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 Cylinder Head Gasket C10167-036
COMETIC
$61.90A quality cylinder head gasket is non-negotiable for reliable combustion sealing and long-term engine integrity. This Cometic gasket handles extreme temperatures, aggressive boost pressures, and varied surface finishes without sacrificing durability...09345925- SKU:
- 09345925
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE:
- 4,145'
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,036'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 4.145'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.91 MM
- UNITS:
- 2 PACK
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Primary Gasket Kit C9887
COMETIC
$101.80A quality primary gasket kit is the foundation of a leak-free, reliable engine seal. Cometic's AFM gaskets are engineered for extreme temperatures and high-clamping loads, eliminating the guesswork and rework that comes with inferior gasket materials...09340746- SKU:
- 09340746
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
$101.80 -
COMETIC Tappet Block Gasket - XL C9955
COMETIC
$13.95A failing tappet block gasket compromises oil sealing integrity and can lead to costly leaks that damage surrounding components. The COMETIC Tappet Block Gasket C9955 delivers reliable sealing performance with precision engineering and domestic...09340754- SKU:
- 09340754
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- STREET
- TYPE:
- TAPPET BLOCK
- MOUNTING POSITION:
- FRONT
- MOUNTING POSITION:
- REAR
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- PAIR
$13.95 -
COMETIC Primary Gasket Kit C9211
COMETIC
$56.65A primary gasket failure can sideline your engine and derail race day. Cometic's C9211 kit eliminates guesswork with purpose-built AFM gaskets engineered for high-heat, high-load environments where standard gaskets fail. If you're running a machined...09344807- SKU:
- 09344807
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
$56.65Qty in Cart: 0Quantity:Price:$56.65Subtotal: -
COMETIC Oil Pan Gasket - Twin Cam C9647F1
COMETIC
$13.95A quality oil pan gasket is critical to preventing leaks that can compromise engine lubrication and lead to catastrophic damage. The COMETIC C9647F1 uses a proven aluminum Foamette design that eliminates the need for gasket sealer, reducing installation...09344811- SKU:
- 09344811
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- UNITS:
- EACH
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- OIL PAN
$13.95Qty in Cart: 0Quantity:Price:$13.95Subtotal: -
COMETIC Point Cover Gasket - Big Twin C9306F
COMETIC
$8.90A worn or deteriorating derby cover gasket compromises the seal on your Big Twin engine, leading to oil seepage, contamination, and potential engine damage over time. Cometic's point cover gasket delivers a reliable OEM-quality seal that keeps internal...09341359- SKU:
- 09341359
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- POINT COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- UNITS:
- 5 PACK
$8.90Qty in Cart: 0Quantity:Price:$8.90Subtotal: -
COMETIC Head/Intake Seal - Big Twin C9299
COMETIC
$10.60A compromised head or intake seal will cost you power, reliability, and money. The COMETIC C9299 Head/Intake Seal eliminates guesswork with precision-engineered construction that maintains consistent torque retention across countless heat cycles, keeping...09341360- SKU:
- 09341360
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- THICKNESS:
- 0,79 MM (0,031')
- UNITS:
- 10 PACK
- THICKNESS IMPERIAL:
- 0,031'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- TYPE:
- INTAKE MANIFOLD
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
$10.60 -
COMETIC Oil Pump Cover Paper Gasket C9382
COMETIC
$6.40A failing oil pump cover gasket compromises your engine's oil seal integrity, risking pressure loss and potential damage to critical internal components. The COMETIC C9382 is a precision paper gasket engineered to restore a factory-tight seal, ensuring...09341363- SKU:
- 09341363
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- MATERIAL:
- VULCANIZED FIBER
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.25 MM
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
$6.40 -
COMETIC Starter Cover Gasket C9507F
COMETIC
$5.30A leaking starter cover gasket compromises engine sealing and can lead to oil weeping that attracts debris and contaminates critical engine components. The COMETIC C9507F delivers OEM-equivalent sealing performance with superior material durability,...09341368- SKU:
- 09341368
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- UNITS:
- 10 PACK
- TYPE:
- STARTER HOUSING
$5.30 -
COMETIC Starter Cover Gasket C9508F
COMETIC
$11.10A leaking starter cover gasket compromises engine sealing and invites oil contamination into critical starter components. The COMETIC C9508F delivers factory-grade reliability with precision manufacturing that eliminates guesswork during reassembly. This...09341369- SKU:
- 09341369
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- STARTER HOUSING
- UNITS:
- 10 PACK
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
$11.10 -
COMETIC Rocker Gasket Kit - M8 C10226
COMETIC
$77.65Rocker box gasket failure compromises engine sealing and can lead to oil leaks, contamination, and costly engine damage. The COMETIC Rocker Gasket Kit M8 C10226 delivers a complete seal solution with OEM-quality components designed specifically for...09346315- SKU:
- 09346315
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- TYPE:
- ROCKER COVER
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
$77.65Qty in Cart: 0Quantity:Price:$77.65Subtotal: -
COMETIC Head Gasket - .030" - Twin Cam C9725
COMETIC
$61.90A quality head gasket is the foundation of reliable cylinder sealing—especially on high-performance Twin Cam engines where boost and sustained RPMs demand precision. The COMETIC C9725 uses proven MLS (Multi-Layer Steel) construction with Load Control...09340002- SKU:
- 09340002
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE:
- 4,000'
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- THICKNESS:
- 0,76 MM (0,030')
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
$61.90 -
COMETIC Head Gasket - Standard - VROD - .030" C9896
COMETIC
$129.10A proper head gasket is fundamental to engine reliability—it's your first line of defense against combustion chamber leakage, coolant seepage, and compression loss. The COMETIC C9896 delivers proven MLS construction with precision-engineered Load Control...09340796- SKU:
- 09340796
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- MATERIAL:
- LAYERED STEEL
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- BORE SIZE:
- 4,017'
- MATERIAL:
- VITON
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- PRODUCT NAME:
- GASKET
- BORE SIZE IMPERIAL:
- 4.017'
- RIDING STYLE:
- STREET
$129.10Qty in Cart: 0Quantity:Price:$129.10Subtotal: -
COMETIC Motor Gasket Kit - 1550 C9892
COMETIC
$169.00A complete gasket failure can end your race day before it starts. The COMETIC Motor Gasket Kit C9892 delivers OEM-grade sealing across your entire engine, using purpose-built materials that handle both street and track conditions without compromise. When...09340808- SKU:
- 09340808
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
- BORE SIZE IMPERIAL:
- 3.875'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE:
- 3,875'
- MATERIAL:
- STEEL
- TYPE:
- MOTOR
- UNITS:
- KIT
$169.00 -
COMETIC Motor Gasket Kit - 4" C9940
COMETIC
$356.95A complete gasket failure can cost you a race and thousands in engine damage. The COMETIC Motor Gasket Kit C9940 delivers the reliability you need with premium materials engineered for sustained high-RPM performance and boost pressures. Whether you're...09340810- SKU:
- 09340810
- Availability:
- Ships Same Business Day
- Weight:
- 2.00 LBS
- TYPE:
- MOTOR
- UNITS:
- KIT
- BORE SIZE:
- 4,000'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- STEEL
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
$356.95Qty in Cart: 0Quantity:Price:$356.95Subtotal: -
COMETIC Primary Spacer Gasket C9942F5
COMETIC
$7.80Proper primary spacing is critical for Twin Cam engine reliability and shift quality. The COMETIC Primary Spacer Gasket C9942F5 maintains precise clearances between primary components, preventing wear and ensuring consistent clutch engagement across...09341405- SKU:
- 09341405
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- THICKNESS IMPERIAL:
- 0.060'
- THICKNESS:
- 1,52 MM (0,060')
- RIDING STYLE:
- STREET
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WASHER
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- PRIMARY SPACER
- UNITS:
- 5 PACK
$7.80 -
COMETIC Cam Cover Gasket - Big Twin C9328F5
COMETIC
$26.60A failing cam cover gasket compromises engine sealing and creates oil leaks that compromise both performance and engine longevity. The COMETIC C9328F5 is engineered specifically for Big Twin applications, delivering reliable sealing with premium...20111498- SKU:
- 20111498
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- THICKNESS:
- 1,52 MM (0,060')
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- TYPE:
- CAM COVER
$26.60 -
COMETIC Top End Gasket Kit - Buell C10115
COMETIC
$142.75A failed top-end gasket can sideline your engine and compromise reliability when you can't afford downtime. The COMETIC C10115 kit eliminates weak points in your seal integrity with Extreme Sealing Technology (EST)—engineered gaskets that actively manage...09344736- SKU:
- 09344736
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE:
- 3,57'
- BORE SIZE IMPERIAL:
- 3.57'
- MATERIAL:
- ALUMINUM
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
$142.75Qty in Cart: 0Quantity:Price:$142.75Subtotal: -
COMETIC Complete Gasket Kit - Big Twin C10119
COMETIC
$159.55A complete gasket failure can sideline your Big Twin engine at the worst possible moment—whether you're on the track or the street. The COMETIC C10119 kit eliminates guesswork by providing every gasket you need for a comprehensive rebuild using premium...09344738- SKU:
- 09344738
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE SIZE IMPERIAL:
- 3.8125'
- RIDING STYLE:
- STREET
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- BORE SIZE:
- 3,8125'
- TYPE:
- MOTOR
- UNITS:
- KIT
$159.55Qty in Cart: 0Quantity:Price:$159.55Subtotal: -
COMETIC Rocker Cover Gaskets - .043" C10008
COMETIC
$30.40Rocker cover gaskets are a critical seal in your engine's valve train—any deterioration leads to oil seepage, contamination of spark plugs, and potential performance loss. COMETIC's .043" gaskets use a stainless steel core with dual-sided Viton rubber...09344646- SKU:
- 09344646
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- THICKNESS METRIC:
- 1.09 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,09 MM (0,043')
- UNITS:
- PAIR
- MATERIAL:
- GALVANIZED STEEL
- THICKNESS IMPERIAL:
- 0,043'
- TYPE:
- ROCKER COVER
$30.40
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.
