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
-
ATHENA Gasket Kit - YZ250 P400485160183
ATHENA
$32.95ATHENA Gasket Kit YZ250 P400485160183Kits 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...09342584- SKU:
- 09342584
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- BORE SIZE:
- 72,00 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- DISPLACEMENT:
- 293 CC
- BORE SIZE METRIC:
- 72.00 MM
- PRODUCT NAME:
- GASKET KIT
$32.95Qty in Cart: 0Quantity:Price:$32.95Subtotal: -
ATHENA Top End Gasket Kit - Suzuki P400510600045
ATHENA
$96.95ATHENA Top End Gasket Kit Suzuki P400510600045Specifically 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...09342582- SKU:
- 09342582
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
$96.95Qty in Cart: 0Quantity:Price:$96.95Subtotal: -
ATHENA Top End Gasket Kit - Yamaha P400485600069
ATHENA
$96.95ATHENA Top End Gasket Kit Yamaha P400485600069Specifically 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...09342581- SKU:
- 09342581
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
$96.95Qty in Cart: 0Quantity:Price:$96.95Subtotal: -
ATHENA Top End Gasket Kit - Yamaha P400485600053
ATHENA
$96.95ATHENA Top End Gasket Kit Yamaha P400485600053Specifically 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...09342580- SKU:
- 09342580
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- UNITS:
- KIT
- TYPE:
- TOP END
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
$96.95 -
ATHENA Top End Gasket Kit - Kawasaki P400250600047
ATHENA
$86.95ATHENA Top End Gasket Kit Kawasaki P400250600047Specifically 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...09342577- SKU:
- 09342577
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$86.95 -
ATHENA Top End Gasket Kit - Honda P400210600064
ATHENA
$86.95ATHENA Top End Gasket Kit Honda P400210600064Specifically 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...09342574- SKU:
- 09342574
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$86.95 -
ATHENA Top End Gasket Kit - Honda P400210600239
ATHENA
$102.95ATHENA Top End Gasket Kit Honda P400210600239Specifically 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...09342573- SKU:
- 09342573
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$102.95 -
ATHENA Gasket Kit - YZ450F P400485160025
ATHENA
$98.95ATHENA Gasket Kit YZ450F P400485160025Kits 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...09342555- SKU:
- 09342555
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE:
- 102,00 MM
- BORE SIZE METRIC:
- 102.00 MM
$98.95 -
ATHENA Complete Gasket Kit - Honda P400210850187
ATHENA
$98.95ATHENA Complete Gasket Kit Honda P400210850187Superior-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...09342542- SKU:
- 09342542
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- ENGINE TYPE:
- -
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$98.95 -
ATHENA Complete Gasket Kit - Honda P400210850202
ATHENA
$164.95ATHENA Complete Gasket Kit Honda P400210850202Superior-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...09342541- SKU:
- 09342541
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- -
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$164.95 -
ATHENA Top End Gasket Kit - Honda P400210600187
ATHENA
$84.95ATHENA Top End Gasket Kit Honda P400210600187Specifically 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...09342540- SKU:
- 09342540
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$84.95Qty in Cart: 0Quantity:Price:$84.95Subtotal: -
ATHENA Top End Gasket Kit - KTM P400270600056
ATHENA
$96.95ATHENA Top End Gasket Kit KTM P400270600056Specifically 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...09342539- SKU:
- 09342539
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$96.95Qty in Cart: 0Quantity:Price:$96.95Subtotal: -
ATHENA Top End Gasket Kit - Honda P400210600202
ATHENA
$58.95ATHENA Top End Gasket Kit Honda P400210600202Specifically 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...09342538- SKU:
- 09342538
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$58.95Qty in Cart: 0Quantity:Price:$58.95Subtotal: -
ATHENA Top End Gasket Kit - Honda P400210600245
ATHENA
$69.95ATHENA Top End Gasket Kit Honda P400210600245Specifically 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...09342537- SKU:
- 09342537
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
$69.95 -
ATHENA Top End Gasket Kit - Suzuki P400510600098
ATHENA
$73.95ATHENA Top End Gasket Kit Suzuki P400510600098Specifically 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...09342536- SKU:
- 09342536
- Availability:
- Ships Same Business Day
- Weight:
- 0.27 LBS
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$73.95 -
ATHENA Top End Gasket Kit - Yamaha P400485600039
ATHENA
$79.95ATHENA Top End Gasket Kit Yamaha P400485600039Specifically 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...09342534- SKU:
- 09342534
- Availability:
- Ships Same Business Day
- Weight:
- 0.29 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$79.95Qty in Cart: 0Quantity:Price:$79.95Subtotal: -
ATHENA Top End Gasket Kit - Kawasaki P400250600024
ATHENA
$86.95ATHENA Top End Gasket Kit Kawasaki P400250600024Specifically 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...09342533- SKU:
- 09342533
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- TOP END
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$86.95 -
K&S TECHNOLOGIES Water Pump Repair Kit 75-6001
K&S TECHNOLOGIES
$21.95K&S TECHNOLOGIES Water Pump Repair Kit 75-6001Each kit includes all necessary gaskets, washers, seals and O-rings; kit contents vary by model09342527- SKU:
- 09342527
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
$21.95 -
COMETIC Bottom End Gasket Set C3299
COMETIC
$15.95COMETIC Bottom End Gasket Set C3299Bottom end gasket kits include correct oil seals, O-rings, drain plug washers and water pump cover gaskets as needed, Materials will vary depending on what is correct and engineered for specified application, Purchase a...09342514- SKU:
- 09342514
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- MODEL:
- HI-PERFORMANCE
- TYPE:
- BOTTOM END
- BORE SIZE METRIC:
- 55.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
COMETIC Top End Gasket Set C3395-EST
COMETIC
$68.95COMETIC Top End Gasket Set C3395-ESTTop end gasket kits include correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the gasket...09342451- SKU:
- 09342451
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE IMPERIAL:
- 3.819'
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$68.95Qty in Cart: 0Quantity:Price:$68.95Subtotal:
