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 Oil Pan Gasket - M8 C10243
COMETIC
$22.00A leaking oil pan gasket compromises engine lubrication and creates mess under your bay—neither acceptable for serious racers or meticulous builders. The COMETIC M8 C10243 delivers a complete gasket solution engineered specifically for your application,...09346335- SKU:
- 09346335
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PAN
$22.00 -
COMETIC Trans Top Cover Gasket - M8 C10246
COMETIC
$25.15A leaking transmission top cover gasket compromises hydraulic integrity and invites contamination into your gearbox—exactly what you don't need mid-race or mid-project. The COMETIC Trans Top Cover Gasket delivers a complete, application-specific seal kit...09346336- SKU:
- 09346336
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- TRANSMISSION TOP COVER
- UNITS:
- EACH
$25.15 -
COMETIC Breather Gasket Kit - Twin Cam C10161
COMETIC
$20.95A breather system that weeps oil or allows blow-by gases to escape is a sign of worn gaskets and seals—problems that compound quickly under boost or high RPM operation. The COMETIC Breather Gasket Kit gives you everything needed for a complete, leak-free...09346002- SKU:
- 09346002
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- TYPE:
- BREATHER
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$20.95Qty in Cart: 0Quantity:Price:$20.95Subtotal: -
COMETIC Primary Gasket C10211
COMETIC
$33.55A primary gasket kit is the foundation of a reliable engine seal—critical for preventing oil leaks, maintaining proper combustion pressure, and avoiding costly internal damage. The Cometic C10211 uses advanced AFM material that withstands extreme heat...09345980- SKU:
- 09345980
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- UNITS:
- EACH
$33.55 -
COMETIC Transmission Lid Gasket C10216
COMETIC
$8.95Transmission fluid leaks compromise both performance and engine longevity, and a worn gasket is often the culprit. The COMETIC C10216 transmission lid gasket eliminates seepage with a proven aluminum foamette construction that maintains integrity across...09345983- SKU:
- 09345983
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- TRANSMISSION TOP COVER
- UNITS:
- EACH
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
$8.95 -
COMETIC Cylinder Head Gasket C10167-030
COMETIC
$61.90A cylinder head gasket failure can sideline your engine, but the COMETIC C10167-030 is engineered to handle extreme pressures, temperatures, and surface variations without compromise. Built with a stainless steel shim layer and dual Viton-coated outer...09345924- SKU:
- 09345924
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- BORE SIZE:
- 4,145'
- MATERIAL:
- LAYERED STEEL
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 4.145'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 2 PACK
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
$61.90 -
COMETIC Primary Gasket Kit C9886
COMETIC
$138.55A primary gasket failure can leave you stranded and cost thousands in engine damage. The COMETIC C9886 Primary Gasket Kit eliminates guesswork with precision-engineered AFM gaskets that handle extreme heat cycles while maintaining rock-solid torque...09340742- SKU:
- 09340742
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$138.55Qty in Cart: 0Quantity:Price:$138.55Subtotal: -
COMETIC Primary Gasket Kit C9885
COMETIC
$138.55A primary gasket failure can sideline your build and cost you race time. The COMETIC C9885 Primary Gasket Kit eliminates guesswork with precision-engineered AFM gaskets that handle extreme heat cycles while maintaining consistent torque retention—no...09340743- SKU:
- 09340743
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- UNITS:
- KIT
$138.55 -
COMETIC Rocker Gasket - .020" C9563
COMETIC
$20.10Rocker cover gaskets are critical sealing components that prevent oil weepage and contamination in your engine's valve train. A failed or deteriorating gasket compromises engine cleanliness and can lead to costly oil loss and potential bearing damage...09340748- SKU:
- 09340748
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER BASE
- THICKNESS:
- 0,51 MM (0,020')
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.51 MM
- UNITS:
- 5 PACK
$20.10 -
COMETIC Rocker Gasket - .020" C9561
COMETIC
$16.90Rocker cover gaskets are critical sealing components that prevent oil leakage at high RPM and under sustained boost pressure. A degraded or worn gasket compromises engine bay cleanliness and can lead to oil loss that affects engine performance and...09340749- SKU:
- 09340749
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- LOWER
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER BASE
$16.90 -
COMETIC Rocker Gasket - Evo C9866
COMETIC
$61.30Rocker cover gaskets endure extreme temperature swings and constant pressure cycles—failure here means oil seepage, contamination, and potential engine damage. The COMETIC Rocker Gasket C9866 combines a stainless steel core with precision Viton sealing...09340751- SKU:
