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 - 611209 - Complete Gasket Set - Sea-Doo
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$110.12Vertex - 09340514 - 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...$110.12 -
Vertex - 719116 - Exhaust Valve Gasket - Ski-Doo
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$31.97Vertex - 09340861 - Exhaust Valve Gasket - Ski-DooFeaturesContains exhaust valve gaskets, O-rings and seals where requiredSpecs$31.97 -
Vertex - 817838 - Exhaust Valve Bellow - Polaris
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$29.67Vertex - 09260303 - Exhaust Valve Bellow - PolarisFeaturesSpecsStyleFormed$29.67 -
Vertex - 817837 - Exhaust Valve Bellow - Polaris
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$28.58Vertex - 09260302 - Exhaust Valve Bellow - PolarisFeaturesSpecsApplicationExhaust$28.58 -
Vertex - 53010003950 - Piston Ring - 39.50 mm OD - For Replica Piston - Fits 2021 Gas Gas MC 50, 2017-2021 Husqvarna TC 50, 2001-2008 KTM 50 SX, 2009-2021 KTM 50 SX, 2020-2021 KTM 50 SX Mini
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$27.25Vertex - 09120346 - Piston Ring - 39.50 mm OD - For Replica PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$27.25 -
Vertex - 590281000001 - Piston Ring Set - 81.00 mm OD - For +3.00 mm Big Bore Piston
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$85.00Vertex - 09120309 - Piston Ring Set - 81.00 mm OD - For +3.00 mm Big Bore PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$85.00 -
Vertex - 590296000003 - Piston Ring
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$85.00Vertex - 09120342 - Piston RingFeaturesSpecsUnitsSetProduct Name<$85.00 -
Vertex - 53010005300 - Piston Ring - 53.00 mm OD - For Replica/Race/Big Bore Piston - Fits 2001-2011 Kawasaki KX85, 2002-2016 Suzuki RM85 Supermini
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$25.95Vertex - 09120344 - Piston Ring - 53.00 mm OD - For Replica/Race/Big Bore PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$25.95 -
Vertex - 590295000002 - Piston Ring Set - 95.00 mm OD - For Replica/High Compression/GP Racer's Choice Piston
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$62.95Vertex - 09120217 - Piston Ring Set - 95.00 mm OD - For Replica/High Compression/GP Racer's Choice PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending...$62.95 -
Vertex - 590296000001 - Piston Ring Set - 96.00 mm OD - For Replica and High Compression Piston
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$87.10Vertex - 09120219 - Piston Ring Set - 96.00 mm OD - For Replica and High Compression PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$87.10 -
Vertex - 53010005800 - Piston Ring - 58.00 mm OD - For Race and Big Bore Piston
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$31.45Vertex - 09120173 - Piston Ring - 58.00 mm OD - For Race and Big Bore PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs<$31.45 -
Vertex - 590278000002 - Piston Ring Set - 78.00 mm OD - For Replica and High Compression Piston
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$87.10Vertex - 09120213 - Piston Ring Set - 78.00 mm OD - For Replica and High Compression PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$87.10 -
Vertex - 590280000002 - Piston Ring Set - 80.00 mm OD - For +4.00 mm Big Bore Piston
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$104.95Vertex - 09120214 - Piston Ring Set - 80.00 mm OD - For +4.00 mm Big Bore PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$104.95 -
Vertex - 53010007200 - Piston Ring - 72.00 mm OD - For Replica Piston
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$48.25Vertex - 09120177 - Piston Ring - 72.00 mm OD - For Replica PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$48.25 -
Vertex - 55910005400 - Piston Ring - 54.00 mm OD - For Replica Piston
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$41.95Vertex - 09120203 - Piston Ring - 54.00 mm OD - For Replica PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$41.95 -
Vertex - 53010006640 - Piston Ring - 66.40 OD - For Replica Piston - Multiple Models
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$47.20Vertex - 09120175 - Piston Ring - 66.40 OD - For Replica PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$47.20 -
Vertex - 590276000001 - Piston Ring Set - 76.00 mm OD - For Replica and High Compression Piston
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$83.95Vertex - 09120209 - Piston Ring Set - 76.00 mm OD - For Replica and High Compression PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$83.95 -
Vertex - 53010006400 - Piston Ring - 64.00 mm OD - For Replica Piston - Fits KTM 1998-2004 200 SX, 1998-2014 200 EXC, 1998-2003 200 MXC, 2006-2009 200 XC
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$37.75Vertex - 09120174 - Piston Ring - 64.00 mm OD - For Replica PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$37.75 -
Vertex - 53010005200 - Piston Ring - 52.00 mm OD - For Replica/Stroker/Big Bore Piston - Fits 2003-2021 KTM 85 SX, 2004-2016 KTM 105 SX, 2002-2016 Suzuki RM85 Supermini
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$30.40Vertex - 09120169 - Piston Ring - 52.00 mm OD - For Replica/Stroker/Big Bore PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$30.40 -
Vertex - 53010004450 - Piston Ring - 44.50 mm OD - For Replica Piston - Fits 2000-2021 Kawasaki KX65, 2003-2006 Suzuki RM65
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$25.95Vertex - 09120164 - Piston Ring - 44.50 mm OD - For Replica PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$25.95 -
Vertex - 53010005400 - Piston Ring - 54.00 mm OD - For Replica and Race piston - Multiple Models
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$32.50Vertex - 09120170 - Piston Ring - 54.00 mm OD - For Replica and Race pistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$32.50 -
Vertex - 53010004500 - Piston Ring - 45.00 mm OD - For Replica Piston - Fits 2021 Gas Gas MC 65, 2017-2021 Husqvarna TC 65, 1997-2008 KTM 65 SX, 2009-2021 KTM 65 SX
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$28.30Vertex - 09120165 - Piston Ring - 45.00 mm OD - For Replica PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$28.30 -
Vertex - 53009804700 - Piston Ring - 47.00 mm OD - For Replica Piston
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$29.35Vertex - 09120163 - Piston Ring - 47.00 mm OD - For Replica PistonFeaturesNitride coated or chrome plated, increasing wear resistance and extending durabilitySpecs$29.35 -
Vertex - 810276 - Standard Bore Gasket Kit - Fits 2005-2017 Honda CRF450X
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$106.28Vertex - 09341934 - Standard Bore Gasket Kit - HondaFeaturesDesigned to replace OEM gaskets exactlyKit includes coated stainless steel head gasketsHigh-performance oil seals have a...$106.28 -
Vertex - VTK22521B - Top End Piston Kit - 66.36 mm - Kawasaki KX250 - Fits 1998-2001 Kawasaki KX250
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$289.95Vertex - 09103362 - Top End Piston Kit - 66.36 mm - Kawasaki KX250FeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$289.95 -
Vertex - VTK22795B-1 - Top End Piston Kit - 66.36 mm - Kawasaki KX250 - Fits 2004 Kawasaki KX250
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$289.95Vertex - 09103361 - Top End Piston Kit - 66.36 mm - Kawasaki KX250FeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$289.95 -
Vertex - VTK22795B - Top End Piston Kit - 66.36 mm - Kawasaki KX250 - Fits 2002-2003 Kawasaki KX250
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$289.95Vertex - 09103363 - Top End Piston Kit - 66.36 mm - Kawasaki KX250FeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$289.95 -
Vertex - 23943B - Piston Kit - 79.96 mm - Yamaha
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$302.95Vertex - 09103355 - Piston Kit - 79.96 mm - YamahaFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break in time and increased piston lifeIncreases...$302.95 -
Vertex - 23958B - Piston Kit - 96.94 mm - Yamaha
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$262.95Vertex - 09103397 - Piston Kit - 96.94 mm - YamahaFeaturesThe piston skirt is treated with a Molybdenum Disulphite coating for a faster break-in time and increased piston lifeForged replica piston is...$262.95 -
Vertex - 23958A - Piston Kit - 96.93 mm - Fits Yamaha 2014-2016 YZ450F, 2016-2018 WR450F
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$274.95Vertex - 09103396 - Piston Kit - 96.93 mm - YamahaFeaturesThe piston skirt is treated with a Molybdenum Disulphite coating for a faster break-in time and increased piston lifeForged replica piston is...$274.95 -
Vertex - VTK22806B - Top End Piston Kit - 53.94 mm - Yamaha YZ125 - Fits 2002-2004 Yamaha YZ125
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$208.95Vertex - 09103380 - Top End Piston Kit - 53.94 mm - Yamaha YZ125FeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$208.95 -
Vertex - VTK22652B - Top End Piston Kit - 53.96 mm - Suzuki RM125 - Fits 2000-2003 Suzuki RM125
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$223.95Vertex - 09103375 - 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 - 23375A - Piston Kit - 71.94 mm - Husqvarna | KTM - Fits 2014-2018 Husqvarna TE 300, 2004-2018 KTM 300 EXC/XC-W, 2006-2019 KTM 300 XC/XC-W
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$254.95Vertex - 09102421 - Piston Kit - 71.94 mm - Husqvarna | KTMFeaturesPiston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston lifeGravity-cast...$254.95 -
Vertex - 23375C - Piston Kit - 71.96 mm - Husqvarna | KTM
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$254.95Vertex - 09102422 - Piston Kit - 71.96 mm - Husqvarna | KTMFeaturesPiston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston lifeGravity-cast...$254.95 -
Vertex - VTK22499B-1 - Top End Piston Kit - 46.95 mm - Honda CR80R - Fits 1992-2002 Honda CR80R
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$164.95Vertex - 09103360 - Top End Piston Kit - 46.95 mm - Honda CR80RFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$164.95 -
Vertex - VTK22520B - Top End Piston Kit - 53.94 mm - Yamaha YZ125 - Fits 1998-2000 Yamaha YZ125
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$208.95Vertex - 09103379 - Top End Piston Kit - 53.94 mm - Yamaha YZ125FeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$208.95 -
Vertex - VTK22189B-1 - Top End Piston Kit - 53.94 mm - Honda CR125R - Fits 1998-1999 Honda CR125R
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$202.95Vertex - 09103358 - Top End Piston Kit - 53.94 mm - Honda CR125RFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston...$202.95 -
Vertex - 23757B - Piston Kit - 77.97 mm - Husaberg | Husqvarna | KTM
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$289.95Vertex - 09103179 - Piston Kit - 77.97 mm - Husaberg | Husqvarna | KTMFeaturesThe piston skirt is treated with a Molybdenum Disulphite coating for a faster break-in time and increased piston...$289.95 -
Vertex - 23867A - Piston Kit - 80.96 mm - Husaberg | Husqvarna | KTM - Fits 2014-2016 Husqvarna FE 250, 2014-2015 Husqvarna FC 250, 2013-2015 KTM 250 SX-F, 2013-2015 KTM 250 XC-F, 2014-2015 KTM 250 XCF-W
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$327.95Vertex - 09103334 - Piston Kit - 80.96 mm - Husaberg | Husqvarna | KTMFeaturesThe piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break in time and increased piston...$327.95 -
Vertex - 23870B - Piston Kit - 77.97 mm - Husaberg | Husqvarna | KTM
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$353.95Vertex - 09103338 - Piston Kit - 77.97 mm - Husaberg | Husqvarna | KTMFeaturesT-bridge design high compression piston with unique shot peened domeThe piston is heat-treated with a T-5 hardening and...$353.95
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.