Harley Engine Gaskets and Kits
Harley Bike Gaskets & Kits at JJ Motorsports
Rebuild your Harley with premium gasket kits and seals from JJ Motorsports, featuring complete top-end, motor, and cam-install kits for leak-free performance on Milwaukee-Eight, Twin Cam, Evo, and Big Twin engines. These high-quality MLS, rubber, and metal gaskets ensure perfect sealing and long-term reliability.
Shop Feuling, Cometic, and James Gasket for proven sealing solutions. Explore related categories such as Harley engine for cams and lifters, or Harley for oil pumps and heads to complete your rebuild.
Top Harley Gaskets & Kits
- Feuling Top-End Cam Install Kit M8 2030 – Complete top-end gasket kit for Milwaukee-Eight; includes head, base, rocker, and pushrod seals.
- Cometic Complete Gasket Kit C9748F – Full engine gasket set with MLS head gaskets; fits Twin Cam 88/96/103 engines.
- James Gasket Motor Gasket Metal Base Rocker 17041-92-A – Metal rocker box base gasket set; OEM-style for Evo and Twin Cam rocker boxes.
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 Head Gasket - 4.000" x .040" C10084-040
COMETIC
$59.80A head gasket failure can sideline your engine and drain your wallet. The COMETIC C10084-040 uses multi-layer steel construction with load control embossments to maintain consistent clamping force across the entire sealing surface, reducing bore...09343148- SKU:
- 09343148
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 4,000'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- MATERIAL:
- VITON
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$59.80 -
COMETIC Head Gasket - 4.125" x .030" C10086-030
COMETIC
$59.80A proper head gasket is the foundation of any reliable engine build—it seals combustion pressure, coolant, and oil passages under extreme thermal and mechanical stress. COMETIC's MLS design uses load control embossments to distribute clamping force...09343151- SKU:
- 09343151
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- VITON
- THICKNESS:
- 0,76 MM (0,030')
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE:
- 4,125'
- TYPE:
- CYLINDER HEAD
$59.80 -
COMETIC Head Gasket - 4.250" x .040" C10088-040
COMETIC
$59.80A quality head gasket is the seal that keeps combustion pressure contained and oil/coolant separate—and compromising on this critical component invites catastrophic engine failure. The COMETIC C10088-040 uses MLS (Multi-Layer Steel) construction with...09343156- SKU:
- 09343156
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- BORE SIZE:
- 4,250'
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 4.250'
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS IMPERIAL:
- 0,040'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
- TYPE:
- CYLINDER HEAD
$59.80Qty in Cart: 0Quantity:Price:$59.80Subtotal: -
COMETIC Upper Rocker Box Rubber Gasket C9277
COMETIC
$23.20A leaking rocker box gasket compromises oil containment and can accelerate wear on critical valve train components. The COMETIC Upper Rocker Box Rubber Gasket C9277 delivers reliable sealing with Viton's superior resistance to heat and oil...09341346- SKU:
- 09341346
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- TYPE:
- ROCKER COVER
- MOUNTING POSITION:
- UPPER
- RIDING STYLE:
- STREET
$23.20 -
COMETIC Upper Rocker Box Rubber Gasket C9278
COMETIC
$23.20A properly sealed rocker box is fundamental to maintaining oil pressure and preventing leakage that compromises engine performance. The COMETIC Upper Rocker Box Rubber Gasket C9278 delivers reliable sealing with a dual-layer Viton construction designed...09341347- SKU:
- 09341347
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- UPPER
- TYPE:
- ROCKER COVER
$23.20 -
COMETIC Lower Rocker Box Rubber Gasket C9282
COMETIC
$23.20A reliable rocker box gasket is critical to maintaining proper oil containment and preventing leaks that compromise engine performance and longevity. The COMETIC C9282 delivers precision sealing with a dual-layer Viton construction that resists oil...09341350- SKU:
- 09341350
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- LOWER
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER
$23.20 -
COMETIC Head Gasket -.04" - Evo - 3.75" C9695
COMETIC
$61.90A head gasket failure can sideline your Evo and cost thousands in engine damage. The COMETIC C9695 uses multi-layer steel construction with load control embossments to distribute clamping force evenly, reducing bore distortion and maximizing ring seal...09341354- SKU:
- 09341354
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- THICKNESS:
- 1,02 MM (0,040')
- BORE SIZE:
- 3,750'
- BORE SIZE IMPERIAL:
- 3.750'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Head Gasket - .03" - 3 13/16" C9692
COMETIC
$61.90A head gasket failure can compromise your engine's integrity and leave you stranded. The COMETIC C9692 uses multi-layer steel construction with load control embossments to maintain consistent sealing pressure across your combustion chamber, reducing bore...09341355- SKU:
- 09341355
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.8125'
- PRODUCT NAME:
- GASKET
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE:
- 3,8125'
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
$61.90 -
COMETIC Cam Service Gasket Kit C9623F
COMETIC
$26.20A cam change demands precision—and using OEM-spec gaskets, seals, and O-rings is non-negotiable if you want to avoid oil leaks and timing inconsistencies down the line. The COMETIC Cam Service Gasket Kit C9623F gives you every sealing component you need...09341357- SKU:
- 09341357
- Availability:
- Ships Same Business Day
- Weight:
- 0.37 LBS
- TYPE:
- CAM CHANGE
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
$26.20 -
COMETIC Starter Motor Mount Gasket C9330F
COMETIC
$6.40A leaking starter motor mount gasket compromises engine sealing and can lead to oil weepage and potential starter issues. COMETIC's C9330F gasket delivers reliable sealing with precision engineering, ensuring your starter assembly remains leak-free and...09341371- SKU:
- 09341371
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 10 PACK
- THICKNESS:
- 1,52 MM (0,060')
- RIDING STYLE:
- STREET
- TYPE:
- STARTER HOUSING
- THICKNESS METRIC:
- 1.52 MM
$6.40 -
COMETIC Output Gear Seal C9200
COMETIC
$53.70Transmission output seals are critical wear items that prevent fluid loss and contamination in your Twin Cam drivetrain. A failed seal compromises lubrication, accelerates internal wear, and can sideline your bike or race machine at the worst possible...09341392- SKU:
- 09341392
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- TYPE:
- OUTPUT GEAR
- UNITS:
- 10 PACK
$53.70 -
COMETIC Oil Pan Gasket - Twin Cam C9646F1
COMETIC
$13.60A failing oil pan gasket will cost you far more in engine damage than the price of prevention. This COMETIC gasket eliminates weeping leaks and maintains consistent oil pressure without requiring additional sealers, giving you one less variable to manage...09344810- SKU:
- 09344810
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- UNITS:
- EACH
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- OIL PAN
- RIDING STYLE:
- STREET
$13.60Qty in Cart: 0Quantity:Price:$13.60Subtotal: -
COMETIC Cam Cover Gasket - Twin Cam C9575F5
COMETIC
$43.40Cam cover gaskets are a critical seal that prevents oil leakage and contamination from reaching your engine's most precision-critical components. A failing gasket forces oil past the cam cover, leading to external leaks, potential internal damage, and...20111500- SKU:
- 20111500
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- UNITS:
- 5 PACK
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- CAM COVER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
$43.40 -
COMETIC Top End Gasket Kit - Big Bore - Big Twin - EST C9766
COMETIC
$142.75A top-end rebuild demands gasket integrity that matches your engine's demands—and thermal stress is the silent killer that takes down inferior seals. The COMETIC EST C9766 Gasket Kit solves this with embossed stainless steel construction and proprietary...DS172078- SKU:
- DS172078
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- BORE SIZE:
- 3,625'
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.625'
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- RUBBER
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
$142.75 -
COMETIC Top End Gasket Kit - 883 C9192
COMETIC
$229.90A top-end gasket failure can sideline your engine at the worst possible moment—and replacing individual gaskets is a false economy. The COMETIC C9192 kit eliminates guesswork by bundling all necessary seals in one complete package, engineered to handle...09344803- SKU:
- 09344803
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE IMPERIAL:
- 3.000'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE:
- 3,000'
- DISPLACEMENT:
- 883 CC
- MATERIAL:
- RUBBER
- TYPE:
- TOP END
- UNITS:
- KIT
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
$229.90 -
COMETIC Transmission/Engine Gasket - FL C9190
COMETIC
$25.15Transmission and engine gasket integrity directly impacts your engine's reliability and performance—a failed gasket means oil leakage, potential overheating, and costly downtime. The COMETIC C9190 delivers the seal quality you need for long-term...09341235- SKU:
- 09341235
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
$25.15Qty in Cart: 0Quantity:Price:$25.15Subtotal: -
COMETIC Outer Rocker Gasket C9208
COMETIC
$22.00Rocker cover gasket failure leads to oil seepage, contaminated spark plug wells, and potential engine damage—problems that compound quickly in high-performance applications. The COMETIC Outer Rocker Gasket C9208 uses a stainless steel core with precision...09341398- SKU:
- 09341398
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- VITON
- MOUNTING POSITION:
- OUTER
- TYPE:
- ROCKER COVER
- UNITS:
- PAIR
- PRODUCT NAME:
- GASKET
- MOUNTING POSITION:
- UPPER
- RIDING STYLE:
- STREET
$22.00 -
COMETIC Head Gasket - .040" - 95" - Twin Cam C9722
COMETIC
$61.90A properly sealed combustion chamber is non-negotiable for consistent power output and engine longevity. The COMETIC C9722 head gasket uses multi-layer steel construction with load control embossments to maintain even pressure distribution across the...DS172105- SKU:
- DS172105
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$61.90 -
COMETIC Base Gasket - +4.125" - .010" C9935
COMETIC
$33.55A quality base gasket is critical to maintaining pressure integrity and preventing fuel leakage in your engine's fuel system. The COMETIC C9935 combines a stainless steel core with Viton rubber sealing surfaces, delivering the durability and fuel...09340035- SKU:
- 09340035
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE:
- 4,125'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 4.125'
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.25 MM
$33.55 -
COMETIC Trans Gasket Kit - M8 C10249
COMETIC
$130.15Transmission gasket failure can leave you stranded and cost thousands in rebuild expenses. The COMETIC Trans Gasket Kit M8 C10249 eliminates guesswork by providing factory-engineered sealing solutions specific to your application—no hunting for...09346334- SKU:
- 09346334
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- TYPE:
- TRANSMISSION
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$130.15Qty in Cart: 0Quantity:Price:$130.15Subtotal:
Buying Guide and FAQs
Buying Guide: Factors to Consider When Choosing Harley Bike Engine Gaskets and Kits
- Compatibility: Ensure the kit fits your Harley's engine type (e.g., Milwaukee-Eight M8, Twin Cam 88/96/103, Evo, Big Twin) and model (e.g., FLHR Road King 1984-1998, FLST Heritage Softail 2006). Use the vehicle selector for year-specific matches, including bore sizes and applications to avoid sealing issues.
- Type of Use: For cam changes or top-end rebuilds, select install kits with ARP bolts; complete gasket sets suit full engine overhauls for leak-free performance in touring or street riding.
- Components and Upgrades: Choose kits with MLS head gaskets, Viton seals, AFM exhaust gaskets, ARP hardware, and O-rings. Focus on high-tech materials for heat dissipation, corrosion resistance, and reliable sealing.
- Brand and Quality: Opt for Feuling for cam install kits with Koyo bearings, Cometic for EST gasket sets with embossed steel, James Gasket for rocker/base gaskets, Vance & Hines for exhaust ports, or Drag Specialties for transmission boards. Prioritize USA-made quality for durability in extreme conditions.
- Installation and Cost: Kits are designed for DIY or professional rebuilds with included components like moly paste and Loctite. Prices range from $16.95 for exhaust gaskets to $356.95 for complete sets—factor in bore sizes and free shipping over $99 for value.
Frequently Asked Questions (FAQs)
- What Harley models and engines do these gaskets and kits support? Kits support Big Twin, Twin Cam, Evo, M8, and models like Road King, Heritage Softail—use the year/make/model filter for compatibility, including bore sizes like 3.500" to 3.8125".
- How do high-tech materials improve sealing? Materials like MLS steel, Viton-coated, and AFM provide even heat dissipation, corrosion resistance, and leak-free performance for rebuilds.
- What is typically included in a cam install kit? Feuling kits include seals, bearings, ARP bolts, moly paste, Loctite, washers, and copper gaskets for complete cam changes.
- Are these kits suitable for top-end rebuilds? Yes, Cometic and James Gasket kits focus on top-end with head/base/rocker gaskets for reliable overhauls.
- What if a kit doesn't fit my Harley? Verify engine type, bore size, and model before buying. Our returns policy allows exchanges or refunds if it doesn't match.
- Can I find related engine parts? Yes—explore pistons/rings, cylinders/heads, bearings/seals, or full rebuild kits in the Harley engine category to complete your gasket upgrade.