- 09340751
- Availability:
- Ships Same Business Day
- Weight:
- 0.57 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- ROCKER COVER BASE
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
$61.30Qty in Cart: 0Quantity:Price:$61.30Subtotal: -
COMETIC Rocker Gasket Kit - XL C9954
COMETIC
$65.05Rocker box gasket failure compromises engine sealing and invites oil leakage that can damage surrounding components. The COMETIC Rocker Gasket Kit C9954 delivers a complete sealing solution with premium materials engineered for reliability and longevity,...09340752- SKU:
- 09340752
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- MODEL:
- EST
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- STEEL
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$65.05Qty in Cart: 0Quantity:Price:$65.05Subtotal: -
COMETIC Rocker Gasket - .020" C9986
COMETIC
$30.40Rocker cover gaskets endure extreme temperature cycling and constant pressure—a failure here means oil leaks, contamination, and potential engine damage. The COMETIC C9986 delivers reliable sealing with a proven Viton elastomer design, keeping your...09340753- SKU:
- 09340753
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- ROCKER COVER BASE
- UNITS:
- PAIR
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.51 MM
$30.40 -
COMETIC Inspection Cover Gasket - FX C9331F5
COMETIC
$18.40A leaking inspection cover gasket compromises engine seal integrity and can lead to oil seepage that damages surrounding components. The COMETIC C9331F5 delivers a precision-engineered seal that prevents fluid loss while maintaining factory fitment...20111495- SKU:
- 20111495
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 5 PACK
- TYPE:
- INSPECTION COVER
- THICKNESS:
- 1,52 MM (0,060')
$18.40Qty in Cart: 0Quantity:Price:$18.40Subtotal: -
COMETIC Top End Gasket - Big Bore - Big Twin - EST C9767
COMETIC
$176.35A top-end rebuild demands precision sealing—any gasket failure means catastrophic engine damage and costly downtime. The COMETIC EST C9767 eliminates hot spots that cause premature gasket failure by actively drawing heat away from the combustion ring and...DS172079- SKU:
- DS172079
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- MATERIAL:
- STAINLESS STEEL
- BORE SIZE IMPERIAL:
- 3.625'
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- RUBBER
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE:
- 3,625'
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
$176.35Qty in Cart: 0Quantity:Price:$176.35Subtotal: -
COMETIC Top End Gasket - Big Twin - EST C9635
COMETIC
$142.75A top-end rebuild demands gaskets engineered to survive extreme combustion temperatures and cylinder pressures—and Cometic's EST technology delivers exactly that. The embossed stainless steel construction with proprietary rubber facing eliminates hot...DS172080- SKU:
- DS172080
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
$142.75 -
COMETIC Top End Gasket - Big Twin - EST C9747
COMETIC
$142.75Gasket failure compromises cylinder sealing and leads to combustion pressure loss, oil leakage, and costly downtime. COMETIC's EST gaskets eliminate hot spots through advanced heat dissipation, delivering reliable sealing across repeated heat cycles that...DS172081- SKU:
- DS172081
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
$142.75 -
COMETIC Top End Gasket Kit - Twin Cam 88 - EST C9779
COMETIC
$183.70A top-end gasket failure can sideline your Twin Cam 88 when you can least afford it. COMETIC's EST (Extreme Sealing Technology) kits eliminate the guesswork with precision-engineered gaskets designed to manage combustion heat and prevent hot spots that...DS172084- SKU:
- DS172084
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STAINLESS STEEL
- BORE SIZE IMPERIAL:
- 3.750'
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE SIZE:
- 3,750'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$183.70 -
COMETIC Engine Gasket Kit - 110" C10157
COMETIC
$287.65A complete gasket failure can sideline your engine and derail your season. The COMETIC C10157 110" gasket kit uses purpose-engineered materials for each sealing application, ensuring reliable compression and leak-free performance across the entire motor...09345074- SKU:
- 09345074
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$287.65 -
COMETIC Engine Gasket Kit - 110" C10157-030
COMETIC
$287.65A complete engine gasket failure can leave you stranded—or worse, damage an otherwise solid build. The COMETIC C10157-030 gasket kit eliminates guesswork by providing OEM-quality sealing across your entire engine, using purpose-engineered materials for...09345075- SKU:
- 09345075
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
$287.65Qty in Cart: 0Quantity:Price:$287.65Subtotal:
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.
