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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- Quantity
- Price
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On Sale
COMETIC Top End Gasket Kit - 97 mm - Suzuki C3233-EST
COMETIC
MSRP: $89.95Now: $80.96Was: $89.95A quality gasket kit is the foundation of a reliable top end—any leakage or failure here compromises both power output and engine longevity. Cometic's EST gasket kit seals critical surfaces with...09347827- SKU:
- 09347827
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $89.95Now: $80.96Was: $89.95 -
On Sale
COMETIC Top End Gasket Kit - 99 mm - Suzuki C3234-EST
COMETIC
MSRP: $89.95Now: $80.96Was: $89.95A failing top end gasket compromises combustion sealing and invites coolant leaks that sideline your build. The COMETIC EST kit delivers multi-layered steel construction with Viton rubber coating to...09347828- SKU:
- 09347828
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $89.95Now: $80.96Was: $89.95 -
On Sale
COMETIC Top End Gasket Kit - 101 mm - Suzuki C3235-EST
COMETIC
MSRP: $89.95Now: $80.96Was: $89.95A quality top-end gasket kit is non-negotiable for maintaining cylinder pressure and preventing combustion leakage, especially when running high-output naturally aspirated or forced-induction setups...09347831- SKU:
- 09347831
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $89.95Now: $80.96Was: $89.95 -
On Sale
COMETIC Top End Gasket Kit - 77 mm - Suzuki C3406-EST
COMETIC
MSRP: $69.95Now: $62.96Was: $69.95A failing head gasket compromises cylinder pressure, kills power output, and leaves you stranded. Cometic's EST gasket kit delivers the multi-layered steel construction and Viton rubber coating...09347832- SKU:
- 09347832
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $69.95Now: $62.96Was: $69.95Qty in Cart: 0Quantity:Price:MSRP: $69.95Now: $62.96Was: $69.95Subtotal: -
On Sale
COMETIC Top End Gasket Kit - 79 mm - Suzuki C3407-EST
COMETIC
MSRP: $69.95Now: $62.96Was: $69.95A failing top-end gasket kit compromises combustion sealing and engine reliability—especially on high-output 4-stroke builds. Cometic's EST (Extreme Sealing Technology) gasket kit uses multi-layered...09347833- SKU:
- 09347833
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $69.95Now: $62.96Was: $69.95 -
On Sale
COMETIC Top End Gasket Kit - 80 mm - Suzuki C3408-EST
COMETIC
MSRP: $69.95Now: $62.96Was: $69.95A failing head gasket doesn't just leak—it compromises cylinder pressure, kills power output, and can leave you stranded. The COMETIC Top End Gasket Kit uses multi-layered steel construction with...09347834- SKU:
- 09347834
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $69.95Now: $62.96Was: $69.95 -
On Sale
COMETIC Top End Gasket Kit - 82 mm - Suzuki C3409-EST
COMETIC
MSRP: $69.95Now: $62.96Was: $69.95A top-end gasket failure can cost you a race and months of downtime. The COMETIC C3409-EST uses multi-layered steel construction with Viton rubber coating to handle the extreme pressures of modern...09347836- SKU:
- 09347836
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $69.95Now: $62.96Was: $69.95 -
On Sale
COMETIC Top End Gasket Kit - 84 mm - Suzuki C3410-EST
COMETIC
MSRP: $69.95Now: $62.96Was: $69.95A compromised top-end gasket kit leads to compression loss, coolant seepage, and catastrophic engine failure. Cometic's EST gasket kit delivers the sealing integrity and thermal management your...09347837- SKU:
- 09347837
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $69.95Now: $62.96Was: $69.95 -
On Sale
COMETIC Top End Gasket Kit - 97 mm - Yamaha C3540-EST
COMETIC
MSRP: $68.95Now: $62.06Was: $68.95A top-end gasket kit failure can compromise your engine's seal integrity and cost you horsepower—especially in high-boost or naturally aspirated applications pushing cylinder pressures to the limit...09347839- SKU:
- 09347839
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $68.95Now: $62.06Was: $68.95 -
On Sale
COMETIC Top End Gasket Kit - 52.5 mm - Kawasaki C3542
COMETIC
MSRP: $31.95Now: $28.76Was: $31.95A compromised top-end seal means lost compression, oil weeping, and catastrophic engine failure—especially under high boost or sustained high RPM. The COMETIC C3542 gasket kit eliminates these risks...09347840- SKU:
- 09347840
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $31.95Now: $28.76Was: $31.95 -
On Sale
COMETIC Top End Gasket Kit - 88 mm - KTM C3605-EST
COMETIC
MSRP: $74.95Now: $67.46Was: $74.95A failing top-end gasket kit compromises cylinder pressure, reduces power output, and risks catastrophic engine damage. The COMETIC C3605-EST delivers the sealing reliability you need for...09347843- SKU:
- 09347843
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $74.95Now: $67.46Was: $74.95 -
On Sale
COMETIC Top End Gasket Kit - 96 mm - Honda C3621
COMETIC
MSRP: $85.95Now: $77.36Was: $85.95A failing top end gasket compromises combustion seal integrity, leading to lost compression, oil leakage, and costly engine damage. The COMETIC C3621 kit delivers the precision sealing your...09347844- SKU:
- 09347844
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $85.95Now: $77.36Was: $85.95Qty in Cart: 0Quantity:Price:MSRP: $85.95Now: $77.36Was: $85.95Subtotal: -
On Sale
COMETIC Top End Gasket Kit - 97 mm - Yamaha C3630
COMETIC
MSRP: $53.95Now: $48.56Was: $53.95A failing top end gasket can cost you races, reliability, and engine integrity. This Cometic gasket kit delivers the sealing performance required for high-output 4-stroke engines—whether naturally...09347845- SKU:
- 09347845
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $53.95Now: $48.56Was: $53.95 -
On Sale
COMETIC Top End Gasket Kit - 77 mm - Yamaha C3695
COMETIC
MSRP: $79.95Now: $71.96Was: $79.95A failing head gasket doesn't just cost you power—it costs you reliability. The COMETIC Top End Gasket Kit ensures a proper seal under high combustion pressures, whether you're running naturally...09347847- SKU:
- 09347847
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $79.95Now: $71.96Was: $79.95 -
On Sale
COMETIC Top End Gasket Kit/O-Ring Cylinder Head Gasket - Yamaha C3731
COMETIC
MSRP: $39.95Now: $35.96Was: $39.95A top-end gasket kit is essential for any cylinder head removal or rebuild—whether you're performing routine maintenance or a complete engine overhaul. Using OEM-equivalent seals ensures proper...09347849- SKU:
- 09347849
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
MSRP: $39.95Now: $35.96Was: $39.95 -
On Sale
COMETIC Top End Gasket Kit - 82 mm - Honda C3735
COMETIC
MSRP: $67.95Now: $61.16Was: $67.95A top-end rebuild demands gasket integrity that matches your engine's output. Cometic's MLS head gaskets and EST technology eliminate hot spots and bore distortion, ensuring consistent sealing under...09347851- SKU:
- 09347851
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $67.95Now: $61.16Was: $67.95 -
On Sale
COMETIC Top End Gasket Kit - KTM/Husqvarna C3808
COMETIC
MSRP: $92.95Now: $83.66Was: $92.95A failing head gasket means catastrophic engine damage and downtime you can't afford. The COMETIC C3808 top end gasket kit delivers the sealing integrity and thermal stability required to handle...09347802- SKU:
- 09347802
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $92.95Now: $83.66Was: $92.95 -
On Sale
COMETIC Top End Gasket Kit - 90 mm - KTM C3779-EST
COMETIC
MSRP: $74.95Now: $67.46Was: $74.95A quality top end gasket kit is non-negotiable when you're rebuilding or maintaining a high-output 4-stroke engine. Cometic's EST technology delivers superior sealing integrity under extreme...09347853- SKU:
- 09347853
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $74.95Now: $67.46Was: $74.95 -
On Sale
COMETIC Top End Gasket Kit - KTM/Husqvarna/Gas Gas C3623
COMETIC
MSRP: $46.95Now: $42.26Was: $46.95A top-end rebuild demands precision gasket sealing to contain combustion pressures and maintain ring seal—especially in high-output 4-stroke engines where even minor leakage degrades performance and...09347804- SKU:
- 09347804
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $46.95Now: $42.26Was: $46.95 -
On Sale
COMETIC Top End Gasket Kit - 79 mm - KTM/Husqvarna/Gas Gas C3595-EST
COMETIC
MSRP: $87.95Now: $79.16Was: $87.95A top-end gasket failure can sideline your bike mid-season, and inferior gaskets invite compression loss, oil leaks, and catastrophic engine damage. The COMETIC EST gasket kit eliminates guesswork...09347806- SKU:
- 09347806
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $87.95Now: $79.16Was: $87.95
