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 Top End Gasket - XL 1200 C9177
COMETIC
$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...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
$142.75 -
COMETIC Primary Gasket C9179F1
COMETIC
$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)...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')
$46.15Qty in Cart: 0Quantity:Price:$46.15Subtotal: -
COMETIC Complete Gasket Kit - FL 103 C9185
COMETIC
$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...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
$287.65 -
COMETIC Complete Gasket Kit - Dyna C9186
COMETIC
$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...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
$287.65 -
COMETIC Trans End Cover Gasket - Twin Cam C9188
COMETIC
$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...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
$19.90Qty in Cart: 0Quantity:Price:$19.90Subtotal: -
COMETIC Transmission Top Cover Gasket Cover - Twin Cam C9189
COMETIC
$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...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')
$18.50 -
COMETIC Rocker Box Kit - XL C9195
COMETIC
$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...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
$65.05 -
COMETIC Exhaust Gasket - EVO/Twin Cam C9540
COMETIC
$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...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
$59.20 -
COMETIC Exhaust Gasket - VROD C9928
COMETIC
$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...09341239- SKU:
- 09341239
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- PAIR
- PRODUCT NAME:
- GASKET
- MATERIAL:
- GRAPHITE
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
$15.95 -
COMETIC Complete Gasket Kit - FLT C9778F
COMETIC
$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...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
$282.40 -
COMETIC Complete Gasket - Softail/FXD C9751F
COMETIC
$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...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
$356.95Qty in Cart: 0Quantity:Price:$356.95Subtotal: -
COMETIC Motor Gasket Kit - Standard - EVO C9891
COMETIC
$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...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
$183.70 -
COMETIC Motor Gasket Kit - Standard - EVO C9890
COMETIC
$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...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
$159.55 -
COMETIC Complete Gasket Kit - Standard - XB9 C9857
COMETIC
$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...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
$202.60 -
COMETIC Motor Gasket Kit - XL - .030" C9953
COMETIC
$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,...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
$202.60 -
COMETIC Oil Jet Gasket - XL C9962
COMETIC
$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...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
$8.50 -
COMETIC Top End Gasket -.045" C9951
COMETIC
$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...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
$150.10Qty in Cart: 0Quantity:Price:$150.10Subtotal: -
COMETIC Top End Gasket - 1200 XL C9970
COMETIC
$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...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
$142.75 -
COMETIC Top End Gasket - 1200 XL C9854F
COMETIC
$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,...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
$142.75 -
COMETIC Top End Gasket - 3-13/16" C9768
COMETIC
$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)...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
$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.
