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 Lower Rocker Cover Rubber Gasket C9280
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.09350224- SKU:
- 09350224
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- VITON
- UNITS:
- 5 PACK
- MOUNTING POSITION:
- LOWER
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
Now: $19.00Was: $20.10 -
On Sale
COMETIC Head Gasket - Big Twin C10120
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...09344739- SKU:
- 09344739
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE:
- 3,875'
- MATERIAL:
- LAYERED STEEL
- BORE SIZE IMPERIAL:
- 3.875'
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 1,02 MM (0,040')
- UNITS:
- PAIR
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Complete Gasket Kit - Big Twin C10121
COMETIC
MSRP: $169.00Now: $159.00Was: $169.00Every 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, Made...09344740- SKU:
- 09344740
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- TYPE:
- MOTOR
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
MSRP: $169.00Now: $159.00Was: $169.00Qty in Cart: 0Quantity:Price:MSRP: $169.00Now: $159.00Was: $169.00Subtotal: -
On Sale
COMETIC Complete Gasket Kit - Big Twin C10121-036
COMETIC
MSRP: $169.00Now: $159.00Was: $169.00Every 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, Made...09344741- SKU:
- 09344741
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE SIZE:
- 4,125'
- TYPE:
- MOTOR
- UNITS:
- KIT
- MATERIAL:
- STEEL
- THICKNESS IMPERIAL:
- 0,036'
- BORE SIZE IMPERIAL:
- 4.125'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 0.91 MM
- RIDING STYLE:
- STREET
MSRP: $169.00Now: $159.00Was: $169.00Qty in Cart: 0Quantity:Price:MSRP: $169.00Now: $159.00Was: $169.00Subtotal: -
On Sale
COMETIC Head Gasket C10037
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...09344650- SKU:
- 09344650
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,8125'
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 3.8125'
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
- MATERIAL:
- LAYERED STEEL
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Cylinder Base Gasket C10038
COMETIC
MSRP: $33.55Now: $32.00Was: $33.55Cylinder base gasket for Sportster models09344651- SKU:
- 09344651
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE IMPERIAL:
- 3.8125'
- THICKNESS IMPERIAL:
- 0,020'
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,51 MM (0,020')
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.51 MM
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
MSRP: $33.55Now: $32.00Was: $33.55 -
On Sale
COMETIC Top End Gasket - XL1200 C9219
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...09341664- SKU:
- 09341664
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- DISPLACEMENT:
- 1200 CC
- MATERIAL:
- RUBBER
- TYPE:
- TOP END
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE:
- 3,8125'
- BORE SIZE IMPERIAL:
- 3.8125'
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
MSRP: $142.75Now: $134.00Was: $142.75 -
On Sale
COMETIC Breather Gasket - Twin Cam C9579
COMETIC
Now: $8.00Was: $8.20Replacement breather cover gasket for Twin Cam models09341332- SKU:
- 09341332
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,79 MM (0,031')
- THICKNESS METRIC:
- 0.79 MM
- MATERIAL:
- FIBER
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- THICKNESS IMPERIAL:
- 0,031'
- TYPE:
- BREATHER
Now: $8.00Was: $8.20Qty in Cart: 0Quantity:Price:Now: $8.00Was: $8.20Subtotal: -
On Sale
COMETIC Breather Filter - Twin Cam C9679
COMETIC
Now: $11.00Was: $12.00Replacement breather filter element., Made in the U.S.A.09341333- SKU:
- 09341333
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- FOAM
- TYPE:
- BREATHER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
Now: $11.00Was: $12.00Qty in Cart: 0Quantity:Price:Now: $11.00Was: $12.00Subtotal: -
On Sale
COMETIC Breather Baffle Gasket C9580
COMETIC
Now: $8.00Was: $8.20Replacement breather baffle gasket for Twin Cam models09341334- SKU:
- 09341334
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- MATERIAL:
- FIBER
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,79 MM (0,031')
- UNITS:
- 10 PACK
- THICKNESS IMPERIAL:
- 0,031'
- TYPE:
- BREATHER
Now: $8.00Was: $8.20 -
On Sale
COMETIC Lifter Cover Gasket - Twin Cam C9578F
COMETIC
Now: $5.00Was: $5.40Made in the U.S.A.09341335- SKU:
- 09341335
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MOUNTING POSITION:
- FRONT
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.032'
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- TAPPET BLOCK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- UNITS:
- 10 PACK
Now: $5.00Was: $5.40 -
On Sale
COMETIC Exhaust Gasket - Race C9719
COMETIC
Now: $30.00Was: $32.10Gasket material and construction will vary by application to ensure longevity with leak free performance under all conditions, 4-stroke applications utilize a double-sided Viton® rubber-coated stainless steel gasket providing precise, high-temperature...09341336- SKU:
- 09341336
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- MATERIAL:
- GRAPHITE
- TYPE:
- EXHAUST
- UNITS:
- 10 PACK
Now: $30.00Was: $32.10 -
On Sale
COMETIC Oil Pan Gasket - Dyna C9646F
COMETIC
Now: $69.00Was: $73.30Aluminum 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.09341338- SKU:
- 09341338
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- UNITS:
- 10 PACK
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- OIL PAN
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
Now: $69.00Was: $73.30 -
On Sale
COMETIC Oil Pan Gasket - FLT C9647F
COMETIC
Now: $69.00Was: $73.30Aluminum 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.09341339- SKU:
- 09341339
- Availability:
- Ships Same Business Day
- Weight:
- 0.54 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- TYPE:
- OIL PAN
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- TRANSMISSION
Now: $69.00Was: $73.30 -
On Sale
COMETIC Primary Gasket C9179F5
COMETIC
Now: $113.00Was: $120.50COMETIC Primary Gasket09341340- SKU:
- 09341340
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- THICKNESS:
- 1,52 MM (0,060')
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- PRIMARY
- UNITS:
- 5 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- OUTER
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
Now: $113.00Was: $120.50 -
On Sale
COMETIC Oil Change Gasket Kit C10156
COMETIC
MSRP: $14.95Now: $14.00Was: $14.95Cometic'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%...09345073- SKU:
- 09345073
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
MSRP: $14.95Now: $14.00Was: $14.95 -
On Sale
COMETIC Clutch Release Cover Gasket C9526F
COMETIC
Now: $13.00Was: $13.90Aluminum 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.09341384- SKU:
- 09341384
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- UNITS:
- 10 PACK
- TYPE:
- CLUTCH RELEASE COVER
Now: $13.00Was: $13.90 -
On Sale
COMETIC Head Gasket - 4.125" - .030" C9910
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...09340789- SKU:
- 09340789
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,76 MM (0,030')
- BORE SIZE:
- 4,125'
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,030'
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 4.125'
- THICKNESS METRIC:
- 0.76 MM
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Derby Cover Gasket - Twin Cam C9997F5
COMETIC
Now: $20.00Was: $21.30Derby cover gasket for Harley Davidson models09340788- SKU:
- 09340788
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- THICKNESS:
- 1,52 MM (0,060')
- THICKNESS IMPERIAL:
- 0.060'
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- DERBY COVER
Now: $20.00Was: $21.30 -
On Sale
COMETIC Foot Peg Stud Gasket C9401
COMETIC
Now: $10.00Was: $10.20Made in the U.S.A.09350233- SKU:
- 09350233
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,025'
- THICKNESS IMPERIAL:
- 0.025'
- MATERIAL:
- VULCANIZED
- TYPE:
- SHIFTER STUD BOSS
- UNITS:
- 10 PACK
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- GASKET
Now: $10.00Was: $10.20
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.
