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!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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PROX Top End Gasket Set - Beta 35.7430
PROX
$124.95Top End Gasket Set - 35.743 Comprehensive gasket set for top-end engine rebuilds Manufactured to ProX specifications for reliable performance Includes all necessary gaskets for a complete overhaul Designed for optimal sealing to prevent...09347793- SKU:
- 09347793
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$124.95 -
COMETIC Top End Gasket Kit - 68 mm - Honda C3171-EST
COMETIC
$63.95Top End Gasket Kit - 68 mm - Honda Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the gasket...09347824- SKU:
- 09347824
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$63.95 -
COMETIC Top End Gasket Kit - Yamaha C3215
COMETIC
$44.95Top End Gasket Kit - Yamaha Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the gasket...09347826- SKU:
- 09347826
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$44.95 -
COMETIC Top End Gasket Kit - 97 mm - Suzuki C3233-EST
COMETIC
$89.95Top End Gasket Kit - 97 mm - Suzuki Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the...09347827- SKU:
- 09347827
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$89.95 -
COMETIC Top End Gasket Kit - 99 mm - Suzuki C3234-EST
COMETIC
$89.95Top End Gasket Kit - 99 mm - Suzuki Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the...09347828- SKU:
- 09347828
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$89.95 -
COMETIC Top End Gasket Kit - 101 mm - Suzuki C3235-EST
COMETIC
$89.95Top End Gasket Kit - 101 mm - Suzuki Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the...09347831- SKU:
- 09347831
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$89.95 -
COMETIC Top End Gasket Kit - 77 mm - Suzuki C3406-EST
COMETIC
$69.95Top End Gasket Kit - 77 mm - Suzuki Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the...09347832- SKU:
- 09347832
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$69.95 -
COMETIC Top End Gasket Kit - 79 mm - Suzuki C3407-EST
COMETIC
$69.95Top End Gasket Kit - 79 mm - Suzuki Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the...09347833- SKU:
- 09347833
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$69.95 -
COMETIC Top End Gasket Kit - 80 mm - Suzuki C3408-EST
COMETIC
$69.95Top End Gasket Kit - 80 mm - Suzuki Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the...09347834- SKU:
- 09347834
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$69.95 -
COMETIC Top End Gasket Kit - 82 mm - Suzuki C3409-EST
COMETIC
$69.95Top End Gasket Kit - 82 mm - Suzuki Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the...09347836- SKU:
- 09347836
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$69.95 -
COMETIC Top End Gasket Kit - 84 mm - Suzuki C3410-EST
COMETIC
$69.95Top End Gasket Kit - 84 mm - Suzuki Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the...09347837- SKU:
- 09347837
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$69.95 -
COMETIC Top End Gasket Kit - 97 mm - Yamaha C3540-EST
COMETIC
$68.95Top End Gasket Kit - 97 mm - Yamaha Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the...09347839- SKU:
- 09347839
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$68.95 -
COMETIC Top End Gasket Kit - 52.5 mm - Kawasaki C3542
COMETIC
$31.95Top End Gasket Kit - 52.5 mm - Kawasaki Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the...09347840- SKU:
- 09347840
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$31.95 -
COMETIC Top End Gasket Kit - 88 mm - KTM C3605-EST
COMETIC
$74.95Top End Gasket Kit - 88 mm - KTM Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the gasket...09347843- SKU:
- 09347843
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$74.95 -
COMETIC Top End Gasket Kit - 96 mm - Honda C3621
COMETIC
$85.95Top End Gasket Kit - 96 mm - Honda Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the gasket...09347844- SKU:
- 09347844
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$85.95 -
COMETIC Top End Gasket Kit - 97 mm - Yamaha C3630
COMETIC
$53.95Top End Gasket Kit - 97 mm - Yamaha Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the...09347845- SKU:
- 09347845
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$53.95 -
COMETIC Top End Gasket Kit - 77 mm - Yamaha C3695
COMETIC
$79.95Top End Gasket Kit - 77 mm - Yamaha Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the...09347847- SKU:
- 09347847
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$79.95 -
COMETIC Top End Gasket Kit/O-Ring Cylinder Head Gasket - Yamaha C3731
COMETIC
$39.95Top End Gasket Kit/O-Ring Cylinder Head Gasket - Yamaha Top-end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top-end specific O-rings or seals needed for R&R of top end, Materials will vary depending on what is...09347849- SKU:
- 09347849
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$39.95 -
COMETIC Top End Gasket Kit - 82 mm - Honda C3735
COMETIC
$67.95Top End Gasket Kit - 82 mm - Honda Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the gasket...09347851- SKU:
- 09347851
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$67.95 -
COMETIC Top End Gasket Kit - KTM/Husqvarna C3808
COMETIC
$92.95Top End Gasket Kit - KTM/Husqvarna Top end gasket kit includes correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the gasket...09347802- SKU:
- 09347802
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$92.95
