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 Base Gasket - 4" - .010" C9937
COMETIC
$33.55Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes, MLS (Multi-Layer Steel) head gaskets promote an even torque load across the gasket...09340777- SKU:
- 09340777
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.25 MM
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 4.000'
- STYLE:
- STANDARD
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- MATERIAL:
- STEEL
- TYPE:
- CYLINDER BASE
$33.55Qty in Cart: 0Quantity:Price:$33.55Subtotal: -
COMETIC Base Gasket - Evo - .010" C9101
COMETIC
$33.55Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes, MLS (Multi-Layer Steel) head gaskets promote an even torque load across the gasket...09340773- SKU:
- 09340773
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.25 MM
- TYPE:
- CYLINDER BASE
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD
- UNITS:
- PAIR
$33.55 -
COMETIC Base Gasket - .010" - XL C9100
COMETIC
$33.55Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes, MLS (Multi-Layer Steel) head gaskets promote an even torque load across the gasket...09340772- SKU:
- 09340772
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.25 MM
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD
$33.55 -
JAMES GASKET Oil Pump Crank Gasket - CSE XL 26256-52
JAMES GASKET
$14.00JAMES GASKET Oil Pump Crank Gasket - CSE XLDS174880- SKU:
- DS174880
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- STYLE:
- BODY TO CRANKCASE
$14.00Qty in Cart: 0Quantity:Price:$14.00Subtotal: -
COMETIC Complete Gasket Kit - .030" - 4/5 Speed C9847F
COMETIC
$356.95Every gasket in these kits uses the best materials possible for its intended application, Multi-Layer Steel (MLS) head gaskets, Steel Viton®-coated base gaskets, Blue Viton valve stem seals, Aluminum Foam Material (AFM) race-style exhaust gaskets,...09340801- SKU:
- 09340801
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
$356.95Qty in Cart: 0Quantity:Price:$356.95Subtotal: -
COMETIC Complete Gasket Kit - .030" C9848F
COMETIC
$356.95Every gasket in these kits uses the best materials possible for its intended application, Multi-Layer Steel (MLS) head gaskets, Steel Viton®-coated base gaskets, Blue Viton valve stem seals, Aluminum Foam Material (AFM) race-style exhaust gaskets,...09340802- SKU:
- 09340802
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,030'
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- COMPLETE
- BORE SIZE:
- 3,500'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE IMPERIAL:
- 3.500'
- UNITS:
- KIT
$356.95Qty in Cart: 0Quantity:Price:$356.95Subtotal: -
COMETIC Head Gasket - .060 - MLS Evo C9180
COMETIC
$90.25Center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements, Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load...09341227- SKU:
- 09341227
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- BORE SIZE:
- 3,750'
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- BORE SIZE IMPERIAL:
- 3.750'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
$90.25Qty in Cart: 0Quantity:Price:$90.25Subtotal: -
COMETIC Derby Cover Gasket - 3 Hole C9183F5
COMETIC
$21.30Derby cover gasket for Harley Davidson models09341228- SKU:
- 09341228
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- CLUTCH COVER
- TYPE:
- DERBY COVER
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
$21.30 -
COMETIC Output Gear Seal C9200F1
COMETIC
$11.95Seals for Twin Cam Transmission Output09346322- SKU:
- 09346322
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- TYPE:
- OUTPUT GEAR
- UNITS:
- EACH
- RIDING STYLE:
- STREET
$11.95 -
COMETIC Top End Gasket Kit - M8 C10219
COMETIC
$240.40EST (Extreme Sealing Technology) gasket kits include embossed stainless steel head, base and rocker gaskets covered with a proprietary rubber material, Head gasket material allows heat to be drawn away from the combustion ring and dissipated evenly...09346324- SKU:
- 09346324
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- BORE SIZE:
- 4,075'
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 4.075'
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$240.40 -
COMETIC Cylinder Base Gasket C9568-1
COMETIC
$4.95Center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements, Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load...09344712- SKU:
- 09344712
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,031'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- MATERIAL:
- FIBER
- THICKNESS METRIC:
- 0.79 MM
- UNITS:
- EACH
$4.95Qty in Cart: 0Quantity:Price:$4.95Subtotal: -
COMETIC Rocker Cover Gasket C9602-2
COMETIC
$5.95Viton gaskets feature a stainless steel core with a .001"-thick coating of Viton rubber on both sides., Made in the U.S.A.09344714- SKU:
- 09344714
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- MATERIAL:
- FIBER
- TYPE:
- ROCKER COVER
- UNITS:
- PAIR
$5.95Qty in Cart: 0Quantity:Price:$5.95Subtotal: -
EASTERN MOTORCYCLE PARTS Steel Breather Valve Washer Kit - Big Twin A-25302-SET
EASTERN MOTORCYCLE PARTS
$31.95Includes one each of the following size washers: .110", .115", .120",.125",.130",.135",.140" and .145" (.313" i.d. hole), Made in the U.S.A.DS194159- SKU:
- DS194159
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- WASHER
- UNITS:
- SET
- RIDING STYLE:
- STREET
- TYPE:
- BREATHER
$31.95Qty in Cart: 0Quantity:Price:$31.95Subtotal: -
REVOLUTION PERFORMANCE, LLC Gasket Kit - M8 RP10181HB030014
REVOLUTION PERFORMANCE, LLC
$89.95Made in the U.S.A.09347159- SKU:
- 09347159
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$89.95Qty in Cart: 0Quantity:Price:$89.95Subtotal: -
COMETIC Top End Gasket - 4" - S&S C9917
COMETIC
$142.75EST gasket kits include embossed stainless steel head, base and rocker gaskets covered with a proprietary rubber material. Material allows heat to be drawn away from the combustion ring and dissipated evenly across the gasket surface to eliminate hot...09340767- SKU:
- 09340767
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- BORE SIZE:
- 4,000'
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
$142.75Qty in Cart: 0Quantity:Price:$142.75Subtotal: -
On Sale
S&S CYCLE Lower End Gasket Kit 31-2067
S&S CYCLE
MSRP: $52.95Now: $45.86Was: $52.95Contain the best quality gaskets available, Made in the U.S.A.312067- SKU:
- 312067
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- LOWER END
MSRP: $52.95Now: $45.86Was: $52.95 -
S&S CYCLE Gaskets - 4" - .045 - STL 900-0822
S&S CYCLE
$91.95Head gaskets are made from aramid fiber-reinforced premium graphite material with a steel core, stainless steel fire ring and anti-stick coating, Made in the U.S.A.09346418- SKU:
- 09346418
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,14 MM (0,045')
- THICKNESS IMPERIAL:
- 0.045'
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4'
- PRODUCT NAME:
- GASKET
- BORE SIZE IMPERIAL:
- 4'
- MATERIAL:
- LAYERED STEEL
- THICKNESS METRIC:
- 1.14 MM
$91.95Qty in Cart: 0Quantity:Price:$91.95Subtotal:
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.
