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
-
MOOSE RACING Top End Gasket Kit - TTR90 810616
MOOSE RACING
$42.99When you're rebuilding a TTR90 top end, precision gaskets and seals are non-negotiable—they're the difference between a bulletproof engine and a leaking headache. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals at a fraction of OEM...09340872- SKU:
- 09340872
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$42.99 -
MOOSE RACING Motor Gasket Kit with Seal - TTR 811616
MOOSE RACING
$80.18A complete engine and transmission rebuild demands precision-fit gaskets and seals—compromises here lead to leaks, performance loss, and costly rework. The MOOSE RACING Motor Gasket Kit delivers OEM-quality components at a fraction of OEM pricing, giving...09340873- SKU:
- 09340873
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- COMPLETE
$80.18 -
MOOSE RACING Motor Gasket Kit with Seal - KX 811418
MOOSE RACING
$90.04Engine and transmission rebuilds demand precision-fit gaskets and seals that won't compromise your build's integrity or longevity. OEM replacement components come with premium price tags—MOOSE Racing delivers the same quality standards at a fraction of...09340876- SKU:
- 09340876
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$90.04 -
MOOSE RACING Top End Gasket Kit - YZ250 810669
MOOSE RACING
$31.10A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or your wallet. This MOOSE RACING kit gives you every component needed for a complete top-end refresh—from valve seals to base gaskets—using OEM-grade...09341516- SKU:
- 09341516
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$31.10 -
MOOSE RACING Head Cover Gasket - YZ/WR450 817853
MOOSE RACING
$32.09A head cover gasket failure means oil leaks, potential engine contamination, and costly downtime. The OEM gasket carries premium pricing despite being a routine maintenance item—Moose Racing delivers genuine-quality seals at a fraction of the cost, so...09341469- SKU:
- 09341469
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- MATERIAL:
- RUBBER
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- HEAD COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$32.09 -
MOOSE RACING Head Cover Gasket - YZ/WR450 817854
MOOSE RACING
$32.72A leaking head cover gasket compromises engine sealing and invites oil seepage into critical engine bay areas. Moose Racing's OEM-equivalent gasket delivers the durability and precision fit of factory seals without the OEM price tag, allowing you to...09341470- SKU:
- 09341470
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- MATERIAL:
- RUBBER
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- HEAD COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$32.72 -
MOOSE RACING Head Cover Gasket - KX450F 817855
MOOSE RACING
$30.91A leaking head cover gasket compromises engine sealing and invites oil contamination into your top-end—exactly what you don't need during competition or trail riding. MOOSE RACING's OEM-equivalent gasket delivers the durability and precision fit of...09341471- SKU:
- 09341471
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- MATERIAL:
- RUBBER
- TYPE:
- HEAD COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$30.91Qty in Cart: 0Quantity:Price:$30.91Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - CRF250 811262
MOOSE RACING
$180.42A full engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—and OEM replacements often carry premium pricing. The MOOSE RACING Motor Gasket Kit delivers genuine-quality seals and gaskets at a fraction of...09341475- SKU:
- 09341475
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
$180.42 -
MOOSE RACING Motor Gasket Kit with Seal - CRF450R 811267
MOOSE RACING
$162.80A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your build's integrity or your budget. This Moose Racing kit delivers OEM-quality components at a fraction of dealership pricing, letting you rebuild...09341476- SKU:
- 09341476
- Availability:
- Ships Same Business Day
- Weight:
- 0.43 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
$162.80 -
MOOSE RACING Motor Gasket Kit with Sea - CRF450X 811276
MOOSE RACING
$234.98A complete engine and transmission rebuild demands precision-fit gaskets and seals—OEM quality components that won't compromise your work or drain your budget. MOOSE Racing delivers genuine replacement seals paired with U.S.-manufactured gaskets...09341477- SKU:
- 09341477
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$234.98 -
MOOSE RACING Motor Gasket Kit with Seal - KX250F 811468
MOOSE RACING
$175.51A complete engine and transmission rebuild demands precision-fit gaskets and seals—cheap replacements lead to leaks, performance loss, and costly rework. The MOOSE RACING Motor Gasket Kit delivers OEM-equivalent quality at a fraction of dealer pricing,...09341478- SKU:
- 09341478
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$175.51Qty in Cart: 0Quantity:Price:$175.51Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KX450F 811469
MOOSE RACING
$201.76A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or your wallet. The MOOSE RACING Motor Gasket Kit eliminates the frustration of sourcing individual components while delivering OEM-quality...09341479- SKU:
- 09341479
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$201.76 -
MOOSE RACING Motor Gasket Kit with Seal - RMZ250 811568
MOOSE RACING
$165.87A complete engine and transmission rebuild demands precision-fit gaskets and seals—and OEM replacements come with OEM pricing. The MOOSE RACING Motor Gasket Kit delivers genuine OEM-quality oil seals paired with durable gasket sets at a fraction of...09341481- SKU:
- 09341481
- Availability:
- Ships Same Business Day
- Weight:
- 0.47 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$165.87Qty in Cart: 0Quantity:Price:$165.87Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - DRZ400 811585
MOOSE RACING
$134.06A complete engine and transmission gasket rebuild shouldn't require sourcing parts from multiple suppliers or paying OEM markup prices. This MOOSE RACING Motor Gasket Kit delivers every seal and gasket you need for a full bottom-end refresh, engineered...09341482- SKU:
- 09341482
- Availability:
- Ships Same Business Day
- Weight:
- 0.47 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- COMPLETE
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
$134.06 -
MOOSE RACING Motor Gasket Kit with Seal - RMZ450 811590
MOOSE RACING
$129.70A complete engine and transmission rebuild demands precision-fit gaskets and seals—compromising here invites oil leaks, compression loss, and premature failure. MOOSE Racing delivers OEM-equivalent performance at a fraction of factory pricing, letting...09341483- SKU:
- 09341483
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
$129.70 -
MOOSE RACING Clutch Cover Gasket 817251
MOOSE RACING
$12.66A leaking clutch cover gasket can compromise engine sealing and lead to costly oil loss during critical racing or driving conditions. The MOOSE RACING 817251 clutch cover gasket delivers OEM-equivalent sealing performance at a fraction of OEM pricing,...M817251- SKU:
- M817251
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- CLUTCH COVER
$12.66 -
MOOSE RACING Clutch Cover Gasket 817252
MOOSE RACING
$6.75A leaking clutch cover gasket compromises engine sealing and can lead to oil loss and contamination—exactly what you don't want mid-race or mid-rebuild. The MOOSE RACING Clutch Cover Gasket delivers OEM-equivalent sealing performance at a fraction of the...M817252- SKU:
- M817252
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$6.75 -
MOOSE RACING Clutch Cover Gasket 817402
MOOSE RACING
$7.89A leaking clutch cover gasket will compromise engine integrity and create messy drips on your garage floor. The MOOSE RACING 817402 is a precision-engineered OEM replacement that seals reliably without the premium price tag of factory parts. Whether...M817402- SKU:
- M817402
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$7.89Qty in Cart: 0Quantity:Price:$7.89Subtotal: -
MOOSE RACING Clutch Cover Gasket 817450
MOOSE RACING
$6.84A leaking clutch cover gasket compromises engine reliability and invites costly oil seepage into your ignition system. The MOOSE RACING Clutch Cover Gasket 817450 delivers precise fitment and high-tech sealing materials that prevent oil loss while...M817450- SKU:
- M817450
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$6.84Qty in Cart: 0Quantity:Price:$6.84Subtotal: -
MOOSE RACING Clutch Cover Gasket 817461
MOOSE RACING
$7.28A leaking clutch cover gasket compromises engine sealing and can lead to oil weepage that damages surrounding components. This MOOSE RACING replacement gasket restores OEM-level sealing integrity without the OEM price tag, making it an economical choice...M817461- SKU:
- M817461
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- CLUTCH COVER
$7.28
