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!
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- Qty in Cart
- Quantity
- Price
- Subtotal
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On Sale
COMETIC Oil Pan Gasket - M8 C10243
COMETIC
MSRP: $22.00Now: $21.00Was: $22.00High quality, application specific materials give a long and reliable life, Kit includes all necessary gaskets, seals and O-rings needed for each application, Made in the U.S.A.09346335- SKU:
- 09346335
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PAN
MSRP: $22.00Now: $21.00Was: $22.00 -
On Sale
COMETIC Trans Top Cover Gasket - M8 C10246
COMETIC
MSRP: $25.15Now: $24.00Was: $25.15High quality, application specific materials give a long and reliable life, Kit includes all necessary gaskets, seals and O-rings needed for each application, Made in the U.S.A.09346336- SKU:
- 09346336
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- TRANSMISSION TOP COVER
- UNITS:
- EACH
MSRP: $25.15Now: $24.00Was: $25.15 -
On Sale
COMETIC Breather Gasket Kit - Twin Cam C10161
COMETIC
MSRP: $20.95Now: $20.00Was: $20.95All necessary gasets/seals for a complete rebuild of the breather assembly, Includes two engine case gaskets, four Twin Cam breathers and two umbrella valve rocker covers, Made in the U.S.A.09346002- SKU:
- 09346002
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- TYPE:
- BREATHER
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $20.95Now: $20.00Was: $20.95 -
On Sale
COMETIC Primary Gasket C10211
COMETIC
MSRP: $33.55Now: $32.00Was: $33.55Cometic's proprietary AFM (Aluminum Foamette Material) gaskets feature an aluminum core with a chemically blown, compounded nitrile synthetic rubber bonded to the outside, Gaskets have resistance to temperatures of more than 2500°F, Have an 85%...09345980- SKU:
- 09345980
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- UNITS:
- EACH
MSRP: $33.55Now: $32.00Was: $33.55 -
On Sale
COMETIC Transmission Lid Gasket C10216
COMETIC
MSRP: $8.95Now: $8.00Was: $8.95Aluminum Foamette Material gaskets feature an aluminum core and a chemically blown, compounded nitrile synthetic rubber coating that is bonded to the outside layer; do not require gasket sealer., Made in the U.S.A.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'
MSRP: $8.95Now: $8.00Was: $8.95 -
On Sale
COMETIC Cylinder Head Gasket C10167-030
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90Center 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...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
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Primary Gasket Kit C9886
COMETIC
MSRP: $138.55Now: $130.00Was: $138.55Cometic's proprietary AFM (Aluminum Foamette Material) gaskets feature an aluminum core with a chemically blown, compounded nitrile synthetic rubber bonded to the outside, Gaskets have resistance to temperatures of more than 2500°F, Have an 85%...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
MSRP: $138.55Now: $130.00Was: $138.55 -
On Sale
COMETIC Primary Gasket Kit C9885
COMETIC
MSRP: $138.55Now: $130.00Was: $138.55Cometic's proprietary AFM (Aluminum Foamette Material) gaskets feature an aluminum core with a chemically blown, compounded nitrile synthetic rubber bonded to the outside, Gaskets have resistance to temperatures of more than 2500°F, Have an 85%...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
MSRP: $138.55Now: $130.00Was: $138.55 -
On Sale
COMETIC Rocker Gasket - .020" C9563
COMETIC
Now: $19.00Was: $20.10Viton gaskets feature a stainless steel core with a .001"-thick coating of Viton rubber on both sides., Made in the U.S.A.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
Now: $19.00Was: $20.10 -
On Sale
COMETIC Rocker Gasket - .020" C9561
COMETIC
Now: $16.00Was: $16.90Viton gaskets feature a stainless steel core with a .001"-thick coating of Viton rubber on both sides., Made in the U.S.A.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
Now: $16.00Was: $16.90 -
On Sale
COMETIC Rocker Gasket - Evo C9866
COMETIC
Now: $58.00Was: $61.30Viton gaskets feature a stainless steel core with a .001"-thick coating of Viton rubber on both sides., Made in the U.S.A.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
Now: $58.00Was: $61.30 -
On Sale
COMETIC Rocker Gasket Kit - XL C9954
COMETIC
MSRP: $65.05Now: $61.00Was: $65.05Premium materials used for specific applications to provide a long, service free life, Kits include all gaskets, seals, O-rings and quality bolt seals needed when servicing both rocker boxes, Made in the U.S.A.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
MSRP: $65.05Now: $61.00Was: $65.05 -
On Sale
COMETIC Rocker Gasket - .020" C9986
COMETIC
MSRP: $30.40Now: $29.00Was: $30.40Viton gaskets feature a stainless steel core with a .001"-thick coating of Viton rubber on both sides., Made in the U.S.A.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
MSRP: $30.40Now: $29.00Was: $30.40 -
On Sale
COMETIC Inspection Cover Gasket - FX C9331F5
COMETIC
Now: $17.00Was: $18.40Made in the U.S.A.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')
Now: $17.00Was: $18.40 -
On Sale
COMETIC Top End Gasket - Big Bore - Big Twin - EST C9767
COMETIC
MSRP: $176.35Now: $166.00Was: $176.35EST (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...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
MSRP: $176.35Now: $166.00Was: $176.35 -
On Sale
COMETIC Top End Gasket - Big Twin - EST C9635
COMETIC
MSRP: $142.75Now: $134.00Was: $142.75EST (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...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
MSRP: $142.75Now: $134.00Was: $142.75 -
On Sale
COMETIC Top End Gasket - Big Twin - EST C9747
COMETIC
MSRP: $142.75Now: $134.00Was: $142.75EST (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...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
MSRP: $142.75Now: $134.00Was: $142.75 -
On Sale
COMETIC Top End Gasket Kit - Twin Cam 88 - EST C9779
COMETIC
MSRP: $183.70Now: $173.00Was: $183.70EST (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...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
MSRP: $183.70Now: $173.00Was: $183.70 -
On Sale
COMETIC Engine Gasket Kit - 110" C10157
COMETIC
MSRP: $287.65Now: $270.00Was: $287.65Every 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,...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
MSRP: $287.65Now: $270.00Was: $287.65 -
On Sale
COMETIC Engine Gasket Kit - 110" C10157-030
COMETIC
MSRP: $287.65Now: $270.00Was: $287.65Every 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,...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
MSRP: $287.65Now: $270.00Was: $287.65
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.
