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
ATHENA Top End Gasket Kit - Yamaha P400485600053
ATHENA
MSRP: $96.95Now: $87.00Was: $96.95Engine performance hinges on precision gasket sealing, and the ATHENA Top End Gasket Kit delivers the reliability competitive riders demand when refreshing their powerplant before race season or...09342580- SKU:
- 09342580
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- UNITS:
- KIT
- TYPE:
- TOP END
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
MSRP: $96.95Now: $87.00Was: $96.95Qty in Cart: 0Quantity:Price:MSRP: $96.95Now: $87.00Was: $96.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Kawasaki P400250600047
ATHENA
MSRP: $91.95Now: $78.00Was: $91.95Engine freshening before a race requires precision components that won't compromise reliability when it matters most. The ATHENA Top End Gasket Kit delivers OEM-quality sealing for pro, semi-pro, and...09342577- SKU:
- 09342577
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $91.95Now: $78.00Was: $91.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600064
ATHENA
MSRP: $86.95Now: $78.00Was: $86.95Whether you're prepping for race day or executing a midseason engine refresh, the ATHENA Top End Gasket Kit delivers the precision sealing your engine demands. This kit gives you flexibility—run...09342574- SKU:
- 09342574
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $86.95Now: $78.00Was: $86.95Qty in Cart: 0Quantity:Price:MSRP: $86.95Now: $78.00Was: $86.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600239
ATHENA
MSRP: $102.95Now: $93.00Was: $102.95Whether you're prepping for race day or executing a midseason engine refresh, the ATHENA Top End Gasket Kit ensures a proper seal on your Honda's critical combustion chamber surfaces. This kit gives...09342573- SKU:
- 09342573
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $102.95Now: $93.00Was: $102.95 -
On Sale
ATHENA Gasket Kit - YZ450F P400485160025
ATHENA
MSRP: $98.95Now: $89.00Was: $98.95The ATHENA Gasket Kit delivers the reliability and thermal management your YZ450F demands when you're pushing peak performance. Built with precision-engineered components and premium coatings, this...09342555- SKU:
- 09342555
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE:
- 102,00 MM
- BORE SIZE METRIC:
- 102.00 MM
MSRP: $98.95Now: $89.00Was: $98.95Qty in Cart: 0Quantity:Price:MSRP: $98.95Now: $89.00Was: $98.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850187
ATHENA
MSRP: $103.95Now: $89.00Was: $103.95A complete top-end rebuild demands gaskets that can handle extreme temperatures and maintain compression cycle after cycle. The ATHENA Complete Gasket Kit delivers the reliability you need with...09342542- SKU:
- 09342542
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- ENGINE TYPE:
- -
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $103.95Now: $89.00Was: $103.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600245
ATHENA
MSRP: $69.95Now: $63.00Was: $69.95Engine gasket integrity is critical to maintaining peak compression and preventing mid-race failures. The ATHENA Top End Gasket Kit gives you the flexibility to optimize your fuel strategy—run pump...09342537- SKU:
- 09342537
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
MSRP: $69.95Now: $63.00Was: $69.95Qty in Cart: 0Quantity:Price:MSRP: $69.95Now: $63.00Was: $69.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Suzuki P400510600098
ATHENA
MSRP: $73.95Now: $67.00Was: $73.95Engine freshening before race season requires precision-engineered gaskets that can handle varying fuel grades and compression ratios without compromise. The ATHENA Top End Gasket Kit gives you the...09342536- SKU:
- 09342536
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $73.95Now: $67.00Was: $73.95 -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600039
ATHENA
MSRP: $79.95Now: $72.00Was: $79.95When you're preparing for race day, a fresh top end is non-negotiable. The ATHENA Top End Gasket Kit gives you the flexibility to optimize your engine for either pump gas with stock compression or...09342534- SKU:
- 09342534
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
MSRP: $79.95Now: $72.00Was: $79.95 -
On Sale
ATHENA Top End Gasket Kit - Kawasaki P400250600024
ATHENA
MSRP: $91.95Now: $78.00Was: $91.95A top-end gasket kit is essential maintenance for any engine rebuild or mid-season refresh, especially when you're preparing for race day. The ATHENA P400250600024 gives you the flexibility to run...09342533- SKU:
- 09342533
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- TOP END
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $91.95Now: $78.00Was: $91.95 -
K&S TECHNOLOGIES Water Pump Repair Kit 75-6001
K&S TECHNOLOGIES
$20.95A failing water pump can quickly turn a race day into a costly disaster. This K&S Technologies repair kit gives you everything needed to restore your pump to factory specifications without replacing...09342527- SKU:
- 09342527
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
$20.95Qty in Cart: 0Quantity:Price:$20.95Subtotal: -
On Sale
COMETIC Top End Gasket Set C3174-EST
COMETIC
MSRP: $91.95Now: $82.76Was: $91.95A failing head gasket will leave you stranded, and factory gaskets simply can't handle the pressures of high-output 4-stroke engines. The COMETIC C3174-EST Top End Gasket Set uses multi-layered steel...09342432- SKU:
- 09342432
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 77.00 MM
- PRODUCT NAME:
- GASKET KIT
MSRP: $91.95Now: $82.76Was: $91.95Qty in Cart: 0Quantity:Price:MSRP: $91.95Now: $82.76Was: $91.95Subtotal: -
On Sale
COMETIC Top End Gasket Set C3268-EST
COMETIC
MSRP: $84.95Now: $76.46Was: $84.95A failing head gasket can cost you an entire season. The COMETIC C3268-EST Top End Gasket Set uses multi-layered steel construction with Viton rubber coating to handle extreme cylinder...09342420- SKU:
- 09342420
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE METRIC:
- 96.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
MSRP: $84.95Now: $76.46Was: $84.95Qty in Cart: 0Quantity:Price:MSRP: $84.95Now: $76.46Was: $84.95Subtotal: -
On Sale
COMETIC Top End Gasket Set C3267-EST
COMETIC
MSRP: $91.95Now: $82.76Was: $91.95High-output 4-stroke engines demand gasket technology that can withstand extreme combustion pressures and heat cycles without compromising the seal. COMETIC's EST gasket set uses multi-layered steel...09342414- SKU:
- 09342414
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE METRIC:
- 78.00 MM
- TYPE:
- TOP END
MSRP: $91.95Now: $82.76Was: $91.95Qty in Cart: 0Quantity:Price:MSRP: $91.95Now: $82.76Was: $91.95Subtotal: -
On Sale
COMETIC Top End Gasket Set C7924-EST
COMETIC
MSRP: $98.95Now: $89.06Was: $98.95If you're running a high-output 4-stroke engine—whether naturally aspirated or boosted—a quality gasket set is non-negotiable for reliability and performance. The COMETIC C7924-EST combines...09342410- SKU:
- 09342410
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- BORE SIZE METRIC:
- 87.00 MM
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $98.95Now: $89.06Was: $98.95Qty in Cart: 0Quantity:Price:MSRP: $98.95Now: $89.06Was: $98.95Subtotal: -
On Sale
COMETIC Top End Gasket Set C3187-EST
COMETIC
MSRP: $64.95Now: $58.46Was: $64.95A quality top-end gasket set is non-negotiable for any engine rebuild or refresh—poor sealing leads to compression loss, oil weeping, and catastrophic failure under boost or high RPM. The COMETIC...09342405- SKU:
- 09342405
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 66.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
MSRP: $64.95Now: $58.46Was: $64.95 -
On Sale
COMETIC Top End Gasket Set C3416
COMETIC
MSRP: $44.95Now: $40.46Was: $44.95A failed head gasket can sideline your engine and drain your wallet fast. The COMETIC C3416 Top End Gasket Set uses multi-layered steel construction with Viton rubber coating to handle the extreme...09342395- SKU:
- 09342395
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 45.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
MSRP: $44.95Now: $40.46Was: $44.95 -
Cylinder Works Big Bore Gasket Kit Yamaha YFZ450 2004-2009 2012-2013 23001-G01
CYLINDER WORKS
$112.95When you're pushing your YFZ450 to its limits, stock cylinder components become your bottleneck. The Cylinder Works Big Bore Gasket Kit delivers measurable gains in displacement and power without...09342387- SKU:
- 09342387
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- UTV
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- BIG BORE
- UNITS:
- KIT
$112.95Qty in Cart: 0Quantity:Price:$112.95Subtotal: -
Cylinder Works Big Bore Gasket Kit 79mm Bore 2005-2012 KTM 250 SX-F 51002-G01
CYLINDER WORKS
$143.95If you're running a 2005-2012 KTM 250 SX-F and want measurable gains in displacement, durability, and reliability without extensive machine work, a big bore kit is the most direct path forward. This...09342370- SKU:
- 09342370
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MATERIAL:
- NICKEL SILICON CARBIDE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- BIG BORE
- UNITS:
- KIT
- TYPE:
- TOP END
$143.95 -
Cylinder Works Big Bore Gasket Kit KTM 350 SX-F 2011-2012 51001-G01
CYLINDER WORKS
$149.95If you're running a KTM 350 SX-F and looking to extract real performance gains, a big bore kit is one of the most effective bolt-on upgrades available. This Cylinder Works system delivers increased...09342369- SKU:
- 09342369
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- NICKEL SILICON CARBIDE
- STYLE:
- BIG BORE
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
$149.95
