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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VINTCO Oil Seal Kit - Honda KOS004
VINTCO
$31.95A proper engine rebuild demands precision sealing throughout the lower end—any compromise here leads to oil weeping, contamination, and premature wear. The VINTCO Oil Seal Kit delivers OEM-quality seals and o-rings engineered to maintain positive...09347356- SKU:
- 09347356
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$31.95 -
VINTCO Oil Seal Kit - Honda KOS007
VINTCO
$41.95A complete engine rebuild demands precision—and that starts with quality seals. The VINTCO Oil Seal Kit KOS007 provides all the critical seals and o-rings your Honda engine's lower end requires, eliminating the need to source components individually and...09347357- SKU:
- 09347357
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
$41.95Qty in Cart: 0Quantity:Price:$41.95Subtotal: -
VINTCO Oil Seal Kit - Honda KOS003
VINTCO
$27.95A complete engine rebuild demands precision sealing—any leak in your lower end will compromise compression and invite contamination into your oil system. This comprehensive seal kit eliminates the guesswork by bundling all critical seals and o-rings...09347358- SKU:
- 09347358
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$27.95 -
VINTCO Oil Seal Kit - Kawasaki KOS015
VINTCO
$42.95A complete engine rebuild demands precision at every seal point—and this VINTCO Oil Seal Kit eliminates the guesswork by bundling all the critical seals your Kawasaki engine needs in one package. Overlooking even a single oil seal during reassembly...09347359- SKU:
- 09347359
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
$42.95 -
VINTCO Oil Seal Kit - Kawasaki KOS017
VINTCO
$42.95A complete engine rebuild demands precision sealing at every critical junction, and this VINTCO Oil Seal Kit delivers exactly that for Kawasaki engines. Compromised seals lead to oil weeping, contamination, and accelerated wear—issues that undermine the...09347360- SKU:
- 09347360
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
$42.95 -
VINTCO Oil Seal Kit - Kawasaki KOS013
VINTCO
$39.95A complete engine rebuild demands precision sealing to prevent oil leakage and maintain proper lubrication throughout your lower end. This VINTCO Oil Seal Kit delivers OEM-grade seals and o-rings engineered to factory specifications, ensuring your...09347361- SKU:
- 09347361
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
$39.95 -
MOOSE RACING Top End Gasket 8100034MSE
MOOSE RACING
$99.40A quality top-end gasket is critical to preventing oil leaks and maintaining compression integrity in your engine. MOOSE RACING's precision-engineered gasket ensures a reliable seal under high RPM conditions, reducing the risk of costly internal damage...09347460- SKU:
- 09347460
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$99.40 -
MOOSE RACING Top End Gasket - Honda 8100047MSE
MOOSE RACING
$72.98A properly sealed top end is critical to maintaining compression, preventing coolant and oil weeping, and ensuring your engine performs at its peak. The MOOSE RACING Top End Gasket is engineered to Honda specifications and manufactured to OEM tolerances,...09347461- SKU:
- 09347461
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$72.98 -
MOOSE RACING Top End Gasket - Yamaha 8100060MSE
MOOSE RACING
$36.41A properly sealed top end is critical to maintaining combustion pressure, preventing oil leakage, and ensuring reliable engine performance. The MOOSE RACING Top End Gasket is engineered to OEM specifications, providing a dependable seal that withstands...09347462- SKU:
- 09347462
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$36.41 -
MOOSE RACING Outer Clutch Cover Gasket - Kawasaki 816831MSE
MOOSE RACING
$11.11A failing outer clutch cover gasket leads to oil seepage that compromises clutch performance and risks engine damage. Whether you're rebuilding your clutch assembly or addressing a persistent leak around the ignition cover, this OEM-equivalent gasket...09347465- SKU:
- 09347465
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$11.11 -
MOOSE RACING Inner Clutch Gasket - Honda 816352MSE
MOOSE RACING
$13.18A failing clutch gasket compromises both sealing integrity and clutch performance, leading to oil weeping, contamination, and premature wear. This OEM-specification gasket restores a reliable seal at the clutch cover, preventing fluid loss and...09347469- SKU:
- 09347469
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$13.18 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600323
ATHENA
MSRP: $65.95Now: $59.00Was: $65.95Whether you're prepping for race day or executing a midseason engine refresh, compression ratio optimization is critical to extracting maximum performance from your Honda. The ATHENA Top End Gasket Kit gives you the flexibility to tune your engine's...09347377- SKU:
- 09347377
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $65.95Now: $59.00Was: $65.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210900322
ATHENA
MSRP: $212.95Now: $192.00Was: $212.95A complete gasket kit is the foundation of a reliable engine rebuild—failed gaskets lead to coolant leaks, oil seepage, and catastrophic engine damage. The ATHENA P400210900322 combines precision engineering with high-temperature durability, ensuring...09347472- SKU:
- 09347472
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
MSRP: $212.95Now: $192.00Was: $212.95 -
On Sale
ATHENA Top End Gasket Kit - Beta P400060600014
ATHENA
MSRP: $58.95Now: $53.00Was: $58.95Whether you're prepping for race day or executing a midseason engine refresh, compression ratio optimization is critical to extracting maximum power from your engine. This kit gives you the flexibility to run either standard fuel with stock compression...09347506- SKU:
- 09347506
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
MSRP: $58.95Now: $53.00Was: $58.95 -
On Sale
ATHENA Top End Gasket Kit - Kawasaki P400250600071
ATHENA
MSRP: $87.95Now: $79.00Was: $87.95Whether you're prepping for race day or performing a mid-season engine refresh, a properly sealed top end is non-negotiable for peak performance and reliability. This kit gives you the flexibility to optimize your compression ratio based on fuel type—run...09347507- SKU:
- 09347507
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
MSRP: $87.95Now: $79.00Was: $87.95 -
On Sale
ATHENA Complete Gasket Kit - Beta P400060900014
ATHENA
MSRP: $176.95Now: $159.00Was: $176.95A complete engine rebuild demands gaskets that maintain a reliable seal under sustained high heat and pressure—this kit delivers exactly that. The ATHENA Complete Gasket Kit combines proven materials with intelligent engineering to eliminate compression...09347509- SKU:
- 09347509
- Availability:
- Ships Same Business Day
- Weight:
- 0.52 LBS
MSRP: $176.95Now: $159.00Was: $176.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250900071
ATHENA
MSRP: $227.95Now: $205.00Was: $227.95A compromised gasket kit leaves your engine vulnerable to coolant leaks, oil seepage, and combustion chamber failures that can quickly escalate into catastrophic damage. The ATHENA Complete Gasket Kit delivers the comprehensive seal integrity your...09347510- SKU:
- 09347510
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
MSRP: $227.95Now: $205.00Was: $227.95 -
On Sale
ATHENA Complete Gasket Kit - Suzuki P400510900099
ATHENA
MSRP: $218.95Now: $197.00Was: $218.95A complete engine rebuild demands gaskets that can handle thermal cycling and high combustion pressures without failure. The ATHENA Complete Gasket Kit delivers OEM-equivalent sealing performance across all critical engine surfaces, eliminating the risk...09347511- SKU:
- 09347511
- Availability:
- Ships Same Business Day
- Weight:
- 0.64 LBS
MSRP: $218.95Now: $197.00Was: $218.95 -
On Sale
ATHENA Water Pump Gasket Kit - Kawasaki P400250475017
ATHENA
MSRP: $50.95Now: $46.00Was: $50.95A failing water pump gasket compromises your cooling system's integrity, risking catastrophic overheating and engine damage. This ATHENA gasket kit supplies all the OEM-spec seals and components needed to restore your Kawasaki's water circulation system...09347512- SKU:
- 09347512
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
MSRP: $50.95Now: $46.00Was: $50.95 -
On Sale
ATHENA Water Pump Gasket Kit - Gas Gas/Husqvarna/KTM P400270475022
ATHENA
MSRP: $61.95Now: $56.00Was: $61.95A failing water pump gasket can compromise your engine's cooling system and lead to costly downtime. This ATHENA gasket kit provides OEM-quality sealing surfaces specifically engineered for Gas Gas, Husqvarna, and KTM platforms, ensuring reliable thermal...09347513- SKU:
- 09347513
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
MSRP: $61.95Now: $56.00Was: $61.95
