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
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COMETIC Cylinder Head/Base Gasket C10181HB030014
COMETIC
$78.70A quality cylinder head gasket is non-negotiable for maintaining compression, preventing coolant leaks, and preserving engine integrity under high boost or sustained RPM. COMETIC's MLS design delivers the reliability you need, whether you're running...09345946- SKU:
- 09345946
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE SIZE:
- 4,250'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,014'
- BORE SIZE IMPERIAL:
- 4.250'
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,36 MM (0,014')
- THICKNESS METRIC:
- 0.36 MM
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
- UNITS:
- KIT
$78.70 -
COMETIC Cylinder Head Gasket C10181-030
COMETIC
$61.90A reliable cylinder head gasket is the foundation of any high-performance engine build—it's what stands between optimal compression and catastrophic failure. The COMETIC C10181-030 delivers multi-layer construction designed to handle extreme pressures,...09345944- SKU:
- 09345944
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- THICKNESS IMPERIAL:
- 0,030'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,250'
- BORE SIZE IMPERIAL:
- 4.250'
- MATERIAL:
- LAYERED STEEL
- RIDING STYLE:
- STREET
- UNITS:
- 2 PACK
$61.90 -
COMETIC Cylinder Head Gasket C10181
COMETIC
$61.90A cylinder head gasket failure can sideline your engine and drain your wallet fast. The COMETIC C10181 is engineered to seal under extreme pressures, temperature swings, and harsh combustion environments without compromising reliability. Built with a...09345943- SKU:
- 09345943
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- UNITS:
- 2 PACK
- BORE SIZE:
- 4,250'
- BORE SIZE IMPERIAL:
- 4.250'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- THICKNESS METRIC:
- 1.02 MM
$61.90 -
COMETIC Cam Change Gasket Kit C10178
COMETIC
$39.85A cam change requires precision gaskets and seals that can handle thermal cycling and maintain proper compression—using a mismatched or worn kit risks oil leaks and compromised engine integrity. The COMETIC C10178 provides a complete, OEM-quality gasket...09345940- SKU:
- 09345940
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- FEATURES:
- WITHOUT ROCKER COVER
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- CAM CHANGE
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$39.85Qty in Cart: 0Quantity:Price:$39.85Subtotal: -
COMETIC Cylinder Base Gasket Pair C10177-010
COMETIC
$33.55A quality cylinder base gasket is non-negotiable if you're serious about maintaining cylinder pressure and preventing coolant leaks in high-performance applications. The COMETIC C10177-010 uses multi-layer steel construction with load control embossments...09345938- SKU:
- 09345938
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- STEEL
- UNITS:
- 2 PACK
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.25 MM
- THICKNESS IMPERIAL:
- 0,010'
- TYPE:
- CYLINDER BASE
$33.55 -
COMETIC Cylinder Head/Base Gasket Pair C10166-HB-030
COMETIC
$81.85A quality cylinder head gasket is non-negotiable if you're serious about engine reliability and performance consistency. The COMETIC C10166-HB-030 uses proven Multi-Layer Steel (MLS) construction to maintain a proper seal under extreme combustion...09345922- SKU:
- 09345922
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- MATERIAL:
- LAYERED STEEL
- UNITS:
- 2 PACK
- BORE SIZE:
- 4,095'
- BORE SIZE IMPERIAL:
- 4.095'
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
$81.85 -
COMETIC Cylinder Head Gasket C10166-030
COMETIC
$61.90A cylinder head gasket is your engine's primary defense against combustion leakage, coolant seepage, and oil bypass—and when it fails, you're looking at lost compression, overheating, and catastrophic engine damage. The COMETIC C10166-030 is engineered...09345921- SKU:
- 09345921
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- BORE SIZE:
- 4,075'
- THICKNESS IMPERIAL:
- 0,030'
- UNITS:
- 2 PACK
- BORE SIZE IMPERIAL:
- 4.075'
- MATERIAL:
- LAYERED STEEL
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
$61.90 -
COMETIC Cylinder Head Gasket C10166
COMETIC
$61.90A cylinder head gasket is your engine's primary defense against combustion leakage, coolant mixing, and catastrophic failure. The COMETIC C10166 delivers reliable sealing across demanding racing conditions and high-heat environments, engineered with...09345920- SKU:
- 09345920
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- 2 PACK
- BORE SIZE:
- 4,095'
- BORE SIZE IMPERIAL:
- 4.095'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Cylinder Head Gasket C10165-030
COMETIC
$61.90A cylinder head gasket is your engine's primary seal against combustion pressure, coolant leakage, and oil migration. The COMETIC C10165-030 uses a three-layer design with stainless steel construction and Viton coating to handle extreme temperatures,...09345919- SKU:
- 09345919
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS IMPERIAL:
- 0,030'
- UNITS:
- 2 PACK
- BORE SIZE:
- 4,000'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
$61.90 -
COMETIC Cylinder Head Gasket C10164
COMETIC
$61.90A cylinder head gasket failure can cost you a race or strand you on the side of the road. The COMETIC C10164 delivers reliable sealing across a wide range of engine configurations and operating conditions, thanks to its multi-layer construction and...09345915- SKU:
- 09345915
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- BORE SIZE:
- 3,937'
- BORE SIZE IMPERIAL:
- 3.937'
- MATERIAL:
- VITON
- MATERIAL:
- LAYERED STEEL
- TYPE:
- CYLINDER HEAD
- THICKNESS IMPERIAL:
- 0,040'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- 2 PACK
$61.90 -
JAMES GASKET Head Gasket - FL JGI-16770-66SXK
JAMES GASKET
$86.95A quality head gasket is mission-critical—it's the seal that prevents combustion blow-by and coolant leaks that can compromise engine integrity and performance. The JAMES GASKET FL series delivers OEM-grade sealing reliability with superior material...09345877- SKU:
- 09345877
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- STYLE:
- STANDARD BORE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- MATERIAL:
- -
- THICKNESS IMPERIAL:
- 0,032'
- BORE SIZE IMPERIAL:
- -
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
$86.95 -
JAMES GASKET Foamet‚® Head Gasket JGI-16770-66-SX
JAMES GASKET
$34.95A reliable head gasket is the foundation of engine integrity—without it, you're risking catastrophic coolant and oil leakage that can destroy an engine in minutes. JAMES GASKET's Foamet® technology delivers superior sealing performance across extreme...09345876- SKU:
- 09345876
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- MATERIAL:
- FOAMET
$34.95 -
CUSTOM DYNAMICS Squareback Taillight Gasket TLGASKET-5PK
CUSTOM DYNAMICS
$15.80A deteriorating taillight gasket compromises the weatherproofing of your electrical system, inviting moisture, corrosion, and potential electrical failures at the worst times. This CUSTOM DYNAMICS gasket pack delivers OEM-quality sealing with the added...09345866- SKU:
- 09345866
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$15.80 -
COMETIC Derby Gasket C10140F5
COMETIC
$21.30A worn or damaged derby cover gasket compromises the seal on your Harley's primary cover, leading to oil seepage, contamination, and potential internal damage. The COMETIC Derby Gasket C10140F5 delivers a reliable, OEM-quality seal using premium...09345060- SKU:
- 09345060
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- DERBY COVER
- UNITS:
- 5 PACK
$21.30 -
COMETIC Complete Gasket Kit - Buell C10142
COMETIC
$288.70A complete gasket kit is your insurance policy against oil seepage, coolant leaks, and combustion blowby that compromise engine reliability and performance. Cometic's C10142 kit eliminates the guesswork of sourcing individual gaskets by bundling every...09345058- SKU:
- 09345058
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- BORE SIZE IMPERIAL:
- STANDARD
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- BORE SIZE:
- STANDARD
- MATERIAL:
- FOAM
- TYPE:
- COMPLETE
- UNITS:
- KIT
$288.70Qty in Cart: 0Quantity:Price:$288.70Subtotal: -
COMETIC Push Rod Gasket Kit - XL C10133
COMETIC
$19.90Push rod seals are critical to maintaining oil pressure and preventing leakage in high-stress engine environments. The COMETIC C10133 kit delivers reliable sealing with Viton® O-rings engineered to withstand extreme temperatures and demanding race...09345052- SKU:
- 09345052
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- PUSHROD
- UNITS:
- KIT
- MATERIAL:
- VITON
$19.90Qty in Cart: 0Quantity:Price:$19.90Subtotal: -
COMETIC Complete Gasket Kit - 110" C10128-040
COMETIC
$169.00A complete gasket kit eliminates the guesswork when rebuilding or refreshing your 110" engine—you get every seal and gasket engineered for your application in one package, reducing installation time and the risk of mismatched components causing leaks...09345051- SKU:
- 09345051
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE:
- 4,000'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- MOTOR
- UNITS:
- KIT
- MATERIAL:
- STEEL
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$169.00 -
COMETIC Complete Gasket Kit - 110" C10128
COMETIC
$169.00A complete gasket kit is the foundation of any reliable engine build—one failed gasket can compromise your entire engine's integrity and sideline your project. The COMETIC C10128 eliminates guesswork by pairing application-specific materials in a single,...09345050- SKU:
- 09345050
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MATERIAL:
- STEEL
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- MOTOR
- UNITS:
- KIT
- BORE SIZE:
- 4,000'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 4.000'
$169.00Qty in Cart: 0Quantity:Price:$169.00Subtotal: -
COMETIC Base Seal Gasket C10127
COMETIC
$10.95A failing base seal gasket compromises your Sportster's combustion integrity and invites oil seepage that can damage your engine block and transmission housing. The COMETIC Base Seal Gasket C10127 is engineered to maintain a perfect seal under extreme...09345049- SKU:
- 09345049
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- MATERIAL:
- VITON
$10.95 -
COMETIC Primary Gasket Kit C9125
COMETIC
$43.00A primary gasket kit is only as reliable as its ability to seal under extreme heat and pressure—and factory gaskets often fail prematurely, leading to oil leaks and loss of performance. Cometic's C9125 Primary Gasket Kit uses proprietary AFM (Aluminum...09344801- SKU:
- 09344801
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- PRIMARY
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
$43.00Qty in Cart: 0Quantity:Price:$43.00Subtotal:
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.
