Dirt Bike Engine Gaskets and Kits
Dirt Bike Engine Gaskets & Top-End Kits for Yamaha, Honda XR650L & CRF at JJ Motorsports
Refresh your dirt bike's top end with premium engine gaskets and complete kits from JJ Motorsports, precision-manufactured for leak-free sealing, optimal compression, and reliable performance in motocross, enduro, and trail riding. Our selection includes full gasket sets, top-end rebuild kits, O-rings, and head/base gaskets designed for perfect fitment, heat resistance, and easy installation without machining. Compatible with popular models like Yamaha YZ/WR, Honda XR650L, CRF, and more, these high-quality components from trusted brands ensure smoother operation, reduced oil consumption, and extended engine life under dusty, high-RPM conditions. From Moose Racing's comprehensive off-road sets to ProX and Athena's OEM-spec top-end kits, get everything needed for a professional rebuild—head gaskets, valve seals, base gaskets, and more—to restore power and prevent blow-by on every ride.
Shop brands like Moose Racing, ProX, and Athena for race-proven quality. Explore related categories such as dirt bike piston and ring kits for full rebuilds or dirt bike engine for cylinders and valves.
Top Dirt Bike Engine Gaskets & Kits
- Moose Offroad Complete Gasket Set Yamaha 8080037MSE – Full engine gasket kit for Yamaha models; includes all necessary seals, O-rings, and gaskets for complete top-to-bottom rebuild with OEM reliability.
- ProX Top End Gasket Set Honda XR650L 35.1623 – Precision top-end kit for Honda XR650L; features head, base, and valve stem seals for leak-free compression and easy installation.
- Athena Top End Gasket Kit Honda P400210600323 – High-performance top-end rebuild kit for Honda CRF models; includes multi-layer steel head gasket, O-rings, and seals for maximum sealing under extreme conditions.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
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On Sale
COMETIC Top End Gasket Kit - 68 mm - Honda C3171-EST
COMETIC
MSRP: $63.95Now: $60.00Was: $63.95A quality top end gasket kit is non-negotiable if you're serious about engine reliability and peak performance. Cometic's EST gasket technology delivers superior sealing on high-boost and naturally aspirated engines by distributing combustion pressure...09347824- SKU:
- 09347824
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $63.95Now: $60.00Was: $63.95 -
On Sale
COMETIC Top End Gasket Kit - Yamaha C3215
COMETIC
MSRP: $44.95Now: $42.00Was: $44.95A top end gasket kit is critical insurance for any engine rebuild or refresh—even one failed seal can lead to compression loss, coolant leaks, and catastrophic engine damage. The COMETIC C3215 uses multi-layered steel construction with Viton rubber...09347826- SKU:
- 09347826
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
MSRP: $44.95Now: $42.00Was: $44.95 -
On Sale
COMETIC Top End Gasket Kit - 97 mm - Suzuki C3233-EST
COMETIC
MSRP: $89.95Now: $85.00Was: $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 multi-layered steel construction and proprietary Viton...09347827- SKU:
- 09347827
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $89.95Now: $85.00Was: $89.95 -
On Sale
COMETIC Top End Gasket Kit - 99 mm - Suzuki C3234-EST
COMETIC
MSRP: $89.95Now: $85.00Was: $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 handle sustained high-cylinder-pressure loads, whether...09347828- SKU:
- 09347828
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $89.95Now: $85.00Was: $89.95 -
On Sale
COMETIC Top End Gasket Kit - 101 mm - Suzuki C3235-EST
COMETIC
MSRP: $89.95Now: $85.00Was: $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. COMETIC's EST (Extreme Sealing Technology) design uses...09347831- SKU:
- 09347831
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $89.95Now: $85.00Was: $89.95 -
On Sale
COMETIC Top End Gasket Kit - 77 mm - Suzuki C3406-EST
COMETIC
MSRP: $69.95Now: $66.00Was: $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 engineered to handle today's high-output 4-stroke...09347832- SKU:
- 09347832
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $69.95Now: $66.00Was: $69.95 -
On Sale
COMETIC Top End Gasket Kit - 79 mm - Suzuki C3407-EST
COMETIC
MSRP: $69.95Now: $66.00Was: $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 steel construction with proprietary Viton rubber...09347833- SKU:
- 09347833
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $69.95Now: $66.00Was: $69.95 -
On Sale
COMETIC Top End Gasket Kit - 80 mm - Suzuki C3408-EST
COMETIC
MSRP: $69.95Now: $66.00Was: $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 Viton rubber coating to handle the extreme pressures of...09347834- SKU:
- 09347834
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $69.95Now: $66.00Was: $69.95 -
On Sale
COMETIC Top End Gasket Kit - 82 mm - Suzuki C3409-EST
COMETIC
MSRP: $69.95Now: $66.00Was: $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 4-stroke engines, delivering reliable sealing on both...09347836- SKU:
- 09347836
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $69.95Now: $66.00Was: $69.95 -
On Sale
COMETIC Top End Gasket Kit - 84 mm - Suzuki C3410-EST
COMETIC
MSRP: $69.95Now: $66.00Was: $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 high-output engine demands, whether you're running naturally...09347837- SKU:
- 09347837
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $69.95Now: $66.00Was: $69.95 -
On Sale
COMETIC Top End Gasket Kit - 97 mm - Yamaha C3540-EST
COMETIC
MSRP: $68.95Now: $65.00Was: $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. Cometic's EST (Extreme Sealing Technology) design uses...09347839- SKU:
- 09347839
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $68.95Now: $65.00Was: $68.95 -
On Sale
COMETIC Top End Gasket Kit - 52.5 mm - Kawasaki C3542
COMETIC
MSRP: $31.95Now: $30.00Was: $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 with MLS (multi-layered steel) construction and EST...09347840- SKU:
- 09347840
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $31.95Now: $30.00Was: $31.95 -
On Sale
COMETIC Top End Gasket Kit - 88 mm - KTM C3605-EST
COMETIC
MSRP: $74.95Now: $70.00Was: $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 high-horsepower 4-stroke engines, whether naturally aspirated or...09347843- SKU:
- 09347843
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $74.95Now: $70.00Was: $74.95 -
On Sale
COMETIC Top End Gasket Kit - 96 mm - Honda C3621
COMETIC
MSRP: $85.95Now: $81.00Was: $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 high-output engine demands, whether you're running naturally...09347844- SKU:
- 09347844
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $85.95Now: $81.00Was: $85.95 -
On Sale
COMETIC Top End Gasket Kit - 97 mm - Yamaha C3630
COMETIC
MSRP: $53.95Now: $51.00Was: $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 aspirated or boosted—using multi-layered steel...09347845- SKU:
- 09347845
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $53.95Now: $51.00Was: $53.95 -
On Sale
COMETIC Top End Gasket Kit - 77 mm - Yamaha C3695
COMETIC
MSRP: $79.95Now: $75.00Was: $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 aspirated or forced induction. With multi-layered steel...09347847- SKU:
- 09347847
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $79.95Now: $75.00Was: $79.95 -
On Sale
COMETIC Top End Gasket Kit/O-Ring Cylinder Head Gasket - Yamaha C3731
COMETIC
MSRP: $39.95Now: $38.00Was: $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 compression, prevents oil and coolant leaks, and maintains...09347849- SKU:
- 09347849
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
MSRP: $39.95Now: $38.00Was: $39.95 -
On Sale
COMETIC Top End Gasket Kit - 82 mm - Honda C3735
COMETIC
MSRP: $67.95Now: $64.00Was: $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 high cylinder pressures—whether naturally aspirated or...09347851- SKU:
- 09347851
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $67.95Now: $64.00Was: $67.95 -
On Sale
COMETIC Top End Gasket Kit - KTM/Husqvarna C3808
COMETIC
MSRP: $92.95Now: $87.00Was: $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 today's high-output 4-stroke engines—whether naturally...09347802- SKU:
- 09347802
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $92.95Now: $87.00Was: $92.95 -
On Sale
COMETIC Top End Gasket Kit - 90 mm - KTM C3779-EST
COMETIC
MSRP: $74.95Now: $70.00Was: $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 combustion pressures, preventing blow-by and power loss that...09347853- SKU:
- 09347853
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $74.95Now: $70.00Was: $74.95
