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...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...M810237- SKU:
- M810237
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$42.99 -
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...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...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
$36.95Water 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...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
$36.95 -
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...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...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,...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 -
On Sale
Cylinder Works Big Bore Gasket Kit 81mm Bore 2013-2015 KTM 250 SX-F 51004-G01
CYLINDER WORKS
MSRP: $128.95Now: $83.00Was: $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...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
MSRP: $128.95Now: $83.00Was: $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...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 -
On Sale
Cylinder Works Big Bore Gasket Kit Kawasaki KX450F 2009-2015 31011-G01
CYLINDER WORKS
MSRP: $89.95Now: $58.00Was: $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...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
MSRP: $89.95Now: $58.00Was: $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...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: $23.95Now: $20.00Was: $23.95A 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...400485600089- SKU:
- 400485600089
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
MSRP: $23.95Now: $20.00Was: $23.95 -
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...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...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...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: $181.95Now: $156.00Was: $181.95Engine 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...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: $181.95Now: $156.00Was: $181.95 -
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...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...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...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
