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!
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On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850270
ATHENA
MSRP: $42.95Now: $39.00Was: $42.95Whether you're rebuilding a high-mileage engine or preparing for race-season duty, a complete gasket kit is non-negotiable for ensuring cylinder head integrity and preventing coolant or oil seepage under load. The ATHENA Complete Gasket Kit delivers...400485850270- SKU:
- 400485850270
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $42.95Now: $39.00Was: $42.95Qty in Cart: 0Quantity:Price:MSRP: $42.95Now: $39.00Was: $42.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850267
ATHENA
MSRP: $53.95Now: $49.00Was: $53.95Engine gasket failure leads to compression loss, coolant leaks, and catastrophic damage—but a quality gasket set prevents these costly problems before they start. The ATHENA Complete Gasket Kit delivers OEM-equivalent sealing performance across all...400485850267- SKU:
- 400485850267
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $53.95Now: $49.00Was: $53.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850253/1
ATHENA
MSRP: $38.95Now: $35.00Was: $38.95A complete gasket kit is essential for any top-end or full engine rebuild, and using OEM-quality components ensures you won't compromise durability or sealing integrity. Athena's gasket sets are engineered with high-temperature materials and precision...400485850253- SKU:
- 400485850253
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $38.95Now: $35.00Was: $38.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850251
ATHENA
MSRP: $38.95Now: $35.00Was: $38.95A complete gasket kit is essential for any top-end rebuild or full engine overhaul—it ensures reliable sealing across all critical interfaces and prevents costly leaks that compromise performance and longevity. The ATHENA P400485850251 delivers...400485850251- SKU:
- 400485850251
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $38.95Now: $35.00Was: $38.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850125
ATHENA
MSRP: $47.95Now: $43.00Was: $47.95Engine gasket degradation is one of the most common failure points in high-mileage builds, leading to compression loss, fluid leakage, and catastrophic engine damage if left unaddressed. The ATHENA Complete Gasket Kit delivers OEM-quality sealing across...400485850125- SKU:
- 400485850125
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $47.95Now: $43.00Was: $47.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850116
ATHENA
MSRP: $46.95Now: $42.00Was: $46.95A complete engine rebuild demands gasket integrity that won't compromise under extreme combustion pressures and temperature swings. The ATHENA Complete Gasket Kit delivers OEM-equivalent sealing performance across your top-end and complete engine...400485850116- SKU:
- 400485850116
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $46.95Now: $42.00Was: $46.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850089
ATHENA
MSRP: $34.95Now: $31.00Was: $34.95Engine gasket failure doesn't just cost you performance—it costs you reliability. The ATHENA Complete Gasket Kit delivers OEM-quality sealing across your entire top-end and engine rebuild, using proven materials engineered to withstand extreme...400485850089- SKU:
- 400485850089
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $34.95Now: $31.00Was: $34.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485850004
ATHENA
MSRP: $16.95Now: $15.00Was: $16.95When rebuilding your engine, gasket quality directly impacts seal integrity and longevity under extreme conditions. Athena's complete gasket kit eliminates the guesswork of sourcing individual components, delivering OEM-equivalent sealing with materials...400485850004- SKU:
- 400485850004
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
MSRP: $16.95Now: $15.00Was: $16.95 -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600267
ATHENA
MSRP: $33.95Now: $31.00Was: $33.95Engine refresh cycles are critical moments in racing—and the ATHENA Top End Gasket Kit is engineered to give you flexibility without compromise. Whether you're running stock compression on pump gas or stepping up to race fuel and higher boost, this kit...400485600267- SKU:
- 400485600267
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
MSRP: $33.95Now: $31.00Was: $33.95 -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600254
ATHENA
MSRP: $33.95Now: $31.00Was: $33.95Engine reliability directly impacts race day performance, and a compromised top end gasket kit can cost you valuable track time or worse—a DNF. The ATHENA Top End Gasket Kit (P400485600254) is engineered specifically for Yamaha platforms and lets you...400485600254- SKU:
- 400485600254
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $33.95Now: $31.00Was: $33.95Qty in Cart: 0Quantity:Price:MSRP: $33.95Now: $31.00Was: $33.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600133
ATHENA
MSRP: $11.95Now: $11.00Was: $11.95When you're preparing for race day, engine reliability is non-negotiable. The ATHENA Top End Gasket Kit gives you a complete, OEM-quality seal refresh specifically engineered for Yamaha engines, ensuring zero compression leakage whether you're running on...400485600133- SKU:
- 400485600133
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $11.95Now: $11.00Was: $11.95Qty in Cart: 0Quantity:Price:MSRP: $11.95Now: $11.00Was: $11.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600116
ATHENA
MSRP: $26.95Now: $24.00Was: $26.95Whether you're preparing for race day or executing a midseason engine refresh, the ATHENA Top End Gasket Kit keeps your engine sealed tight and operating at peak efficiency. This kit gives you the flexibility to run either standard fuel with stock...400485600116- SKU:
- 400485600116
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
MSRP: $26.95Now: $24.00Was: $26.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850500
ATHENA
MSRP: $57.95Now: $52.00Was: $57.95Engine gasket integrity is non-negotiable when rebuilding or maintaining high-performance engines—any compromise leads to compression loss, fluid seepage, and catastrophic failure. The ATHENA Complete Gasket Kit delivers OEM-quality sealing across your...400250850500- SKU:
- 400250850500
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $57.95Now: $52.00Was: $57.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850252/1
ATHENA
MSRP: $58.95Now: $53.00Was: $58.95Engine gasket failure can cost you a race and thousands in downtime. The ATHENA Complete Gasket Kit eliminates guesswork with precision-engineered sealing surfaces designed to handle sustained high-RPM abuse without weeping or blowout. This comprehensive...400250850252- SKU:
- 400250850252
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $58.95Now: $53.00Was: $58.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850251
ATHENA
MSRP: $68.95Now: $62.00Was: $68.95When rebuilding a Kawasaki engine, gasket failure isn't an option—it's a catastrophic outcome. The ATHENA Complete Gasket Kit delivers the seal integrity and thermal stability you need to run sustained high RPMs without worry. This comprehensive set...400250850251- SKU:
- 400250850251
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
MSRP: $68.95Now: $62.00Was: $68.95Qty in Cart: 0Quantity:Price:MSRP: $68.95Now: $62.00Was: $68.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850104
ATHENA
MSRP: $58.95Now: $53.00Was: $58.95When rebuilding a Kawasaki top-end or complete engine, gasket failure isn't an option—it compromises compression, causes oil seepage, and can force you back into the shop. The ATHENA Complete Gasket Kit eliminates guesswork by providing factory-spec...400250850104- SKU:
- 400250850104
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $58.95Now: $53.00Was: $58.95Qty in Cart: 0Quantity:Price:MSRP: $58.95Now: $53.00Was: $58.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850089
ATHENA
MSRP: $58.95Now: $53.00Was: $58.95Engine rebuilds demand precision—any leak or seal failure will compromise performance and reliability. The ATHENA Complete Gasket Kit delivers comprehensive top-end and full-engine gasket coverage with materials engineered to withstand extreme...400250850089- SKU:
- 400250850089
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $58.95Now: $53.00Was: $58.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850088/1
ATHENA
MSRP: $23.95Now: $22.00Was: $23.95Engine gasket failure compromises compression, causes oil leakage, and invites catastrophic overheating—especially under sustained high-RPM conditions. The ATHENA Complete Gasket Kit eliminates these risks with engineered materials designed to withstand...400250850088- SKU:
- 400250850088
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $23.95Now: $22.00Was: $23.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850009
ATHENA
MSRP: $85.00Now: $73.00Was: $85.00A complete top-end rebuild demands gasket materials engineered to withstand extreme pressure and temperature cycling—and Athena's kit delivers exactly that. Whether you're assembling a fresh long-block or refreshing a tired top-end, this comprehensive...400250850009- SKU:
- 400250850009
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
MSRP: $85.00Now: $73.00Was: $85.00Qty in Cart: 0Quantity:Price:MSRP: $85.00Now: $73.00Was: $85.00Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850008
ATHENA
MSRP: $55.95Now: $50.00Was: $55.95A complete gasket failure can sideline your engine and compromise reliability at the track or trail. The ATHENA Complete Gasket Kit delivers OEM-quality sealing across the entire top-end, using proven materials and construction methods that handle...400250850008- SKU:
- 400250850008
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
MSRP: $55.95Now: $50.00Was: $55.95Qty in Cart: 0Quantity:Price:MSRP: $55.95Now: $50.00Was: $55.95Subtotal:
