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 Motor Gasket Kit with Seal - CR250 811254
MOOSE RACING
$81.65Engine and transmission rebuilds demand precision and reliability—a single failed gasket or seal can compromise hours of machine work and thousands in parts investment. The MOOSE RACING Motor Gasket Kit delivers OEM-quality seals at a fraction of...M811254- SKU:
- M811254
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$81.65Qty in Cart: 0Quantity:Price:$81.65Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KX/RM65 811412
MOOSE RACING
$67.72A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't fail under race conditions or heavy use. The MOOSE RACING Motor Gasket Kit eliminates the guesswork and expense of sourcing individual components by delivering...M811412- SKU:
- M811412
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$67.72Qty in Cart: 0Quantity:Price:$67.72Subtotal: -
MOOSE RACING Top End Gasket Kit - CR250R 810257
MOOSE RACING
$33.51When you're rebuilding a CR250R top end, you need gaskets and seals that won't let you down—and OEM replacements can drain your wallet fast. This Moose Racing kit gives you every gasket, O-ring, and seal required for a complete rebuild at a fraction of...M810257- SKU:
- M810257
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$33.51Qty in Cart: 0Quantity:Price:$33.51Subtotal: -
MOOSE RACING Top End Gasket Kit - XL/XR250 810258
MOOSE RACING
$80.32When you're rebuilding a top end, every gasket and seal matters—factory tolerances demand precision, and substandard materials lead to leaks, compression loss, and catastrophic failure. The MOOSE RACING Top End Gasket Kit gives you OEM-quality seals at a...M810258- SKU:
- M810258
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$80.32 -
MOOSE RACING Top End Gasket Kit - CR250R 810259
MOOSE RACING
$41.54When you're rebuilding a CR250R top end, using a complete OEM-quality gasket kit eliminates guesswork and ensures proper sealing from the first fire-up. The MOOSE RACING Top End Gasket Kit gives you every seal and gasket needed for a professional rebuild...M810259- SKU:
- M810259
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$41.54 -
MOOSE RACING Top End Gasket Kit - CR250 810260
MOOSE RACING
$33.51A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or performance. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, allowing you to restore your CR250 with confidence...M810260- SKU:
- M810260
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- THICKNESS METRIC:
- 2.50 MM
- THICKNESS IMPERIAL:
- 0,100'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$33.51Qty in Cart: 0Quantity:Price:$33.51Subtotal: -
Cylinder Works Big Bore Gasket Kit Yamaha YFZ450R 2009-2019 21003-G01
CYLINDER WORKS
$112.95Stock cylinders wear down over time, causing compression loss, increased blow-by, and sluggish throttle response. The Cylinder Works Big Bore Gasket Kit delivers a straightforward path to restore and exceed your YFZ450R's original performance without the...09341699- SKU:
- 09341699
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- STYLE:
- BIG BORE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- OVERSIZED (+3.00 MM)
- MATERIAL:
- NICKEL SILICON CARBIDE
$112.95Qty in Cart: 0Quantity:Price:$112.95Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - CR250 811257
MOOSE RACING
$77.38A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or wallet. The MOOSE RACING Motor Gasket Kit delivers OEM-quality components at a fraction of dealership pricing, giving you the confidence...M811257- SKU:
- M811257
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- TYPE:
- ENGINE
$77.38 -
MOOSE RACING Motor Gasket Kit with Seal - RM250 811580
MOOSE RACING
$88.44A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or wallet. MOOSE Racing delivers OEM-quality components at a fraction of the cost, so you can rebuild with confidence knowing every...M811580- SKU:
- M811580
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$88.44 -
MOOSE RACING Motor Gasket Kit with Seal - RM250 811581
MOOSE RACING
$90.04Engine and transmission rebuilds demand precision-fit gaskets and seals that won't compromise reliability or break your budget. The MOOSE RACING Motor Gasket Kit delivers genuine OEM-quality oil seals and complete gasket coverage at a fraction of OEM...M811581- SKU:
- M811581
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$90.04Qty in Cart: 0Quantity:Price:$90.04Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - RM250 811583
MOOSE RACING
$114.69A complete engine and transmission rebuild demands precision-fit gaskets and seals—any compromise in quality leads to leaks, performance loss, and costly rework. This Moose Racing kit delivers OEM-specification components at a fraction of dealer pricing,...M811583- SKU:
- M811583
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- UNITS:
- KIT
$114.69 -
MOOSE RACING Motor Gasket Kit with Seal - RM250 811587
MOOSE RACING
$112.56A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work or your budget. MOOSE Racing delivers OEM-quality replacement seals at a fraction of dealership pricing, giving you the confidence to rebuild...M811587- SKU:
- M811587
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$112.56 -
MOOSE RACING Motor Gasket Kit with Seal - YZ80 811613
MOOSE RACING
$59.12A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or your budget. MOOSE Racing delivers OEM-equivalent performance at a fraction of dealership pricing, giving you the confidence to rebuild...M811613- SKU:
- M811613
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$59.12Qty in Cart: 0Quantity:Price:$59.12Subtotal: -
MOOSE RACING Inner Clutch Cover Gasket 816319
MOOSE RACING
$42.03A leaking clutch cover gasket compromises engine integrity and invites costly internal damage—this Moose Racing replacement stops seepage at the source. Factory-equivalent sealing performance at a fraction of OEM pricing means you get reliability without...09346153- SKU:
- 09346153
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$42.03 -
MOOSE RACING Ignition Cover Gasket 816510
MOOSE RACING
$7.09A compromised ignition cover gasket means oil seepage, potential engine damage, and unreliable performance when it matters most. The MOOSE RACING Ignition Cover Gasket 816510 delivers a factory-quality seal using premium materials engineered for the...09346154- SKU:
- 09346154
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- IGNITION COVER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$7.09 -
MOOSE RACING Ignition Cover Gasket 816517
MOOSE RACING
$5.29A quality ignition cover gasket is essential for maintaining a proper seal on your engine's ignition system, preventing oil leakage and contamination that can compromise ignition performance and reliability. MOOSE Racing's 816517 gasket is engineered to...09346155- SKU:
- 09346155
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- IGNITION COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$5.29 -
MOOSE RACING Ignition Cover Gasket 816532
MOOSE RACING
$10.02A worn or compromised ignition cover gasket can lead to oil seepage, contamination of ignition components, and potential electrical failures that sideline your engine. The MOOSE RACING Ignition Cover Gasket 816532 delivers a reliable OEM-quality seal...09346156- SKU:
- 09346156
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- IGNITION COVER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$10.02 -
MOOSE RACING Motor Gasket Kit with Seal - Yamaha 811994
MOOSE RACING
$190.30A complete engine and transmission rebuild demands precision-fit gaskets and seals—using substandard components invites oil leaks, compression loss, and premature failure. The MOOSE RACING Motor Gasket Kit eliminates the guesswork and expense of sourcing...09345999- SKU:
- 09345999
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$190.30 -
MOOSE RACING Water Pump Rebuild Kit 821331
MOOSE RACING
$37.02A failing water pump doesn't just compromise cooling efficiency—it puts your entire engine at risk. This MOOSE RACING rebuild kit gives you a complete, factory-spec solution to restore your pump to OEM performance without the cost of replacement. Whether...09346000- SKU:
- 09346000
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
$37.02 -
MOOSE RACING Water Pump Rebuild Kit 821984
MOOSE RACING
$50.26A failing water pump compromises your entire cooling system, risking catastrophic engine damage and race-ending downtime. The MOOSE RACING Water Pump Rebuild Kit 821984 gives you everything needed to restore pump performance to OEM specifications without...09346001- SKU:
- 09346001
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$50.26Qty in Cart: 0Quantity:Price:$50.26Subtotal:
