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
-
PROX Top End Gasket Set - KTM 35.6326
PROX
$99.95A worn or damaged top end gasket set compromises combustion chamber sealing, leading to power loss, oil leakage, and potential engine damage. The PROX Top End Gasket Set for KTM delivers...09345789- SKU:
- 09345789
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
$99.95 -
PROX Top End Gasket Set 35.6327
PROX
$44.05A worn or degraded top end gasket set compromises combustion chamber sealing, leading to compression loss, oil leakage, and reduced engine performance. The PROX Top End Gasket Set 35.6327 delivers...09345790- SKU:
- 09345790
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
- UNITS:
- SET
$44.05Qty in Cart: 0Quantity:Price:$44.05Subtotal: -
PROX Top End Gasket Set - KTM 35.6340
PROX
$36.95A top-end gasket set is essential for maintaining proper combustion chamber sealing and preventing oil/coolant leaks that compromise engine performance. Whether you're rebuilding after high-mileage...09345792- SKU:
- 09345792
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
$36.95 -
PROX Top End Gasket Set 35.6348
PROX
$34.95A properly sealed top end is the foundation of reliable engine performance, and worn gaskets compromise compression, invite oil leaks, and accelerate wear on critical components. The PROX Top End...09345796- SKU:
- 09345796
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
$34.95Qty in Cart: 0Quantity:Price:$34.95Subtotal: -
PROX Top End Gasket Set - KTM/Husqvarna 35.6351
PROX
$83.95A top-end gasket set is critical infrastructure for maintaining proper combustion chamber sealing and preventing oil leakage between cylinder head and crankcase surfaces. PROX delivers OEM-equivalent...09345797- SKU:
- 09345797
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
- RIDING STYLE:
- STREET
$83.95 -
PROX Top End Gasket Set - KTM 35.6420
PROX
$79.95A properly sealed top end is non-negotiable for engine reliability and performance consistency. PROX gasket sets are engineered to OEM specifications, eliminating leaks and combustion blow-by that...09345798- SKU:
- 09345798
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
- RIDING STYLE:
- STREET
$79.95Qty in Cart: 0Quantity:Price:$79.95Subtotal: -
PROX Top End Gasket Set - KTM 35.6438
PROX
$83.95A top-end gasket set is critical for maintaining compression integrity and preventing oil leakage in your KTM's cylinder head. Without a fresh seal, you risk catastrophic engine damage, lost...09345801- SKU:
- 09345801
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- STREET
$83.95 -
PROX Top End Gasket Set - KTM 35.6520
PROX
$79.95A top-end gasket set is critical to maintaining combustion chamber integrity and preventing oil seepage in high-revving engines. Whether you're rebuilding after a season of hard racing or performing...09345803- SKU:
- 09345803
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
$79.95Qty in Cart: 0Quantity:Price:$79.95Subtotal: -
PROX Gasket Kit - Complete - KTM 34.4315
PROX
$105.95A complete gasket kit is essential for any engine rebuild or top-end service—it ensures proper sealing across all critical junctions and prevents oil or coolant leaks that can compromise performance...09345860- SKU:
- 09345860
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
$105.95 -
PROX Gasket Kit - Complete 34.6216
PROX
$126.95A quality gasket kit is the foundation of engine reliability—sealing critical surfaces that prevent oil leaks, coolant loss, and combustion blow-by that compromise performance and longevity. PROX's...09346685- SKU:
- 09346685
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
$126.95 -
PROX Water Pump Rebuild Kit - Honda 57.1015
PROX
$54.95A failing water pump compromises engine cooling efficiency and risks catastrophic overheating—especially under high-RPM racing conditions. The PROX Water Pump Rebuild Kit restores OEM performance and...09346984- SKU:
- 09346984
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$54.95Qty in Cart: 0Quantity:Price:$54.95Subtotal: -
PROX Water Pump Rebuild Kit - Honda 57.1219
PROX
$41.95A failing water pump can silently destroy your engine's thermal management, leading to overheating, head gasket failure, and catastrophic damage that costs thousands to repair. The PROX Water Pump...09346985- SKU:
- 09346985
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
$41.95 -
PROX Water Pump Rebuild Kit - Honda 57.1227
PROX
$36.95A failing water pump can compromise engine cooling efficiency and lead to catastrophic overheating—especially under racing conditions or sustained high-performance driving. The PROX Water Pump...09346987- SKU:
- 09346987
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$36.95 -
PROX Water Pump Rebuild Kit - Honda 57.1319
PROX
$41.95A failing water pump compromises engine cooling efficiency and risks catastrophic overheating—especially critical under racing conditions or sustained high-performance driving. The PROX Water Pump...09346989- SKU:
- 09346989
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
$41.95 -
PROX Water Pump Rebuild Kit - Honda 57.1321
PROX
$54.95A failing water pump can compromise engine cooling and lead to catastrophic overheating—especially under racing conditions or sustained high-performance driving. The PROX 57.1321 rebuild kit restores...09346990- SKU:
- 09346990
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
$54.95Qty in Cart: 0Quantity:Price:$54.95Subtotal: -
PROX Water Pump Rebuild Kit - Honda 57.1322
PROX
$36.95A failing water pump can lead to catastrophic engine overheating and costly rebuilds. Rather than replacing the entire assembly, the PROX Water Pump Rebuild Kit gives you OEM-quality components at a...09346991- SKU:
- 09346991
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
$36.95Qty in Cart: 0Quantity:Price:$36.95Subtotal: -
PROX Water Pump Rebuild Kit - Honda 57.1324
PROX
$36.95A failing water pump is one of the most common causes of unexpected engine damage and costly downtime. The PROX Water Pump Rebuild Kit gives you a cost-effective way to restore your Honda's cooling...09346992- SKU:
- 09346992
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$36.95 -
PROX Water Pump Rebuild Kit - Honda 57.1425
PROX
$62.95A failing water pump can quickly compromise engine cooling and lead to catastrophic overheating—especially under racing conditions or sustained high-performance driving. The PROX Water Pump Rebuild...09346995- SKU:
- 09346995
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
$62.95 -
PROX Water Pump Rebuild Kit - Honda 57.1429
PROX
$52.95Your Honda's cooling system depends on a properly functioning water pump—neglect it, and you're risking catastrophic engine failure. The PROX Water Pump Rebuild Kit gives you OEM-quality seals,...09346999- SKU:
- 09346999
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$52.95 -
PROX Water Pump Rebuild Kit - Yamaha 57.2114
PROX
$36.95A failing water pump compromises engine cooling efficiency and risks catastrophic overheating during high-performance operation. The PROX Water Pump Rebuild Kit restores OEM cooling capacity with...09347004- SKU:
- 09347004
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
$36.95Qty in Cart: 0Quantity:Price:$36.95Subtotal:
