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 Exhaust Gasket Kit 823100
MOOSE RACING
$21.65MOOSE RACING Exhaust Gasket Kit09345299- SKU:
- 09345299
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
$21.65 -
MOOSE RACING Exhaust Gasket Kit 823101
MOOSE RACING
$21.87A quality exhaust gasket kit is essential for maintaining a proper seal between exhaust manifold and header components—preventing exhaust leaks that rob horsepower and create unwanted noise. The MOOSE RACING 823101 delivers OEM-grade sealing reliability...09345300- SKU:
- 09345300
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
$21.87 -
MOOSE RACING Exhaust Gasket Kit 823112
MOOSE RACING
$13.64A quality exhaust gasket kit is non-negotiable for maintaining a sealed exhaust system and preventing performance-robbing leaks. MOOSE RACING's 823112 gasket kit delivers factory-grade reliability with the durability needed for both street and track...09345311- SKU:
- 09345311
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- EXHAUST
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
$13.64 -
MOOSE RACING Exhaust Gasket Kit 823115
MOOSE RACING
$15.89A leaking or degraded exhaust gasket compromises both performance and reliability, allowing combustion gases to escape before reaching your exhaust system. MOOSE RACING's Exhaust Gasket Kit 823115 delivers OEM-quality sealing with the durability required...09345314- SKU:
- 09345314
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$15.89 -
MOOSE RACING Exhaust Gasket Kit 823116
MOOSE RACING
$16.37A proper exhaust seal is critical to maintaining peak engine performance and preventing exhaust leaks that rob horsepower and compromise air-fuel ratios. MOOSE RACING's exhaust gasket kit delivers OEM-quality sealing with materials engineered to...09345315- SKU:
- 09345315
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
$16.37 -
MOOSE RACING Exhaust Gasket Kit 823121
MOOSE RACING
$16.37A compromised exhaust gasket is one of the easiest ways to lose power, invite exhaust leaks, and watch your engine's efficiency tank. The MOOSE RACING Exhaust Gasket Kit 823121 seals the critical junctions in your exhaust system, eliminating leaks that...09345320- SKU:
- 09345320
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
$16.37 -
MOOSE RACING Exhaust Gasket Kit 823139
MOOSE RACING
$21.65A compromised exhaust seal leads to performance loss, increased emissions, and potential engine damage. This MOOSE RACING gasket kit ensures a perfect seal at all exhaust manifold joints, restoring combustion efficiency and eliminating troublesome leaks...09345321- SKU:
- 09345321
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
$21.65 -
MOOSE RACING Exhaust Gasket Kit 823140
MOOSE RACING
$21.65A quality exhaust gasket kit is essential for maintaining proper sealing between exhaust manifold and cylinder head, preventing exhaust leaks that reduce performance and increase emissions. Over time, heat cycling degrades stock gaskets, leading to power...09345322- SKU:
- 09345322
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET KIT
$21.65 -
MOOSE RACING Exhaust Gasket Kit 823141
MOOSE RACING
$21.65A compromised exhaust gasket can silently rob your engine of power through leaks, unburned fuel, and sensor errors that throw off your tune. MOOSE RACING's Exhaust Gasket Kit 823141 delivers OEM-equivalent sealing integrity to eliminate leaks at critical...09345323- SKU:
- 09345323
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
- PRODUCT NAME:
- GASKET KIT
$21.65 -
MOOSE RACING Exhaust Gasket Kit 823144
MOOSE RACING
$21.87A properly sealed exhaust system is critical to maintaining peak engine performance and preventing costly air leaks that rob horsepower. MOOSE RACING's Exhaust Gasket Kit ensures a clean, reliable seal at every joint, eliminating exhaust bypass that...09345326- SKU:
- 09345326
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- EXHAUST
- UNITS:
- KIT
$21.87Qty in Cart: 0Quantity:Price:$21.87Subtotal: -
MOOSE RACING Exhaust Gasket Kit 823145
MOOSE RACING
$21.65A compromised exhaust gasket can silently undermine your engine's performance, causing air leaks that disrupt fuel mapping and reduce horsepower. The MOOSE RACING Exhaust Gasket Kit 823145 provides OEM-quality sealing across your exhaust system, ensuring...09345327- SKU:
- 09345327
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- EXHAUST
$21.65Qty in Cart: 0Quantity:Price:$21.65Subtotal: -
MOOSE RACING Head Cover Gasket - Honda 817865
MOOSE RACING
$13.50Valve cover gaskets fail silently—until they don't. Oil leaks compromise engine cleanliness, reduce performance, and invite costly damage. The MOOSE RACING Head Cover Gasket delivers OEM-grade sealing at a fraction of OEM pricing, so you can rebuild with...09346172- SKU:
- 09346172
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- VALVE COVER
- PRODUCT NAME:
- GASKET
$13.50 -
MOOSE RACING Head Cover Gasket - Honda 817867
MOOSE RACING
$13.02A leaking valve cover gasket compromises engine sealing and creates messy oil seepage that damages surrounding components. MOOSE RACING Head Cover Gaskets deliver OEM-equivalent performance at a fraction of the cost, allowing you to rebuild with...09346173- SKU:
- 09346173
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- RUBBER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$13.02Qty in Cart: 0Quantity:Price:$13.02Subtotal: -
MOOSE RACING Gasket Material 403-5013
MOOSE RACING
$34.29A quality gasket material is fundamental to maintaining engine integrity and preventing costly fluid leaks that compromise performance and reliability. MOOSE RACING's gasket material delivers consistent sealing performance across critical engine...09346977- SKU:
- 09346977
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET MATERIAL
$34.29 -
MOOSE RACING Top End Gasket Kit - YZF/WR250 810671
MOOSE RACING
$59.12When you're rebuilding a YZF/WR250 top end, gasket failure isn't an option. This Moose Racing kit gives you OEM-quality seals and gaskets at a fraction of the cost, with high-tech materials engineered to handle the demands of competition and hard riding...M810671- SKU:
- M810671
- Availability:
- Ships Same Business Day
- Weight:
- 2.25 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
$59.12 -
MOOSE RACING Top End Gasket Kit - CR250R 810254
MOOSE RACING
$24.85A top-end rebuild demands precision—and cutting corners on gaskets and seals is how engines fail. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, letting you tackle piston replacements and engine refreshes...M810254- SKU:
- M810254
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$24.85Qty in Cart: 0Quantity:Price:$24.85Subtotal: -
MOOSE RACING Top End Gasket Kit - KTM 300 810306
MOOSE RACING
$31.77When you're rebuilding a KTM 300 top end, using OEM-equivalent gaskets and seals from Moose Racing ensures proper fitment, reliable compression, and a leak-free engine without the OEM price tag. This complete gasket kit gives you everything needed for a...M810306- SKU:
- M810306
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$31.77 -
MOOSE RACING Top End Gasket Kit - RM 125 810541
MOOSE RACING
$18.96A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-quality performance at a fraction of OEM pricing, giving you the confidence to rebuild...M810541- SKU:
- M810541
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$18.96 -
MOOSE RACING Gasket Material 403-5015
MOOSE RACING
$46.41Engine gasket failure leads to oil leaks, compression loss, and catastrophic engine damage—all preventable with quality gasket material. MOOSE RACING Gasket Material 403-5015 is engineered for precision fitment and reliable sealing across multiple engine...09346978- SKU:
- 09346978
- Availability:
- Ships Same Business Day
- Weight:
- 1.55 LBS
- THICKNESS:
- 0,062'
- THICKNESS IMPERIAL:
- 0.062'
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET MATERIAL
- RIDING STYLE:
- OFF-ROAD
$46.41 -
MOOSE RACING Clutch Cover Gasket 817486
MOOSE RACING
$10.29A leaking clutch cover gasket compromises engine sealing and can lead to oil loss and contamination—exactly why you need a precision replacement that matches OEM specifications. The MOOSE RACING Clutch Cover Gasket 817486 uses high-tech materials...M817486- SKU:
- M817486
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$10.29
