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 - KX 100 810409
MOOSE RACING
$33.51A top-end rebuild demands precision gaskets and seals that won't compromise performance or reliability. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of dealer...M810409- SKU:
- M810409
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$33.51 -
MOOSE RACING Top End Gasket Kit - KX 80 810410
MOOSE RACING
$24.85Whether you're rebuilding after a piston replacement or maintaining peak compression, this gasket kit eliminates the guesswork and cost of sourcing individual seals and gaskets. Moose Racing delivers...M810410- SKU:
- M810410
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$24.85 -
MOOSE RACING Top End Gasket Kit - KX/RM100 810411
MOOSE RACING
$37.29When you're rebuilding a top end, every gasket and seal matters—cheap compromises lead to oil leaks, compression loss, and catastrophic failures. The MOOSE RACING Top End Gasket Kit gives you...M810411- SKU:
- M810411
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$37.29 -
MOOSE RACING Clutch Cover Gasket 817988
MOOSE RACING
$13.64A leaking clutch cover gasket compromises engine sealing and can lead to oil loss and contamination. The MOOSE RACING Clutch Cover Gasket 817988 delivers OEM-equivalent sealing performance at a...09345899- SKU:
- 09345899
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$13.64 -
MOOSE RACING Head Cover Gasket 819037
MOOSE RACING
$19.21A leaking valve cover gasket forces oil past its seal, compromising engine cleanliness and potentially damaging surrounding components. OEM replacements carry premium pricing for a simple elastomer...09345900- SKU:
- 09345900
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- HEAD COVER
- UNITS:
- EACH
$19.21Qty in Cart: 0Quantity:Price:$19.21Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KX80 811403
MOOSE RACING
$53.47A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your freshly machined components. MOOSE RACING delivers OEM-equivalent performance at a...M811403- SKU:
- M811403
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$53.47 -
MOOSE RACING Motor Gasket Kit with Seal - KX80 811404
MOOSE RACING
$56.32A complete engine and transmission rebuild demands precision gaskets and seals that fit right the first time—factory tolerances with aftermarket affordability. MOOSE Racing delivers OEM-equivalent...M811404- SKU:
- M811404
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$56.32Qty in Cart: 0Quantity:Price:$56.32Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KX80 811405
MOOSE RACING
$56.32A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your work or your budget. MOOSE Racing delivers OEM-equivalent performance at a fraction of...M811405- SKU:
- M811405
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$56.32Qty in Cart: 0Quantity:Price:$56.32Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KX/RM60 811407
MOOSE RACING
$52.05A complete engine and transmission rebuild requires precision components that won't compromise reliability or drain your budget. This Moose Racing gasket and seal kit delivers OEM-quality fitment at...M811407- SKU:
- M811407
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$52.05 -
MOOSE RACING Motor Gasket Kit with Seal - KX100 811409
MOOSE RACING
$78.83A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your engine's integrity or drain your wallet. MOOSE Racing's comprehensive gasket kit delivers...M811409- SKU:
- M811409
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$78.83 -
MOOSE RACING Motor Gasket Kit with Seal - KX/RM100 811411
MOOSE RACING
$80.18A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your work or wallet. MOOSE RACING's Motor Gasket Kit delivers genuine OEM-quality seals at a...M811411- SKU:
- M811411
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$80.18 -
MOOSE RACING Top End Gasket Kit - YZ 125 810634
MOOSE RACING
$24.85When you're rebuilding a YZ 125 top end, you need gaskets and seals engineered for precision and durability—not OEM pricing. The MOOSE RACING Top End Gasket Kit delivers complete coverage with U.S...M810634- SKU:
- M810634
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$24.85Qty in Cart: 0Quantity:Price:$24.85Subtotal: -
MOOSE RACING Top End Gasket Kit - YZ 125 810635
MOOSE RACING
$24.85A top-end rebuild demands precision seals and gaskets that won't compromise your engine's integrity or your wallet. The MOOSE RACING gasket kit eliminates the guesswork with a complete,...M810635- SKU:
- M810635
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$24.85 -
MOOSE RACING Top End Gasket Kit - YZ 125 810636
MOOSE RACING
$24.85A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or reliability. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction...M810636- SKU:
- M810636
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$24.85 -
MOOSE RACING Top End Gasket Kit - YZ 125 810637
MOOSE RACING
$24.85A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a...M810637- SKU:
- M810637
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$24.85 -
MOOSE RACING Top End Gasket Kit - YZ 125 810639
MOOSE RACING
$25.81A top-end rebuild demands precision and reliability—this gasket kit gives you OEM-quality seals at a fraction of the cost. Whether you're replacing a worn piston or raising compression, Moose Racing...M810639- SKU:
- M810639
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$25.81 -
MOOSE RACING Top End Gasket Kit - YZ 250 810660
MOOSE RACING
$29.14A top-end rebuild demands precision gaskets and seals that won't fail mid-season. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of dealership pricing, giving you...M810660- SKU:
- M810660
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$29.14Qty in Cart: 0Quantity:Price:$29.14Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - RM250 808582
MOOSE RACING
$83.24A complete engine and transmission rebuild demands precision gaskets and seals that won't fail under race conditions or high-mileage use. The MOOSE RACING Complete Motor Gasket Kit eliminates the...M808582- SKU:
- M808582
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$83.24 -
MOOSE RACING Complete Motor Gasket Kit - RM250 808583
MOOSE RACING
$94.97A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your RM250's integrity under race conditions. The MOOSE RACING Complete Motor Gasket Kit...M808583- SKU:
- M808583
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- TYPE:
- ENGINE
- UNITS:
- KIT
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$94.97Qty in Cart: 0Quantity:Price:$94.97Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - RM250 808587
MOOSE RACING
$92.02A complete engine rebuild demands precision gaskets and seals that won't compromise your RM250's reliability or performance. This Moose Racing kit eliminates the guesswork of sourcing individual...M808587- SKU:
- M808587
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$92.02
