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 - RM 250 810582
MOOSE RACING
$43.80A 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 the cost, giving you the confidence to reassemble...M810582- SKU:
- M810582
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$43.80 -
MOOSE RACING Top End Gasket Kit - RM 250 810583
MOOSE RACING
$43.80A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost your wallet. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of dealer pricing, giving you the reliability needed for...M810583- SKU:
- M810583
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$43.80 -
MOOSE RACING Motor Gasket Kit with Seal - CR125R 811237
MOOSE RACING
$98.63A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your work or wallet. The MOOSE RACING Motor Gasket Kit delivers OEM-quality components at a fraction of dealership pricing, letting you rebuild with...M811237- SKU:
- M811237
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$98.63 -
MOOSE RACING Motor Gasket Kit with Seal - CR250 811252
MOOSE RACING
$60.50A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your performance or reliability. MOOSE Racing delivers OEM-equivalent components at a fraction of OEM pricing, letting you rebuild with confidence...M811252- SKU:
- M811252
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$60.50 -
MOOSE RACING Motor Gasket Kit with Seal - CR250 811253
MOOSE RACING
$91.46A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work or your wallet. MOOSE Racing delivers OEM-equivalent components at a fraction of dealership pricing, so you can rebuild with confidence knowing...M811253- SKU:
- M811253
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$91.46Qty in Cart: 0Quantity:Price:$91.46Subtotal: -
MOOSE RACING Top End Gasket Kit - KDX 200 810440
MOOSE RACING
$35.01A top-end rebuild demands precision gaskets and seals that won't fail under race conditions or heavy use. The MOOSE RACING Top End Gasket Kit eliminates guesswork by providing every component needed for a complete, reliable engine refresh at a fraction...M810440- SKU:
- M810440
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
$35.01 -
MOOSE RACING Top End Gasket Kit - KDX 200C 810441
MOOSE RACING
$35.01A top-end rebuild demands precision and reliability—settling for inferior gaskets invites oil leaks, compression loss, and premature failure. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent sealing across your entire cylinder head and valve...M810441- SKU:
- M810441
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
$35.01 -
MOOSE RACING Top End Gasket Kit - KDX 200C 810442
MOOSE RACING
$35.01A top-end rebuild demands precision and reliability—Moose Racing delivers both with OEM-quality seals and gaskets at a fraction of OEM pricing. This complete gasket kit eliminates the hassle of sourcing individual components, giving you confidence that...M810442- SKU:
- M810442
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
$35.01 -
MOOSE RACING Top End Gasket Kit - KDX 220 810445
MOOSE RACING
$35.01A top-end rebuild demands precision gaskets and seals that won't fail under race conditions. The MOOSE RACING Top End Gasket Kit gives you OEM-quality components at a fraction of factory pricing, so you can confidence-rebuild your KDX 220 without cutting...M810445- SKU:
- M810445
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- TOP END
$35.01 -
MOOSE RACING Top End Gasket Kit - KX 250 810452
MOOSE RACING
$29.14A quality top-end gasket kit is essential when rebuilding your KX 250 engine—compromising here with inferior seals leads to oil leaks, compression loss, and premature failure. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent reliability at a...M810452- SKU:
- M810452
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$29.14Qty in Cart: 0Quantity:Price:$29.14Subtotal: -
MOOSE RACING Top End Gasket Kit - KX 250 810453
MOOSE RACING
$36.47A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or performance. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, giving you the confidence to refresh your...M810453- SKU:
- M810453
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$36.47Qty in Cart: 0Quantity:Price:$36.47Subtotal: -
MOOSE RACING Top End Gasket Kit - RM 250 810576
MOOSE RACING
$37.94A top-end rebuild demands precision components that won't compromise engine integrity or your wallet. The MOOSE RACING Gasket Kit delivers OEM-quality seals and gaskets at a fraction of the cost, giving you the reliability needed for consistent...M810576- SKU:
- M810576
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$37.94Qty in Cart: 0Quantity:Price:$37.94Subtotal: -
MOOSE RACING Top End Gasket Kit - RMX 250 810578
MOOSE RACING
$37.94A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. This MOOSE RACING kit gives you every component needed for a complete piston replacement—all made to OEM specifications at a fraction of...M810578- SKU:
- M810578
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$37.94 -
MOOSE RACING Top End Gasket Kit - RMX 250 810579
MOOSE RACING
$37.94A top-end rebuild demands precision gaskets and seals—cheap alternatives lead to leaks, compression loss, and premature failure. The MOOSE RACING Top End Gasket Kit delivers OEM-quality seals at a fraction of dealer pricing, allowing you to restore your...M810579- SKU:
- M810579
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$37.94 -
MOOSE RACING Top End Gasket Kit - RM 250 810580
MOOSE RACING
$43.80A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or performance. The MOOSE RACING Top End Gasket Kit gives you OEM-quality components at a fraction of the cost, eliminating the guesswork and ensuring...M810580- SKU:
- M810580
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$43.80 -
MOOSE RACING Top End Gasket Kit - RM 250 810581
MOOSE RACING
$39.34When you're rebuilding a two-stroke top end, gasket integrity directly impacts compression, sealing, and engine longevity. The MOOSE RACING Top End Gasket Kit eliminates the guesswork by bundling every critical seal and gasket you need for a complete,...M810581- SKU:
- M810581
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$39.34 -
MOOSE RACING Complete Motor Gasket Kit - PW50 808601
MOOSE RACING
$23.33A complete engine and transmission rebuild demands precision gaskets and seals that won't fail under racing conditions or daily duty. This Moose Racing kit eliminates the guesswork of sourcing individual components by bundling everything you need in one...09346102- SKU:
- 09346102
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$23.33 -
MOOSE RACING Complete Motor Gasket Kit - YZ450F/WR450F 808687
MOOSE RACING
$134.80A complete engine and transmission rebuild demands precision gaskets and seals that won't fail mid-season. The MOOSE RACING Complete Motor Gasket Kit delivers OEM-quality components at a fraction of the cost, so you can confidently reassemble your YZ450F...09346103- SKU:
- 09346103
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$134.80 -
MOOSE RACING Water Pump Rebuild Kit 821376
MOOSE RACING
$42.52A failing water pump can compromise your entire cooling system, leading to catastrophic engine damage and costly downtime. This MOOSE Racing rebuild kit supplies every gasket, seal, bearing, and O-ring needed to restore your water pump to factory...09345909- SKU:
- 09345909
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REPAIR KIT
- TYPE:
- WATER PUMP
$42.52 -
MOOSE RACING Motor Gasket Kit with Seal - CR250 811259
MOOSE RACING
$80.14A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work. MOOSE Racing delivers OEM-equivalent quality at a fraction of OEM pricing, so you can confidently reassemble your CR250 without cutting...M811259- SKU:
- M811259
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$80.14
