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 performance, the PROX Top End Gasket Set delivers the...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 sealing without the OEM price tag, manufactured to exacting...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 fitment across Gas Gas, Husqvarna, and KTM platforms,...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 ProX specifications, delivering the reliable sealing...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 price tag, manufactured to strict ProX specifications...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 End Gasket Set delivers factory-spec sealing with...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 manufacturing, ensuring consistent bore sealing across...09347780- SKU:
- 09347780
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $51.95Now: $42.00Was: $51.95Qty in Cart: 0Quantity:Price:MSRP: $51.95Now: $42.00Was: $51.95Subtotal: -
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 price, engineered to ProX specifications for reliable...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 reliably under sustained high heat and cylinder pressure...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. This ProX gasket set delivers factory-spec sealing...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 OEM-level quality at a fraction of dealership pricing,...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 material consistency across all critical sealing surfaces,...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 sealing surfaces with materials engineered to handle...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 specifications that eliminate guesswork during your rebuild. Whether...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, restoring your engine's integrity and allowing you to...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 withstand extreme temperatures while maintaining a...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 construction with materials engineered to handle sustained...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 prevent oil and coolant leaks while maintaining proper...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 consistent cylinder pressure and reliable performance...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 Set delivers precision-manufactured sealing surfaces...09347793- SKU:
- 09347793
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
MSRP: $130.95Now: $106.00Was: $130.95
