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: $28.95Now: $26.00Was: $28.95Whether 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 gives you the flexibility to run either standard...400485600115- SKU:
- 400485600115
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $28.95Now: $26.00Was: $28.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850136
ATHENA
MSRP: $50.95Now: $46.00Was: $50.95A 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 sourcing individual components, delivering a factory-fresh...400250850136- SKU:
- 400250850136
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $50.95Now: $46.00Was: $50.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850501
ATHENA
MSRP: $33.95Now: $31.00Was: $33.95A complete engine rebuild demands gasket materials that withstand extreme combustion pressures and temperature swings without compromising seal integrity. The ATHENA Complete Gasket Kit delivers factory-quality components engineered to handle both stock...400210850501- SKU:
- 400210850501
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
MSRP: $33.95Now: $31.00Was: $33.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850200
ATHENA
MSRP: $44.95Now: $40.00Was: $44.95A 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 that compromise performance. The Athena P400210850200...400210850200- SKU:
- 400210850200
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
MSRP: $44.95Now: $40.00Was: $44.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850085
ATHENA
MSRP: $52.95Now: $48.00Was: $52.95A 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 reliability. The Athena P400210850085 combines proven...400210850085- SKU:
- 400210850085
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $52.95Now: $48.00Was: $52.95 -
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 performance goals. Pro, semi-pro, and amateur riders...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: $32.95Now: $30.00Was: $32.95Whether 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 pump gas or step up to race gas with elevated...400210600250- SKU:
- 400210600250
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $32.95Now: $30.00Was: $32.95 -
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 or race fuel. The ATHENA P400210600125 gives you the...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: $37.95Now: $34.00Was: $37.95Coolant 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 gaskets to restore proper coolant circulation and prevent...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: $37.95Now: $34.00Was: $37.95 -
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 seals engineered to maintain proper compression 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: $50.95Now: $46.00Was: $50.95Coolant 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 eliminate weeping and maintain system integrity across thermal...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: $50.95Now: $46.00Was: $50.95 -
On Sale
ATHENA Water Pump Gasket Kit - Honda P400210475012
ATHENA
MSRP: $33.95Now: $31.00Was: $33.95A 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 guesswork by providing all necessary gaskets and seals...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: $33.95Now: $31.00Was: $33.95 -
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 delivers a complete, ready-to-install solution that...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: -
COMETIC Bottom End Gasket Set - Yamaha C7507BE
COMETIC
$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 OEM-engineered gaskets matched to your specific application...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
$90.95 -
COMETIC Top End Gasket Set - Honda C7278
COMETIC
$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 with Viton rubber coating to handle extreme cylinder...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
$42.95Qty in Cart: 0Quantity:Price:$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 and compromised seals with OEM-quality components,...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: $96.95Now: $87.00Was: $96.95When 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 flexibility to run either pump gas with stock compression or...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: $96.95Now: $87.00Was: $96.95Qty in Cart: 0Quantity:Price:MSRP: $96.95Now: $87.00Was: $96.95Subtotal: -
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 freshening a stock engine or supporting forced induction,...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 refuse compromise—giving you the flexibility to run...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 gas with stock compression or step up to race fuel with...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:
