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 - CR250R 810250
MOOSE RACING
$23.33A top-end rebuild demands precision—gasket failure compromises compression, causes oil weeping, and tanks performance. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals at a fraction of factory pricing, letting you rebuild your CR250R with...M810250- SKU:
- M810250
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$23.33Qty in Cart: 0Quantity:Price:$23.33Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600213
ATHENA
MSRP: $61.95Now: $56.00Was: $61.95A top-end gasket kit is essential maintenance for any racer looking to maximize engine reliability between rebuilds. The ATHENA P400485600213 gives you the flexibility to run either pump gas with stock compression or switch to race fuel with elevated...09346470- SKU:
- 09346470
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
MSRP: $61.95Now: $56.00Was: $61.95Qty in Cart: 0Quantity:Price:MSRP: $61.95Now: $56.00Was: $61.95Subtotal: -
On Sale
ATHENA Water Pump Gasket Kit - Honda P400210475008
ATHENA
MSRP: $27.95Now: $25.00Was: $27.95Proper coolant sealing is non-negotiable in high-performance applications—a failed water pump gasket can lead to catastrophic overheating and engine damage. The ATHENA Water Pump Gasket Kit delivers OEM-equivalent sealing integrity with...09346044- SKU:
- 09346044
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $27.95Now: $25.00Was: $27.95 -
On Sale
ATHENA Water Pump Gasket Kit - Suzuki P400510475001
ATHENA
MSRP: $34.95Now: $31.00Was: $34.95Include 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 bearings09346080- SKU:
- 09346080
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
MSRP: $34.95Now: $31.00Was: $34.95Qty in Cart: 0Quantity:Price:MSRP: $34.95Now: $31.00Was: $34.95Subtotal: -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475007
ATHENA
MSRP: $37.95Now: $34.00Was: $37.95Include 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 bearings09346089- SKU:
- 09346089
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
MSRP: $37.95Now: $34.00Was: $37.95 -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475009
ATHENA
MSRP: $39.95Now: $36.00Was: $39.95Include 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 bearings09346091- SKU:
- 09346091
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- WATER PUMP
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $39.95Now: $36.00Was: $39.95 -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475010
ATHENA
MSRP: $39.95Now: $36.00Was: $39.95Include 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 bearings09346092- SKU:
- 09346092
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $39.95Now: $36.00Was: $39.95Qty in Cart: 0Quantity:Price:MSRP: $39.95Now: $36.00Was: $39.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Kawasaki/Suzuki P400250850016
ATHENA
MSRP: $132.95Now: $120.00Was: $132.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09340352- SKU:
- 09340352
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- ENGINE TYPE:
- -
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $132.95Now: $120.00Was: $132.95Qty in Cart: 0Quantity:Price:MSRP: $132.95Now: $120.00Was: $132.95Subtotal: -
On Sale
ATHENA Gasket Kit - KX250F/RMZ250 P400510160004
ATHENA
MSRP: $104.95Now: $94.00Was: $104.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09340359- SKU:
- 09340359
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- BORE SIZE:
- 83,00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE METRIC:
- 83.00 MM
- TYPE:
- TOP END
MSRP: $104.95Now: $94.00Was: $104.95Qty in Cart: 0Quantity:Price:MSRP: $104.95Now: $94.00Was: $104.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - KTM P400270850220/1
ATHENA
MSRP: $91.95Now: $83.00Was: $91.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09340221- SKU:
- 09340221
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
MSRP: $91.95Now: $83.00Was: $91.95Qty in Cart: 0Quantity:Price:MSRP: $91.95Now: $83.00Was: $91.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Husqvarna P400220600252
ATHENA
MSRP: $63.95Now: $58.00Was: $63.95Specifically 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...09341789- SKU:
- 09341789
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
MSRP: $63.95Now: $58.00Was: $63.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600207
ATHENA
MSRP: $67.95Now: $61.00Was: $67.95Specifically 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...09341969- SKU:
- 09341969
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $67.95Now: $61.00Was: $67.95Qty in Cart: 0Quantity:Price:MSRP: $67.95Now: $61.00Was: $67.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600192
ATHENA
MSRP: $54.95Now: $49.00Was: $54.95Specifically 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...09341972- SKU:
- 09341972
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- TYPE:
- TOP END
- UNITS:
- KIT
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
MSRP: $54.95Now: $49.00Was: $54.95Qty in Cart: 0Quantity:Price:MSRP: $54.95Now: $49.00Was: $54.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850047
ATHENA
MSRP: $204.95Now: $184.00Was: $204.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09341997- SKU:
- 09341997
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- ENGINE TYPE:
- -
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET KIT
MSRP: $204.95Now: $184.00Was: $204.95Qty in Cart: 0Quantity:Price:MSRP: $204.95Now: $184.00Was: $204.95Subtotal: -
On Sale
ATHENA Race Gasket Kit - YZ 125 R4856-118
ATHENA
MSRP: $18.95Now: $17.00Was: $18.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during mid-season, Kits include a top-of-the line MLSS head gasket and two or more premium-quality base gaskets of different thicknesses to...09342840- SKU:
- 09342840
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- STYLE:
- RACE
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $18.95Now: $17.00Was: $18.95 -
On Sale
ATHENA Race Gasket Kit - YZ80/85 R4856-089
ATHENA
MSRP: $18.95Now: $17.00Was: $18.95Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during mid-season, Kits include a top-of-the line MLSS head gasket and two or more premium-quality base gaskets of different thicknesses to...09342843- SKU:
- 09342843
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- RACE
- UNITS:
- KIT
- TYPE:
- TOP END
MSRP: $18.95Now: $17.00Was: $18.95Qty in Cart: 0Quantity:Price:MSRP: $18.95Now: $17.00Was: $18.95Subtotal: -
On Sale
ATHENA Gasket Kit P400270160059
ATHENA
MSRP: $68.95Now: $62.00Was: $68.95Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets, Forged piston with molybdenum coating, Special gasket kit, Easy-to-follow step-by-step installation instructions, All are bolt-on; no machining required09342898- SKU:
- 09342898
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- DISPLACEMENT:
- 277 CC
- BORE SIZE:
- 80,00 MM
- BORE SIZE METRIC:
- 80.00 MM
- PRODUCT NAME:
- GASKET KIT
MSRP: $68.95Now: $62.00Was: $68.95Qty in Cart: 0Quantity:Price:MSRP: $68.95Now: $62.00Was: $68.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250900065
ATHENA
MSRP: $131.95Now: $119.00Was: $131.95Superior-quality gasket sets from Athena, Head gaskets feature rubber-coated spring steel construction, Soft steel base gaskets are rubber coated, Steel core materials feature high springback and superior tensile strength, Revolutionary transparent...09343165- SKU:
- 09343165
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
MSRP: $131.95Now: $119.00Was: $131.95Qty in Cart: 0Quantity:Price:MSRP: $131.95Now: $119.00Was: $131.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600188
ATHENA
MSRP: $71.95Now: $65.00Was: $71.95Specifically 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...09343173- SKU:
- 09343173
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $71.95Now: $65.00Was: $71.95Qty in Cart: 0Quantity:Price:MSRP: $71.95Now: $65.00Was: $71.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit P400250600015
ATHENA
MSRP: $34.95Now: $31.00Was: $34.95Specifically 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...09340205- SKU:
- 09340205
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- TYPE:
- TOP END
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $34.95Now: $31.00Was: $34.95
