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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Cylinder Works Big Bore Gasket Kit Kawasaki KX250F 2004-2008 31001-G01
CYLINDER WORKS
$102.95The Cylinder Works Big Bore Gasket Kit delivers measurable performance gains by increasing displacement and compression without requiring machine work or extensive modifications. If you're looking to extract more power from your KX250F while maintaining...09341525- SKU:
- 09341525
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- NICKEL SILICON CARBIDE
- STYLE:
- BIG BORE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- BORE SIZE METRIC:
- OVERSIZED (+3.00 MM)
- TYPE:
- TOP END
$102.95 -
On Sale
ATHENA Water Pump Gasket Kit - Suzuki P400510475004
ATHENA
MSRP: $39.95Now: $36.00Was: $39.95Cooling system leaks compromise engine reliability and performance—they demand immediate attention with OEM-quality replacement gaskets. The ATHENA Water Pump Gasket Kit delivers factory-spec sealing surfaces without the dealer markup, ensuring your...09346083- SKU:
- 09346083
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $39.95Now: $36.00Was: $39.95Qty in Cart: 0Quantity:Price:MSRP: $39.95Now: $36.00Was: $39.95Subtotal: -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475002
ATHENA
MSRP: $37.95Now: $34.00Was: $37.95Seal leaks before they compromise your engine's cooling system and cost you race time. The ATHENA Water Pump Gasket Kit delivers OEM-grade sealing components in a single package, eliminating the frustration of sourcing gaskets and seals individually...09346084- SKU:
- 09346084
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
MSRP: $37.95Now: $34.00Was: $37.95 -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475003
ATHENA
MSRP: $38.95Now: $35.00Was: $38.95Water pump gasket failure is a common culprit behind coolant leaks and engine overheating—issues that can sideline your bike or damage your engine if left unchecked. The ATHENA Water Pump Gasket Kit provides all the OEM-specification seals and gaskets...09346085- SKU:
- 09346085
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $38.95Now: $35.00Was: $38.95 -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475004
ATHENA
MSRP: $34.95Now: $31.00Was: $34.95A leaking water pump doesn't just waste coolant—it compromises engine temperature control and can lead to catastrophic overheating. The ATHENA Water Pump Gasket Kit delivers OEM-quality sealing surfaces to restore your cooling system's integrity without...09346086- SKU:
- 09346086
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
MSRP: $34.95Now: $31.00Was: $34.95 -
On Sale
ATHENA Water Pump Gasket Kit - Yamaha P400485475006
ATHENA
MSRP: $37.95Now: $34.00Was: $37.95Coolant leaks and seal failures compromise engine reliability and performance—two things you can't afford on the track or in your build. The ATHENA Water Pump Gasket Kit provides OEM-quality sealing surfaces and precision-fit components to restore your...09346088- SKU:
- 09346088
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
MSRP: $37.95Now: $34.00Was: $37.95 -
On Sale
ATHENA Gasket Kit - CRF230F P400210160316
ATHENA
MSRP: $37.95Now: $34.00Was: $37.95The ATHENA Gasket Kit is engineered for CRF230F owners looking to rebuild their engine with OEM-quality components that deliver reliable performance and longevity. This complete kit eliminates the guesswork of sourcing individual gaskets and seals,...09344814- SKU:
- 09344814
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE METRIC:
- 67.00 MM
- DISPLACEMENT:
- 233 CC
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE:
- 67,00 MM
- PRODUCT NAME:
- GASKET KIT
MSRP: $37.95Now: $34.00Was: $37.95Qty in Cart: 0Quantity:Price:MSRP: $37.95Now: $34.00Was: $37.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600304
ATHENA
MSRP: $38.95Now: $35.00Was: $38.95Engine reliability is everything when you're on the line, and a fresh top end gasket kit is your insurance policy before race day. The ATHENA P400210600304 gives you the flexibility to optimize your power delivery—run premium race fuel with elevated...09344815- SKU:
- 09344815
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $38.95Now: $35.00Was: $38.95 -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600004
ATHENA
MSRP: $12.95Now: $12.00Was: $12.95Whether you're prepping for race day or executing a midseason refresh, a quality top-end gasket kit is essential to maintaining cylinder head integrity and preventing catastrophic leaks. The ATHENA Top End Gasket Kit gives you the flexibility to tune...09344818- SKU:
- 09344818
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $12.95Now: $12.00Was: $12.95 -
On Sale
ATHENA Top End Gasket Kit P400210600065
ATHENA
MSRP: $45.10Now: $39.00Was: $45.10Whether you're prepping for race day or conducting a midseason engine refresh, the ATHENA Top End Gasket Kit P400210600065 delivers the reliability pro and amateur riders depend on. This kit lets you optimize your engine's compression strategy—run stock...09340200- SKU:
- 09340200
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
MSRP: $45.10Now: $39.00Was: $45.10Qty in Cart: 0Quantity:Price:MSRP: $45.10Now: $39.00Was: $45.10Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850015
ATHENA
MSRP: $108.10Now: $93.00Was: $108.10When rebuilding a top-end or complete engine, gasket failure is the difference between a reliable rebuild and catastrophic coolant loss. The ATHENA Complete Gasket Kit delivers the precision sealing required for high-temperature racing environments, with...09340203- SKU:
- 09340203
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $108.10Now: $93.00Was: $108.10Qty in Cart: 0Quantity:Price:MSRP: $108.10Now: $93.00Was: $108.10Subtotal: -
On Sale
ATHENA Top End Gasket Kit - KTM/Husqvarna P400270600090
ATHENA
MSRP: $72.95Now: $66.00Was: $72.95Whether you're prepping for race day or executing a midseason engine refresh, the ATHENA Top End Gasket Kit delivers the reliability pro and amateur riders demand when freshening their two-stroke. This kit gives you the flexibility to run your engine on...09346351- SKU:
- 09346351
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
MSRP: $72.95Now: $66.00Was: $72.95 -
On Sale
ATHENA Top End Gasket Kit - Kawasaki P400250600068
ATHENA
MSRP: $82.95Now: $75.00Was: $82.95A fresh top-end gasket set is essential maintenance before race season or mid-season rebuilds, ensuring proper compression sealing and preventing costly leaks under high-load conditions. The ATHENA P400250600068 kit gives you the flexibility to run...09346354- SKU:
- 09346354
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
MSRP: $82.95Now: $75.00Was: $82.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250900068
ATHENA
MSRP: $224.95Now: $202.00Was: $224.95A complete gasket failure can leave you stranded or cost thousands in engine damage. The ATHENA Complete Gasket Kit delivers OEM-equivalent sealing integrity across all critical surfaces, ensuring your Kawasaki P400 engine maintains compression and...09346355- SKU:
- 09346355
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $224.95Now: $202.00Was: $224.95 -
On Sale
ATHENA Complete Gasket Kit - KTM P400270900088
ATHENA
MSRP: $205.95Now: $185.00Was: $205.95A complete gasket kit is essential for engine longevity and reliability—whether you're rebuilding after a major service or protecting against future failures. The ATHENA Complete Gasket Kit delivers OEM-quality sealing across all critical engine...09346356- SKU:
- 09346356
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
MSRP: $205.95Now: $185.00Was: $205.95 -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600198
ATHENA
MSRP: $31.95Now: $29.00Was: $31.95Whether you're prepping for race day or executing a midseason engine refresh, the ATHENA Top End Gasket Kit gives you the flexibility to optimize your engine's performance without a complete rebuild. This kit lets you choose between standard fuel with...09346357- SKU:
- 09346357
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $31.95Now: $29.00Was: $31.95Qty in Cart: 0Quantity:Price:MSRP: $31.95Now: $29.00Was: $31.95Subtotal: -
HOT RODS Water Pump Repair Kit - Kawasaki WPK0030
HOT RODS
$39.95A leaking water pump doesn't just waste coolant—it puts your engine at risk of overheating and catastrophic failure. The HOT RODS Water Pump Repair Kit gives you OEM-quality replacement internals to restore pump integrity without the cost of a full...09345375- SKU:
- 09345375
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
$39.95 -
HOT RODS Water Pump Repair Kit - KTM WPK0068
HOT RODS
$70.95A leaking water pump compromises engine cooling efficiency and can lead to catastrophic overheating—especially under racing conditions or extended high-load operation. The HOT RODS Water Pump Repair Kit (WPK0068) gives you OEM-equivalent precision...09345377- SKU:
- 09345377
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$70.95 -
HOT RODS Water Pump Repair Kit - Yamaha WPK0059
HOT RODS
$34.95A failing water pump doesn't just waste your time—it puts your engine at risk. This HOT RODS repair kit gives you OEM-quality bearings and seals to restore proper cooling circulation and eliminate leaks without replacing the entire pump. Whether you're...09344044- SKU:
- 09344044
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
$34.95 -
HOT RODS Water Pump Repair Kit - KTM WPK0051
HOT RODS
$110.95Water pump failures can sideline your bike at the worst possible moment—whether you're on the track or miles from the nearest shop. This repair kit addresses the root causes of pump degradation by replacing critical internal components that wear under...09343048- SKU:
- 09343048
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
$110.95
