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 - KTM P400270600028
ATHENA
MSRP: $77.95Now: $70.00Was: $77.95Engine refresh cycles are critical to maintaining peak performance between races, and the ATHENA Top End Gasket Kit gives you the flexibility to tune your compression ratio based on fuel availability and track conditions. Whether you're running on pump...09342346- SKU:
- 09342346
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $77.95Now: $70.00Was: $77.95 -
On Sale
ATHENA Top End Gasket Kit - KTM P400270600045
ATHENA
MSRP: $50.95Now: $46.00Was: $50.95Whether 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 without a full rebuild. Choose standard fuel with stock compression for reliability,...09342341- SKU:
- 09342341
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $50.95Now: $46.00Was: $50.95 -
On Sale
ATHENA Complete Gasket Kit - KTM P400270850045
ATHENA
MSRP: $116.95Now: $105.00Was: $116.95A complete engine rebuild demands gaskets that won't fail under extreme operating conditions. The ATHENA Complete Gasket Kit delivers OEM-equivalent sealing integrity with materials engineered to handle sustained high temperatures and pressure cycles...09342337- SKU:
- 09342337
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- ENGINE TYPE:
- -
- UNITS:
- KIT
MSRP: $116.95Now: $105.00Was: $116.95Qty in Cart: 0Quantity:Price:MSRP: $116.95Now: $105.00Was: $116.95Subtotal: -
On Sale
ATHENA Gasket Kit - CRF150R P400210160019
ATHENA
MSRP: $64.95Now: $58.00Was: $64.95The ATHENA Gasket Kit is engineered for riders who demand reliability and thermal stability from their CRF150R. Factory gaskets degrade under sustained heat and load—this complete kit replaces worn sealing surfaces and pairs with an optimized aluminum...09341968- SKU:
- 09341968
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE METRIC:
- 69.00 MM
- TYPE:
- TOP END
- BORE SIZE:
- 69,00 MM
- DISPLACEMENT:
- 163.5 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $64.95Now: $58.00Was: $64.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250850024
ATHENA
MSRP: $185.95Now: $167.00Was: $185.95A complete gasket kit is essential for any top-end or full engine rebuild—worn gaskets are a leading cause of compression loss, oil leaks, and coolant seepage that compromise performance and reliability. The ATHENA P400250850024 delivers OEM-quality...09341964- SKU:
- 09341964
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- -
- PRODUCT NAME:
- GASKET KIT
MSRP: $185.95Now: $167.00Was: $185.95 -
Cylinder Works Standard Bore Gasket Kit 810944
CYLINDER WORKS
$80.70A worn or damaged gasket kit compromises compression, increases blow-by, and accelerates engine wear—costing you performance and reliability. The Cylinder Works Standard Bore Gasket Kit 810944 delivers a complete, matched-component solution that restores...09341939- SKU:
- 09341939
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- STYLE:
- STANDARD
- TYPE:
- TOP END
- UNITS:
- KIT
- MATERIAL:
- NICKEL SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
$80.70 -
K&S TECHNOLOGIES Water Pump Repair Gasket Kit - YZ250F 75-4004
K&S TECHNOLOGIES
$35.65A leaking water pump can compromise your YZ250F's cooling system and derail race day performance. This K&S Technologies gasket kit supplies all OEM-spec seals and O-rings needed to restore a watertight seal without replacing the entire pump assembly. Get...09341924- SKU:
- 09341924
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
$35.65Qty in Cart: 0Quantity:Price:$35.65Subtotal: -
COMETIC Gasket Set - 95 mm - Yamaha C7908-EST
COMETIC
$89.95A quality gasket set is non-negotiable when you're rebuilding a top end—it's the seal between raw power and catastrophic failure. The COMETIC C7908-EST delivers the sealing reliability you need for high-output 4-stroke engines, whether naturally...09340933- SKU:
- 09340933
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- BORE SIZE METRIC:
- 95.00 MM
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
$89.95Qty in Cart: 0Quantity:Price:$89.95Subtotal: -
COMETIC Gasket Set - 77 mm - Yamaha C7905-EST
COMETIC
$83.95High-output 4-stroke engines demand gasket solutions engineered for extreme cylinder pressures and heat cycles. The COMETIC C7905-EST Gasket Set delivers reliable sealing across naturally aspirated and forced-induction applications, preventing blowby and...09340932- SKU:
- 09340932
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
$83.95 -
COMETIC Gasket Set - 78 mm - Honda C3133-EST
COMETIC
$84.95Factory gaskets can't handle the cylinder pressures generated by high-output 4-stroke engines, whether naturally aspirated or boosted. The COMETIC C3133-EST gasket set uses multi-layered steel construction with Extreme Sealing Technology (EST) to...09340920- SKU:
- 09340920
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 78.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$84.95 -
COMETIC Gasket Set - 96 mm - Honda C3047-EST
COMETIC
$88.95When running high-output forced induction or naturally aspirated builds, your factory gasket set becomes a liability. The COMETIC C3047-EST Gasket Set uses advanced multi-layered steel construction with EST (Extreme Sealing Technology) to handle extreme...09340905- SKU:
- 09340905
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE METRIC:
- 96.00 MM
$88.95Qty in Cart: 0Quantity:Price:$88.95Subtotal: -
On Sale
ATHENA Cylinder Gasket Kit - Yamaha 070203/1
ATHENA
MSRP: $14.95Now: $13.00Was: $14.95When you've committed to a 70cc big bore conversion on your Yamaha, a compromised cylinder gasket is a silent performance killer—leaking compression, oil, and coolant before you even notice. The ATHENA Cylinder Gasket Kit 070203/1 is engineered...09340639- SKU:
- 09340639
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
MSRP: $14.95Now: $13.00Was: $14.95 -
On Sale
ATHENA Cylinder Gasket Kit - Yamaha 070103/1
ATHENA
MSRP: $14.95Now: $13.00Was: $14.95When you've upgraded to an Athena 70cc big bore kit, maintaining a reliable seal between your cylinder and head is critical to preserving compression and preventing coolant or oil leakage. This OEM-equivalent gasket kit ensures a proper fit and long-term...09340638- SKU:
- 09340638
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $14.95Now: $13.00Was: $14.95 -
COMETIC Top End Gasket Kit C7181
COMETIC
$51.95A quality gasket kit is the foundation of a reliable top end—poor sealing leads to compression loss, oil leakage, and catastrophic engine failure. The COMETIC C7181 uses multi-layered steel construction with Viton rubber coating to handle extreme...09340315- SKU:
- 09340315
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- THICKNESS IMPERIAL:
- 0,012'
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 54.00 MM
- THICKNESS METRIC:
- 0.31 MM
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$51.95 -
WINDEROSA Top End Gasket Kit - SL/SLTX1100 610806
WINDEROSA
$67.05Top-end gasket failure leads to compression loss, oil leaks, and catastrophic engine damage—replacing them preventatively with a complete OEM-quality kit saves you thousands in rebuild costs. The WINDEROSA Top End Gasket Kit gives you all the critical...09340271- SKU:
- 09340271
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- UNITS:
- KIT
$67.05 -
On Sale
ATHENA Gasket - KLX/DRZ/KFX/LTZ400 P400510160002
ATHENA
MSRP: $133.95Now: $121.00Was: $133.95Stock gaskets wear down under sustained performance use, leading to coolant leaks and compromised sealing integrity that can damage your engine. The ATHENA Gasket Kit is engineered specifically for KLX, DRZ, KFX, and LTZ400 platforms to deliver reliable...09340194- SKU:
- 09340194
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- BORE SIZE:
- 94,00 MM
- RIDING STYLE:
- STREET
- BORE SIZE METRIC:
- 94.00 MM
- DISPLACEMENT:
- 435 CC
- RIDING STYLE:
- OFF-ROAD
MSRP: $133.95Now: $121.00Was: $133.95Qty in Cart: 0Quantity:Price:MSRP: $133.95Now: $121.00Was: $133.95Subtotal: -
On Sale
ATHENA Cylinder Gasket Kit - KX125 P400250160001
ATHENA
MSRP: $57.95Now: $52.00Was: $57.95Maintain peak performance and reliability with the ATHENA Cylinder Gasket Kit, engineered to restore your KX125 to factory specifications or exceed them with premium materials. The nickel-carbide coated aluminum cylinder and molybdenum-coated forged...09340190- SKU:
- 09340190
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE:
- 54,00 MM
- BORE SIZE METRIC:
- 54.00 MM
- TYPE:
- TOP END
MSRP: $57.95Now: $52.00Was: $57.95 -
On Sale
ATHENA Oil Seal Gasket Kit - Kawasaki P400250400069
ATHENA
MSRP: $57.95Now: $52.00Was: $57.95Engine seals and gaskets are critical wear items that directly impact oil retention, combustion efficiency, and overall engine longevity. A degraded or leaking seal compromises compression and allows contamination into your oil system—problems that...09346468- SKU:
- 09346468
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $57.95Now: $52.00Was: $57.95 -
VESRAH Complete Gasket Kit - KE/KV 100 VG-444
VESRAH
$31.49Engine gasket failure leads to oil leaks, compression loss, and catastrophic damage—often at the worst possible moment. The VESRAH VG-444 Complete Gasket Kit eliminates guesswork during top-end rebuilds by supplying every critical seal your KE/KV 100...VG444- SKU:
- VG444
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$31.49Qty in Cart: 0Quantity:Price:$31.49Subtotal: -
VESRAH Complete Gasket Kit - DT100 VG-292
VESRAH
$26.36Engine gasket failure doesn't just leak—it compromises compression, contaminates your oil, and forces you back into the shop. The VESRAH Complete Gasket Kit VG-292 provides all the sealing components needed for a thorough engine rebuild, ensuring your...VG292- SKU:
- VG292
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- PRODUCT NAME:
- GASKET
- UNITS:
- SET
- TYPE:
- COMPLETE
$26.36Qty in Cart: 0Quantity:Price:$26.36Subtotal:
