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 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...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...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...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...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...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...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...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...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...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...M810271- SKU:
- M810271
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$23.33 -
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...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...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...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...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...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...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...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...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...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...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
