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
-
MOOSE RACING Top End Gasket Kit - CR125 810236
MOOSE RACING
$41.54When you're rebuilding a CR125 top end, precision gaskets and seals aren't optional—they're essential to engine integrity and reliability. This Moose Racing kit eliminates the guesswork by including every gasket, O-ring, and seal you need in one package,...M810236- SKU:
- M810236
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$41.54 -
MOOSE RACING Top End Gasket Kit - CR125R 810237
MOOSE RACING
$42.99A top-end rebuild demands precision gaskets and seals that won't fail mid-season—this Moose Racing kit delivers OEM-quality components at a fraction of dealership pricing. Whether you're refreshing a worn engine or upgrading compression, every gasket,...M810237- SKU:
- M810237
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$42.99Qty in Cart: 0Quantity:Price:$42.99Subtotal: -
MOOSE RACING Top End Gasket Kit - XR200 810240
MOOSE RACING
$49.88A top-end rebuild demands precision-fit gaskets and seals that won't compromise your engine's integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent performance at a fraction of the price, with high-tech materials...M810240- SKU:
- M810240
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$49.88 -
MOOSE RACING Top End Gasket Kit - CR450/480R 810270
MOOSE RACING
$23.33A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or leak under pressure. The MOOSE RACING Top End Gasket Kit eliminates guesswork with a complete, U.S.-manufactured set engineered specifically for the...M810270- SKU:
- M810270
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$23.33 -
K&S TECHNOLOGIES Water Pump Repair Gasket Kit - CRF450R 75-1001
K&S TECHNOLOGIES
$33.95Water pump failures don't wait for convenient timing—they strand you trackside or leave your engine at risk of catastrophic damage. This K&S Technologies gasket kit gives you everything needed to restore your CRF450R's water pump to OEM specifications...09341909- SKU:
- 09341909
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
$33.95 -
K&S TECHNOLOGIES Water Pump Repair Gasket Kit - CRF250R 75-1002
K&S TECHNOLOGIES
$36.95A failing water pump gasket kit leads to coolant leaks, overheating, and potential engine damage—problems that compound quickly on the track or trail. The K&S Technologies Water Pump Repair Gasket Kit supplies all factory-spec seals and O-rings needed to...09341910- SKU:
- 09341910
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP REPAIR
- PRODUCT NAME:
- GASKET KIT
$36.95Qty in Cart: 0Quantity:Price:$36.95Subtotal: -
Cylinder Works Big Bore Gasket Kit 2016-2018 Husqvarna FC350 KTM 350 SX-F 350 XC-F 51007-G01
CYLINDER WORKS
$135.95Enhance your engine's performance with the CYLINDER WORKS Gasket Kit Big Bore 51007-G01, proudly made in the U.S.A. This high-quality gasket kit is designed to provide a perfect seal for your big bore engine, ensuring optimal performance and longevity...09346006- SKU:
- 09346006
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- OVERSIZE (+2.00 MM)
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- CYLINDER
$135.95 -
Cylinder Works Big Bore Gasket Kit 2010-2022 Suzuki RM-Z250 80.00mm Bore 41004-G01
CYLINDER WORKS
$68.95Upgrade your engine's performance with the CYLINDER WORKS Big Bore Gasket Kit 41004-G01. This ready-to-install kit features high-quality components that ensure a perfect fit and enhanced durability, allowing you to experience improved power and...09342151- SKU:
- 09342151
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- NICKEL SILICON CARBIDE
- STYLE:
- BIG BORE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE METRIC:
- OVERSIZED (+3.00 MM)
- PRODUCT NAME:
- GASKET KIT
$68.95 -
Cylinder Works Big Bore Gasket Kit 81mm Bore 2013-2015 KTM 250 SX-F 51004-G01
CYLINDER WORKS
$128.95Enhance your engine's performance with the CYLINDER WORKS Big Bore Gasket Kit 51004-G01. This ready-to-install kit offers a seamless upgrade, featuring components that mirror OEM specifications while delivering superior durability and efficiency...09343130- SKU:
- 09343130
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- NICKEL SILICON CARBIDE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- STYLE:
- BIG BORE
- UNITS:
- KIT
$128.95 -
Cylinder Works Big Bore Gasket Kit Yamaha YZ250F 2014-2018 21010-G01
CYLINDER WORKS
$99.95Upgrade your engine's performance with the CYLINDER WORKS Big Bore Gasket Kit 21010-G01. This complete kit offers a seamless, direct bolt-on solution that enhances power without the need for extensive modifications. Crafted for durability and efficiency,...09344052- SKU:
- 09344052
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- BIG BORE
- MATERIAL:
- NICKEL SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- TOP END
$99.95 -
Cylinder Works Big Bore Gasket Kit Kawasaki KX450F 2009-2015 31011-G01
CYLINDER WORKS
$89.95Upgrade your engine with the CYLINDER WORKS Big Bore Gasket Kit 31011-G01, designed for effortless installation and enhanced performance. This kit features high-quality components that mirror OEM specifications, ensuring a seamless fit and optimal...09344056- SKU:
- 09344056
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- BIG BORE
- MATERIAL:
- NICKEL SILICON CARBIDE
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
$89.95 -
BLOWSION Base Gasket - .020" - Kawasaki 750/800 01-03-302
BLOWSION
$29.95A reliable base gasket is critical to maintaining crankcase integrity and preventing blowouts during high-rpm operation. The BLOWSION .020" base gasket eliminates messy gasket sealants and delivers a reusable, metal-core design that withstands repeated...09344575- SKU:
- 09344575
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- MODEL:
- SUPER
- THICKNESS:
- 0,51 MM (0,020')
$29.95Qty in Cart: 0Quantity:Price:$29.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Yamaha P400485600089
ATHENA
MSRP: $21.95Now: $20.00Was: $21.95A fresh top end gasket kit is essential maintenance between races or at midseason to ensure your engine maintains peak seal integrity and compression consistency. The ATHENA P400485600089 gives you the flexibility to run standard fuel with stock...400485600089- SKU:
- 400485600089
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
MSRP: $21.95Now: $20.00Was: $21.95 -
On Sale
ATHENA Top End Gasket Kit - Kawasaki P400250600069
ATHENA
MSRP: $89.95Now: $81.00Was: $89.95When you're preparing for race day, engine reliability can't be left to chance. The ATHENA Top End Gasket Kit is engineered for riders who demand precision between rebuilds—whether you're freshening your top end mid-season or preparing for competition...09346466- SKU:
- 09346466
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $89.95Now: $81.00Was: $89.95 -
On Sale
ATHENA Complete Gasket Kit - Kawasaki P400250900069
ATHENA
MSRP: $260.95Now: $235.00Was: $260.95A failed gasket can compromise your entire engine—leading to coolant leaks, oil seepage, and catastrophic performance loss. The ATHENA Complete Gasket Kit delivers the sealing integrity your Kawasaki P400 demands, engineered with multi-layer construction...09346467- SKU:
- 09346467
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $260.95Now: $235.00Was: $260.95 -
On Sale
ATHENA Race Gasket Kit - Kawasaki R2506-069
ATHENA
MSRP: $54.95Now: $49.00Was: $54.95Whether you're prepping for race day or executing a mid-season engine refresh, the ATHENA Race Gasket Kit gives you the flexibility to optimize your engine's compression ratio without a complete rebuild. This kit includes a premium MLSS head gasket and...09346469- SKU:
- 09346469
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $54.95Now: $49.00Was: $54.95 -
On Sale
ATHENA Complete Gasket Kit - Yamaha P400485900213
ATHENA
MSRP: $172.95Now: $156.00Was: $172.95Engine gasket failure compromises compression, causes coolant and oil leaks, and can lead to catastrophic internal damage if not addressed. The ATHENA Complete Gasket Kit provides OEM-equivalent sealing across your entire top-end assembly, ensuring...09346471- SKU:
- 09346471
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $172.95Now: $156.00Was: $172.95 -
On Sale
ATHENA Race Gasket Kit - Yamaha R4856-213
ATHENA
MSRP: $72.95Now: $66.00Was: $72.95Engine gasket degradation is one of the most common reasons for compression loss and mid-season performance drops. The ATHENA Race Gasket Kit R4856-213 gives you the precision components to refresh your top-end without a complete rebuild, letting you...09346472- SKU:
- 09346472
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- ENGINE
- UNITS:
- KIT
MSRP: $72.95Now: $66.00Was: $72.95 -
On Sale
ATHENA Race Gasket Kit - Honda R2106-317
ATHENA
MSRP: $75.55Now: $65.00Was: $75.55High-revving engines demand gaskets that can handle sustained combustion pressures without failure—and the ATHENA Race Gasket Kit delivers exactly that. Built with rubber-coated spring steel and engineered for extreme thermal cycling, this kit maintains...09345462- SKU:
- 09345462
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
MSRP: $75.55Now: $65.00Was: $75.55Qty in Cart: 0Quantity:Price:MSRP: $75.55Now: $65.00Was: $75.55Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600317
ATHENA
MSRP: $82.95Now: $75.00Was: $82.95A failing head gasket can compromise your entire engine's integrity, leading to coolant leaks, combustion blow-by, and catastrophic overheating. The ATHENA Top End Gasket Kit uses advanced rubber-coated spring steel construction to maintain a consistent,...09345463- SKU:
- 09345463
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
MSRP: $82.95Now: $75.00Was: $82.95
