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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On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600115/1
ATHENA
MSRP: $30.95Now: $26.00Was: $30.95Whether you're prepping for race day or mid-season maintenance, the ATHENA Top End Gasket Kit delivers the reliability needed to keep your engine sealed tight under competition conditions. This kit...400485600115- SKU:
- 400485600115
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $30.95Now: $26.00Was: $30.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850136
ATHENA
MSRP: $53.95Now: $46.00Was: $53.95A complete top-end rebuild demands gaskets engineered to withstand sustained combustion pressures and thermal cycling without failure. Athena's complete gasket kit eliminates the guesswork of...400250850136- SKU:
- 400250850136
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $53.95Now: $46.00Was: $53.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850501
ATHENA
MSRP: $35.95Now: $31.00Was: $35.95A complete engine rebuild demands gasket materials that withstand extreme combustion pressures and temperature swings without compromising seal integrity. The ATHENA Complete Gasket Kit delivers...400210850501- SKU:
- 400210850501
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
MSRP: $35.95Now: $31.00Was: $35.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850200
ATHENA
MSRP: $47.95Now: $40.00Was: $47.95A complete gasket kit is essential for any top-end rebuild or full engine overhaul—using OEM-quality gaskets ensures reliable sealing across all critical surfaces and eliminates the risk of leaks...400210850200- SKU:
- 400210850200
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
MSRP: $47.95Now: $40.00Was: $47.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850085
ATHENA
MSRP: $55.95Now: $48.00Was: $55.95A complete gasket kit is essential for any top-end or full engine rebuild—it ensures critical seals that prevent oil leakage, coolant loss, and combustion blow-by that compromise performance and...400210850085- SKU:
- 400210850085
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $55.95Now: $48.00Was: $55.95Qty in Cart: 0Quantity:Price:MSRP: $55.95Now: $48.00Was: $55.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600252
ATHENA
MSRP: $37.95Now: $34.00Was: $37.95Whether you're prepping for race day or executing a midseason engine refresh, the ATHENA Top End Gasket Kit gives you the flexibility to dial in your compression ratio to match your fuel choice and...400210600252- SKU:
- 400210600252
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
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 P400210600250
ATHENA
MSRP: $34.95Now: $30.00Was: $34.95Whether you're prepping for race day or executing a midseason engine refresh, the ATHENA Top End Gasket Kit ensures a reliable seal that lets you choose your fuel strategy—run stock compression with...400210600250- SKU:
- 400210600250
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $34.95Now: $30.00Was: $34.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600125
ATHENA
MSRP: $45.95Now: $41.00Was: $45.95When you're prepping your Honda for race day, a fresh top end gasket kit is non-negotiable—it seals combustion properly and ensures your engine performs consistently whether you're running pump gas...400210600125- SKU:
- 400210600125
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
MSRP: $45.95Now: $41.00Was: $45.95Qty in Cart: 0Quantity:Price:MSRP: $45.95Now: $41.00Was: $45.95Subtotal: -
On Sale
ATHENA Water Pump Gasket Kit - KTM P400270475001
ATHENA
MSRP: $39.95Now: $34.00Was: $39.95Coolant leaks and seal failures can sideline your KTM mid-season, compromising engine reliability when you need it most. The ATHENA Water Pump Gasket Kit provides OEM-spec replacement seals and...09346063- SKU:
- 09346063
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
MSRP: $39.95Now: $34.00Was: $39.95 -
On Sale
ATHENA Water Pump Gasket Kit - Kawasaki P400250475012
ATHENA
MSRP: $68.95Now: $62.00Was: $68.95Gasket and seal failures are among the most common causes of coolant leaks and oil seepage in high-performance engines. The ATHENA Water Pump Gasket Kit provides OEM-quality replacement gaskets and...09346060- SKU:
- 09346060
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- WATER PUMP
MSRP: $68.95Now: $62.00Was: $68.95Qty in Cart: 0Quantity:Price:MSRP: $68.95Now: $62.00Was: $68.95Subtotal: -
On Sale
ATHENA Water Pump Gasket Kit - Kawasaki P400250475009
ATHENA
MSRP: $53.95Now: $46.00Was: $53.95Coolant leaks and seal failures can compromise engine temperature control and lead to costly damage. The ATHENA Water Pump Gasket Kit provides OEM-equivalent sealing components engineered to...09346057- SKU:
- 09346057
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $53.95Now: $46.00Was: $53.95Qty in Cart: 0Quantity:Price:MSRP: $53.95Now: $46.00Was: $53.95Subtotal: -
On Sale
ATHENA Water Pump Gasket Kit - Honda P400210475012
ATHENA
MSRP: $35.95Now: $31.00Was: $35.95A failing water pump gasket kit leads to coolant leaks, overheating, and potential engine damage—issues that sideline your vehicle and compromise reliability. The ATHENA P400210475012 kit eliminates...09346048- SKU:
- 09346048
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $35.95Now: $31.00Was: $35.95 -
Cylinder Works Big Bore Gasket Kit for Yamaha YZ250 1999-2020 21009-G01
CYLINDER WORKS
$113.95When your YZ250's stock cylinder reaches its limits, a big bore kit is the direct path to increased displacement, improved throttle response, and measurable power gains. The Cylinder Works 21009-G01...09344757- SKU:
- 09344757
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- STYLE:
- BIG BORE
- PRODUCT NAME:
- GASKET KIT
$113.95Qty in Cart: 0Quantity:Price:$113.95Subtotal: -
On Sale
COMETIC Bottom End Gasket Set - Yamaha C7507BE
COMETIC
MSRP: $90.95Now: $81.86Was: $90.95A complete bottom end gasket set is essential for any serious engine rebuild—it ensures proper sealing across all critical oil passages, drain points, and water circulation routes. Using...09344304- SKU:
- 09344304
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- BOTTOM END
- MODEL:
- HI-PERFORMANCE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $90.95Now: $81.86Was: $90.95 -
On Sale
COMETIC Top End Gasket Set - Honda C7278
COMETIC
MSRP: $42.95Now: $38.66Was: $42.95A quality gasket set is non-negotiable for reliable top-end performance, especially when running high-horsepower builds or forced induction. The COMETIC C7278 uses multi-layered steel construction...09344269- SKU:
- 09344269
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE SIZE METRIC:
- 71.00 MM
- THICKNESS IMPERIAL:
- 0,012'
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- THICKNESS METRIC:
- 0.31 MM
MSRP: $42.95Now: $38.66Was: $42.95Qty in Cart: 0Quantity:Price:MSRP: $42.95Now: $38.66Was: $42.95Subtotal: -
HOT RODS Water Pump Repair Kit - Honda WPK0003
HOT RODS
$63.95A failing water pump doesn't just compromise cooling efficiency—it risks catastrophic engine damage if ignored. This repair kit addresses the root causes of pump failure by replacing worn bearings...09342915- SKU:
- 09342915
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
$63.95 -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600069
ATHENA
MSRP: $101.95Now: $87.00Was: $101.95When you're prepping your engine for race day, a quality gasket kit is non-negotiable—it's your seal against compression loss and mid-race failures. The ATHENA Top End Gasket Kit gives you the...09342581- SKU:
- 09342581
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
MSRP: $101.95Now: $87.00Was: $101.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850202
ATHENA
MSRP: $164.95Now: $148.00Was: $164.95A complete engine rebuild demands gasket integrity that won't compromise under sustained load and heat—this Athena kit delivers the precision sealing your top-end rebuild requires. Whether you're...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
MSRP: $164.95Now: $148.00Was: $164.95Qty in Cart: 0Quantity:Price:MSRP: $164.95Now: $148.00Was: $164.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600187
ATHENA
MSRP: $84.95Now: $76.00Was: $84.95Whether you're prepping for race day or executing a midseason engine refresh, the ATHENA Top End Gasket Kit delivers the precision sealing your engine demands. This kit is engineered for riders who...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
MSRP: $84.95Now: $76.00Was: $84.95Qty in Cart: 0Quantity:Price:MSRP: $84.95Now: $76.00Was: $84.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - KTM P400270600056
ATHENA
MSRP: $96.95Now: $87.00Was: $96.95When you're prepping for race day—whether it's your first season or your hundredth—a fresh top end gasket kit is non-negotiable. The ATHENA P400270600056 gives you the flexibility to run either pump...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
MSRP: $96.95Now: $87.00Was: $96.95Qty in Cart: 0Quantity:Price:MSRP: $96.95Now: $87.00Was: $96.95Subtotal:
