Dirt Bike Engine
Dirt Bike Engine Parts at JJ Motorsports
Discover a full range of dirt bike engine components for rebuilding or upgrading your performance from JJ Motorsports. From crankshafts to cylinder heads and piston kits, these precision-engineered components ensure reliable performance. For additional upgrades, check out our full selection of off-road dirt bike parts to keep your engine running at peak efficiency on the track or trails.
Shop trusted brands like Wiseco for forged piston kits and K&N for high-flow oil filters. Explore related categories such as Dirt Bike Air and Fuel for intake upgrades or Dirt Bike Exhaust for complete systems.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
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- Qty in Cart
- Quantity
- Price
- Subtotal
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VERTEX Piston Kit 24097A
VERTEX
$302.95A piston kit is only as good as its metallurgy and surface treatment—and VERTEX's 24097A delivers on both fronts. The T-5 heat treatment cycle ensures consistent hardness and durability under extreme combustion pressures, while the Molybdenum Disulphite...09104076- SKU:
- 09104076
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
$302.95 -
VERTEX Piston Kit 24099A
VERTEX
$302.95If you're building or rebuilding an engine that demands reliability under extreme conditions, the VERTEX Piston Kit 24099A delivers the precision-engineered durability required for sustained high-RPM performance. The advanced T-5 heat treatment process...09104107- SKU:
- 09104107
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- CYLINDER DIAMETER METRIC:
- 95.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- COMPRESSION RATIO IMPERIAL:
- 12.6:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 94.95 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- DISPLACEMENT:
- 450 CC
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
$302.95 -
VERTEX Piston Kit 24099B
VERTEX
$302.95A piston kit is only as good as its metallurgy and surface treatment—this is where engine reliability lives or dies. The VERTEX Piston Kit 24099B delivers heat-treated construction and a molybdenum disulfide coating that reduce friction during critical...09104108- SKU:
- 09104108
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- CYLINDER DIAMETER METRIC:
- 95.00 MM
- PISTON DIAMETER METRIC:
- 94.96 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- DISPLACEMENT:
- 450 CC
- COMPRESSION RATIO IMPERIAL:
- 12.6:1
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
$302.95 -
VERTEX Piston Kit 24098A
VERTEX
$293.95A quality piston kit is the foundation of engine reliability and performance—cheap pistons will fail under boost or high RPM, costing you time and money. The VERTEX Piston Kit 24098A combines advanced heat treatment and low-friction coatings to deliver...09104110- SKU:
- 09104110
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
$293.95 -
On Sale
VERTEX Piston Kit 23942A
VERTEX
MSRP: $236.95Now: $152.00Was: $236.95A quality piston kit is the foundation of engine reliability, especially when you're pushing performance boundaries. The VERTEX Piston Kit 23942A delivers the durability and precision needed for sustained high-RPM operation, with metallurgical...09103348- SKU:
- 09103348
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- PISTON DIAMETER METRIC:
- 76.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
MSRP: $236.95Now: $152.00Was: $236.95 -
On Sale
VERTEX Piston Kit 23942B
VERTEX
MSRP: $236.95Now: $152.00Was: $236.95If you're building or rebuilding an engine that demands reliability under extreme conditions, piston quality directly impacts your power output and engine longevity. The VERTEX Piston Kit 23942B delivers the metallurgical precision and surface...09103349- SKU:
- 09103349
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- DISPLACEMENT:
- 250 CC
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 76.96 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
MSRP: $236.95Now: $152.00Was: $236.95 -
VERTEX Piston Kit 23943B
VERTEX
$302.95A piston kit is only as good as its material science and thermal treatment—and the VERTEX 23943B delivers on both fronts. If you're building or rebuilding an engine that demands reliability under sustained high RPM and cylinder pressures, this kit...09103355- SKU:
- 09103355
- Availability:
- Ships Same Business Day
- Weight:
- 0.57 LBS
- BORE - OVERSIZE METRIC:
- +3.00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 79.97 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- FORGED BIG BORE
- BORE - OVERSIZE:
- +3,00 MM
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- DISPLACEMENT:
- 270 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$302.95 -
VERTEX Piston Kit with Gaskets VTK22189B-1
VERTEX
$202.95Engine longevity and peak performance depend on pistons engineered to withstand extreme combustion pressures and thermal cycling. The VERTEX Piston Kit VTK22189B-1 delivers factory-grade reliability with forged 2618 aluminum construction, ensuring your...09103358- SKU:
- 09103358
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- CAST
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- PRODUCT NAME:
- TOP END PISTON KIT
$202.95 -
VERTEX Piston Kit with Gaskets VTK22499B-1
VERTEX
$164.95High-compression forged pistons are essential for unlocking consistent power gains across your entire RPM range while maintaining the durability needed for sustained racing or spirited driving. The VERTEX VTK22499B-1 kit combines precision engineering...09103360- SKU:
- 09103360
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 47.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- DISPLACEMENT:
- 80 CC
- PISTON DIAMETER METRIC:
- 46.95 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- CAST REPLICA
$164.95 -
VERTEX Piston Kit with Gaskets VTK22795B-1
VERTEX
$289.95If you're serious about extracting maximum power and reliability from your engine, forged high-compression pistons are non-negotiable. The VERTEX Piston Kit delivers improved power and torque across your entire RPM range while the advanced Molybdenum...09103361- SKU:
- 09103361
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 2-STROKE
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PRODUCT NAME:
- TOP END PISTON KIT
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 66.36 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$289.95 -
VERTEX Piston Kit VTK22685C-1
VERTEX
$189.95Precision-engineered pistons are the foundation of reliable high-rpm performance, and the VERTEX Piston Kit VTK22685C-1 delivers the durability demanded by serious racers and high-output builds. The advanced T-5 heat treatment cycle ensures consistent...09103018- SKU:
- 09103018
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PRODUCT NAME:
- TOP END PISTON KIT
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$189.95 -
VERTEX Piston Kit VTK22685C
VERTEX
$189.95A quality piston kit is the foundation of engine reliability and performance—especially under high RPM and boost conditions. The VERTEX Piston Kit VTK22685C delivers precision-engineered pistons built to withstand extreme duty while maintaining optimal...09103019- SKU:
- 09103019
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.94 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$189.95 -
VERTEX Piston Kit VTK22581B
VERTEX
$274.95The VERTEX Piston Kit VTK22581B delivers the durability and precision required for sustained high-RPM performance, whether you're building a competition engine or upgrading a street application. Purpose-engineered with metallurgical treatments that...09103022- SKU:
- 09103022
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.35 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$274.95 -
VERTEX Piston Kit VTK22809B
VERTEX
$235.95Purpose-built for engines demanding precision and longevity, the VERTEX Piston Kit VTK22809B delivers the durability and performance characteristics required for competitive racing and high-output applications. The advanced heat-treatment process and...09103023- SKU:
- 09103023
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$235.95 -
VERTEX Piston Kit VTK22863B
VERTEX
$150.95If you're building an engine that demands reliability under sustained high RPM and boost, piston durability isn't negotiable. The VERTEX Piston Kit VTK22863B delivers the metallurgical foundation and surface engineering that separates race-proven...09103028- SKU:
- 09103028
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 47.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 47.45 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 85 CC
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$150.95 -
VERTEX Piston Circlips 72098K
VERTEX
$3.95Piston circlips are critical retention components that prevent piston pin movement during high-RPM operation. If your circlips are worn, damaged, or missing, you're risking catastrophic engine failure and potential damage to your cylinder walls. These...09130112- SKU:
- 09130112
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- APPLICATION:
- PISTON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- CIRCLIP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- PAIR
$3.95 -
VERTEX Wrist Pin - CR/YZ/SX/KX/RM 711127
VERTEX
$10.95A wrist pin failure mid-race costs you time, money, and credibility. The VERTEX Wrist Pin delivers the wear resistance and reliability you need to keep your engine performing at peak output, lap after lap. Built with case-hardened construction and...09130019- SKU:
- 09130019
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- APPLICATION:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$10.95 -
VERTEX Ring Set 590276000001
VERTEX
$79.95Piston ring wear is one of the most common causes of compression loss and power degradation in both two-stroke and four-stroke engines. The VERTEX Ring Set 590276000001 replaces worn rings with premium-grade components that restore cylinder sealing and...09120209- SKU:
- 09120209
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PISTON SIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON RING
- PISTON DIAMETER METRIC:
- 75.96 MM
$79.95 -
VERTEX Ring Set 590278000002
VERTEX
$82.95Piston ring wear is one of the most common causes of power loss and compression degradation in high-performance engines. The VERTEX Ring Set 590278000002 delivers factory-grade reliability with enhanced durability through advanced surface coatings,...09120213- SKU:
- 09120213
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- UNITS:
- SET
- PISTON DIAMETER METRIC:
- 77.96 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
$82.95 -
VERTEX Piston Kit 23666A
VERTEX
$137.95The VERTEX Piston Kit 23666A delivers the reliability and performance you need for sustained high-RPM operation. Whether you're rebuilding after a failure or upgrading for increased displacement and power, VERTEX pistons are engineered to withstand...09105949- SKU:
- 09105949
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 48 MM
- DISPLACEMENT:
- 85 CC
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 47.87 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
$137.95
