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 Head Gasket - .043" C9239
COMETIC
MSRP: $56.65Now: $53.00Was: $56.65A head gasket failure can mean catastrophic engine damage—and the COMETIC C9239 is engineered to prevent that. This multi-layer steel gasket distributes clamping load evenly across the sealing surface, reducing bore distortion and maximizing piston ring...09350397- SKU:
- 09350397
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- CFM
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.043'
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,043'
- TYPE:
- CYLINDER HEAD
MSRP: $56.65Now: $53.00Was: $56.65 -
On Sale
COMETIC Top End Gasket Kit - 95" - Twin Cam - EST C9780
COMETIC
MSRP: $181.60Now: $171.00Was: $181.60Top-end gasket failure is one of the most expensive problems in engine rebuilding—and it's entirely preventable with the right sealing technology. The COMETIC EST C9780 eliminates hot spots that lead to premature failure by actively drawing heat away...DS172085- SKU:
- DS172085
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- BORE SIZE IMPERIAL:
- 3.875'
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- BORE SIZE:
- 3,875'
- MATERIAL:
- STAINLESS STEEL
- DISPLACEMENT:
- 95'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
MSRP: $181.60Now: $171.00Was: $181.60 -
On Sale
COMETIC Head Gasket -.04"- Evo - 3.625" C9691
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A quality head gasket is foundational to engine reliability—especially in high-boost Evo applications where combustion pressures and thermal cycling demand precision sealing. The COMETIC C9691 uses Multi-Layer Steel (MLS) construction with Load Control...DS172089- SKU:
- DS172089
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.670'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 3,670'
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Head Gasket - .040 - 88" - Twin Cam C9745
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A compromised head gasket will rob your Twin Cam engine of compression, power, and reliability. The COMETIC C9745 uses multi-layer steel construction with load control embossments to maintain even pressure across the sealing surface, reducing bore...DS172107- SKU:
- DS172107
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE IMPERIAL:
- 3.750'
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,040'
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 3,750'
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Oil Pump Gasket - AFM C9399F
COMETIC
Now: $7.00Was: $7.40A failing oil pump gasket can cause catastrophic oil leaks and pressure loss, compromising engine protection and reliability during high-stress racing conditions. The COMETIC Oil Pump Gasket AFM C9399F delivers factory-spec sealing performance with...09350236- SKU:
- 09350236
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- STREET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- THICKNESS:
- 0,032'
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.032'
Now: $7.00Was: $7.40Qty in Cart: 0Quantity:Price:Now: $7.00Was: $7.40Subtotal: -
On Sale
COMETIC Oil Pump Gasket - AFM C9315F
COMETIC
Now: $6.00Was: $6.40A failing oil pump gasket compromises your engine's lubrication system, risking catastrophic bearing wear and seizure. The COMETIC Oil Pump Gasket AFM C9315F delivers the precision seal your high-performance engine demands, engineered to withstand...09350237- SKU:
- 09350237
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- THICKNESS IMPERIAL:
- 0.032'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,032'
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
Now: $6.00Was: $6.40 -
On Sale
COMETIC Top End Gasket Kit - Twin Cooled - .030" C10138-030
COMETIC
MSRP: $183.70Now: $173.00Was: $183.70A top-end gasket failure can sideline your engine and tank a season. The COMETIC C10138-030 uses Extreme Sealing Technology with embossed stainless steel and proprietary rubber material to eliminate hot spots and ensure even heat dissipation across the...09344837- SKU:
- 09344837
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE:
- 4,000'
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 4.000'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,030'
- DISPLACEMENT:
- 110'
- THICKNESS METRIC:
- 0.76 MM
- MATERIAL:
- RUBBER
- MATERIAL:
- VITON
- UNITS:
- KIT
MSRP: $183.70Now: $173.00Was: $183.70 -
On Sale
COMETIC Top End Gasket Kit - Twin Cam C9949-030
COMETIC
MSRP: $146.95Now: $138.00Was: $146.95A top-end gasket failure can sideline your build and compromise engine integrity. The COMETIC C9949-030 uses Extreme Sealing Technology with embossed stainless steel construction to eliminate hot spots and ensure consistent sealing across all critical...09344840- SKU:
- 09344840
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE:
- 4,000'
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS IMPERIAL:
- 0,030'
- DISPLACEMENT:
- 110'
- THICKNESS METRIC:
- 0.76 MM
- UNITS:
- KIT
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
MSRP: $146.95Now: $138.00Was: $146.95 -
On Sale
COMETIC Primary Gasket C10145F5
COMETIC
MSRP: $141.70Now: $133.00Was: $141.70A primary gasket is critical to maintaining a reliable seal between your engine's primary cover and crankcase—any failure here leads to oil leakage, contamination, and potential drivetrain damage. COMETIC's C10145F5 is engineered for high-performance...09345061- SKU:
- 09345061
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- THICKNESS IMPERIAL:
- 0.060'
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- PRIMARY COVER
- UNITS:
- 5 PACK
- MOUNTING POSITION:
- OUTER
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
MSRP: $141.70Now: $133.00Was: $141.70Qty in Cart: 0Quantity:Price:MSRP: $141.70Now: $133.00Was: $141.70Subtotal: -
COMETIC Clutch Cover Gasket C10147F1
COMETIC
$10.95A failing clutch cover gasket can lead to oil seepage, contaminated friction surfaces, and premature clutch wear—costly problems that compromise both performance and reliability. The COMETIC C10147F1 eliminates these issues with a purpose-built AFM...09345064- SKU:
- 09345064
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- MODEL:
- HI-PERFORMANCE
$10.95 -
COMETIC Clutch Cover Gasket C10147F5
COMETIC
$37.75A failing clutch cover gasket compromises engine integrity and invites costly oil seepage into your transmission. The COMETIC C10147F5 eliminates this vulnerability with a chemically bonded AFM material that maintains a rock-solid seal under sustained...09345065- SKU:
- 09345065
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- TYPE:
- CLUTCH COVER
- THICKNESS IMPERIAL:
- 0.060'
$37.75 -
COMETIC Primary Gasket Kit C10148
COMETIC
$56.65A primary gasket kit failure can sideline your engine and cost you race time or project momentum. Cometic's AFM gasket material eliminates the guesswork—delivering consistent seal integrity across extreme temperature swings without requiring additional...09345066- SKU:
- 09345066
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- TYPE:
- PRIMARY
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$56.65Qty in Cart: 0Quantity:Price:$56.65Subtotal: -
COMETIC Inspection Cover Gasket C10152F1
COMETIC
$11.95A leaking inspection cover gasket compromises engine sealing integrity and can lead to oil seepage that damages surrounding components. The COMETIC C10152F1 provides the precision fit and material durability needed to maintain a reliable, leak-free seal...09345070- SKU:
- 09345070
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- INSPECTION COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- EACH
$11.95 -
COMETIC Breather Gasket - Big Twin C10114
COMETIC
$12.00A failing rocker box breather gasket compromises your engine's ability to manage crankcase pressure, leading to oil leaks, contaminated air intake, and potential engine damage. The COMETIC Breather Gasket C10114 is a precision-engineered replacement that...09344735- SKU:
- 09344735
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- BREATHER
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
$12.00 -
COMETIC Push Rod Gasket Set C10068
COMETIC
$14.95A properly sealed push rod gallery is critical to maintaining oil pressure and preventing leakage in high-performance engines. The COMETIC Push Rod Gasket Set C10068 provides precision sealing where factory gaskets often fail under sustained boost or...09344652- SKU:
- 09344652
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- PUSHROD COVER
- UNITS:
- KIT
$14.95 -
COMETIC Rocker Cover Gasket - Big Twin C9336-2
COMETIC
$6.95A failing rocker cover gasket compromises engine sealing and invites oil leakage that accelerates wear on critical components. The COMETIC C9336-2 delivers reliable containment with a precision-engineered Viton-stainless steel construction designed to...09344684- SKU:
- 09344684
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER BASE
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- THICKNESS IMPERIAL:
- 0,031'
- MATERIAL:
- FIBER
- THICKNESS:
- 0,79 MM (0,031')
$6.95 -
COMETIC Primary Cover Gasket C9703F1
COMETIC
$24.10A primary cover gasket failure can quickly sideline your bike and compromise engine sealing integrity. Cometic's AFM material delivers superior shape recovery and torque retention on machined surfaces, eliminating the need for additional gasket sealer...09344722- SKU:
- 09344722
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- THICKNESS IMPERIAL:
- 0,031'
- UNITS:
- EACH
- MATERIAL:
- FIBER
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,79 MM (0,031')
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- TYPE:
- PRIMARY
$24.10 -
COMETIC Transmission/Engine Case Gasket C9190F5
COMETIC
$65.00Transmission and engine case gasket integrity is critical to preventing fluid leakage, contamination, and catastrophic failure during high-performance driving. The COMETIC C9190F5 delivers the seal reliability you need for consistent power delivery and...09342019- SKU:
- 09342019
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- TYPE:
- TRANSMISSION
$65.00 -
COMETIC Shift Shaft Tube Gasket C9005
COMETIC
$8.30A reliable shift shaft tube gasket is critical to maintaining transmission integrity and preventing fluid leakage under racing conditions. The COMETIC C9005 delivers the durability and precision fit required for high-performance applications where...09342020- SKU:
- 09342020
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- 10 PACK
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- PRIMARY SPACER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
- MATERIAL:
- STEEL
- THICKNESS:
- 1,52 MM (0,060')
$8.30 -
COMETIC Gasket C9197F5
COMETIC
$8.70Engine gaskets are the unsung heroes of a reliable engine build—they seal critical surfaces and prevent fluid leakage under extreme pressures and temperatures. The COMETIC C9197F5 Viton gasket delivers the durability and precision fit you need for forced...09343176- SKU:
- 09343176
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- SILICONE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- TYPE:
- ROCKER COVER
$8.70
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.
