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 pricing, so you can confidently refresh your KX 100's...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 OEM-equivalent reliability at a fraction of the price,...M810410- SKU:
- M810410
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$24.85Qty in Cart: 0Quantity:Price:$24.85Subtotal: -
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 OEM-quality seals at a fraction of the cost, with U.S.A.-made...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 fraction of OEM pricing, using high-tech materials...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 component—Moose Racing delivers genuine-quality...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 fraction of the cost, allowing you to rebuild with confidence...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 components engineered specifically for the KX80,...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 the cost, letting you rebuild with confidence and recoup...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 a fraction of OEM pricing, giving you the confidence to...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 OEM-quality replacement seals at a fraction of dealership...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 fraction of OEM pricing, giving you the confidence to...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
$80.18Qty in Cart: 0Quantity:Price:$80.18Subtotal: -
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.-made components that handle high-compression...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, US-manufactured set engineered to OEM specifications—giving you the...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 of the cost, letting you execute a complete piston...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 fraction of the price, giving you the confidence to...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 includes every gasket, O-ring, and seal needed for a...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 the reliability to focus on performance rather than...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 guesswork of sourcing individual components, delivering...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 eliminates the headache of sourcing individual components...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 components, giving you every gasket, o-ring, and seal...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
