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 Head Gasket - .04" - 3 13/16" C9693
COMETIC
$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...09341356- SKU:
- 09341356
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 1,02 MM (0,040')
- BORE SIZE:
- 3,8125'
- BORE SIZE IMPERIAL:
- 3.8125'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- UNITS:
- PAIR
- THICKNESS METRIC:
- 1.02 MM
$61.90 -
COMETIC Rocker Gasket - .020" C9576
COMETIC
$62.70Viton gaskets feature a stainless steel core with a .001"-thick coating of Viton rubber on both sides., Made in the U.S.A.09340750- SKU:
- 09340750
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- TYPE:
- ROCKER BOX
- THICKNESS METRIC:
- 0.51 MM
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS:
- 0,51 MM (0,020')
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
$62.70 -
COMETIC Primary Gasket C9943F5
COMETIC
$83.50COMETIC Primary Gasket09340747- SKU:
- 09340747
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY
- THICKNESS:
- 1,52 MM (0,060')
- UNITS:
- 5 PACK
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
$83.50 -
COMETIC Inspection Cover Gasket - FL C9305F5
COMETIC
$25.60Made in the U.S.A.20111494- SKU:
- 20111494
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- INSPECTION COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
$25.60 -
COMETIC Top End Gasket Twin Cam - EST C9976-030
COMETIC
$150.10EST (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...09341663- SKU:
- 09341663
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS IMPERIAL:
- 0,030'
- TYPE:
- TOP END
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- THICKNESS METRIC:
- 0.76 MM
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 0.51 MM
- MATERIAL:
- RUBBER
- UNITS:
- KIT
$150.10 -
COMETIC Head Gasket - 4.000" x .030" C10084-030
COMETIC
$59.80Center 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...09343147- SKU:
- 09343147
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BORE SIZE:
- 4,000'
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- TYPE:
- CYLINDER HEAD
$59.80 -
COMETIC Head Gasket - 4.060" x .030" C10085-030
COMETIC
$59.80Center 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...09343149- SKU:
- 09343149
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 4,060'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 4.060'
- THICKNESS IMPERIAL:
- 0,030'
$59.80 -
COMETIC Head Gasket - 4.125" x .040" C10086-040
COMETIC
$59.80Center 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...09343152- SKU:
- 09343152
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 4.125'
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,125'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,02 MM (0,040')
- UNITS:
- PAIR
$59.80 -
COMETIC Top End Gasket Kit - Buell C10111
COMETIC
$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...09344732- SKU:
- 09344732
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- TYPE:
- TOP END
- UNITS:
- KIT
$142.75 -
COMETIC Primary Gasket C9309F5
COMETIC
$120.50COMETIC Primary Gasket20111488- SKU:
- 20111488
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,52 MM (0,060')
- MOUNTING POSITION:
- OUTER
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY COVER
$120.50 -
COMETIC Primary Gasket C9145F1
COMETIC
$46.15Cometic'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%...09341205- SKU:
- 09341205
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
$46.15 -
COMETIC Exhaust Gasket - Tapered C9288
COMETIC
$38.00Gasket 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...09341337- SKU:
- 09341337
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- GRAPHITE
- RIDING STYLE:
- STREET
- MATERIAL:
- STAINLESS STEEL
- TYPE:
- EXHAUST
- UNITS:
- 10 PACK
$38.00 -
COMETIC Primary Gasket Kit C9889
COMETIC
$101.80Cometic'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%...09340744- SKU:
- 09340744
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
$101.80 -
EASTERN MOTORCYCLE PARTS Countershaft Thrust Washer - XL A-35327-SET
EASTERN MOTORCYCLE PARTS
$47.95Replacement OEM first gear thrust washersDS194184- SKU:
- DS194184
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MOUNTING POSITION:
- FIRST GEAR
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
- THICKNESS:
- 0,51 MM - 1,91 MM (0,020' - 0,075')
- THICKNESS IMPERIAL:
- 0,020' - 0,075'
- TYPE:
- COUNTERSHAFT
- PRODUCT NAME:
- THRUST WASHER
- THICKNESS METRIC:
- 0.51 MM - 1.91 MM
- UNITS:
- SET
$47.95 -
COMETIC Head Gasket - 4"- .040" C9880
COMETIC
$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...09340010- SKU:
- 09340010
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE:
- 4,000'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Head Gasket - SSW - +4.125" - .027" C9930
COMETIC
$61.90Manufactured from premium fuel-resistant materials that will not creep, crack or become brittle. Made in the U.S.A.09340031- SKU:
- 09340031
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BORE SIZE IMPERIAL:
- 4.125'
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.69 MM
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- BORE SIZE:
- 4,125'
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,69 MM (0,027')
- THICKNESS IMPERIAL:
- 0,027'
- UNITS:
- PAIR
$61.90 -
COMETIC Head Gasket SSW+4.125.030 C9931
COMETIC
$61.90Manufactured from premium fuel-resistant materials that will not creep, crack or become brittle. Made in the U.S.A.09340032- SKU:
- 09340032
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- UNITS:
- PAIR
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Head Gasket - SSW - +4.125" - .036" C9932
COMETIC
$61.90Manufactured from premium fuel-resistant materials that will not creep, crack or become brittle. Made in the U.S.A.09340033- SKU:
- 09340033
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.91 MM
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,91 MM (0,036')
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,125'
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,036'
$61.90 -
COMETIC Head Gasket - SSW - +4.125" - .040" C9933
COMETIC
$61.90Manufactured from premium fuel-resistant materials that will not creep, crack or become brittle. Made in the U.S.A.09340034- SKU:
- 09340034
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 4,125'
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- MATERIAL:
- LAYERED STEEL
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
$61.90 -
COMETIC Base Gasket - +4.125" - .020" C9936
COMETIC
$33.55High quality products for long-term reliability, Manufactured from premium fuel-resistant materials, Viton gaskets feature a stainless steel core with a .001" thick coating of Viton rubber on both sides, Made in the U.S.A.09340036- SKU:
- 09340036
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- CYLINDER BASE
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- RIDING STYLE:
- STREET
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
$33.55
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.
