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
PROX Top End Gasket Set - Gas Gas/Husqvarna/KTM 35.6320
PROX
MSRP: $57.95Now: $47.00Was: $57.95A leaking or degraded top-end gasket set compromises compression, fuel efficiency, and overall engine reliability. Whether you're rebuilding after high-mileage wear or freshening an engine for peak...09347771- SKU:
- 09347771
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
MSRP: $57.95Now: $47.00Was: $57.95 -
On Sale
PROX Top End Gasket Set - Husqvarna/KTM 35.6347
PROX
MSRP: $57.95Now: $47.00Was: $57.95A top-end gasket set is non-negotiable for any serious rebuild—compromised sealing leads to compression loss, oil leakage, and catastrophic engine failure. The PROX 35.6347 delivers OEM-quality...09347773- SKU:
- 09347773
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
MSRP: $57.95Now: $47.00Was: $57.95 -
On Sale
PROX Top End Gasket Set - Gas Gas/Husqvarna/KTM 35.6350
PROX
MSRP: $57.95Now: $47.00Was: $57.95A top-end rebuild demands precision sealing—any leak compromises compression, throttle response, and overall engine efficiency. The PROX Top End Gasket Set delivers OEM-grade materials and exact...09347774- SKU:
- 09347774
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
MSRP: $57.95Now: $47.00Was: $57.95 -
On Sale
PROX Top End Gasket Set - Gas Gas/Husqvarna 35.6353
PROX
MSRP: $57.95Now: $47.00Was: $57.95A top-end rebuild demands precision sealing—any compromise in gasket quality directly impacts compression, performance, and engine longevity. The PROX Top End Gasket Set is manufactured to strict...09347775- SKU:
- 09347775
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $57.95Now: $47.00Was: $57.95 -
On Sale
PROX Top End Gasket Set - Gas Gas/Husqvarna/KTM 35.6419
PROX
MSRP: $99.95Now: $81.00Was: $99.95A top-end rebuild demands precision sealing—any leak or failure compromises combustion efficiency and engine reliability. The PROX Top End Gasket Set delivers OEM-equivalent sealing without the OEM...09347776- SKU:
- 09347776
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
MSRP: $99.95Now: $81.00Was: $99.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7218
PROX
MSRP: $51.95Now: $42.00Was: $51.95A failed top-end gasket compromises compression, invites coolant and oil leaks, and tanks engine performance—especially critical if you're pushing your Beta hard on the track or trail. The PROX Top...09347778- SKU:
- 09347778
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $51.95Now: $42.00Was: $51.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7219
PROX
MSRP: $51.95Now: $42.00Was: $51.95A top-end rebuild demands precision sealing—any leak compromises compression, performance, and reliability. The PROX Top End Gasket Set delivers OEM-equivalent quality through factory-controlled...09347780- SKU:
- 09347780
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $51.95Now: $42.00Was: $51.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7220
PROX
MSRP: $51.95Now: $42.00Was: $51.95A top-end rebuild demands gasket integrity that won't compromise your engine's sealing surfaces or performance gains. The PROX Top End Gasket Set delivers OEM-equivalent quality without the premium...09347781- SKU:
- 09347781
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $51.95Now: $42.00Was: $51.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7313
PROX
MSRP: $62.95Now: $51.00Was: $62.95A compromised top-end gasket set will leak compression, rob horsepower, and leave you stranded. The PROX 35.7313 delivers the complete gasket set you need for a proper rebuild, engineered to seal...09347782- SKU:
- 09347782
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $62.95Now: $51.00Was: $62.95 -
On Sale
PROX Top End Gasket Set - Sherco 35.7314
PROX
MSRP: $88.95Now: $72.00Was: $88.95A leaking or worn top-end gasket set will compromise your Sherco's compression, throttle response, and overall reliability—especially critical if you're running lean jetting or pushing higher RPMs...09347783- SKU:
- 09347783
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
MSRP: $88.95Now: $72.00Was: $88.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7322
PROX
MSRP: $62.95Now: $51.00Was: $62.95A top-end rebuild demands precision sealing—any leak or gasket failure can compromise compression, reduce power output, and lead to costly engine damage. The PROX Top End Gasket Set delivers...09347784- SKU:
- 09347784
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
MSRP: $62.95Now: $51.00Was: $62.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7323
PROX
MSRP: $62.95Now: $51.00Was: $62.95A top-end rebuild demands precision-fit gaskets that seal reliably under extreme combustion pressures and temperature cycling. The PROX Top End Gasket Set delivers factory-spec tolerances and...09347785- SKU:
- 09347785
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
MSRP: $62.95Now: $51.00Was: $62.95 -
On Sale
PROX Top End Gasket Set - Sherco 35.7324
PROX
MSRP: $99.95Now: $81.00Was: $99.95A degraded top-end gasket set compromises engine sealing, reducing compression and inviting coolant or oil seepage that can sideline your Sherco mid-season. The PROX 35.7324 delivers OEM-grade...09347786- SKU:
- 09347786
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
MSRP: $99.95Now: $81.00Was: $99.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7332
PROX
MSRP: $62.95Now: $51.00Was: $62.95A top-end rebuild demands precision sealing—any leak compromises compression, power delivery, and engine longevity. The PROX Top End Gasket Set delivers OEM-quality sealing with factory...09347787- SKU:
- 09347787
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
MSRP: $62.95Now: $51.00Was: $62.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7351
PROX
MSRP: $130.95Now: $106.00Was: $130.95A degraded top-end gasket set compromises compression, invites oil leakage, and forces you into unnecessary downtime. The PROX 35.7351 delivers OEM-equivalent sealing across all critical junctions,...09347788- SKU:
- 09347788
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $130.95Now: $106.00Was: $130.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7360
PROX
MSRP: $130.95Now: $106.00Was: $130.95A top-end rebuild demands precision—and this gasket set delivers the sealing integrity your engine needs to perform reliably under race conditions or high-demand use. ProX engineered each gasket to...09347789- SKU:
- 09347789
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $130.95Now: $106.00Was: $130.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7416
PROX
MSRP: $130.95Now: $106.00Was: $130.95A top-end rebuild demands precision sealing—any compromise risks compression loss, coolant seepage, and catastrophic engine failure. The PROX Top End Gasket Set (35.7416) delivers OEM-quality...09347790- SKU:
- 09347790
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $130.95Now: $106.00Was: $130.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7420
PROX
MSRP: $130.95Now: $106.00Was: $130.95A compromised top-end gasket set will cost you power, reliability, and eventually, engine damage. The PROX Top End Gasket Set (35.7420) delivers the precision sealing your Beta engine needs to...09347791- SKU:
- 09347791
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $130.95Now: $106.00Was: $130.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7426
PROX
MSRP: $130.95Now: $106.00Was: $130.95A worn top-end gasket set compromises combustion sealing, leading to compression loss and decreased power output. The PROX 35.7426 restores proper sealing integrity across your top-end, ensuring...09347792- SKU:
- 09347792
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $130.95Now: $106.00Was: $130.95 -
On Sale
PROX Top End Gasket Set - Beta 35.7430
PROX
MSRP: $130.95Now: $106.00Was: $130.95When you're rebuilding your Beta's top end, a failed gasket means catastrophic oil loss, coolant leaks, and potential engine damage—none of which you can afford mid-season. The PROX Top End Gasket...09347793- SKU:
- 09347793
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $130.95Now: $106.00Was: $130.95
