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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ATHENA Water Pump Gasket Kit - KTM/Husqvarna P400270475020
ATHENA
$61.95Include water pump gasket, clutch cover gasket, water pump shaft oil seals and washers, Kit contents will vary slightly based on application, Kits do not contain replacement bearings09346381- SKU:
- 09346381
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
$61.95 -
ATHENA Top End Gasket Kit - KTM P400270600092
ATHENA
$73.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason. Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression. Kits do not...09346460- SKU:
- 09346460
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
$73.95 -
MOOSE RACING Top End Gasket Kit - KX 500 810470
MOOSE RACING
$43.80Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810470- SKU:
- M810470
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$43.80 -
MOOSE RACING Top End Gasket Kit - KX 500 810474
MOOSE RACING
$40.87Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810474- SKU:
- M810474
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$40.87 -
MOOSE RACING Top End Gasket Kit - RM 125 810544
MOOSE RACING
$24.85Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810544- SKU:
- M810544
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$24.85 -
MOOSE RACING Top End Gasket Kit - RM 125 810545
MOOSE RACING
$24.85Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810545- SKU:
- M810545
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$24.85 -
MOOSE RACING Top End Gasket Kit - RM 125 810546
MOOSE RACING
$27.72Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810546- SKU:
- M810546
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$27.72 -
MOOSE RACING Top End Gasket Kit - TRX 250 810841
MOOSE RACING
$48.17Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810841- SKU:
- M810841
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- ATV
$48.17 -
MOOSE RACING Top End Gasket Kit - KVF 360 810845
MOOSE RACING
$48.17Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810845- SKU:
- M810845
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$48.17 -
MOOSE RACING Top End Gasket Kit - Arctic Cat/Suzuki 810846
MOOSE RACING
$61.69Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810846- SKU:
- M810846
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$61.69 -
MOOSE RACING Top End Gasket Kit - DVX/LTZ/KFX 810847
MOOSE RACING
$60.52Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810847- SKU:
- M810847
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- TOP END
- RIDING STYLE:
- ATV
$60.52 -
MOOSE RACING Ignition Cover Gasket 816658
MOOSE RACING
$6.38Made in the U.S.A.09346158- SKU:
- 09346158
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER
$6.38 -
MOOSE RACING Complete Motor Gasket Kit - YZ450F/WR450F 808994
MOOSE RACING
$150.60Moose can now handle all your gasket and seal needs at a fraction of OEM cost., High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09345997- SKU:
- 09345997
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$150.60 -
MOOSE RACING Top End Gasket Kit Yamaha 810994
MOOSE RACING
$64.58Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...09345998- SKU:
- 09345998
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
$64.58 -
MOOSE RACING Complete Motor Gasket Kit - Arctic Cat/Suzuki 808828
MOOSE RACING
$70.11Moose can now handle all your gasket and seal needs at a fraction of OEM cost., High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M808828- SKU:
- M808828
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- RIDING STYLE:
- ATV
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- UNITS:
- KIT
$70.11 -
K&S TECHNOLOGIES Water Pump Repair Gasket Kit - YZF450 75-4003
K&S TECHNOLOGIES
$37.95Each kit includes all necessary gaskets, washers, seals and O-rings; kit contents vary by model09341923- SKU:
- 09341923
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
$37.95 -
JAMES GASKET Cylinder Head Gasket ST-16500085
JAMES GASKET
$97.95Genuine James kits include matching head and base gaskets and O-rings where applicable, Made in the U.S.A.09346474- SKU:
- 09346474
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- MATERIAL:
- -
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,045'
- BORE SIZE:
- STANDARD
- BORE SIZE IMPERIAL:
- STANDARD
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.14 MM
- UNITS:
- 2 PACK
$97.95 -
JAMES GASKET Cylinder Head Gasket ST-16500123
JAMES GASKET
$97.95Genuine James kits include matching head and base gaskets and O-rings where applicable, Made in the U.S.A.09346476- SKU:
- 09346476
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- -
- THICKNESS IMPERIAL:
- 0,045'
- BORE SIZE:
- STANDARD
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.14 MM
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- STANDARD
- UNITS:
- 2 PACK
$97.95Qty in Cart: 0Quantity:Price:$97.95Subtotal: -
JAMES GASKET Cam Chain Tensioner Gasket ST-25500005
JAMES GASKET
$48.95Foamet feature an aluminum core coated on two sides with expanded nitrile rubber, then coated with a silicone release coating to ensure a positive seal with excellent release characteristic upon disassembly., Made in the U.S.A.09346478- SKU:
- 09346478
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- 2 PACK
- TYPE:
- CAM CHAIN TENSIONER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$48.95 -
JAMES GASKET Complete Motor Gasket Kit ST-25700443
JAMES GASKET
$217.95To-quality gaskets, oil seals, and o-rings necessary to rebuild an engine, Made in the U.S.A.09346483- SKU:
- 09346483
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE SIZE METRIC:
- 69.00 MM
- UNITS:
- KIT
- BORE SIZE:
- 69,00 MM
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.045'
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- ENGINE
$217.95
