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 - 70 & 80" C9967
COMETIC
MSRP: $135.40Now: $127.00Was: $135.40A failed top end gasket means downtime, lost performance, and potential engine damage. COMETIC's EST (Extreme Sealing Technology) gasket kit eliminates hot spots and uneven combustion pressure by actively drawing heat away from the critical sealing...09340768- SKU:
- 09340768
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- MATERIAL:
- ALUMINUM
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- FOAM
- MATERIAL:
- STEEL
- TYPE:
- TOP END
MSRP: $135.40Now: $127.00Was: $135.40 -
On Sale
COMETIC Base Gasket - 3-5/8" C9989
COMETIC
MSRP: $33.55Now: $32.00Was: $33.55A failing head gasket compromises combustion sealing, kills power output, and invites coolant leaks that can wreck your engine. The COMETIC Base Gasket C9989 uses multi-layer steel construction with load-control embossments to distribute clamping force...09340784- SKU:
- 09340784
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- BORE SIZE IMPERIAL:
- 3.625'
- MATERIAL:
- RUBBER
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- MATERIAL:
- STEEL
- STYLE:
- STANDARD
- THICKNESS:
- STOCK
- THICKNESS METRIC:
- 0.51 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
MSRP: $33.55Now: $32.00Was: $33.55Qty in Cart: 0Quantity:Price:MSRP: $33.55Now: $32.00Was: $33.55Subtotal: -
On Sale
COMETIC Cam Cover Gasket - XL C9944F5
COMETIC
Now: $24.00Was: $25.60A failing cam cover gasket is one of the most common sources of oil seepage in high-performance engines, robbing you of reliability and creating messy engine bays. The COMETIC Cam Cover Gasket XL C9944F5 delivers OEM-equivalent sealing with superior...09340785- SKU:
- 09340785
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CAM COVER
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
Now: $24.00Was: $25.60 -
On Sale
COMETIC Cam Gasket Kit C9664
COMETIC
MSRP: $73.45Now: $69.00Was: $73.45A cam change demands precision—and a single missed gasket or seal can compromise your engine's integrity and cost you race time or track days. The COMETIC Cam Gasket Kit C9664 bundles every gasket, seal, O-ring, and cork washer you need in one purchase,...09340786- SKU:
- 09340786
- Availability:
- Ships Same Business Day
- Weight:
- 0.37 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- CAM CHANGE
- UNITS:
- KIT
- RIDING STYLE:
- STREET
MSRP: $73.45Now: $69.00Was: $73.45 -
On Sale
COMETIC Head Gasket - 4.125 - .040" C9743
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A quality head gasket is critical to maintaining proper combustion chamber sealing under extreme pressure and temperature—failure here cascades into lost compression, coolant leaks, and catastrophic engine damage. The COMETIC C9743 uses multi-layer steel...09340790- SKU:
- 09340790
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 1,02 MM (0,040')
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Primary Gasket C9607F5
COMETIC
Now: $113.00Was: $120.50A primary gasket is a critical sealing component in your engine's transmission or primary drive system—failure here means oil leaks, contamination, and potential drivetrain damage. The COMETIC C9607F5 is engineered to provide reliable, long-lasting...20111489- SKU:
- 20111489
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- PRIMARY COVER
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
Now: $113.00Was: $120.50 -
On Sale
COMETIC Primary Gasket C9308F5
COMETIC
Now: $113.00Was: $120.50A primary gasket is critical to maintaining a sealed, leak-free crankcase—essential for preserving oil pressure and preventing contamination that can compromise engine reliability. The COMETIC Primary Gasket C9308F5 delivers OEM-level sealing performance...20111490- SKU:
- 20111490
- Availability:
- Ships Same Business Day
- Weight:
- 3.25 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY COVER
- THICKNESS:
- 1,52 MM (0,060')
- UNITS:
- 5 PACK
Now: $113.00Was: $120.50 -
On Sale
COMETIC Primary Gasket C9310F5
COMETIC
Now: $78.00Was: $83.50A primary gasket failure can compromise your entire engine's sealing integrity, leading to oil leaks, contamination, and potential catastrophic damage. The COMETIC C9310F5 Primary Gasket delivers reliable, long-lasting sealing for demanding racing and...20111491- SKU:
- 20111491
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY COVER
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- UNITS:
- 5 PACK
Now: $78.00Was: $83.50 -
On Sale
COMETIC Primary Gasket C9314F5
COMETIC
Now: $78.00Was: $83.50A primary gasket failure can leave you stranded and cost you race time—or worse, damage your engine. The COMETIC C9314F5 uses proprietary AFM (Aluminum Foamette Material) construction to deliver exceptional sealing integrity on machined surfaces without...20111492- SKU:
- 20111492
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- PRIMARY COVER
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
Now: $78.00Was: $83.50 -
On Sale
COMETIC Inspection Cover Gasket - FL C9303F5
COMETIC
Now: $24.00Was: $25.60A quality inspection cover gasket is critical for maintaining proper engine sealing and preventing oil seepage around your inspection cover. COMETIC's FL C9303F5 delivers reliable, long-lasting performance with precision engineering and American...20111493- SKU:
- 20111493
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- INSPECTION COVER
- RIDING STYLE:
- STREET
- MATERIAL:
- ALUMINUM
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
Now: $24.00Was: $25.60 -
On Sale
COMETIC Derby Gasket - AFM C9338F5
COMETIC
Now: $28.00Was: $30.20A leaking derby cover gasket compromises engine sealing and invites contamination into your top-end components. The COMETIC C9338F5 delivers reliable, leak-free performance with precision engineering that meets OEM standards for fitment and durability...20111496- SKU:
- 20111496
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 5 PACK
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- TYPE:
- DERBY COVER
Now: $28.00Was: $30.20 -
On Sale
COMETIC Head Gasket - .045" C9985-045
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A head gasket is your engine's critical seal—it's the barrier between combustion pressure and coolant passages. If it fails, you're looking at catastrophic damage. The COMETIC C9985-045 uses proven MLS (Multi-Layer Steel) construction with Load Control...09350398- SKU:
- 09350398
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- BORE SIZE:
- 3,625'
- BORE SIZE IMPERIAL:
- 3.625'
- MATERIAL:
- STEEL
- THICKNESS:
- 0,045'
- THICKNESS IMPERIAL:
- 0.045'
- TYPE:
- CYLINDER HEAD
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Head Gasket - .03" - Evo - 3.5" C9688
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A failed head gasket can mean catastrophic engine damage and costly downtime—especially on a high-compression Evo platform. The COMETIC C9688 uses multi-layer steel construction with load control embossments to distribute clamping force evenly across the...DS172086- SKU:
- DS172086
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,76 MM (0,030')
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Head Gasket - .03"- Evo - 3.625" C9690
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A head gasket is your engine's critical seal—any compromise in material or design directly impacts compression, power output, and longevity. The COMETIC C9690 uses multi-layer steel construction with load control embossments to distribute clamping force...DS172088- SKU:
- DS172088
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
- BORE SIZE IMPERIAL:
- 3.670'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER HEAD
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- BORE SIZE:
- 3,670'
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Head Gasket - .030" - 95" - Twin Cam C9721
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A properly sealed combustion chamber is non-negotiable for engine reliability and power output—especially in high-performance Twin Cam applications where heat cycling and boost pressure demand precision. The COMETIC C9721 head gasket uses multi-layer...DS172104- SKU:
- DS172104
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- BORE SIZE:
- 3,875'
- PRODUCT NAME:
- GASKET
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE IMPERIAL:
- 3.875'
- TYPE:
- CYLINDER HEAD
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
- UNITS:
- PAIR
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Head Gasket - .030" - 88" - Twin Cam C9790
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A quality head gasket is fundamental to engine reliability and performance—it's the barrier between combustion pressure and coolant passages, so compromise here means potential catastrophic failure. The COMETIC C9790 uses multi-layer steel construction...DS172106- SKU:
- DS172106
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.750'
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE:
- 3,750'
- THICKNESS:
- 0,76 MM (0,030')
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Primary Gasket C9307F5
COMETIC
Now: $113.00Was: $120.50A primary gasket failure can compromise your entire engine seal system, leading to oil weeping, air leaks, and potential catastrophic damage during high-RPM operation. The COMETIC C9307F5 delivers the reliability and durability that professional racers...20111487- SKU:
- 20111487
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MOUNTING POSITION:
- OUTER
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- THICKNESS:
- 1,52 MM (0,060')
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
Now: $113.00Was: $120.50 -
On Sale
COMETIC Starter Gasket - AFM C9312F
COMETIC
Now: $6.00Was: $6.10A failing starter gasket compromises your engine's seal integrity and can lead to costly oil leaks and starter failure. The COMETIC C9312F is engineered to deliver a reliable, long-lasting seal that withstands repeated thermal cycles and engine vibration...09350238- SKU:
- 09350238
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- THICKNESS:
- 0,032'
- TYPE:
- MOTOR
- TYPE:
- STARTER
- THICKNESS IMPERIAL:
- 0.032'
- RIDING STYLE:
- STREET
Now: $6.00Was: $6.10 -
On Sale
COMETIC Aluminum Inner Spacer Gasket C9199F5
COMETIC
Now: $100.00Was: $106.00A quality inner spacer gasket is critical to maintaining proper cylinder head sealing and preventing coolant or oil leakage in high-performance applications. The COMETIC Aluminum Inner Spacer Gasket C9199F5 delivers reliable, leak-free performance with...09350241- SKU:
- 09350241
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- PRIMARY SPACER
- MATERIAL:
- SILICONE
- MOUNTING POSITION:
- INNER
- UNITS:
- 5 PACK
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
Now: $100.00Was: $106.00 -
On Sale
COMETIC Cam Gasket Kit - M8 C10178-FP
COMETIC
MSRP: $60.85Now: $57.00Was: $60.85A cam change demands precision—using OEM-spec gaskets and seals ensures zero leakage and reliable valve timing. This complete kit eliminates the guesswork of sourcing individual components, saving you time on the bench and protecting your engine...09346316- SKU:
- 09346316
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- FEATURES:
- WITH ROCKER COVER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- CAM CHANGE
- UNITS:
- KIT
MSRP: $60.85Now: $57.00Was: $60.85Qty in Cart: 0Quantity:Price:MSRP: $60.85Now: $57.00Was: $60.85Subtotal:
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.
