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: $58.95Now: $53.00Was: $58.95A 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 you the flexibility to run standard fuel with stock...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: $58.95Now: $53.00Was: $58.95Qty in Cart: 0Quantity:Price:MSRP: $58.95Now: $53.00Was: $58.95Subtotal: -
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 C3299 Bottom End Gasket Set delivers OEM-specification...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 combines multi-layered steel construction with proprietary...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 (MLS) construction with EST (Extreme Sealing...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 11007-G01 is engineered to bolt on, maintain factory...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 efficiency without requiring engine teardown or...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: $142.95Now: $129.00Was: $142.95A 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, eliminating the risk of compression loss or fluid...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: $142.95Now: $129.00Was: $142.95 -
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 either standard pump gas with stock compression or step...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 OEM-equivalent engineering with precision materials designed...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 specifications with premium materials that withstand high...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 OEM-equivalent durability with proven gasket materials engineered...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
$22.95Qty in Cart: 0Quantity:Price:$22.95Subtotal: -
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 35.3311 delivers OEM-equivalent sealing performance...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 sealing under sustained high-RPM loads and thermal cycling...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 specifications, ensuring reliable sealing across all critical...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 tear-down or refreshing a high-mileage engine, this gasket set...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 OEM specifications, ensuring perfect sealing surfaces...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 specifications, delivering consistent sealing across multiple heat...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, eliminating leaks and ensuring reliable thermal management...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 gives you OEM-equivalent components at a fraction of...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 of a full pump replacement. Get your Suzuki back to peak...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:
