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
-
On Sale
ATHENA Top End Gasket Kit - Honda P400210600202
ATHENA
MSRP: $61.95Now: $53.00Was: $61.95A top-end refresh is essential before competition season, and the ATHENA Top End Gasket Kit delivers the precision sealing your engine needs for consistent performance and reliability. This kit gives...09342538- SKU:
- 09342538
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $61.95Now: $53.00Was: $61.95 -
COMETIC Bottom End Gasket Set C3299
COMETIC
$15.95Engine seals and gaskets are critical wear items that degrade with heat cycles and age—compromised bottom end gaskets lead to oil leaks, contamination, and catastrophic engine failure. The COMETIC...09342514- SKU:
- 09342514
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- MODEL:
- HI-PERFORMANCE
- TYPE:
- BOTTOM END
- BORE SIZE METRIC:
- 55.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$15.95 -
COMETIC Top End Gasket Set C3395-EST
COMETIC
$68.95A quality gasket set is non-negotiable when rebuilding a high-performance top end—improper sealing leads to compression loss, coolant weeps, and catastrophic engine failure. The COMETIC C3395-EST...09342451- SKU:
- 09342451
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE IMPERIAL:
- 3.819'
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$68.95Qty in Cart: 0Quantity:Price:$68.95Subtotal: -
COMETIC Top End Gasket Set C7944-EST
COMETIC
$84.95A failing top-end gasket doesn't just leak—it compromises combustion sealing, kills ring seal efficiency, and can cascade into catastrophic engine damage. The COMETIC C7944-EST uses Multi-Layer Steel...09342426- SKU:
- 09342426
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 95.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
$84.95 -
Cylinder Works Big Bore Gasket Kit for 2010-2017 Honda CRF250R 11007-G01
CYLINDER WORKS
$75.95When you're ready to unlock serious power gains on your CRF250R, you need a big bore kit that actually delivers—without the headache of machine work or expensive re-plating. The Cylinder Works...09342383- SKU:
- 09342383
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- NICKEL SILICON CARBIDE
- BORE SIZE METRIC:
- OVERSIZED (+3.00 MM)
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- BIG BORE
$75.95Qty in Cart: 0Quantity:Price:$75.95Subtotal: -
Cylinder Works Big Bore Gasket Kit for 2009-2016 Kawasaki KX250F 31004-G01
CYLINDER WORKS
$92.95When you're pushing your KX250F to its limits, factory tolerances become your biggest constraint. The Cylinder Works Big Bore Gasket Kit delivers measurable displacement gains and improved combustion...09341929- SKU:
- 09341929
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE METRIC:
- OVERSIZED (+3.00 MM)
- MATERIAL:
- NICKEL SILICON CARBIDE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- UNITS:
- KIT
- TYPE:
- TOP END
$92.95Qty in Cart: 0Quantity:Price:$92.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - KTM P400270850019
ATHENA
MSRP: $150.95Now: $129.00Was: $150.95A complete engine rebuild demands gaskets that can handle extreme temperatures and sustained pressure without compromise. Athena's engineering ensures reliable sealing across all critical surfaces,...09341819- SKU:
- 09341819
- Availability:
- Ships Same Business Day
- Weight:
- 0.49 LBS
- RIDING STYLE:
- STREET
- TYPE:
- COMPLETE
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
MSRP: $150.95Now: $129.00Was: $150.95 -
On Sale
ATHENA Top End Gasket Kit P400270600220/1
ATHENA
MSRP: $51.95Now: $47.00Was: $51.95A top-end gasket kit is essential maintenance for any racer looking to extend engine life and maintain peak performance between rebuilds. The ATHENA P400270600220/1 gives you the flexibility to run...09340234- SKU:
- 09340234
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 2-STROKE
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $51.95Now: $47.00Was: $51.95Qty in Cart: 0Quantity:Price:MSRP: $51.95Now: $47.00Was: $51.95Subtotal: -
COMETIC Bottom End Gasket Set - Honda C3322
COMETIC
$38.95A quality bottom end gasket set is non-negotiable when rebuilding or refreshing your engine—cheap seals lead to oil leaks, contamination, and catastrophic failures. The COMETIC C3322 delivers...09344143- SKU:
- 09344143
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- MODEL:
- HI-PERFORMANCE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 71.00 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
$38.95 -
PROX Top End Gasket Set - Yamaha 35.2418
PROX
$69.95A quality top-end gasket set is essential for maintaining compression integrity and preventing costly oil leaks between cylinder head and block surfaces. PROX's gasket sets are engineered to OEM...09345708- SKU:
- 09345708
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
$69.95Qty in Cart: 0Quantity:Price:$69.95Subtotal: -
PROX Top End Gasket Set - Suzuki 35.3122
PROX
$22.95A quality top end gasket set is critical for maintaining compression, preventing oil leaks, and ensuring reliable engine sealing in high-performance applications. The PROX 35.3122 delivers...09345717- SKU:
- 09345717
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
$22.95 -
PROX Top End Gasket Set - Suzuki 35.3311
PROX
$34.95A top-end gasket set is essential maintenance for any engine rebuild or head service—it's the barrier that prevents combustion pressure and coolant from leaking past critical sealing points. The PROX...09345728- SKU:
- 09345728
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
$34.95Qty in Cart: 0Quantity:Price:$34.95Subtotal: -
On Sale
PROX Top End Gasket Set - Suzuki 35.3337
PROX
MSRP: $69.95Now: $45.00Was: $69.95A degraded top end gasket set compromises seal integrity, leading to coolant leaks, oil seepage, and potential engine damage. PROX gaskets are engineered to OEM specifications, ensuring reliable...09345737- SKU:
- 09345737
- 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: $45.00Was: $69.95Qty in Cart: 0Quantity:Price:MSRP: $69.95Now: $45.00Was: $69.95Subtotal: -
PROX Top End Gasket Set - Kawasaki 35.4215
PROX
$39.95A quality top-end gasket set is essential for maintaining compression integrity and preventing oil leakage in high-performance applications. The PROX 35.4215 gasket set is engineered to OEM...09345756- SKU:
- 09345756
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET SET
- TYPE:
- TOP END
- UNITS:
- SET
$39.95Qty in Cart: 0Quantity:Price:$39.95Subtotal: -
PROX Top End Gasket Set - Kawasaki 35.4409
PROX
$44.95A properly sealed top end is the foundation of reliable engine performance, and PROX gasket sets deliver OEM-quality sealing with precision engineering. Whether you're rebuilding after a full...09345770- SKU:
- 09345770
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$44.95Qty in Cart: 0Quantity:Price:$44.95Subtotal: -
PROX Top End Gasket Set - KTM 35.6103
PROX
$29.95A properly sealed top end is critical for maintaining combustion integrity and preventing costly oil leaks that compromise performance and engine longevity. PROX Top End Gasket Sets are engineered to...09345776- SKU:
- 09345776
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
$29.95Qty in Cart: 0Quantity:Price:$29.95Subtotal: -
PROX Top End Gasket Set - KTM 35.6248
PROX
$29.95A quality top-end gasket set is critical for maintaining compression, preventing oil seepage, and ensuring reliable engine performance between rebuilds. PROX gaskets are engineered to OEM...09345783- SKU:
- 09345783
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET SET
- UNITS:
- SET
$29.95Qty in Cart: 0Quantity:Price:$29.95Subtotal: -
PROX Water Pump Rebuild Kit - Honda 57.1422
PROX
$36.95A failing water pump can compromise cooling system integrity and lead to catastrophic engine damage. The PROX Water Pump Rebuild Kit restores OEM performance with precision-engineered components,...09346993- SKU:
- 09346993
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$36.95 -
PROX Water Pump Rebuild Kit - Honda 57.1515
PROX
$39.95A failing water pump compromises engine cooling efficiency and risks catastrophic overheating—especially under racing conditions or sustained high-performance driving. The PROX Water Pump Rebuild Kit...09347000- SKU:
- 09347000
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$39.95Qty in Cart: 0Quantity:Price:$39.95Subtotal: -
PROX Water Pump Rebuild Kit - Suzuki 57.3425
PROX
$34.95A failing water pump compromises your engine's cooling system and puts your entire build at risk. This PROX rebuild kit gives you OEM-quality replacement components without the downtime and expense...09347035- SKU:
- 09347035
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$34.95Qty in Cart: 0Quantity:Price:$34.95Subtotal:
