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!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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PROX Top End Gasket Set - Kawasaki 35.4313
PROX
$46.95A properly sealed top end is non-negotiable for maintaining compression, preventing coolant leaks, and ensuring consistent engine performance across heat cycles. The PROX Top End Gasket Set delivers OEM-equivalent sealing integrity with premium materials...09345763- SKU:
- 09345763
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
$46.95Qty in Cart: 0Quantity:Price:$46.95Subtotal: -
PROX Top End Gasket Set - Kawasaki 35.4339
PROX
$88.95A quality top-end gasket set is the foundation of a reliable engine rebuild—sealing combustion chambers and preventing oil leaks that compromise performance. PROX's precision-engineered gasket set maintains critical tolerances and withstands the thermal...09345767- SKU:
- 09345767
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
$88.95 -
PROX Top End Gasket Set - KTM 35.6011
PROX
$22.95A quality gasket set is the foundation of a reliable top end—sealing surfaces under extreme combustion pressures so you can focus on performance, not leaks. The PROX Top End Gasket Set for KTM engines delivers OEM-equivalent sealing integrity with...09345772- SKU:
- 09345772
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
$22.95 -
PROX Top End Gasket Set 35.6012
PROX
$30.95A compromised top end gasket set is a silent killer for engine reliability—allowing coolant and oil seepage that snowballs into catastrophic damage. The PROX 35.6012 Top End Gasket Set delivers factory-spec sealing integrity with premium materials...09345773- SKU:
- 09345773
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
$30.95Qty in Cart: 0Quantity:Price:$30.95Subtotal: -
PROX Top End Gasket Set - KTM 35.6018
PROX
$30.95A top-end gasket set is critical to maintaining proper combustion chamber sealing and preventing oil leakage in high-stress racing conditions. The PROX 35.6018 is engineered to OEM specifications for KTM applications, ensuring reliable performance across...09345774- SKU:
- 09345774
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
$30.95Qty in Cart: 0Quantity:Price:$30.95Subtotal: -
PROX Top End Gasket Set 35.6019
PROX
$30.95A top-end gasket set is the foundation of a reliable engine rebuild—it seals critical passages between cylinder head and block, preventing coolant and oil leaks that compromise performance and longevity. The PROX 35.6019 delivers OEM-quality sealing...09345775- SKU:
- 09345775
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
$30.95 -
PROX Top End Gasket Set - KTM/Husqvarna 35.6113
PROX
$30.95A quality top-end gasket set is essential for maintaining proper compression and preventing fluid leaks in high-stress racing environments. PROX's 35.6113 gasket set is engineered to exact OEM specifications, ensuring reliable sealing across multiple...09345777- SKU:
- 09345777
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
$30.95Qty in Cart: 0Quantity:Price:$30.95Subtotal: -
PROX Top End Gasket Set - KTM 35.6218
PROX
$30.95A compromised top end gasket set is a silent killer—fuel and oil escape where they shouldn't, compression drops, and your engine's reliability takes a hit. The PROX Top End Gasket Set for KTM delivers OEM-equivalent sealing integrity with precision...09345779- SKU:
- 09345779
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
$30.95 -
PROX Top End Gasket Set - KTM 35.6222
PROX
$30.95A quality top-end gasket set is the foundation of a reliable rebuild—it seals critical combustion chambers and prevents oil leakage that can compromise engine performance. The PROX 35.6222 is engineered to OEM specifications for KTM engines, ensuring...09345781- SKU:
- 09345781
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$30.95 -
PROX Top End Gasket Set 35.6227
PROX
$46.95A quality top-end gasket set is the foundation of engine reliability—it seals critical combustion pressures and prevents costly coolant or oil leaks that can sideline your bike or car. The PROX 35.6227 delivers precision-engineered gaskets manufactured...09345782- SKU:
- 09345782
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
$46.95 -
PROX Top End Gasket Set - KTM 35.6253
PROX
$30.95A top-end gasket set is essential maintenance for any KTM engine that's seen significant track time or mileage. PROX gaskets are precision-engineered to OEM specifications, ensuring reliable sealing under extreme combustion pressures and temperature...09345784- SKU:
- 09345784
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
- UNITS:
- SET
$30.95Qty in Cart: 0Quantity:Price:$30.95Subtotal: -
PROX Top End Gasket Set - KTM 35.6326
PROX
$99.95A worn or damaged top end gasket set compromises combustion chamber sealing, leading to power loss, oil leakage, and potential engine damage. The PROX Top End Gasket Set for KTM delivers OEM-equivalent quality with precision tolerances, ensuring reliable...09345789- SKU:
- 09345789
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
$99.95 -
PROX Top End Gasket Set 35.6327
PROX
$44.05A worn or degraded top end gasket set compromises combustion chamber sealing, leading to compression loss, oil leakage, and reduced engine performance. The PROX Top End Gasket Set 35.6327 delivers OEM-quality sealing with precision manufacturing to...09345790- SKU:
- 09345790
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
- UNITS:
- SET
$44.05Qty in Cart: 0Quantity:Price:$44.05Subtotal: -
PROX Top End Gasket Set - KTM 35.6340
PROX
$36.95A top-end gasket set is essential for maintaining proper combustion chamber sealing and preventing oil/coolant leaks that compromise engine performance. Whether you're rebuilding after high-mileage service or replacing a failed gasket, PROX delivers...09345792- SKU:
- 09345792
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
$36.95 -
PROX Top End Gasket Set 35.6348
PROX
$34.95A properly sealed top end is the foundation of reliable engine performance, and worn gaskets compromise compression, invite oil leaks, and accelerate wear on critical components. The PROX Top End Gasket Set 35.6348 delivers OEM-quality sealing with...09345796- SKU:
- 09345796
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
$34.95Qty in Cart: 0Quantity:Price:$34.95Subtotal: -
PROX Top End Gasket Set - KTM/Husqvarna 35.6351
PROX
$83.95A top-end gasket set is critical infrastructure for maintaining proper combustion chamber sealing and preventing oil leakage between cylinder head and crankcase surfaces. PROX delivers OEM-equivalent gaskets engineered to exact specifications, ensuring...09345797- SKU:
- 09345797
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
- RIDING STYLE:
- STREET
$83.95 -
PROX Top End Gasket Set - KTM 35.6420
PROX
$79.95A properly sealed top end is non-negotiable for engine reliability and performance consistency. PROX gasket sets are engineered to OEM specifications, eliminating leaks and combustion blow-by that compromise horsepower and longevity. For KTM riders who...09345798- SKU:
- 09345798
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
- RIDING STYLE:
- STREET
$79.95Qty in Cart: 0Quantity:Price:$79.95Subtotal: -
PROX Top End Gasket Set - KTM 35.6438
PROX
$83.95A top-end gasket set is critical for maintaining compression integrity and preventing oil leakage in your KTM's cylinder head. Without a fresh seal, you risk catastrophic engine damage, lost performance, and costly repairs. PROX's precision-engineered...09345801- SKU:
- 09345801
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- STREET
$83.95 -
PROX Top End Gasket Set - KTM 35.6520
PROX
$79.95A top-end gasket set is critical to maintaining combustion chamber integrity and preventing oil seepage in high-revving engines. Whether you're rebuilding after a season of hard racing or performing preventative maintenance, PROX's OEM-equivalent gasket...09345803- SKU:
- 09345803
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
$79.95Qty in Cart: 0Quantity:Price:$79.95Subtotal: -
PROX Gasket Kit - Complete - KTM 34.4315
PROX
$105.95A complete gasket kit is essential for any engine rebuild or top-end service—it ensures proper sealing across all critical junctions and prevents oil or coolant leaks that can compromise performance and reliability. The PROX Gasket Kit for KTM delivers...09345860- SKU:
- 09345860
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
$105.95
