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 - Suzuki P400510600099
ATHENA
MSRP: $72.95Now: $66.00Was: $72.95Engine gaskets are critical sealing components that degrade with heat cycles and wear, directly impacting compression integrity and power output. The ATHENA Top End Gasket Kit gives you the flexibility to optimize your compression ratio for your fuel...09347508- SKU:
- 09347508
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
MSRP: $72.95Now: $66.00Was: $72.95Qty in Cart: 0Quantity:Price:MSRP: $72.95Now: $66.00Was: $72.95Subtotal: -
Cylinder Works Big Bore Gasket Kit 80mm Bore Yamaha YZ250F 2019 CW21013G01
CYLINDER WORKS
$101.95A worn or damaged top-end gasket kit compromises combustion chamber sealing, leading to compression loss and reduced power output. The Cylinder Works Big Bore Gasket Kit ensures a precision fit for your 80mm bore YZ250F, restoring optimal compression and...09347521- SKU:
- 09347521
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$101.95Qty in Cart: 0Quantity:Price:$101.95Subtotal: -
On Sale
PROX Top End Gasket Set - Kawasaki 35.4351
PROX
MSRP: $78.95Now: $64.00Was: $78.95A top-end rebuild demands precision gasket sealing—any leak or failure undermines your entire cylinder head work and costs you performance. The PROX Top End Gasket Set delivers OEM-grade sealing surfaces manufactured to exact specifications, ensuring...09347769- SKU:
- 09347769
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $78.95Now: $64.00Was: $78.95 -
On Sale
PROX Top End Gasket Set - Gas Gas/Husqvarna/KTM 35.6343
PROX
MSRP: $93.95Now: $76.00Was: $93.95Top-end gasket failures compromise cylinder sealing and allow combustion blow-by, robbing your engine of power and reliability. Whether you're rebuilding after a season of hard riding or performing preventive maintenance, a quality gasket set is...09347772- SKU:
- 09347772
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
MSRP: $93.95Now: $76.00Was: $93.95 -
On Sale
PROX Top End Gasket Set - Gas Gas/Husqvarna/KTM 35.6439
PROX
MSRP: $99.95Now: $81.00Was: $99.95A top-end rebuild demands gasket integrity—any leak compromises compression and performance. The PROX Top End Gasket Set delivers OEM-equivalent sealing across all critical combustion chamber interfaces, manufactured to exacting specifications for Gas...09347777- SKU:
- 09347777
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
MSRP: $99.95Now: $81.00Was: $99.95 -
VERTEX Top End Gasket Kit - Gas Gas/Husqvarna/KTM 810991
VERTEX
$101.25A leaking or deteriorating top-end gasket can silently drain your engine's performance and lead to costly damage if left unchecked. This VERTEX gasket kit delivers OEM-quality sealing across all critical top-end surfaces, keeping compression where it...09348014- SKU:
- 09348014
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
$101.25 -
WINDEROSA Top End Gasket Kit - Kawasaki 440 610101
WINDEROSA
$46.75A leaking top end gasket kit compromises combustion efficiency and invites coolant or oil contamination into your Kawasaki 440 engine—exactly what you don't need mid-season. The WINDEROSA 610101 addresses this with a complete seal solution, restoring...PD812305- SKU:
- PD812305
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
$46.75Qty in Cart: 0Quantity:Price:$46.75Subtotal: -
WINDEROSA Top End Gasket Kit - Kawasaki 550 610103
WINDEROSA
$51.03A top-end gasket kit is essential maintenance for any Kawasaki 550/610 engine—worn gaskets lead to compression loss, oil seepage, and decreased performance. WINDEROSA's comprehensive kit addresses all critical sealing points, ensuring your engine...PD812325- SKU:
- PD812325
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$51.03 -
WINDEROSA Top End Gasket Kit - Raider 701 610602
WINDEROSA
$67.95A failed top-end gasket can compromise your engine's compression and introduce coolant or oil contamination into the combustion chamber—both catastrophic for performance and engine longevity. The WINDEROSA Top End Gasket Kit delivers OEM-quality sealing...PD812532- SKU:
- PD812532
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$67.95 -
WINDEROSA Gasket - Complete - JS800SXR 611409
WINDEROSA
$127.95A complete gasket set is essential for any engine rebuild or overhaul on your JS800SXR—preventing oil leaks, coolant seepage, and combustion gas escape that compromise performance and reliability. Whether you're refreshing a high-mileage engine or...09346560- 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 Standard Bore Gasket Kit 810213
WINDEROSA
$68.55Engine wear compromises both reliability and performance—cylinder bore degradation leads to compression loss, increased blowby, and accelerated piston wear. The WINDEROSA Standard Bore Gasket Kit 810213 delivers a complete, bolt-on cylinder solution that...09341930- SKU:
- 09341930
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE METRIC:
- 66.00 MM
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- STANDARD
- TYPE:
- TOP END
- MATERIAL:
- NICKEL SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$68.55Qty in Cart: 0Quantity:Price:$68.55Subtotal: -
WINDEROSA Gasket - Complete - JT1500 Ultra 611420
WINDEROSA
$362.94A complete gasket set is the foundation of engine reliability and performance. When you're rebuilding or servicing your JT1500 Ultra, using OEM-specification gaskets ensures proper sealing, prevents fluid leakage, and maintains compression integrity...09346564- SKU:
- 09346564
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$362.94Qty in Cart: 0Quantity:Price:$362.94Subtotal: -
WINDEROSA Gasket Kit - Standard Bore 810373
WINDEROSA
$71.97A complete gasket kit is essential for any engine rebuild or top-end refresh—it ensures reliable sealing across all critical surfaces and prevents costly coolant and oil leaks that compromise performance and engine longevity. The WINDEROSA Gasket Kit...09346009- SKU:
- 09346009
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE IMPERIAL:
- STANDARD
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CYLINDER
- UNITS:
- KIT
$71.97 -
MOOSE RACING Motor Gasket Kit with Seal - 125SX 811330
MOOSE RACING
$121.59A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your work—OEM-quality components at a fraction of dealership pricing. This Moose Racing kit eliminates the hassle of sourcing individual gasket sets...09341268- SKU:
- 09341268
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- TYPE:
- COMPLETE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$121.59 -
MOOSE RACING Inner Clutch Cover Gasket 816213
MOOSE RACING
$13.18A leaking clutch cover gasket compromises engine sealing and invites oil loss—replacing it is essential maintenance for any rebuild or repair. This Moose Racing gasket delivers OEM-equivalent fitment and reliability at a fraction of OEM pricing, so you...09346127- SKU:
- 09346127
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$13.18 -
MOOSE RACING Clutch Cover Gasket 817826
MOOSE RACING
$8.88A leaking clutch cover gasket compromises engine reliability and creates messy maintenance headaches. The Moose Racing 817826 replacement gasket seals with precision while withstanding thermal cycling and pressure demands, letting you rebuild with...09341460- SKU:
- 09341460
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$8.88 -
MOOSE RACING Motor Gasket Kit with Seal - RMZ/KXF 811463
MOOSE RACING
$155.07A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work or your wallet. This Moose Racing kit eliminates the hassle of sourcing individual components by bundling everything you need in one...09341480- SKU:
- 09341480
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
$155.07 -
MOOSE RACING Motor Gasket Kit with Seal - 300SX/EXC 811326
MOOSE RACING
$54.94A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work or your wallet. The MOOSE RACING Motor Gasket Kit delivers OEM-quality replacement seals at a fraction of the cost, allowing you to rebuild...09340482- SKU:
- 09340482
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
$54.94Qty in Cart: 0Quantity:Price:$54.94Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - CRF450X 808276
MOOSE RACING
$200.16A complete engine and transmission rebuild demands precision gasket fit and material reliability—shortcuts here lead to leaks, compression loss, and costly downtime. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-equivalent performance at a...09340969- SKU:
- 09340969
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$200.16Qty in Cart: 0Quantity:Price:$200.16Subtotal: -
MOOSE RACING Top End Gasket Kit - Yamaha 810691
MOOSE RACING
$64.22A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or your wallet. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, allowing you to restore your engine with...09344776- SKU:
- 09344776
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$64.22Qty in Cart: 0Quantity:Price:$64.22Subtotal:
