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 Generator Mount Gasket C9321F
COMETIC
$4.20A failing generator mount gasket compromises engine sealing and can lead to coolant leaks, overheating, and premature component wear. The Cometic C9321F restores a proper seal at the generator mounting surface, ensuring reliable cooling system integrity...09344676- SKU:
- 09344676
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- THICKNESS IMPERIAL:
- 0,032'
- UNITS:
- 5 PACK
- TYPE:
- GENERATOR
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS METRIC:
- 0.81 MM
$4.20 -
COMETIC Clutch Cover Gasket - XL C9319-1
COMETIC
$7.95A failing clutch cover gasket means oil seepage, contamination, and potential mid-race failures. The COMETIC C9319-1 eliminates these risks with a reinforced aluminum-core AFM construction that holds torque and seals decisively, without the mess of...09344674- SKU:
- 09344674
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- MATERIAL:
- FIBER
- MODEL:
- HI-PERFORMANCE
- THICKNESS IMPERIAL:
- 0,031'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$7.95 -
COMETIC Oil Pump Cover Gasket C9382-010
COMETIC
$12.70A leaking oil pump cover gasket can compromise your engine's oil pressure and reliability on the track or street. The COMETIC C9382-010 delivers OEM-quality sealing performance with premium materials engineered to withstand high RPM operation and thermal...09341652- SKU:
- 09341652
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET
- UNITS:
- 12 PACK
- MATERIAL:
- RUBBER
- THICKNESS METRIC:
- 0.25 MM
- TYPE:
- OIL PUMP COVER
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
$12.70 -
COMETIC Cam Cover Gasket - .032" C9328F5-032
COMETIC
$26.60A leaking cam cover gasket compromises engine cleanliness and can lead to oil contamination of spark plug wells and ignition systems. COMETIC's .032" gasket delivers a reliable, factory-quality seal using advanced composite materials designed to...09341646- SKU:
- 09341646
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CAM COVER
$26.60 -
COMETIC Front Tappet Block Gasket C9298
COMETIC
$6.40A leaking front tappet block gasket compromises oil pressure, engine efficiency, and overall reliability—making this COMETIC replacement essential for any serious engine build or rebuild. OEM gaskets wear and fail; a quality aftermarket replacement like...09341645- SKU:
- 09341645
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- TYPE:
- TAPPET BLOCK
- MATERIAL:
- FIBER
- MOUNTING POSITION:
- FRONT
- THICKNESS METRIC:
- 0.51 MM
- UNITS:
- 10 PACK
- PRODUCT NAME:
- GASKET
$6.40 -
COMETIC Top Cover Gasket C9488F
COMETIC
$27.00A quality top end gasket kit is non-negotiable for any engine rebuild or refresh—poor sealing directly compromises ring seal, power output, and engine longevity. The COMETIC C9488F delivers the multi-layered steel construction and Viton rubber coating...09341382- SKU:
- 09341382
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- 10 PACK
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,032'
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- TRANSMISSION TOP COVER
- RIDING STYLE:
- STREET
$27.00 -
COMETIC Top Cover Gasket C9522F
COMETIC
$7.40A quality head gasket is the foundation of a reliable, high-output engine—and the COMETIC C9522F is engineered to keep yours sealed under extreme conditions. Whether you're running naturally aspirated or forced-induction power, this top cover gasket kit...09341378- SKU:
- 09341378
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- TRANSMISSION TOP COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
$7.40 -
COMETIC Trans End Cover Gasket C9515-032AFM
COMETIC
$29.70High-output 4-stroke engines demand gasket technology that can handle extreme combustion pressures without sacrificing reliability. The Cometic Trans End Cover Gasket C9515-032AFM uses multi-layered steel construction with Viton rubber coating to...09341375- SKU:
- 09341375
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- UNITS:
- 10 PACK
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- TRANSMISSION END COVER
$29.70 -
COMETIC Lower Rocker Box Rubber Gasket C9281
COMETIC
$23.20Rocker box gaskets endure extreme thermal cycles and high oil pressures—failures here mean catastrophic engine damage and costly downtime. The COMETIC C9281 delivers reliable sealing with a proven Viton compound that resists heat, oil degradation, and...09341349- SKU:
- 09341349
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER COVER
- PRODUCT NAME:
- GASKET
$23.20 -
COMETIC Inner Rocker Box Rubber Gasket C9283
COMETIC
$14.80Proper rocker box sealing is critical to preventing oil leakage and maintaining consistent hydraulic pressure in your valve train. The COMETIC C9283 Inner Rocker Box Rubber Gasket delivers reliable, long-lasting sealing with a proven Viton compound that...09341348- SKU:
- 09341348
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER
- MATERIAL:
- VITON
- MOUNTING POSITION:
- INNER
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
$14.80 -
COMETIC Complete Gasket Kit - FLT C9172
COMETIC
$287.65A complete gasket kit eliminates the guesswork of sourcing individual sealing components for your engine build or rebuild. Cometic's C9172 delivers OEM-quality or better materials for each gasket type, ensuring reliable sealing across all critical engine...09341220- SKU:
- 09341220
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- BORE SIZE:
- 3,750'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.750'
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
$287.65 -
COMETIC Rocker Box Gasket Kit - Screamin' Eagle C9167
COMETIC
$56.65Engine oil seepage around rocker boxes compromises performance and creates maintenance headaches. The COMETIC Rocker Box Gasket Kit C9167 is engineered with premium materials to eliminate leaks and deliver reliable, service-free operation on your...09341217- SKU:
- 09341217
- Availability:
- Ships Same Business Day
- Weight:
- 0.49 LBS
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- MATERIAL:
- STEEL
- MODEL:
- EST
- FEATURES:
- FOR SCREAMIN' EAGLE ROCKER BOXES
$56.65Qty in Cart: 0Quantity:Price:$56.65Subtotal: -
COMETIC Head Gasket - .060"- MLS Standard C9158
COMETIC
$90.25A worn or incorrect head gasket is one of the fastest ways to lose compression, leak coolant, and compromise engine reliability. The COMETIC C9158 .060" MLS gasket uses multi-layer steel construction with load-control embossments to distribute clamping...09341214- SKU:
- 09341214
- Availability:
- Ships Same Business Day
- Weight:
- 0.37 LBS
- BORE SIZE:
- 3,750'
- DISPLACEMENT:
- 96'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.750'
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
$90.25Qty in Cart: 0Quantity:Price:$90.25Subtotal: -
COMETIC Top End Gasket - Standard - XB C9856
COMETIC
$142.75A failing top end gasket will cost you far more than prevention—blown seals lead to compression loss, coolant leaks, and catastrophic engine damage. The COMETIC EST gasket kit delivers precision engineering with embossed stainless steel construction and...09340817- SKU:
- 09340817
- Availability:
- Ships Same Business Day
- Weight:
- 0.79 LBS
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,500'
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
$142.75Qty in Cart: 0Quantity:Price:$142.75Subtotal: -
COMETIC Base Gasket - 3-5/8" C9988
COMETIC
$33.55A head gasket failure can cost you an entire engine—and a race. The COMETIC Base Gasket C9988 uses Multi-Layer Steel (MLS) construction with Load Control Embossments to distribute clamping force evenly across the sealing surface, reducing bore distortion...09340783- SKU:
- 09340783
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.625'
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,51 MM (0,020')
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- TYPE:
- CYLINDER BASE
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
$33.55 -
COMETIC Base Gasket - XL 3-5/8" C9554
COMETIC
$33.55A head gasket failure can sideline your engine and drain your wallet fast. The COMETIC Base Gasket C9554 uses advanced MLS (Multi-Layer Steel) construction with Load Control Embossments to distribute clamping force evenly, minimizing bore distortion and...09340782- SKU:
- 09340782
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE IMPERIAL:
- 3.625'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.25 MM
- RIDING STYLE:
- STREET
- STYLE:
- BIG BORE
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
$33.55Qty in Cart: 0Quantity:Price:$33.55Subtotal: -
COMETIC Base Gasket - Standard C9987
COMETIC
$33.55A properly sealed combustion chamber is non-negotiable for consistent power delivery and engine longevity. The COMETIC Base Gasket C9987 uses multi-layer steel construction with load-control embossments to distribute clamping force evenly, reducing bore...09340781- SKU:
- 09340781
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- RUBBER
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.51 MM
$33.55 -
COMETIC Base Gasket - 4.125" - .020" C9739
COMETIC
$33.55A quality head gasket is the foundation of any reliable engine build—it's what keeps combustion sealed and cylinder pressures contained. The COMETIC Base Gasket delivers MLS (Multi-Layer Steel) construction with precision-engineered Load Control...09340779- SKU:
- 09340779
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.51 MM
$33.55 -
COMETIC Base Gasket - 4-1/8" Twin Cam - .010" C9938
COMETIC
$33.55A head gasket failure can cost you race time and engine damage. The COMETIC Base Gasket delivers reliable sealing across extreme load conditions, ensuring your Twin Cam engine maintains compression and power cycle after cycle. With MLS construction and...09340778- SKU:
- 09340778
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- THICKNESS METRIC:
- 0.25 MM
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- MATERIAL:
- STEEL
$33.55 -
COMETIC Base Gasket - 4" - .010" C9937
COMETIC
$33.55A head gasket failure can sideline your engine and drain your wallet. The COMETIC Base Gasket delivers reliable sealing across demanding racing conditions, high-boost applications, and variable surface finishes—keeping your combustion chamber sealed...09340777- SKU:
- 09340777
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.25 MM
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 4.000'
- STYLE:
- STANDARD
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- MATERIAL:
- STEEL
- TYPE:
- CYLINDER BASE
$33.55
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.
