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
-
COMETIC Stator Gasket - Honda EC1545032AFM
COMETIC
$11.95OEM stator cover gaskets fail prematurely because they stick to engine cases, requiring destructive removal and costly downtime. The COMETIC Stator Gasket eliminates this problem with AFM material—a chemically blown nitrile-aluminum composite that...09344395- SKU:
- 09344395
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STATOR COVER
- MODEL:
- HI-PERFORMANCE
- THICKNESS IMPERIAL:
- 0,032'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- EACH
$11.95 -
COMETIC Stator Gasket - Yamaha EC1942032AFM
COMETIC
$7.95A stator cover gasket failure means oil seepage, repeated teardowns, and lost track time. The COMETIC Stator Gasket eliminates the frustration of stuck gaskets and unreliable seals by combining an aluminum-reinforced core with AFM synthetic rubber—a...09344408- SKU:
- 09344408
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STATOR COVER
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- MODEL:
- HI-PERFORMANCE
$7.95Qty in Cart: 0Quantity:Price:$7.95Subtotal: -
COMETIC Clutch Gasket - Yamaha EC470020F
COMETIC
$9.95A worn or failing clutch cover gasket leads to oil weeping, potential case damage, and costly downtime. The COMETIC Clutch Gasket eliminates these headaches with a dual-layer AFM construction that seals reliably without sealants, reduces service time,...09344462- SKU:
- 09344462
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- MODEL:
- HI-PERFORMANCE
$9.95 -
COMETIC Exhaust Gasket EX361
COMETIC
$7.95A failed exhaust gasket doesn't just leak—it compromises your engine's sealing integrity and can lead to costly damage under high-heat conditions. The COMETIC Exhaust Gasket EX361 is engineered with dual-layer construction to handle extreme temperatures...09344534- SKU:
- 09344534
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 101.00 MM
- TYPE:
- EXHAUST
- UNITS:
- SET
$7.95Qty in Cart: 0Quantity:Price:$7.95Subtotal: -
COMETIC Exhaust Gasket EX456010S
COMETIC
$7.95Exhaust gasket failure is one of the quickest ways to compromise engine sealing and lose performance gains—especially under high heat and boost conditions. The COMETIC EX456010S delivers the thermal stability and structural integrity you need to keep...09344538- SKU:
- 09344538
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
- BORE SIZE METRIC:
- 68.50 MM
- MODEL:
- HI-PERFORMANCE
- TYPE:
- EXHAUST
- PRODUCT NAME:
- GASKET
$7.95Qty in Cart: 0Quantity:Price:$7.95Subtotal: -
COMETIC Exhaust Gasket - Yamaha EX641
COMETIC
$13.95Exhaust gasket failure is one of the most common causes of performance loss and costly engine damage. The COMETIC EX641 eliminates guesswork with precision engineering designed to handle extreme combustion temperatures while resisting blow-outs from...09344541- SKU:
- 09344541
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 100.00 MM
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- HI-PERFORMANCE
- TYPE:
- EXHAUST
- PRODUCT NAME:
- GASKET
$13.95 -
COMETIC Exhaust Gasket EX657
COMETIC
$11.95Exhaust gasket failure leads to costly leaks, lost horsepower, and potential engine damage—especially under high-heat or high-boost conditions. The COMETIC EX657 is engineered to seal reliably across extreme temperature ranges, eliminating the risk of...09344545- SKU:
- 09344545
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- ATV
- TYPE:
- EXHAUST
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- BORE SIZE METRIC:
- 99.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
$11.95 -
COMETIC Exhaust Gasket - Honda EX690064AM
COMETIC
$4.95Exhaust gasket failure leads to power loss, heat damage, and costly engine complications. The COMETIC EX690064AM delivers reliable, high-temperature sealing that won't fail under extreme conditions or aggressive tuning. Built with domestic precision and...09344546- SKU:
- 09344546
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- BORE SIZE METRIC:
- 39.00 MM
- RIDING STYLE:
- ATV
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.63 MM
- TYPE:
- EXHAUST
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- THICKNESS IMPERIAL:
- 0,064'
$4.95 -
COMETIC Exhaust Gasket EX817
COMETIC
$13.95Exhaust gasket failure means boost leaks, power loss, and costly engine damage—especially under high heat and pressure. The COMETIC EX817 is engineered for extreme conditions with a dual-layer construction that seals reliably across 4-stroke...09344554- SKU:
- 09344554
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- EXHAUST
- UNITS:
- SET
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- BORE SIZE METRIC:
- 90.00 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
$13.95 -
COMETIC Valve Cover Gasket - Honda VC032010S
COMETIC
$39.95A failing valve cover gasket will bleed oil onto your engine bay and compromise your engine's cleanliness—exactly what you don't want during a race or on the street. The COMETIC VC032010S delivers OEM-quality sealing at a fraction of the cost, using...09344566- SKU:
- 09344566
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE COVER
- MODEL:
- HI-PERFORMANCE
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$39.95Qty in Cart: 0Quantity:Price:$39.95Subtotal: -
COMETIC Bottom End Gasket Set - Gas Gas C3310
COMETIC
$64.95A complete bottom end gasket set is essential when you're doing a full engine rebuild—it ensures all sealing surfaces are fresh and properly engineered for your Gas Gas C3310, eliminating the risk of oil leaks and coolant weeping that can compromise...09344140- SKU:
- 09344140
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- HI-PERFORMANCE
- UNITS:
- KIT
$64.95Qty in Cart: 0Quantity:Price:$64.95Subtotal: -
COMETIC Stator Gasket - Kawasaki EC1339032AFM
COMETIC
$16.95Stator cover gasket failures are costly downtime culprits—they weep, crawl, and demand tedious scraping during replacement. The COMETIC Stator Gasket eliminates these headaches with its AFM composite construction, delivering a reliable seal without...09344392- SKU:
- 09344392
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- TYPE:
- STATOR COVER
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- UNITS:
- EACH
$16.95Qty in Cart: 0Quantity:Price:$16.95Subtotal: -
MOOSE RACING Motor Gasket Kit with Seal - YZ125 811639
MOOSE RACING
$56.72A complete engine and transmission rebuild demands precision-fit gaskets and seals—factory tolerances won't accept substitutes. The MOOSE RACING Motor Gasket Kit delivers OEM-quality replacement seals at a fraction of genuine part costs, letting you...M811639- SKU:
- M811639
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
$56.72 -
MOOSE RACING Motor Gasket Kit with Seal - CR500 811272
MOOSE RACING
$98.45A complete engine and transmission rebuild requires precision-fit gaskets and seals—factory OEM quality at a fraction of the cost. This Moose Racing kit eliminates the tedious sourcing of individual components, giving you confidence that every gasket and...09340102- SKU:
- 09340102
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- COMPLETE
$98.45 -
BOYESEN Replacement Gasket - KTM CCG-41
BOYESEN
$7.00Factory clutch covers are prone to warping under sustained racing conditions, compromising your seal integrity and risking fluid leakage at critical moments. The BOYESEN CCG-41 replaces OEM gaskets with individually surfaced, asbestos-free construction...09343124- SKU:
- 09343124
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- NITRILE RUBBER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- MODEL:
- FACTORY RACING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$7.00Qty in Cart: 0Quantity:Price:$7.00Subtotal: -
BOYESEN Replacement Gasket CCG-42
BOYESEN
$7.00A clutch cover gasket is critical to preventing oil seepage and maintaining consistent engine temperatures during high-demand racing conditions. The BOYESEN CCG-42 eliminates the leak-prone factory gasket with a precision-surfaced, asbestos-free design...09341291- SKU:
- 09341291
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MODEL:
- FACTORY RACING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- MATERIAL:
- NITRILE RUBBER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$7.00Qty in Cart: 0Quantity:Price:$7.00Subtotal: -
BOYESEN Replacement Gasket SCG-42
BOYESEN
$5.95Engine covers take a beating from dirt, moisture, and temperature swings—stock gaskets degrade quickly and compromise your seal integrity. The BOYESEN SCG-42 replacement gasket delivers a reliable, long-lasting seal using premium materials and design...09341290- SKU:
- 09341290
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER GASKET
- MATERIAL:
- NITRILE RUBBER
- MODEL:
- FACTORY RACING
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$5.95Qty in Cart: 0Quantity:Price:$5.95Subtotal: -
BOYESEN Ignition Cover Gasket SCG-41
BOYESEN
$5.95A degraded ignition cover gasket compromises engine sealing, allowing moisture and contaminants to infiltrate critical internal components. The Boyesen SCG-41 delivers a factory-quality seal with materials and construction that outlast OEM gaskets,...09341285- SKU:
- 09341285
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MODEL:
- FACTORY RACING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER GASKET
- MATERIAL:
- NITRILE RUBBER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$5.95 -
BOYESEN Replacement Gasket - KTM CCG-46
BOYESEN
$7.00A worn or damaged clutch cover gasket compromises your engine's seal integrity, leading to oil leaks and potential performance loss during high-RPM running. The BOYESEN CCG-46 replacement gasket delivers a factory-grade, leak-free fit with materials...09341283- SKU:
- 09341283
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- NITRILE RUBBER
- MODEL:
- FACTORY RACING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$7.00 -
BOYESEN Replacement Gasket CCG-27
BOYESEN
$7.00Factory clutch cover gaskets wear out and degrade under heat and pressure, leading to oil seepage and potential engine damage. The BOYESEN CCG-27 replacement gasket eliminates leaks with a precision-surfaced design and asbestos-free construction,...09341272- SKU:
- 09341272
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- NITRILE RUBBER
- MODEL:
- FACTORY RACING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$7.00Qty in Cart: 0Quantity:Price:$7.00Subtotal:
