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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MOOSE OFFROAD Gasket Set 8110047MSE
MOOSE OFFROAD
$139.85A complete engine rebuild demands precision sealing at every junction—and this MOOSE OFFROAD gasket set delivers exactly that. By including all gaskets, O-rings, and valve seals in one package, you eliminate the risk of missing critical components and...09346891- SKU:
- 09346891
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$139.85 -
MOOSE OFFROAD Gasket Clutch Inner - Honda 816326MSE
MOOSE OFFROAD
$23.36A worn or damaged clutch inner gasket compromises engine sealing and invites oil leakage that degrades performance and reliability. This MOOSE OFFROAD gasket delivers OEM-level precision to restore proper combustion chamber sealing and prevent costly...09346894- SKU:
- 09346894
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$23.36 -
MOOSE OFFROAD Gasket Clutch Inner 816329MSE
MOOSE OFFROAD
$22.32Oil seepage from your clutch cover isn't just messy—it's a sign of a failing gasket that compromises engine cleanliness and performance. The MOOSE OFFROAD Gasket Clutch Inner 816329MSE delivers a straightforward, reliable seal that stops leaks at the...09346895- SKU:
- 09346895
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$22.32 -
MOOSE OFFROAD Gasket Clutch Inner 816341MSE
MOOSE OFFROAD
$20.73A worn or degraded clutch inner gasket compromises your ignition cover's seal, leading to oil seepage, contamination, and potential clutch performance loss. The MOOSE OFFROAD 816341MSE delivers a precision-engineered replacement that restores proper...09346896- SKU:
- 09346896
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
$20.73 -
MOOSE OFFROAD Top End Gasket Set - Gas Gas/Husqvarna/KTM 8100035MSE
MOOSE OFFROAD
$73.01A top-end rebuild demands precision—and this complete gasket set eliminates the guesswork by bundling every seal you need in one package. Whether you're refreshing a high-mileage engine or performing preventative maintenance, using OEM-spec gaskets...09346915- SKU:
- 09346915
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$73.01 -
MOOSE OFFROAD Gasket Set with Oil Seal - Honda 8110036MSE
MOOSE OFFROAD
$178.50A complete engine and transmission rebuild demands precision sealing at every junction—and this comprehensive gasket set eliminates the guesswork by including every gasket, O-ring, and valve seal you need in one package. Rather than sourcing components...09346917- SKU:
- 09346917
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
$178.50 -
MOOSE OFFROAD Gasket Set - Gas Gas/Husqvarna/KTM 8110044MSE
MOOSE OFFROAD
$166.03A complete engine rebuild demands precision gaskets and seals that won't compromise your engine's integrity under extreme conditions. This MOOSE OFFROAD Gasket Set eliminates the guesswork of sourcing individual components—everything you need for a full...09346918- SKU:
- 09346918
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
$166.03 -
MOOSE OFFROAD Head Cover Gasket - Yamaha 819200MSE
MOOSE OFFROAD
$51.54A leaking valve cover gasket compromises engine efficiency and risks oil contamination of critical engine components. MOOSE OFFROAD Head Cover Gaskets deliver OEM-equivalent sealing performance at a fraction of the cost, using high-tech molded rubber...09346943- SKU:
- 09346943
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
$51.54 -
MOOSE OFFROAD Motor Gasket Kit with Oil Seal - Honda 811285MSE
MOOSE OFFROAD
$179.68Engine rebuilds demand precision sealing to prevent oil leaks, compression loss, and catastrophic failure—this comprehensive gasket kit delivers OEM-quality components without the OEM price tag. Whether you're freshening a high-mileage Honda or building...09342209- SKU:
- 09342209
- Availability:
- Ships Same Business Day
- Weight:
- 0.53 LBS
$179.68 -
On Sale
PROX Top End Gasket Set - Kawasaki KX 450 F 35.4419
PROX
MSRP: $93.95Now: $76.00Was: $93.95A top-end rebuild demands precision gaskets that won't fail under combustion pressures and extreme heat cycles. The PROX Top End Gasket Set eliminates the risk of compression leaks and coolant seepage that compromise engine performance and reliability...09345771- SKU:
- 09345771
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
MSRP: $93.95Now: $76.00Was: $93.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1348
PROX
MSRP: $84.95Now: $72.00Was: $84.95A failing top-end gasket set will compromise cylinder head sealing, leading to coolant leaks, oil seepage, and lost compression—all of which degrade engine performance and reliability. The PROX 35.1348 provides everything you need for a complete Honda...09347108- SKU:
- 09347108
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $84.95Now: $72.00Was: $84.95 -
On Sale
PROX Top End Gasket Set - Honda XR650L 35.1623
PROX
MSRP: $67.95Now: $55.00Was: $67.95A top-end rebuild demands precision and reliability—compromise here and you're risking blow-by, compression loss, and catastrophic engine failure. The PROX Top End Gasket Set for the Honda XR650L gives you OEM-equivalent sealing with the durability to...09347118- SKU:
- 09347118
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
MSRP: $67.95Now: $55.00Was: $67.95 -
On Sale
PROX Top End Gasket Set - Husqvarna/Gas Gas/KTM 35.6216
PROX
MSRP: $72.95Now: $59.00Was: $72.95A top-end rebuild demands precision—worn gaskets compromise compression, invite oil seepage, and undermine engine reliability. The PROX Top End Gasket Set delivers the complete seal integrity your Husqvarna, Gas Gas, or KTM needs to perform consistently...09347147- SKU:
- 09347147
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
MSRP: $72.95Now: $59.00Was: $72.95 -
On Sale
PROX Gasket Kit - Complete - Suzuki/Kawasaki 34.4100
PROX
MSRP: $46.95Now: $38.00Was: $46.95A complete engine rebuild demands precision—gaskets that seal consistently under load, valve stem seals that hold pressure, and every component engineered to specification. This PROX kit delivers exactly that, eliminating the risk of mismatched...09345589- SKU:
- 09345589
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $46.95Now: $38.00Was: $46.95 -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475014
ATHENA
MSRP: $54.95Now: $49.00Was: $54.95A worn or degraded water pump gasket kit compromises your cooling system's integrity, leading to coolant leaks, overheating, and potential engine damage. The ATHENA Water Pump Gasket Kit for Yamaha delivers OEM-equivalent sealing performance with...09347194- SKU:
- 09347194
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $54.95Now: $49.00Was: $54.95 -
MOOSE OFFROAD Gasket Kit with Oil Seal - Honda 8110043MSE
MOOSE OFFROAD
$112.56A complete engine and transmission rebuild demands precision—and compromised gaskets or seals will undermine even the best machine work. This MOOSE OFFROAD Gasket Kit gives you factory-correct sealing surfaces across your entire drivetrain, eliminating...09347197- SKU:
- 09347197
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$112.56 -
MOOSE OFFROAD Complete Motor Gasket Kit - Honda 808213MSE
MOOSE OFFROAD
$169.49A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise reliability or performance. MOOSE Offroad delivers a comprehensive kit with all necessary components at a fraction of OEM pricing, letting you rebuild...09347198- SKU:
- 09347198
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
$169.49 -
MOOSE OFFROAD Top End Gasket Kit - Honda 8100042MSE
MOOSE OFFROAD
$106.05A top-end rebuild demands precision gasket-to-surface contact—any compromise in material quality or fit tolerance will result in oil weeping, combustion leakage, and accelerated wear. The MOOSE OFFROAD Top End Gasket Kit delivers OEM-specification...09347199- SKU:
- 09347199
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$106.05 -
MOOSE OFFROAD Complete Gasket Kit - Yamaha 8080028MSE
MOOSE OFFROAD
$154.90A complete engine and transmission rebuild demands precision gaskets that won't fail under load—and OEM replacements come with OEM pricing. The MOOSE OFFROAD Complete Gasket Kit delivers durability and accuracy at a fraction of the cost, letting you...09347200- SKU:
- 09347200
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
$154.90 -
MOOSE OFFROAD Complete Gasket Kit - Honda 8080040MSE
MOOSE OFFROAD
$86.16A complete engine and transmission rebuild demands precision-fit gaskets that won't compromise your reliability or budget. The MOOSE OFFROAD Complete Gasket Kit delivers OEM-quality sealing at a fraction of the cost, with every gasket and o-ring...09347201- SKU:
- 09347201
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$86.16
