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...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...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...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...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...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...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...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...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,...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...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
$90.04 -
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...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...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...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
$59.12 -
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...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...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...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...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...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...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...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:
