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
-
WINDEROSA Gasket - Top End - 300 Ultra 610420
WINDEROSA
$214.70Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346554- SKU:
- 09346554
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$214.70 -
WINDEROSA Gasket - Top End - 310 Ultra 610421
WINDEROSA
$214.70Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346555- SKU:
- 09346555
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
$214.70 -
WINDEROSA Gasket - Top End - 800 WaveRunner 610607
WINDEROSA
$111.00Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346556- SKU:
- 09346556
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$111.00 -
WINDEROSA Gasket - Top End - Polaris 610812
WINDEROSA
$92.28Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346558- SKU:
- 09346558
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$92.28 -
WINDEROSA Gasket - Complete - JS800SXR 611409
WINDEROSA
$127.95WINDEROSA Gasket - Complete - JS800SXR09346560- SKU:
- 09346560
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ENGINE
- UNITS:
- KIT
$127.95Qty in Cart: 0Quantity:Price:$127.95Subtotal: -
WINDEROSA Gasket - Complete - Ultra 150 611411
WINDEROSA
$155.95WINDEROSA Gasket - Complete - Ultra 15009346561- SKU:
- 09346561
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ENGINE
- TYPE:
- COMPLETE
- UNITS:
- KIT
$155.95 -
WINDEROSA Complete Gasket Kit - Sea-Doo 611210
WINDEROSA
$171.50Full engine gasket set includes bases, heads, intakes and crankshaft oil seals, Made in the U.S.A.09342184- SKU:
- 09342184
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- UNITS:
- SET
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- COMPLETE
$171.50 -
WINDEROSA Top End Gasket Kit - Sea-Doo 610210
WINDEROSA
$139.50Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09342185- SKU:
- 09342185
- Availability:
- Ships Same Business Day
- Weight:
- 0.43 LBS
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
$139.50 -
WINDEROSA Carb Base Gasket - Keihin 38M 619127
WINDEROSA
$10.35Manufactured from compressed micropore material for ultimate sealing and durability, Replace worn or damaged base gaskets when doing a carb rebuild09342624- SKU:
- 09342624
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- CARBURETOR INTAKE
- BORE SIZE:
- 38,00 MM
- BORE SIZE METRIC:
- 38.00 MM
- MATERIAL:
- MICROPORE COMPOUND
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- RIDING STYLE:
- WATERCRAFT
- STYLE:
- KEIHIN
$10.35 -
WINDEROSA Carb Base Gasket - Keihin 40M 619128
WINDEROSA
$10.35Manufactured from compressed micropore material for ultimate sealing and durability, Replace worn or damaged base gaskets when doing a carb rebuild09342625- SKU:
- 09342625
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE:
- 40,00 MM
- PRODUCT NAME:
- GASKET
- TYPE:
- CARBURETOR INTAKE
- BORE SIZE METRIC:
- 40.00 MM
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- MICROPORE COMPOUND
- STYLE:
- KEIHIN
- UNITS:
- 10 PACK
$10.35 -
WINDEROSA Gasket - Top End - JS440 610102
WINDEROSA
$46.75Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346544- SKU:
- 09346544
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$46.75 -
WINDEROSA Gasket - Top End - GP1300 610107
WINDEROSA
$230.87Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346545- SKU:
- 09346545
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$230.87 -
WINDEROSA Gasket - Top End 610110
WINDEROSA
$13.95Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346546- SKU:
- 09346546
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
$13.95 -
WINDEROSA Gasket - Top End - 500 Jammer 610114
WINDEROSA
$16.95Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346547- SKU:
- 09346547
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$16.95 -
WINDEROSA Gasket - Top End - Jet Boat 610214
WINDEROSA
$52.95Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346548- SKU:
- 09346548
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
$52.95 -
WINDEROSA Gasket - Top End - 900 Ace 610216
WINDEROSA
$49.95Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346549- SKU:
- 09346549
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$49.95 -
WINDEROSA Gasket - Top End - JS800 610409
WINDEROSA
$104.45Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09346551- SKU:
- 09346551
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
$104.45 -
WINDEROSA Standard Bore Gasket Kit 810482
WINDEROSA
$83.48Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylinders, Cylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noise, Nickel Silicon Carbide plated for...09344055- SKU:
- 09344055
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- MATERIAL:
- NICKEL SILICON CARBIDE
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- STANDARD
$83.48 -
WINDEROSA Top End Gasket Kit - Sea-Doo 610211
WINDEROSA
$127.08Includes bases and heads, along with intake and exhaust gaskets (only those nearest the block), Made in the U.S.A.09342615- SKU:
- 09342615
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$127.08 -
WINDEROSA Complete Gasket Kit - Sea-Doo 611214
WINDEROSA
$268.95Full engine gasket set includes bases, heads, intakes and crankshaft oil seals, Made in the U.S.A.09342617- SKU:
- 09342617
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- PRODUCT NAME:
- GASKET SET
- TYPE:
- COMPLETE
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
$268.95
