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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On Sale
PROX Gasket Kit - Complete - KTM 34.6420
PROX
MSRP: $214.95Now: $183.00Was: $214.95A complete gasket kit is essential for any engine rebuild or top-end service on your KTM, ensuring proper sealing across all critical engine interfaces. Using OEM-equivalent gaskets prevents compression leaks, oil seepage, and potential engine damage...09345641- SKU:
- 09345641
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
MSRP: $214.95Now: $183.00Was: $214.95 -
On Sale
PROX Gasket Kit - Complete - KTM 34.6512
PROX
MSRP: $172.95Now: $140.00Was: $172.95A complete gasket kit is essential for any engine rebuild or top-end refresh—it ensures proper sealing across all critical junctures and prevents oil leakage, coolant seepage, and combustion gas bypass that compromise performance and reliability. The...09345647- SKU:
- 09345647
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
MSRP: $172.95Now: $140.00Was: $172.95 -
On Sale
PROX Gasket Kit - Complete - KTM 34.6520
PROX
MSRP: $214.95Now: $183.00Was: $214.95A complete gasket kit is essential for any engine rebuild or top-end service on your KTM—it ensures a proper seal across all critical combustion chamber interfaces and prevents oil leakage that compromises performance and reliability. PROX gasket kits...09345648- SKU:
- 09345648
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- COMPLETE
MSRP: $214.95Now: $183.00Was: $214.95Qty in Cart: 0Quantity:Price:MSRP: $214.95Now: $183.00Was: $214.95Subtotal: -
On Sale
PROX Top End Gasket Set - Honda 35.1070
PROX
MSRP: $25.95Now: $21.00Was: $25.95A properly sealed top end is non-negotiable for consistent power delivery and engine longevity. The PROX Top End Gasket Set delivers OEM-equivalent sealing without the premium price tag, making it the smart choice for rebuild projects and high-mileage...09345650- SKU:
- 09345650
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $25.95Now: $21.00Was: $25.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1112
PROX
MSRP: $25.95Now: $21.00Was: $25.95A compromised top end gasket set is one of the fastest ways to lose compression, leak oil, and invite catastrophic engine failure. PROX's top end gasket set for Honda applications delivers OEM-equivalent sealing performance with the reliability you need...09345652- SKU:
- 09345652
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
MSRP: $25.95Now: $21.00Was: $25.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1113
PROX
MSRP: $25.95Now: $21.00Was: $25.95A quality top end gasket set is fundamental to maintaining cylinder head integrity and preventing oil and coolant leaks that compromise engine reliability. PROX's 35.1113 gasket set delivers OEM-equivalent sealing performance with precision-cut...09345653- SKU:
- 09345653
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
MSRP: $25.95Now: $21.00Was: $25.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1115
PROX
MSRP: $25.95Now: $21.00Was: $25.95A compromised top end gasket set will leak oil, reduce compression, and compromise engine reliability—especially critical if you're pushing your Honda to the limit on track or street. PROX's 35.1115 gasket set delivers OEM-equivalent sealing without the...09345654- SKU:
- 09345654
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
MSRP: $25.95Now: $21.00Was: $25.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1218
PROX
MSRP: $41.95Now: $34.00Was: $41.95A top-end gasket set is essential for maintaining a reliable seal across your cylinder head, ensuring proper combustion pressure and preventing coolant or oil leaks that compromise engine performance. The PROX 35.1218 delivers OEM-equivalent quality at a...09345657- SKU:
- 09345657
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
MSRP: $41.95Now: $34.00Was: $41.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1225
PROX
MSRP: $44.05Now: $34.00Was: $44.05A degraded top end gasket set compromises cylinder head seal integrity, leading to coolant leaks, oil seepage, and lost compression—all of which tank performance and reliability. The PROX 35.1225 Top End Gasket Set delivers OEM-equivalent sealing for...09345661- SKU:
- 09345661
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
MSRP: $44.05Now: $34.00Was: $44.05Qty in Cart: 0Quantity:Price:MSRP: $44.05Now: $34.00Was: $44.05Subtotal: -
On Sale
PROX Top End Gasket Set - Honda 35.1227
PROX
MSRP: $88.95Now: $72.00Was: $88.95A quality top-end gasket set is essential for maintaining cylinder head integrity and preventing oil and coolant leaks that compromise engine performance. The PROX 35.1227 delivers OEM-equivalent sealing with precision engineering, ensuring your Honda...09345662- SKU:
- 09345662
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
MSRP: $88.95Now: $72.00Was: $88.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1233
PROX
MSRP: $69.95Now: $59.00Was: $69.95A compromised top end gasket set leads to oil leaks, compression loss, and catastrophic engine failure—especially under sustained racing conditions. PROX's 35.1233 gasket set delivers factory-grade sealing with OEM-equivalent materials, ensuring reliable...09345663- SKU:
- 09345663
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $69.95Now: $59.00Was: $69.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1312
PROX
MSRP: $41.95Now: $34.00Was: $41.95A properly sealed top end is the foundation of reliable engine performance, and PROX gasket sets are engineered to maintain that seal under the demanding conditions of track use and high-RPM operation. This Honda-specific gasket set eliminates the...09345668- SKU:
- 09345668
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $41.95Now: $34.00Was: $41.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1325
PROX
MSRP: $39.95Now: $34.00Was: $39.95A properly sealed top end is non-negotiable for engine reliability and peak performance. The PROX Top End Gasket Set delivers OEM-quality sealing with precision-engineered materials that withstand high combustion pressures and thermal cycling. Whether...09345670- SKU:
- 09345670
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $39.95Now: $34.00Was: $39.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1333
PROX
MSRP: $72.95Now: $59.00Was: $72.95A quality top-end gasket set is essential for maintaining compression integrity and preventing oil leaks that compromise engine performance and reliability. PROX's precision-engineered gasket set ensures proper sealing across all critical combustion...09345671- SKU:
- 09345671
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
MSRP: $72.95Now: $59.00Was: $72.95Qty in Cart: 0Quantity:Price:MSRP: $72.95Now: $59.00Was: $72.95Subtotal: -
On Sale
PROX Top End Gasket Set - Honda 35.1334
PROX
MSRP: $88.95Now: $72.00Was: $88.95A top-end gasket set is critical for maintaining cylinder head sealing integrity and preventing coolant and oil leakage that can compromise engine performance and reliability. PROX's 35.1334 gasket set delivers OEM-equivalent durability with precision...09345672- SKU:
- 09345672
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
MSRP: $88.95Now: $72.00Was: $88.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1402
PROX
MSRP: $89.95Now: $76.00Was: $89.95A top-end gasket set is critical for maintaining compression, preventing coolant and oil seepage, and ensuring reliable performance between rebuild cycles. PROX's 35.1402 gasket set delivers OEM-equivalent durability with precision fitment, eliminating...09345677- SKU:
- 09345677
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
MSRP: $89.95Now: $76.00Was: $89.95 -
On Sale
PROX Top End Gasket Set - Honda 35.1409
PROX
MSRP: $41.95Now: $34.00Was: $41.95A top end gasket set is critical to maintaining cylinder head integrity and preventing coolant or oil seepage that compromises engine performance and reliability. The PROX 35.1409 delivers OEM-quality sealing across all top end components, ensuring your...09345681- SKU:
- 09345681
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $41.95Now: $34.00Was: $41.95 -
On Sale
PROX Top End Gasket Set - Yamaha 35.2113
PROX
MSRP: $22.95Now: $17.00Was: $22.95A top-end gasket set is essential maintenance for any high-revving engine—proper sealing prevents coolant and oil leakage that compromises performance and engine longevity. The PROX 35.2113 delivers OEM-equivalent quality at a fraction of dealer pricing,...09345685- SKU:
- 09345685
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
MSRP: $22.95Now: $17.00Was: $22.95 -
On Sale
PROX Top End Gasket Set - Yamaha 35.2122
PROX
MSRP: $25.95Now: $21.00Was: $25.95A quality top-end gasket set is non-negotiable for any engine rebuild or head service—it's your seal against oil leaks, coolant seepage, and compression loss that compromise performance and reliability. The PROX 35.2122 is engineered to OEM...09345686- SKU:
- 09345686
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
MSRP: $25.95Now: $21.00Was: $25.95 -
On Sale
PROX Top End Gasket Set - Yamaha 35.2201
PROX
MSRP: $51.95Now: $42.00Was: $51.95A degraded top end gasket set compromises cylinder sealing, leading to compression loss, oil leakage, and reduced engine efficiency. The PROX 35.2201 restores OEM-spec sealing integrity with precision-engineered gaskets designed specifically for Yamaha...09345687- SKU:
- 09345687
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
MSRP: $51.95Now: $42.00Was: $51.95
