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
-
HELIX Gasket Material - 14.5" x 30" 403-5012
HELIX
$34.95A quality gasket material is foundational to any reliable engine or powersports build—it's the seal between catastrophic leaks and a tight, performing system. The HELIX 403-5012 delivers consistent, durable sealing across oil, fuel, coolant, and exhaust...09344769- SKU:
- 09344769
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- MATERIAL:
- NITRILE RUBBER
- RIDING STYLE:
- ATV
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- THICKNESS:
- 0,81 MM (0,032')
- PRODUCT NAME:
- GASKET MATERIAL
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- TYPE:
- BULK
$34.95 -
On Sale
ATHENA Gasket Kit - RMZ250 P400510160018
ATHENA
MSRP: $67.95Now: $61.00Was: $67.95Suzuki RMZ250 riders pushing hard on the track demand a gasket kit that matches their intensity—one engineered to handle sustained heat and combustion pressures without compromise. The ATHENA Gasket Kit pairs precision-machined components with advanced...09344758- SKU:
- 09344758
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE:
- 88,00 MM
- BORE SIZE METRIC:
- 88.00 MM
- DISPLACEMENT:
- 290 CC
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
MSRP: $67.95Now: $61.00Was: $67.95Qty in Cart: 0Quantity:Price:MSRP: $67.95Now: $61.00Was: $67.95Subtotal: -
COMETIC Stator Gasket - Kawasaki EC904032AFM
COMETIC
$17.95Stator cover gasket failures lead to oil leaks, increased service downtime, and potential engine damage—especially in high-performance applications where sealing surfaces are compromised. The COMETIC Stator Gasket eliminates the frustration of stuck...09344504- SKU:
- 09344504
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- TYPE:
- STATOR COVER
- UNITS:
- EACH
$17.95 -
COMETIC Clutch Gasket - Honda EC901032AFM
COMETIC
$18.95A quality clutch gasket is essential to prevent oil weeping and maintain a reliable seal under the thermal stress of racing and high-performance driving. The COMETIC Clutch Gasket eliminates the need for messy sealants and time-consuming re-torquing,...09344503- SKU:
- 09344503
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- MODEL:
- HI-PERFORMANCE
- THICKNESS IMPERIAL:
- 0,032'
- PRODUCT NAME:
- GASKET
$18.95 -
COMETIC Clutch Gasket - Kawasaki EC847060AFM
COMETIC
$14.95A quality clutch gasket is critical to preventing oil weep and maintaining a reliable seal under high operating temperatures. The COMETIC EC847060AFM uses an AFM composite construction—chemically blown nitrile synthetic rubber bonded to an aluminum...09344500- SKU:
- 09344500
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- MODEL:
- HI-PERFORMANCE
$14.95Qty in Cart: 0Quantity:Price:$14.95Subtotal: -
COMETIC Clutch Gasket - Honda EC619032AFM
COMETIC
$15.95Clutch cover gasket failures lead to oil weeping, loss of torque retention, and costly downtime between rebuilds. The COMETIC EC619032AFM eliminates these headaches with an aluminum-core AFM material engineered to seal reliably under sustained heat and...09344482- SKU:
- 09344482
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- TYPE:
- CLUTCH COVER
$15.95Qty in Cart: 0Quantity:Price:$15.95Subtotal: -
COMETIC Stator Gasket - Honda EC586032AFM
COMETIC
$9.95A quality stator cover gasket is critical to preventing oil seepage and maintaining engine integrity during high-RPM operation. The COMETIC Stator Gasket eliminates the frustration of repetitive gasket failure and time-consuming removal procedures,...09344477- SKU:
- 09344477
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STATOR COVER
- UNITS:
- EACH
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
COMETIC Stator Gasket - Yamaha EC292060AFM
COMETIC
$8.95Stator cover gaskets fail silently, causing oil weeps that damage ignition systems and compromise engine reliability. The Cometic AFM gasket eliminates repeat failures by bonding a rigid aluminum core to premium synthetic rubber, delivering a superior...09344430- SKU:
- 09344430
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STATOR COVER
- MODEL:
- HI-PERFORMANCE
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$8.95 -
COMETIC Crank Seal Kit C7653
COMETIC
$21.95Crank seal failure compromises engine integrity and can lead to costly oil leaks and contamination of your combustion chamber. The COMETIC Crank Seal Kit C7653 provides OE-quality sealing engineered for high-performance applications, delivering the...09344314- SKU:
- 09344314
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- CRANKSHAFT
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- OIL
$21.95 -
COMETIC Top End Gasket Set - Yamaha C7530
COMETIC
$26.95A quality top end gasket set is non-negotiable for any engine rebuild or high-output application—factory gaskets simply can't handle the cylinder pressures of modern performance builds. The Cometic C7530 uses multi-layered steel construction with Viton...09344310- SKU:
- 09344310
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 87.50 MM
$26.95 -
COMETIC Exhaust Gasket - Yamaha C7507EX
COMETIC
$10.95Exhaust gasket failure leads to catastrophic leaks, power loss, and costly engine damage—especially under high heat and boost conditions. The COMETIC C7507EX is engineered for Yamaha 4-stroke applications with dual-layer construction that withstands...09344305- SKU:
- 09344305
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- TYPE:
- EXHAUST
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
COMETIC Top End Gasket Set - Honda C7466
COMETIC
$34.95A failing top end gasket can cost you horsepower, reliability, and race time. The COMETIC C7466 uses multi-layered steel construction with Viton rubber coating to handle extreme cylinder pressures in both naturally aspirated and boosted applications,...09344302- SKU:
- 09344302
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- THICKNESS METRIC:
- 0.31 MM
- THICKNESS IMPERIAL:
- 0,012'
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 57.70 MM
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
$34.95 -
COMETIC Exhaust Gasket C7399EX
COMETIC
$4.95Exhaust gasket failure is one of the most overlooked causes of performance loss and engine damage in high-output applications. The COMETIC C7399EX is engineered to withstand extreme combustion temperatures and over-torque situations that would compromise...09344298- SKU:
- 09344298
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 58.00 MM
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ATV
- ENGINE TYPE:
- 2-STROKE
- TYPE:
- EXHAUST
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
$4.95Qty in Cart: 0Quantity:Price:$4.95Subtotal: -
COMETIC Top End Gasket Set - Yamaha C7252
COMETIC
$36.95A failed head gasket doesn't just sideline your engine—it compromises combustion efficiency, cylinder pressure retention, and ultimately your power output. The COMETIC Top End Gasket Set C7252 delivers the sealing integrity and thermal management your...09344261- SKU:
- 09344261
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 90.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
$36.95Qty in Cart: 0Quantity:Price:$36.95Subtotal: -
COMETIC Exhaust Gasket - KTM C3222EX
COMETIC
$8.95Exhaust gasket failure leads to leaks, power loss, and costly engine damage—especially in high-heat environments. The COMETIC C3222EX delivers reliable, leak-free sealing under extreme temperatures and over-torque conditions, keeping your KTM 4-stroke...09344112- SKU:
- 09344112
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- MODEL:
- HI-PERFORMANCE
- TYPE:
- EXHAUST
- UNITS:
- SET
$8.95Qty in Cart: 0Quantity:Price:$8.95Subtotal: -
HOT RODS Water Pump Repair Kit - Honda WPK0009
HOT RODS
$34.95A leaking water pump compromises engine cooling and can lead to catastrophic overheating on the track or street. The HOT RODS Water Pump Repair Kit (WPK0009) gives you the precision bearings and seals needed to restore your Honda's cooling system to OEM...09342921- SKU:
- 09342921
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$34.95 -
HOT RODS Water Pump Repair Kit - Honda WPK0005
HOT RODS
$34.95A failing water pump doesn't just compromise cooling efficiency—it risks catastrophic engine damage if left unchecked. This HOT RODS repair kit provides OEM-quality replacement seals and bearings to restore your pump's integrity without the cost of a...09342917- SKU:
- 09342917
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
$34.95 -
HOT RODS Water Pump Repair Kit - Honda WPK0004
HOT RODS
$110.95A failing water pump can quickly escalate from a minor leak into catastrophic engine damage. This HOT RODS repair kit gives you everything needed to restore your Honda's cooling system without replacing the entire pump—saving time and money while...09342916- SKU:
- 09342916
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
$110.95 -
On Sale
ATHENA Gasket Kit - YZ250 P400485160183
ATHENA
MSRP: $32.95Now: $30.00Was: $32.95The ATHENA Gasket Kit P400485160183 is engineered for YZ250 owners who demand reliability and sustained performance in high-heat environments. Factory gasket sets deteriorate under repeated thermal cycles, compromising compression and allowing coolant...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
MSRP: $32.95Now: $30.00Was: $32.95 -
On Sale
ATHENA Top End Gasket Kit - Suzuki P400510600045
ATHENA
MSRP: $101.80Now: $87.00Was: $101.80Whether you're prepping for race day or executing a mid-season engine refresh, the ATHENA Top End Gasket Kit delivers the precision sealing your engine demands. This kit empowers you to optimize your setup—run pump gas with stock compression for...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
MSRP: $101.80Now: $87.00Was: $101.80Qty in Cart: 0Quantity:Price:MSRP: $101.80Now: $87.00Was: $101.80Subtotal:
