Engine Rebuild Kit - Yamaha YZ250F - Fits 2005-2007 Yamaha YZ250F
Vertex
$1,157.95Vertex - 09031019 - 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 - WR101-049 - Engine Rebuild Kit - Kawasaki KX65 | Suzuki RM65 - Fits 2003-2004 Kawasaki KX65, 2003-2004 Suzuki RM65
Vertex
$592.95Vertex - 09030987 - Engine Rebuild Kit - Kawasaki KX65 | Suzuki RM65FeaturesVertex piston kit (standard compression piston, rings, pin and clips)Hot Rods heavy-duty crank (stock stroke with wrist pin...$592.95 -
Vertex - WR101-051 - Engine Rebuild Kit - Kawasaki KX65 - Fits 2006-2024 Kawasaki KX65
Vertex
$622.60Vertex - 09030989 - 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...$622.60 -
Vertex - WR101-046 - Engine Rebuild Kit - Kawasaki KX450F - Fits 2010-2012 Kawasaki KX450F
Vertex
$1,211.95Vertex - 09030984 - 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 -
Vertex - WR101-028 - Engine Rebuild Kit - Honda CRF450R - Fits 2007-2008 Honda CRF450R
Vertex
$985.95Vertex - 09030968 - Engine Rebuild Kit - Honda CRF450RFeaturesIncludes crankshaft, piston kit, complete engine gasket kit with oil seals, main bearings and seals, water pump rebuild kit, transmission...$985.95 -
Vertex - WR101-015 - Engine Rebuild Kit - Honda CR250R - Fits 2002-2004 Honda CR250R
Vertex
$870.40Vertex - 09030955 - 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...$870.40 -
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 -
Vertex - WR101-021 - Engine Rebuild Kit - Honda CRF250R - Fits 2006 Honda CRF250R
Vertex
$1,092.95Vertex - 09030961 - 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 - VTK22877B - Top End Piston Kit - 47.95 mm - Suzuki RM85/L - Fits 2002-2012 Suzuki RM85
Vertex
$164.95Vertex - 09103123 - Top End Piston Kit - 47.95 mm - Suzuki RM85/LFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$164.95 -
Vertex - VTK23429CD - Top End Piston Kit - 39.47 mm - Gas Gas | Husqvarna | KTM - Fits 2021 Gas Gas MC 50, 2017-2021 Husqvarna TC 50/Mini, 2009-2012 KTM 50 SX
Vertex
$137.95Vertex - 09103116 - Top End Piston Kit - 39.47 mm - Gas Gas | Husqvarna | KTMFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased...$137.95
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.