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 Trans Gasket - Twin Cam C9639
COMETIC
$47.20Transmission gasket failures compromise seal integrity and lead to costly fluid leaks and internal damage. The COMETIC Trans Gasket C9639 delivers application-specific engineering with precision-fitted materials designed to maintain reliable sealing...09340826- SKU:
- 09340826
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- TYPE:
- TRANSMISSION
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
$47.20Qty in Cart: 0Quantity:Price:$47.20Subtotal: -
COMETIC Trans Gasket - Big Twin C9464F
COMETIC
$45.10Transmission gasket failure is one of the most common reasons for fluid leaks and costly rebuilds on Big Twin engines. The COMETIC Trans Gasket C9464F eliminates guesswork by providing a complete, application-specific seal kit engineered to withstand the...09340827- SKU:
- 09340827
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TRANSMISSION
- UNITS:
- KIT
$45.10 -
COMETIC Trans Gasket - 4 Speed C9465
COMETIC
$67.15Transmission gasket failures lead to fluid leaks, loss of pressure, and catastrophic drivetrain damage—exactly what you can't afford during competition or spirited driving. The COMETIC Trans Gasket C9465 eliminates guesswork with application-specific...09340828- SKU:
- 09340828
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
- TYPE:
- TRANSMISSION
$67.15 -
COMETIC One Piece Rocker Base - Evo C9865
COMETIC
$22.00A failing rocker box gasket means oil seepage, contamination, and potential engine damage—exactly what you can't afford on track or in the shop. The COMETIC One Piece Rocker Base gasket eliminates the weak points of multi-piece designs with a...09340001- SKU:
- 09340001
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- TYPE:
- ROCKER BOX
$22.00 -
COMETIC Base Gasket - Evo - 1340 - .020" C9870
COMETIC
$33.55A proper head gasket is non-negotiable for any Evo build seeking reliable power and consistent cylinder pressure. The COMETIC MLS design distributes clamping force evenly across the sealing surface, reducing bore distortion and maximizing ring...09340004- SKU:
- 09340004
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD
- THICKNESS METRIC:
- 0.51 MM
- BORE SIZE IMPERIAL:
- 3.8125'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
$33.55 -
COMETIC Base Gasket - Evo - 4" - .020" C9872
COMETIC
$33.55A compromised head gasket is a ticking time bomb for any serious Evo build—it'll cost you power, reliability, and credibility on the track. The COMETIC Base Gasket delivers the precision sealing and durability your engine demands, with MLS construction...09340006- SKU:
- 09340006
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS METRIC:
- 0.51 MM
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- STYLE:
- STANDARD
$33.55 -
COMETIC Cylinder Head/Base Gasket Pair C10167-HB-030
COMETIC
$81.85A quality head gasket is non-negotiable for engine reliability and performance. The COMETIC C10167-HB-030 uses proven Multi-Layer Steel (MLS) construction to withstand combustion pressures, thermal cycling, and boost—whether you're running stock power or...09345927- SKU:
- 09345927
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- UNITS:
- 2 PACK
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 4.145'
- RIDING STYLE:
- STREET
- BORE SIZE:
- 4,145'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
$81.85 -
COMETIC Tappet Cover Gasket C10172
COMETIC
$23.30A failing tappet cover gasket compromises engine seal integrity and invites oil leakage that can damage surrounding components. The COMETIC Tappet Cover Gasket C10172 delivers reliable sealing performance with OEM-quality construction, ensuring your...09345933- SKU:
- 09345933
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- MOUNTING POSITION:
- FRONT
- MOUNTING POSITION:
- REAR
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- TYPE:
- TAPPET COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
$23.30 -
COMETIC Cam Cover Gasket 5 Pack C10173
COMETIC
$24.80Cam cover gaskets are a wear item that deteriorates with heat cycles and engine vibration—a failed gasket leads to oil seepage, reduced engine cleanliness, and potential damage to ignition components. The COMETIC Cam Cover Gasket 5 Pack gives you...09345934- SKU:
- 09345934
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CAM COVER
- UNITS:
- 5 PACK
$24.80 -
COMETIC Piston Jet Gasket Pair C10174
COMETIC
$5.95Piston jet gaskets are critical sealing components that prevent oil leakage in your engine's cooling gallery system. A compromised gasket leads to oil loss, potential engine overheating, and catastrophic failure under high-RPM conditions. The COMETIC...09345935- SKU:
- 09345935
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- PISTON JET COOLER
- UNITS:
- 2 PACK
- THICKNESS IMPERIAL:
- 0,032'
$5.95Qty in Cart: 0Quantity:Price:$5.95Subtotal: -
COMETIC Cylinder Base Gasket Pair C10177
COMETIC
$33.55A properly sealed cylinder base is non-negotiable for reliable power and longevity in high-performance engines. The COMETIC C10177 delivers precision sealing with multi-layer construction designed to handle extreme pressures, temperature swings, and...09345937- SKU:
- 09345937
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.36 MM
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,014'
- TYPE:
- CYLINDER BASE
- UNITS:
- 2 PACK
$33.55 -
COMETIC Cylinder Head Gasket C10192
COMETIC
$61.90A cylinder head gasket is your engine's first line of defense against combustion blow-by and coolant leakage—failure here means catastrophic engine damage. The COMETIC C10192 uses a multi-layer design with stainless steel construction and Viton sealing...09345953- SKU:
- 09345953
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE:
- 4,320'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER HEAD
- RIDING STYLE:
- STREET
- UNITS:
- 2 PACK
- BORE SIZE IMPERIAL:
- 4.320'
- MATERIAL:
- LAYERED STEEL
$61.90 -
COMETIC Cylinder Head Gasket C10193
COMETIC
$61.90A cylinder head gasket is your engine's primary defense against combustion blow-by, coolant mixing, and oil seepage—failures that cascade into catastrophic engine damage. The COMETIC C10193 is engineered for demanding racing and high-boost applications...09345955- SKU:
- 09345955
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE IMPERIAL:
- 4.500'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- 2 PACK
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,500'
- MATERIAL:
- LAYERED STEEL
$61.90 -
COMETIC Cylinder Head/Base Gasket C10193-HB
COMETIC
$81.85A compromised cylinder head or base gasket will cost you more in downtime and engine damage than the price of this kit. The COMETIC C10193-HB uses Multi-Layer Steel (MLS) construction to maintain a reliable seal under high combustion pressures and...09345956- SKU:
- 09345956
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE IMPERIAL:
- 4.500'
- THICKNESS IMPERIAL:
- 0,014'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- THICKNESS:
- 0,36 MM (0,014')
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,500'
- MATERIAL:
- LAYERED STEEL
- THICKNESS METRIC:
- 0.36 MM
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,02 MM (0,040')
$81.85 -
COMETIC Cylinder Base Gasket Pair C10194
COMETIC
$33.55A properly sealed cylinder base is non-negotiable for consistent power delivery and engine longevity. The COMETIC C10194 uses multi-layer steel construction with load control embossments to distribute clamping force evenly across the gasket surface,...09345957- SKU:
- 09345957
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- STEEL
- THICKNESS IMPERIAL:
- 0,014'
- UNITS:
- 2 PACK
- BORE SIZE IMPERIAL:
- 4.320'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.36 MM
- TYPE:
- CYLINDER BASE
$33.55 -
COMETIC Oil Filler Gasket C9266F
COMETIC
$36.70Oil filler gaskets are a critical seal point in your engine's breathing system—a failure here means potential oil leakage, contamination, and loss of pressure integrity. The COMETIC C9266F eliminates guesswork with a proven Aluminum Foamette construction...09341387- SKU:
- 09341387
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- TRANSMISSION
- THICKNESS IMPERIAL:
- 0,032'
- TYPE:
- OIL FILLER
$36.70 -
COMETIC Speed Drive Gasket C9512F
COMETIC
$5.30Eliminate guesswork at the gasket line with the COMETIC Speed Drive Gasket C9512F—a purpose-built solution engineered to handle high-RPM demands without the headache of traditional sealer application. The aluminum foamette construction provides superior...09341388- SKU:
- 09341388
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- SPEEDOMETER DRIVE
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- UNITS:
- 10 PACK
$5.30 -
COMETIC Trans Top Cover Gasket C9645F
COMETIC
$18.60A quality head gasket is the foundation of engine reliability—especially when you're pushing high horsepower and boost levels. The COMETIC C9645F combines multi-layered steel construction with advanced sealing technology to handle extreme cylinder...09341391- SKU:
- 09341391
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 10 PACK
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- TRANSMISSION TOP COVER
$18.60Qty in Cart: 0Quantity:Price:$18.60Subtotal: -
COMETIC Air Cleaner Gasket C9301
COMETIC
$13.30A worn or damaged air cleaner gasket compromises your engine's intake seal, allowing unfiltered air to bypass your filter element and introducing contaminants directly into the combustion chamber. The COMETIC C9301 restores that critical seal with...09341394- SKU:
- 09341394
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 20 PACK
- PRODUCT NAME:
- GASKET
- TYPE:
- AIR CLEANER
$13.30 -
COMETIC Outer Rocker Gasket C9196
COMETIC
$22.00Rocker cover gaskets endure constant thermal cycling and oil exposure—factory gaskets fail prematurely under sustained engine loads. The COMETIC C9196 delivers reliable sealing with a dual-layer Viton design that resists oil degradation and maintains...09341395- SKU:
- 09341395
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- SILICONE
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- MOUNTING POSITION:
- LOWER
- MOUNTING POSITION:
- OUTER
- TYPE:
- ROCKER COVER
$22.00
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.
