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 Motor Gasket Kit with Seal - RM80 811504
MOOSE RACING
$60.28Engine and transmission rebuilds demand precision gaskets and seals that won't compromise your work—OEM-quality components at a fraction of the cost. This Moose Racing motor gasket kit eliminates the guesswork and expense of sourcing individual seals and...M811504- SKU:
- M811504
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$60.28 -
MOOSE RACING Motor Gasket Kit with Seal - RM85 811505
MOOSE RACING
$64.62A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your RM85's reliability. MOOSE Racing delivers OEM-equivalent quality at a fraction of the cost, giving you the confidence to rebuild without cutting...M811505- SKU:
- M811505
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$64.62 -
MOOSE RACING Motor Gasket Kit with Seal - RM125 811543
MOOSE RACING
$73.14A complete engine and transmission rebuild demands precision-fit gaskets and seals—compromising on quality here means risking oil leaks, combustion loss, and catastrophic failures down the line. MOOSE Racing delivers OEM-equivalent performance at a...M811543- SKU:
- M811543
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$73.14Qty in Cart: 0Quantity:Price:$73.14Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - RM125 811547
MOOSE RACING
$81.49A complete engine and transmission rebuild demands precision gaskets and seals that fit right the first time—factory tolerances with aftermarket affordability. MOOSE Racing delivers genuine OEM-specification seals paired with U.S.-manufactured gaskets,...M811547- SKU:
- M811547
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- TYPE:
- ENGINE
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
$81.49 -
MOOSE RACING Motor Gasket Kit with Seal - YZ125 811635
MOOSE RACING
$70.33A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your engine's integrity or your wallet. The MOOSE RACING Motor Gasket Kit delivers OEM-quality components at a fraction of the cost, giving you the...M811635- SKU:
- M811635
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$70.33 -
MOOSE RACING Motor Gasket Kit with Seal - YZ125 811636
MOOSE RACING
$73.17A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—OEM-quality parts at a fraction of the cost. Moose Racing delivers genuine replacement seals paired with domestically-manufactured gaskets, so...M811636- SKU:
- M811636
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
$73.17 -
MOOSE RACING Motor Gasket Kit with Seal - YZ125 811637
MOOSE RACING
$58.79A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—or your wallet. MOOSE RACING's comprehensive gasket kit delivers OEM-equivalent performance at a fraction of the cost, giving you confidence...M811637- SKU:
- M811637
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$58.79Qty in Cart: 0Quantity:Price:$58.79Subtotal: -
MOOSE RACING Top End Gasket Kit - KX 250 810455
MOOSE RACING
$48.17When you're rebuilding a KX 250 top end, OEM gasket kits come with sticker shock. The MOOSE RACING Top End Gasket Kit delivers complete coverage at a fraction of the cost—without sacrificing the precision fit and material quality your engine demands...M810455- SKU:
- M810455
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$48.17 -
MOOSE RACING Top End Gasket Kit - KX 250 810456
MOOSE RACING
$48.17A top-end rebuild demands precision—mismatched or worn gaskets compromise compression, invite oil leakage, and undermine engine reliability. The MOOSE RACING Top End Gasket Kit eliminates guesswork by supplying every gasket, seal, and O-ring your KX 250...M810456- SKU:
- M810456
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$48.17 -
MOOSE RACING Top End Gasket Kit - RM 125 810548
MOOSE RACING
$28.65A top-end rebuild demands precision gaskets and seals that maintain compression integrity and prevent leakage under race conditions. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, giving you the reliability...M810548- SKU:
- M810548
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$28.65Qty in Cart: 0Quantity:Price:$28.65Subtotal: -
MOOSE RACING Top End Gasket Kit - RM 250 810571
MOOSE RACING
$18.96A top-end rebuild demands precision gaskets and seals that maintain compression integrity and prevent leakage under racing conditions. The MOOSE RACING kit eliminates the guesswork by supplying every gasket, O-ring, and seal you need in one package—all...M810571- SKU:
- M810571
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$18.96 -
MOOSE RACING Top End Gasket Kit - RM 250 810572
MOOSE RACING
$18.96A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or cost you a fortune. This Moose Racing kit delivers OEM-quality components at a fraction of the price, eliminating the guesswork when reassembling your...M810572- SKU:
- M810572
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$18.96Qty in Cart: 0Quantity:Price:$18.96Subtotal: -
MOOSE RACING Top End Gasket Kit - RM 250 810573
MOOSE RACING
$24.85A top-end rebuild demands precision and reliability—especially when you're putting in the labor yourself. This MOOSE RACING gasket kit eliminates the guesswork by including every seal, O-ring, and gasket you need to reassemble your RM 250 with confidence...M810573- SKU:
- M810573
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
$24.85 -
MOOSE RACING Top End Gasket Kit - RM 250 810574
MOOSE RACING
$29.14A complete top-end rebuild demands precision-matched gaskets and seals that won't compromise your engine's integrity or performance. This Moose Racing kit eliminates the guesswork by including every gasket, O-ring, and seal you need for a full top-end...M810574- SKU:
- M810574
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$29.14Qty in Cart: 0Quantity:Price:$29.14Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KDX200 811442
MOOSE RACING
$84.39A complete engine and transmission rebuild requires precision gaskets and seals that won't compromise your work. This Moose Racing kit delivers OEM-equivalent quality at a fraction of the cost, letting you rebuild with confidence and keep more money in...M811442- SKU:
- M811442
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- KIT
$84.39Qty in Cart: 0Quantity:Price:$84.39Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - KX250 811454
MOOSE RACING
$70.33A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—and OEM replacements often come with OEM pricing. The MOOSE RACING Motor Gasket Kit delivers genuine OEM-quality seals and gaskets at a...M811454- SKU:
- M811454
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$70.33 -
MOOSE RACING Motor Gasket Kit with Seal - KX250 811455
MOOSE RACING
$70.33A complete engine and transmission rebuild demands precision-fit gaskets and seals—and OEM pricing shouldn't force you to choose between quality and cost. This Moose Racing Motor Gasket Kit delivers genuine OEM-level seals at a fraction of dealership...M811455- SKU:
- M811455
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$70.33 -
MOOSE RACING Motor Gasket Kit with Seal - KX250 811457
MOOSE RACING
$89.83A complete engine and transmission rebuild demands precision-fit gaskets and seals—factory tolerances won't tolerate improvisation. MOOSE Racing delivers OEM-quality replacement seals at a fraction of genuine part costs, letting you rebuild with...M811457- SKU:
- M811457
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$89.83 -
MOOSE RACING Motor Gasket Kit with Seal - CR80 811205
MOOSE RACING
$70.33A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your performance or reliability. MOOSE RACING delivers OEM-quality components at a fraction of dealership pricing, so you can confidently reassemble your...M811205- SKU:
- M811205
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$70.33Qty in Cart: 0Quantity:Price:$70.33Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - CR80 811206
MOOSE RACING
$74.68A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't fail under load. This MOOSE RACING Motor Gasket Kit eliminates the guesswork of sourcing individual components—every gasket, oil seal, and valve seal you need...M811206- SKU:
- M811206
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$74.68
