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...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
$11.95Qty in Cart: 0Quantity:Price:$11.95Subtotal: -
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...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
$7.95 -
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...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...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
$7.95 -
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...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
$7.95 -
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...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...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
$11.95Qty in Cart: 0Quantity:Price:$11.95Subtotal: -
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...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...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...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
$39.95 -
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...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...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
$16.95 -
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...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...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...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...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,...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...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...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...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:
