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 Rocker Cover Gasket - Big Twin C10008-10
COMETIC
$84.10A leaking rocker cover gasket doesn't just waste oil—it compromises engine cleanliness and can lead to costly damage if ignored. The COMETIC Rocker Cover Gasket delivers a reliable seal that outlasts inferior alternatives, keeping your Big Twin engine...09344647- SKU:
- 09344647
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- THICKNESS IMPERIAL:
- 0,043'
- UNITS:
- 10 PACK
- MATERIAL:
- GALVANIZED STEEL
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 1,09 MM (0,043')
- TYPE:
- ROCKER COVER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.09 MM
$84.10 -
COMETIC Primary Gasket C9145F5
COMETIC
$120.50A primary gasket is critical to maintaining a sealed, leak-free engine assembly—especially in high-performance applications where internal pressures exceed stock tolerances. COMETIC's C9145F5 delivers the durability and precision fit needed to prevent...09341341- SKU:
- 09341341
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- THICKNESS:
- 1,52 MM (0,060')
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- PRIMARY
- UNITS:
- 5 PACK
$120.50 -
COMETIC Chain Cover Gasket - XL C9957
COMETIC
$18.40A properly sealed chain cover is critical to preventing oil seepage and maintaining engine cleanliness in high-performance applications. The COMETIC C9957 Chain Cover Gasket uses Aluminum Foamette construction—a proven material that eliminates the need...09340787- SKU:
- 09340787
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- INSPECTION COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
$18.40Qty in Cart: 0Quantity:Price:$18.40Subtotal: -
COMETIC Top End Gasket - Standard - .030" C9850
COMETIC
$142.75A quality top-end gasket kit is non-negotiable for reliable engine performance, and the COMETIC C9850 delivers the sealing integrity your rebuild demands. The EST (Extreme Sealing Technology) design actively manages combustion heat to eliminate hot spots...09340819- SKU:
- 09340819
- Availability:
- Ships Same Business Day
- Weight:
- 0.79 LBS
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- RUBBER
- MATERIAL:
- STAINLESS STEEL
- THICKNESS IMPERIAL:
- 0,030'
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
$142.75 -
JAMES GASKET Chain Gasket 60540-36-K
JAMES GASKET
$42.95A properly sealed engine depends on gaskets that can withstand sustained pressure cycles and temperature fluctuations without degradation. The JAMES GASKET Chain Gasket 60540-36-K meets or exceeds OEM specifications, ensuring reliable sealing performance...DS174968- SKU:
- DS174968
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- MATERIAL:
- SILICONE
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- FEATURES:
- BEADED
- TYPE:
- PRIMARY COVER
- UNITS:
- KIT
$42.95 -
JAMES GASKET Lower Cover Gasket Cork - Big Twin 17355-84
JAMES GASKET
$18.60A quality lower cover gasket is the foundation of a reliable, leak-free engine seal on your Big Twin. JAMES Gasket's cork construction with elastomer beading eliminates seepage at the crankcase, while the conformal silicone coating accommodates minor...DS174917- SKU:
- DS174917
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- MATERIAL:
- CORK
- MOUNTING POSITION:
- LOWER
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER BOX
$18.60Qty in Cart: 0Quantity:Price:$18.60Subtotal: -
JAMES GASKET Thick Fuel Cap Gasket 61111-77
JAMES GASKET
$16.50A fuel cap gasket is a critical seal that prevents fuel vapors from escaping your tank while protecting against contamination and fuel system pressure loss. A degraded or worn gasket compromises both performance and safety—leading to rough idle, check...DS174516- SKU:
- DS174516
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- STREET
- STYLE:
- THICK
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- TYPE:
- FUEL CAP
$16.50 -
JAMES GASKET Intake Manifold Gasket - Big Twin 27411-40
JAMES GASKET
$13.80A leaking intake manifold gasket compromises engine efficiency, increases emissions, and can lead to costly internal damage if left unchecked. The JAMES GASKET Intake Manifold Gasket kit provides a reliable, OEM-quality seal for Big Twin engines,...DS174490- SKU:
- DS174490
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- INTAKE MANIFOLD
- UNITS:
- 10 PACK
$13.80 -
JAMES GASKET Upper Rocker Cover - XL 17354-86-A
JAMES GASKET
$42.80A properly sealed rocker cover is critical to preventing oil leakage and maintaining crankcase ventilation—two factors that directly impact engine reliability and longevity. The JAMES GASKET Upper Rocker Cover eliminates the frustration of recurring...DS174358- SKU:
- DS174358
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- 5 PACK
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER BOX
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- UPPER
$42.80Qty in Cart: 0Quantity:Price:$42.80Subtotal: -
JAMES GASKET Bendix Gasket Kit BENDIX
JAMES GASKET
$12.95If you're running Bendix carburetors on your race engine or classic build, worn gaskets will compromise fuel atomization and create vacuum leaks that kill performance. This OEM-spec gasket kit restores proper sealing between carburetor stages, ensuring...DS173528- SKU:
- DS173528
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- GRAPHITE
- RIDING STYLE:
- STREET
- TYPE:
- CARBURETOR
- UNITS:
- KIT
$12.95 -
JAMES GASKET Oil Pump Cover Gasket 26276-80-M
JAMES GASKET
$6.90An oil pump cover gasket is a critical seal that prevents oil seepage at one of your engine's most vital lubrication points. Without proper sealing, you risk oil loss, reduced engine protection, and potential internal damage during high-performance...DS173464- SKU:
- DS173464
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- MYLAR
- STYLE:
- COVER
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
$6.90Qty in Cart: 0Quantity:Price:$6.90Subtotal: -
COMETIC Rocker Gasket - EST - XL C9765
COMETIC
$65.05Rocker box gasket failure leads to oil leaks, contamination, and potential engine damage—problems that compound quickly in high-performance applications. The COMETIC Rocker Gasket - EST - XL C9765 eliminates these risks with premium sealing materials...DS172077- SKU:
- DS172077
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- MODEL:
- EST
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$65.05Qty in Cart: 0Quantity:Price:$65.05Subtotal: -
COMETIC Top End Gasket Kit - XL1200 - EST C9762
COMETIC
$142.75Top-end gasket failures can sideline your engine and compromise performance—especially in high-heat applications where standard gaskets can't handle the demands. The COMETIC EST C9762 kit eliminates hot spots and uneven heat distribution with embossed...DS172074- SKU:
- DS172074
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 3.500'
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- BORE SIZE:
- 3,500'
- DISPLACEMENT:
- 1200 CC
- MATERIAL:
- RUBBER
- MATERIAL:
- STAINLESS STEEL
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$142.75Qty in Cart: 0Quantity:Price:$142.75Subtotal: -
COMETIC Rocker Gasket - EST - Big Twin C9752
COMETIC
$65.05Rocker box gasket failures lead to oil seepage, loss of compression integrity, and costly engine downtime. The COMETIC Rocker Gasket kit eliminates guesswork by bundling all necessary seals and O-rings for a complete, professional rocker box service on...DS172064- SKU:
- DS172064
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- MODEL:
- EST
- TYPE:
- ROCKER BOX
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$65.05Qty in Cart: 0Quantity:Price:$65.05Subtotal: -
COMETIC Copper Base Gasket - Big Twin C9029
COMETIC
$28.30A cylinder base gasket is your first line of defense against compression loss and oil seepage—two issues that degrade engine performance and reliability. The Cometic Copper Base Gasket C9029 delivers superior sealing on Big Twin applications through...DS172055- SKU:
- DS172055
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- COPPER
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- STANDARD
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,41 MM (0,016')
- THICKNESS IMPERIAL:
- 0.016'
- UNITS:
- PAIR
- TYPE:
- CYLINDER BASE
- THICKNESS METRIC:
- 0.41 MM
$28.30 -
COMETIC Tappet Cover Gasket - Twin Cam C9578
COMETIC
$5.40A leaking tappet cover gasket compromises engine bay cleanliness and can lead to oil seepage onto critical components. The COMETIC Tappet Cover Gasket C9578 is engineered for Twin Cam applications, delivering a reliable seal that prevents oil loss and...DS172047- SKU:
- DS172047
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MOUNTING POSITION:
- FRONT
- MOUNTING POSITION:
- REAR
- THICKNESS METRIC:
- 0.51 MM
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,51 MM (0,020')
- RIDING STYLE:
- STREET
- TYPE:
- TAPPET BLOCK
- MATERIAL:
- FIBER
- THICKNESS IMPERIAL:
- 0,020'
- UNITS:
- 10 PACK
$5.40 -
COMETIC Rocker Cover Gasket - .020" - Twin Cam C9577
COMETIC
$62.70A worn rocker cover gasket is an easy source of oil leaks that compromise engine cleanliness and can lead to costly damage if left unaddressed. The COMETIC C9577 delivers reliable sealing with a stainless steel core and Viton rubber construction,...DS172031- SKU:
- DS172031
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- TYPE:
- ROCKER COVER
- MATERIAL:
- VITON
- UNITS:
- 10 PACK
$62.70 -
COMETIC Kiehin Manifold C9425
COMETIC
$5.30The COMETIC Kiehin Manifold C9425 delivers precise intake routing and optimized fuel-air mixture distribution for engines demanding reliable, repeatable performance. Whether you're building a competition engine or upgrading a street machine, this...09350222- SKU:
- 09350222
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- FIBER
- PRODUCT NAME:
- GASKET
- TYPE:
- INTAKE MANIFOLD
- UNITS:
- 10 PACK
- THICKNESS IMPERIAL:
- 0.031'
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,031'
$5.30Qty in Cart: 0Quantity:Price:$5.30Subtotal: -
COMETIC Bendix Manifold Gasket C9417
COMETIC
$4.90A quality manifold gasket is the seal between your intake manifold and cylinder head—get this wrong, and you're looking at vacuum leaks, rough idle, and lost performance. The COMETIC Bendix C9417 delivers a reliable, OEM-equivalent seal that won't...09350221- SKU:
- 09350221
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- FIBER
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.020'
- TYPE:
- INTAKE MANIFOLD
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.51 MM
- THICKNESS:
- 0,51 MM (0,020')
$4.90Qty in Cart: 0Quantity:Price:$4.90Subtotal: -
COMETIC Oil Pan Gasket - AFM C9265F
COMETIC
$36.70An oil pan gasket is a critical seal that prevents leaks and maintains proper oil circulation—a failure here means potential engine damage and costly downtime. The COMETIC C9265F uses proven Aluminum Foamette construction to deliver reliable sealing...09350218- SKU:
- 09350218
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- OIL PAN
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- TYPE:
- TRANSMISSION
$36.70
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.
