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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MOOSE RACING Top End Gasket Kit - RM 80 810500
MOOSE RACING
$17.46A top-end rebuild demands precision gaskets and seals that won't fail under combustion pressure or thermal cycling. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of dealer pricing, letting you confidently restore your...M810500- SKU:
- M810500
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$17.46 -
MOOSE RACING Top End Gasket Kit - RM 80 810501
MOOSE RACING
$18.96A top-end rebuild demands precision-fit gaskets and seals that won't compromise your engine's integrity or performance. The MOOSE RACING Top End Gasket Kit delivers OEM-quality replacement seals at a fraction of OEM pricing, so you can confidently...M810501- SKU:
- M810501
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$18.96 -
MOOSE RACING Top End Gasket Kit - RM 80 810502
MOOSE RACING
$21.90A quality top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit eliminates the guesswork and expense of sourcing individual components, giving you every seal...M810502- SKU:
- M810502
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$21.90Qty in Cart: 0Quantity:Price:$21.90Subtotal: -
MOOSE RACING Top End Gasket Kit - RM 80 810504
MOOSE RACING
$18.96A top-end rebuild demands precision and reliability—this gasket kit delivers both without the OEM price tag. Moose Racing engineered every seal and gasket to exact specifications, so you can confidently reassemble your engine knowing each component is...M810504- SKU:
- M810504
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$18.96Qty in Cart: 0Quantity:Price:$18.96Subtotal: -
MOOSE RACING Top End Gasket Kit - RM 85 810505
MOOSE RACING
$21.90A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the price, letting you refresh your RM 85 with...M810505- SKU:
- M810505
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$21.90 -
MOOSE RACING Top End Gasket Kit - RM 125 810540
MOOSE RACING
$17.46A quality top-end gasket kit is essential when rebuilding your RM 125—it seals combustion chambers, prevents oil leakage, and ensures your freshly rebuilt engine performs reliably from day one. Moose Racing delivers genuine OEM replacement seals paired...M810540- SKU:
- M810540
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$17.46Qty in Cart: 0Quantity:Price:$17.46Subtotal: -
MOOSE RACING Top End Gasket Kit - RM 125 810542
MOOSE RACING
$26.26When you're rebuilding a top end, you need gaskets and seals you can trust to hold up under boost and heat. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent quality at a fraction of the cost, letting you spend your budget where it counts—on...M810542- SKU:
- M810542
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$26.26 -
MOOSE RACING Top End Gasket Kit - RM 125 810543
MOOSE RACING
$29.14A top-end rebuild demands precision gaskets and seals that won't let you down mid-season. The MOOSE RACING Top End Gasket Kit eliminates guesswork by including every component you need for a complete, reliable engine refresh—all manufactured domestically...M810543- SKU:
- M810543
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$29.14 -
MOOSE RACING Motor Gasket Kit with Seal - XR400 811265
MOOSE RACING
$120.99A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise on fitment or durability. MOOSE Racing delivers OEM-quality replacement seals at a fraction of the cost, eliminating the need to source components...M811265- SKU:
- M811265
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$120.99Qty in Cart: 0Quantity:Price:$120.99Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - XR400 811266
MOOSE RACING
$112.56A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your work. MOOSE Racing delivers OEM-equivalent quality at a fraction of the cost, with every component engineered for accurate fit and long-term...M811266- SKU:
- M811266
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$112.56Qty in Cart: 0Quantity:Price:$112.56Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - CR500 811273
MOOSE RACING
$83.52A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your CR500's integrity or reliability. OEM replacement parts command premium prices, but this Moose Racing kit delivers genuine-quality components at a...M811273- SKU:
- M811273
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$83.52 -
MOOSE RACING Motor Gasket Kit with Seal - XR600 811280
MOOSE RACING
$122.00A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—OEM-spec components at a fraction of dealership pricing. This Moose Racing kit eliminates the frustration of sourcing individual seals and...M811280- SKU:
- M811280
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KX125 811420
MOOSE RACING
$66.13A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work. MOOSE Racing delivers OEM-quality replacement seals at a fraction of the cost, so you can rebuild with confidence without sacrificing...M811420- SKU:
- M811420
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$66.13Qty in Cart: 0Quantity:Price:$66.13Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KX125 811424
MOOSE RACING
$70.33Engine and transmission rebuilds demand precision—using substandard gaskets and seals invites leaks, performance loss, and costly failures down the line. This Moose Racing Motor Gasket Kit delivers OEM-quality components at a fraction of OEM pricing,...M811424- SKU:
- M811424
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$70.33 -
MOOSE RACING Top End Gasket Kit - KLX 810460
MOOSE RACING
$36.47A top-end rebuild demands precision—and cutting corners on gaskets and seals invites leaks, compression loss, and premature failure. The MOOSE RACING Top End Gasket Kit delivers every component you need for a complete, reliable rebuild at a fraction of...09346109- SKU:
- 09346109
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- TOP END
$36.47 -
MOOSE RACING Top End Gasket Kit - YZ450F 810997
MOOSE RACING
$87.72A top-end rebuild demands gaskets and seals that match OEM precision without the OEM price tag. The MOOSE RACING Top End Gasket Kit delivers U.S.-manufactured components engineered for reliability and accurate fitment, so you can confidently reassemble...09346110- SKU:
- 09346110
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET
$87.72 -
MOOSE RACING Complete Motor Gasket Kit with Seals - Honda 811248
MOOSE RACING
$91.46A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—this kit eliminates the tedious sourcing of individual components while delivering OEM-quality reliability at a fraction of the cost. Whether...09346111- SKU:
- 09346111
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$91.46Qty in Cart: 0Quantity:Price:$91.46Subtotal: -
MOOSE RACING Complete Motor Gasket Kit with Seals - Suzuki 811983
MOOSE RACING
$182.97A complete engine and transmission rebuild demands precision-fit gaskets and seals—factory OEM replacements that won't compromise your work. The MOOSE RACING Complete Motor Gasket Kit eliminates the tedious sourcing of individual components while...09346112- SKU:
- 09346112
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
$182.97 -
MOOSE RACING Complete Motor Gasket Kit with Seals - Yamaha 811997
MOOSE RACING
$172.74A complete engine rebuild requires precision gaskets and seals that maintain proper compression and prevent fluid leakage—compromises here lead to performance loss and costly damage. The MOOSE RACING Complete Motor Gasket Kit eliminates guesswork by...09346113- SKU:
- 09346113
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- ENGINE
$172.74 -
MOOSE RACING Motor Gasket Kit with Seal - CR125 811235
MOOSE RACING
$74.29A complete engine and transmission rebuild demands gaskets and seals that fit precisely and hold up under load—and OEM replacements can drain your budget fast. This Moose Racing Motor Gasket Kit delivers genuine OEM-quality seals at a fraction of the...M811235- SKU:
- M811235
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$74.29
