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
-
On Sale
COMETIC Top End Gasket - XL 1200 C9177
COMETIC
MSRP: $142.75Now: $134.00Was: $142.75Top-end gasket failure can sideline your engine at the worst possible moment—Cometic's EST (Extreme Sealing Technology) gasket kit eliminates the guesswork with precision-engineered components designed to maintain a reliable seal under the extreme heat...09341225- SKU:
- 09341225
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- TYPE:
- TOP END
- DISPLACEMENT:
- 1200 CC
- MATERIAL:
- RUBBER
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
MSRP: $142.75Now: $134.00Was: $142.75 -
On Sale
COMETIC Primary Gasket C9179F1
COMETIC
MSRP: $46.15Now: $43.00Was: $46.15A primary gasket kit is only as reliable as its ability to seal under extreme heat and pressure—and the COMETIC C9179F1 delivers where it counts. Built with Cometic's AFM (Aluminum Foamette Material) technology, this gasket maintains a rock-solid seal...09341226- SKU:
- 09341226
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
MSRP: $46.15Now: $43.00Was: $46.15Qty in Cart: 0Quantity:Price:MSRP: $46.15Now: $43.00Was: $46.15Subtotal: -
On Sale
COMETIC Complete Gasket Kit - FL 103 C9185
COMETIC
MSRP: $287.65Now: $270.00Was: $287.65A complete gasket kit is insurance against combustion leaks, oil seepage, and catastrophic engine failure. The COMETIC FL 103 C9185 eliminates the guesswork of sourcing individual gaskets by delivering every seal your engine needs in one comprehensive...09341230- SKU:
- 09341230
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.875'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- BORE SIZE:
- 3,875'
- MATERIAL:
- VITON
- TYPE:
- COMPLETE
- MATERIAL:
- STEEL
MSRP: $287.65Now: $270.00Was: $287.65 -
On Sale
COMETIC Complete Gasket Kit - Dyna C9186
COMETIC
MSRP: $287.65Now: $270.00Was: $287.65A complete gasket kit eliminates the guesswork and risk of mixing incompatible gasket materials across your engine bay. COMETIC's C9186 uses purpose-built materials for each gasket application—MLS head gaskets for cylinder sealing, Viton coatings for oil...09341231- SKU:
- 09341231
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE:
- 3,875'
- MATERIAL:
- VITON
- TYPE:
- COMPLETE
- BORE SIZE IMPERIAL:
- 3.875'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- UNITS:
- KIT
MSRP: $287.65Now: $270.00Was: $287.65 -
On Sale
COMETIC Trans End Cover Gasket - Twin Cam C9188
COMETIC
Now: $19.00Was: $19.90A failing transmission end cover gasket can lead to costly fluid leaks and contamination that compromise your entire drivetrain. The COMETIC C9188 eliminates guesswork with a precision-engineered gasket that seals reliably without additional sealant,...09341233- SKU:
- 09341233
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- THICKNESS:
- 1,52 MM (0,060')
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- END COVER
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- CLUTCH RELEASE
Now: $19.00Was: $19.90 -
On Sale
COMETIC Transmission Top Cover Gasket Cover - Twin Cam C9189
COMETIC
Now: $17.00Was: $18.50A leaking transmission cover gasket compromises both performance and reliability—and replacement gaskets that require messy sealer applications add unnecessary labor time. The COMETIC C9189 Transmission Top Cover Gasket eliminates that hassle with its...09341234- SKU:
- 09341234
- Availability:
- Ships Same Business Day
- Weight:
- 0.27 LBS
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- TRANSMISSION TOP COVER
- THICKNESS:
- 1,52 MM (0,060')
Now: $17.00Was: $18.50 -
On Sale
COMETIC Rocker Box Kit - XL C9195
COMETIC
MSRP: $65.05Now: $61.00Was: $65.05Rocker box failures can sideline your engine and drain your wallet. The COMETIC Rocker Box Kit C9195 eliminates downtime by providing all the premium gaskets, seals, and O-rings you need for a complete, reliable service on both rocker boxes. Built with...09341236- SKU:
- 09341236
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- MATERIAL:
- STEEL
- MODEL:
- EST
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
MSRP: $65.05Now: $61.00Was: $65.05Qty in Cart: 0Quantity:Price:MSRP: $65.05Now: $61.00Was: $65.05Subtotal: -
On Sale
COMETIC Exhaust Gasket - EVO/Twin Cam C9540
COMETIC
Now: $56.00Was: $59.20Exhaust gasket failure leads to costly leaks, performance loss, and potential engine damage—especially under high heat and boost conditions. The COMETIC C9540 eliminates these risks with a dual-layer construction designed to withstand extreme...09341237- SKU:
- 09341237
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- EXHAUST PORT
- RIDING STYLE:
- STREET
- MATERIAL:
- GRAPHITE
- MATERIAL:
- STAINLESS STEEL
- UNITS:
- 10 PACK
Now: $56.00Was: $59.20 -
On Sale
COMETIC Exhaust Gasket - VROD C9928
COMETIC
MSRP: $15.95Now: $15.00Was: $15.95Exhaust gasket failure is a common source of leaks that compromise performance and create costly complications down the line. The COMETIC C9928 is engineered to withstand extreme exhaust temperatures and the punishment of high-horsepower applications,...09341239- SKU:
- 09341239
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- PAIR
- PRODUCT NAME:
- GASKET
- MATERIAL:
- GRAPHITE
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
MSRP: $15.95Now: $15.00Was: $15.95 -
On Sale
COMETIC Complete Gasket Kit - FLT C9778F
COMETIC
MSRP: $282.40Now: $265.00Was: $282.40A complete gasket kit eliminates the guesswork when rebuilding or refreshing your engine—you get every seal you need in one package, engineered to handle both street and race applications. Cometic's use of Multi-Layer Steel head gaskets and Viton-coated...09340728- SKU:
- 09340728
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- TYPE:
- COMPLETE
- UNITS:
- KIT
- BORE SIZE:
- 3,750'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE IMPERIAL:
- 3.750'
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
MSRP: $282.40Now: $265.00Was: $282.40 -
On Sale
COMETIC Complete Gasket - Softail/FXD C9751F
COMETIC
MSRP: $356.95Now: $336.00Was: $356.95A complete gasket failure can cost you a race—or worse, leave you stranded with a seized engine. The COMETIC Complete Gasket Kit for Softail/FXD eliminates guesswork by providing every critical seal your engine needs, engineered with purpose-built...09340730- SKU:
- 09340730
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE:
- 3,500'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 3.500'
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $356.95Now: $336.00Was: $356.95 -
On Sale
COMETIC Motor Gasket Kit - Standard - EVO C9891
COMETIC
MSRP: $183.70Now: $173.00Was: $183.70A complete gasket failure can end your race day—or worse, cost you an engine. The COMETIC Motor Gasket Kit C9891 delivers OEM-quality sealing across all critical engine surfaces, using race-proven materials that maintain their integrity under extreme...09340732- SKU:
- 09340732
- Availability:
- Ships Same Business Day
- Weight:
- 1.67 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- STEEL
- TYPE:
- MOTOR
- UNITS:
- KIT
MSRP: $183.70Now: $173.00Was: $183.70 -
On Sale
COMETIC Motor Gasket Kit - Standard - EVO C9890
COMETIC
MSRP: $159.55Now: $150.00Was: $159.55A complete gasket failure can sideline your engine and compromise every component downstream. The COMETIC Motor Gasket Kit – Standard (C9890) delivers OEM-quality sealing across your entire engine using premium materials engineered to handle sustained...09340733- SKU:
- 09340733
- Availability:
- Ships Same Business Day
- Weight:
- 1.67 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- MOTOR
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
MSRP: $159.55Now: $150.00Was: $159.55 -
On Sale
COMETIC Complete Gasket Kit - Standard - XB9 C9857
COMETIC
MSRP: $202.60Now: $190.00Was: $202.60A complete gasket failure can leave you stranded—or worse, cost you a race. The COMETIC Complete Gasket Kit C9857 eliminates guesswork by providing every gasket your XB9 engine needs, engineered with premium materials proven to handle sustained...09340734- SKU:
- 09340734
- Availability:
- Ships Same Business Day
- Weight:
- 1.75 LBS
- BORE SIZE IMPERIAL:
- STANDARD
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- BORE SIZE:
- STANDARD
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
MSRP: $202.60Now: $190.00Was: $202.60Qty in Cart: 0Quantity:Price:MSRP: $202.60Now: $190.00Was: $202.60Subtotal: -
On Sale
COMETIC Motor Gasket Kit - XL - .030" C9953
COMETIC
MSRP: $202.60Now: $190.00Was: $202.60A complete gasket failure can sideline your engine and drain your wallet. The COMETIC Motor Gasket Kit XL delivers OEM-quality sealing with race-grade materials engineered to handle high boost, extreme cylinder pressures, and sustained performance...09340735- SKU:
- 09340735
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE IMPERIAL:
- 3.500'
- TYPE:
- COMPLETE
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,500'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.76 MM
MSRP: $202.60Now: $190.00Was: $202.60 -
On Sale
COMETIC Oil Jet Gasket - XL C9962
COMETIC
Now: $8.00Was: $8.50Oil jet gaskets are critical sealing components in high-performance engines where precision oiling systems deliver fuel and coolant directly to combustion chambers and bearing surfaces. The COMETIC C9962 XL Oil Jet Gasket ensures a leak-free seal under...09340737- SKU:
- 09340737
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- UNITS:
- 6 PACK
- MATERIAL:
- FIBER
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- OIL JET ASSEMBLY
Now: $8.00Was: $8.50Qty in Cart: 0Quantity:Price:Now: $8.00Was: $8.50Subtotal: -
On Sale
COMETIC Top End Gasket -.045" C9951
COMETIC
MSRP: $150.10Now: $141.00Was: $150.10Top-end gasket failure doesn't just waste your time—it compromises engine reliability and performance when you need it most. The COMETIC C9951 EST gasket kit eliminates thermal hot spots that lead to premature failure, keeping your combustion chamber...09340755- SKU:
- 09340755
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- THICKNESS IMPERIAL:
- 0,045'
- THICKNESS METRIC:
- 1.14 MM
- TYPE:
- TOP END
- BORE SIZE:
- 3,875'
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- DISPLACEMENT:
- 95'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE IMPERIAL:
- 3.875'
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- STREET
MSRP: $150.10Now: $141.00Was: $150.10 -
On Sale
COMETIC Top End Gasket - 1200 XL C9970
COMETIC
MSRP: $142.75Now: $134.00Was: $142.75Top-end gasket failures compromise combustion seal integrity and lead to costly downtime. COMETIC's EST (Extreme Sealing Technology) kit eliminates hot spots that cause premature gasket degradation by actively drawing heat away from the combustion ring...09340759- SKU:
- 09340759
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- TOP END
- DISPLACEMENT:
- 1200 CC
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 1.02 MM
MSRP: $142.75Now: $134.00Was: $142.75 -
On Sale
COMETIC Top End Gasket - 1200 XL C9854F
COMETIC
MSRP: $142.75Now: $134.00Was: $142.75Top-end gasket failure doesn't just cost you downtime—it costs you races. The COMETIC C9854F EST gasket kit eliminates the hot spots and uneven heat distribution that compromise seal integrity, delivering the reliability you need when it matters most...09340760- SKU:
- 09340760
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- RUBBER
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,030'
- TYPE:
- TOP END
- DISPLACEMENT:
- 1200 CC
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- UNITS:
- KIT
MSRP: $142.75Now: $134.00Was: $142.75 -
On Sale
COMETIC Top End Gasket - 3-13/16" C9768
COMETIC
MSRP: $173.20Now: $163.00Was: $173.20A top-end rebuild demands precision sealing—any compromise in gasket quality leads to combustion leakage, oil weeping, and premature failure. The COMETIC C9768 uses Extreme Sealing Technology (EST) with embossed stainless steel construction and a...09340764- SKU:
- 09340764
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE IMPERIAL:
- 3.8125'
- MATERIAL:
- STAINLESS STEEL
- BORE SIZE:
- 3,8125'
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- UNITS:
- KIT
- MATERIAL:
- RUBBER
MSRP: $173.20Now: $163.00Was: $173.20
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.
