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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MOOSE RACING Complete Motor Gasket Kit - KX250 808457
MOOSE RACING
$70.11A complete engine rebuild demands precision gaskets and seals that won't compromise performance or longevity. The MOOSE RACING Complete Motor Gasket Kit gives you OEM-quality replacement seals and gaskets at a fraction of OEM pricing, allowing you to...M808457- SKU:
- M808457
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$70.11Qty in Cart: 0Quantity:Price:$70.11Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - RM80 808504
MOOSE RACING
$43.80A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work or your wallet. The MOOSE RACING Complete Motor Gasket Kit eliminates the frustration of sourcing individual components by bundling every...M808504- SKU:
- M808504
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$43.80Qty in Cart: 0Quantity:Price:$43.80Subtotal: -
MOOSE RACING Complete Motor Gasket Kit - RM85 808505
MOOSE RACING
$48.17A complete engine and transmission rebuild demands precision gaskets and seals that won't fail under load—and OEM replacements can drain your budget fast. The MOOSE RACING Complete Motor Gasket Kit delivers genuine OEM-quality seals and gaskets at a...M808505- SKU:
- M808505
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$48.17 -
MOOSE RACING Complete Motor Gasket Kit - RM125 808548
MOOSE RACING
$65.73A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your performance or reliability. The MOOSE RACING Complete Motor Gasket Kit eliminates the hassle of sourcing individual components, delivering every...M808548- SKU:
- M808548
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- ENGINE
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
$65.73 -
MOOSE RACING Complete Motor Gasket Kit - RM125 808549
MOOSE RACING
$83.24A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—this kit includes everything you need without the OEM price tag. Moose Racing's domestically manufactured gasket sets use high-tech materials...M808549- SKU:
- M808549
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- UNITS:
- KIT
$83.24 -
MOOSE RACING Complete Motor Gasket Kit - RMX250 808578
MOOSE RACING
$73.01A complete engine and transmission rebuild demands precision gasket fitment—any leak or seal failure compromises performance and reliability. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-equivalent quality at a fraction of the cost, giving you...M808578- SKU:
- M808578
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$73.01 -
MOOSE RACING Complete Motor Gasket Kit - RMX250 808579
MOOSE RACING
$73.01A complete engine and transmission rebuild requires gaskets and seals that won't compromise reliability or break your budget. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality seals at a fraction of OEM pricing, giving you the confidence to...M808579- SKU:
- M808579
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$73.01 -
MOOSE RACING Complete Motor Gasket Kit - RM250 808580
MOOSE RACING
$73.01A complete engine and transmission rebuild demands gasket and seal integrity—any leak or failure undermines months of work and thousands in parts investment. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality components at a fraction of OEM...M808580- SKU:
- M808580
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$73.01 -
MOOSE RACING Complete Motor Gasket Kit - YZ85 808614
MOOSE RACING
$43.80A complete engine and transmission rebuild demands precision gasket fitment and reliable sealing—any compromise risks oil leaks, loss of compression, and catastrophic failure. The MOOSE RACING Complete Motor Gasket Kit eliminates guesswork by providing...M808614- SKU:
- M808614
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$43.80 -
MOOSE RACING Top End Gasket Kit - CR500 810271
MOOSE RACING
$23.33A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or reliability. The MOOSE RACING Top End Gasket Kit gives you every component needed for a complete piston replacement at a fraction of OEM pricing, with...M810271- SKU:
- M810271
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$23.33Qty in Cart: 0Quantity:Price:$23.33Subtotal: -
MOOSE RACING Top End Gasket Kit - CR500R 810272
MOOSE RACING
$39.34When you're rebuilding a CR500R top end, every gasket and seal matters—poor fitment or inferior materials lead to leaks, compression loss, and wasted hours on the bench. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent seals and precision-cut...M810272- SKU:
- M810272
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$39.34 -
MOOSE RACING Top End Gasket Kit - CR500R 810273
MOOSE RACING
$45.27A top-end gasket kit is essential when rebuilding your CR500R—whether you're replacing a worn piston or performing routine maintenance. This Moose Racing kit delivers OEM-quality seals at a fraction of factory pricing, giving you the confidence to...M810273- SKU:
- M810273
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$45.27 -
MOOSE RACING Top End Gasket Kit - XR600 810280
MOOSE RACING
$70.25A top-end rebuild demands precision gaskets and seals that won't let you down mid-season. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, giving you the reliability of genuine seals with the affordability of...M810280- SKU:
- M810280
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$70.25 -
MOOSE RACING Top End Gasket Kit - 250SX/EXC 810300
MOOSE RACING
$32.09A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or your wallet. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of OEM pricing, letting you confidently refresh your...M810300- SKU:
- M810300
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$32.09 -
MOOSE RACING Top End Gasket Kit - KTM50SX 810301
MOOSE RACING
$24.85A top-end rebuild demands gasket and seal quality you can trust—especially when you're running a high-performance 50SX. This Moose Racing kit delivers OEM-equivalent reliability at a fraction of the cost, with every component engineered to handle the...M810301- SKU:
- M810301
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$24.85Qty in Cart: 0Quantity:Price:$24.85Subtotal: -
Cylinder Works Standard Bore Gasket Kit for Honda CRF450R 2017-2019 810989
CYLINDER WORKS
$79.22A complete engine rebuild demands gasket integrity—any compromise in sealing leads to oil weeping, coolant loss, and performance degradation. The Cylinder Works Standard Bore Gasket Kit delivers precision-engineered sealing surfaces and factory-grade...09346003- SKU:
- 09346003
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- STANDARD
- PRODUCT NAME:
- GASKET KIT
$79.22 -
Cylinder Works Big Bore Gasket Kit for Honda CRF250R 2018-2019 CW11011G01
CYLINDER WORKS
$66.95When you're running a big bore kit on your Honda CRF250R, your factory gasket set isn't engineered for the increased displacement, compression, and heat cycling—compromised sealing leads to oil weeps, air leaks, and lost performance gains. The Cylinder...09346344- SKU:
- 09346344
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- OVERSIZE (+3.00 MM)
- TYPE:
- CYLINDER HEAD
$66.95Qty in Cart: 0Quantity:Price:$66.95Subtotal: -
MOOSE RACING Top End Gasket Kit - KX80 810406
MOOSE RACING
$27.72A top-end rebuild demands precision 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-quality components at a fraction of OEM pricing, letting you refresh your KX80...M810406- SKU:
- M810406
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$27.72Qty in Cart: 0Quantity:Price:$27.72Subtotal: -
MOOSE RACING Top End Gasket Kit - KX/RM60 810407
MOOSE RACING
$23.33A top-end rebuild demands precision gaskets and seals—failure here means lost compression, oil weeping, and compromised performance. The MOOSE RACING Top End Gasket Kit gives you OEM-quality replacement seals at a fraction of factory cost, with every...M810407- SKU:
- M810407
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$23.33 -
MOOSE RACING Top End Gasket Kit - KE 100 810408
MOOSE RACING
$33.51A 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-equivalent reliability at a fraction of the price, with every component you need to...M810408- SKU:
- M810408
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
$33.51
