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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- Price
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COMETIC Top End Gasket Kit - 96 mm - Honda C3733
COMETIC
$85.95A failing top end gasket compromises combustion sealing and allows coolant or oil to escape—both catastrophic for engine reliability and performance. This COMETIC kit delivers OEM-correct fitment with multi-layer steel construction and Viton coating,...09347850- SKU:
- 09347850
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$85.95 -
COMETIC Top End Gasket Kit - KTM/Husqvarna/Gas Gas C3636
COMETIC
$47.95A failed top-end gasket can cost you race time, engine damage, and thousands in repairs. The COMETIC C3636 kit delivers OEM-quality sealing with performance-grade materials engineered to handle the extreme pressures of modern 4-stroke engines. Whether...09347801- SKU:
- 09347801
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$47.95 -
COMETIC Top End Gasket Kit - 80 mm - Yamaha C3766
COMETIC
$79.95A failing top-end gasket compromises combustion chamber sealing, killing power output and risking catastrophic engine damage. The COMETIC C3766 kit delivers the precision sealing your high-output engine demands, with multi-layered construction designed...09347852- SKU:
- 09347852
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$79.95 -
COMETIC Top End Gasket Kit - 91 mm - KTM C3784-EST
COMETIC
$74.95A quality gasket kit is non-negotiable for any top-end rebuild—it's your seal against compression loss, coolant weeping, and catastrophic engine failure. The COMETIC C3784-EST delivers the sealing reliability you need with EST (Extreme Sealing...09347854- SKU:
- 09347854
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$74.95 -
COMETIC Top End Gasket Kit - 97 mm - Yamaha C3786
COMETIC
$78.95A failing top end gasket will compromise combustion sealing and cost you power—or worse, create catastrophic engine damage. This Cometic kit delivers the complete solution with precision-engineered gaskets designed to handle high-horsepower 4-stroke...09347855- SKU:
- 09347855
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$78.95 -
COMETIC Top End Gasket Kit - 79 mm - Kawasaki C3787
COMETIC
$84.95A failing head gasket will cost you power, reliability, and time on the track or in the shop. COMETIC's multi-layered steel design with Viton rubber coating distributes combustion pressure evenly across the sealing surface, reducing bore distortion and...09347856- SKU:
- 09347856
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$84.95 -
COMETIC Top End Gasket Kit - 95 mm - KTM/Husqvarna/Gas Gas C3604-EST
COMETIC
$74.95A failing top end gasket compromises combustion sealing, kills power, and invites catastrophic engine damage. The COMETIC C3604-EST delivers OEM-spec sealing reliability with advanced multi-layer construction designed for high-output 4-stroke engines...09347807- SKU:
- 09347807
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$74.95 -
COMETIC Top End Gasket Kit - 96 mm - Honda C3801
COMETIC
$85.95A failed head gasket means catastrophic engine damage and costly downtime. The COMETIC Top End Gasket Kit delivers the sealing integrity and thermal management your high-output engine demands, whether you're running naturally aspirated or forced...09347859- SKU:
- 09347859
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$85.95 -
COMETIC Top End Gasket Kit - 97 mm - Yamaha C3813
COMETIC
$87.95A compromised top end gasket is one of the quickest ways to lose compression, power, and reliability. The COMETIC C3813 Top End Gasket Kit is engineered for high-output 4-stroke engines that demand precision sealing under extreme combustion pressures...09347863- SKU:
- 09347863
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$87.95 -
COMETIC Top End Gasket Kit - KTM C3818
COMETIC
$47.95A quality top-end gasket kit is essential for maintaining cylinder pressure, preventing coolant leaks, and maximizing power output on high-performance 4-stroke engines. Cometic's EST (Extreme Sealing Technology) gaskets are engineered to handle the...09347864- SKU:
- 09347864
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$47.95 -
COMETIC Top End Gasket Kit - 47 mm - Kawasaki/Suzuki C7682
COMETIC
$28.95A failing top-end gasket can compromise combustion chamber sealing, reduce ring seal efficiency, and lead to catastrophic engine failure. The COMETIC C7682 kit delivers OEM-spec sealing with multi-layer steel construction and Viton rubber coating,...09347866- SKU:
- 09347866
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$28.95 -
COMETIC Top End Gasket Kit - 99 mm - Yamaha C3279-EST
COMETIC
$90.95A failing top-end gasket will cost you power and reliability—and on high-output 4-stroke engines running boost or chasing peak naturally aspirated performance, factory gaskets often can't handle the cylinder pressures. The COMETIC C3279-EST delivers the...09347829- SKU:
- 09347829
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$90.95 -
VERTEX Top End Gasket Kit - Honda 810267
VERTEX
$86.55A leaking or degraded top end gasket compromises combustion seal integrity and invites coolant/oil contamination into your engine. The VERTEX 810267 gasket kit restores factory sealing specifications across all critical surfaces, giving you the peace of...09347999- SKU:
- 09347999
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$86.55 -
VERTEX Top End Gasket Kit - Husaberg/Husqvarna/KTM 810333
VERTEX
$48.37A quality top-end gasket kit is essential for maintaining proper compression and preventing oil seepage in high-performance engines. Whether you're rebuilding after a race season or performing routine maintenance, VERTEX gaskets provide reliable sealing...09348000- SKU:
- 09348000
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$48.37 -
VERTEX Top End Gasket Kit - Honda 810262
VERTEX
$78.72A top-end gasket kit is critical for maintaining compression integrity and preventing oil/coolant leaks that compromise engine reliability and performance. VERTEX gasket kits are engineered to OEM specifications with precision tolerances, ensuring a...09348001- SKU:
- 09348001
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$78.72 -
VERTEX Top End Gasket Kit - KTM 810328
VERTEX
$82.17A failing top-end gasket compromises compression, causes oil seepage, and forces an engine rebuild to fail prematurely. The VERTEX 810328 gasket kit eliminates guesswork by supplying OEM-equivalent seals engineered to withstand sustained high RPMs and...09348004- SKU:
- 09348004
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$82.17 -
VERTEX Top End Gasket Kit - Yamaha 810676
VERTEX
$70.38A top-end gasket kit is essential maintenance for any high-performance engine—it seals critical surfaces where combustion pressure and thermal cycling demand absolute reliability. The VERTEX 810676 delivers OEM-quality gasket materials engineered to...09348005- SKU:
- 09348005
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$70.38 -
VERTEX Top End Gasket Kit - Yamaha 810677
VERTEX
$70.38A complete top-end gasket kit is essential when rebuilding or refreshing your Yamaha engine—sealing failures lead to compression loss, oil weeping, and costly downtime. The VERTEX 810677 kit consolidates all necessary gaskets into one package, engineered...09348006- SKU:
- 09348006
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$70.38 -
VERTEX Top End Gasket Kit - Honda 8100000
VERTEX
$82.30A quality top-end gasket kit is essential for maintaining compression integrity and preventing coolant or oil seepage in high-performance engines. Whether you're rebuilding after a race season or refreshing your daily driver, VERTEX gaskets ensure a...09348007- SKU:
- 09348007
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$82.30 -
VERTEX Top End Gasket Kit - Suzuki 810505
VERTEX
$22.38A compromised top-end gasket seal leads to oil weeping, combustion leakage, and accelerated wear on your Suzuki engine. The VERTEX 810505 Kit delivers OEM-equivalent sealing surfaces with precision engineering, keeping compression where it belongs and...09348010- SKU:
- 09348010
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$22.38
