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
-
JAMES GASKET Lower Rocker Cover Gasket - Big Twin 17355-92
JAMES GASKET
$42.80A reliable rocker cover gasket is critical to preventing oil seepage and maintaining engine integrity on your Big Twin. The JAMES GASKET Lower Rocker Cover Gasket combines proven elastomer sealing technology with precision engineering to deliver a...DS174423- SKU:
- DS174423
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- MATERIAL:
- RUBBER
$42.80 -
JAMES GASKET Cam Cover Gasket - Knucklehead EL 25225-36-A
JAMES GASKET
$29.10Cam chest leaks compromise engine sealing and can lead to oil loss, contamination, and potential engine damage over time. The JAMES GASKET Cam Cover Gasket delivers reliable, long-lasting sealing for your Knucklehead EL engine, restoring a proper seal...DS174422- SKU:
- DS174422
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- THICKNESS:
- 0,51 MM (0,020')
- PRODUCT NAME:
- GASKET
- TYPE:
- CAM COVER
- UNITS:
- 10 PACK
$29.10 -
JAMES GASKET Rear Cylinder Base Gasket - Big Twin 16777-48
JAMES GASKET
$16.60A leaking rear cylinder base gasket compromises engine sealing and can lead to costly oil weeping and potential internal damage. The JAMES GASKET Rear Cylinder Base Gasket eliminates guesswork with a precision-engineered design that seats reliably...DS174420- SKU:
- DS174420
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,032'
- THICKNESS METRIC:
- 0.81 MM
$16.60 -
JAMES GASKET Rubber Upper Rocker Cover Gasket - Big Twin 17356-92
JAMES GASKET
$42.80A faulty rocker cover gasket compromises engine sealing and invites oil leaks that can damage your engine bay and cost you race time. The JAMES GASKET rubber upper rocker cover gasket eliminates guesswork with precision engineering—a steel core...DS174419- SKU:
- DS174419
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- PRODUCT NAME:
- GASKET
- MOUNTING POSITION:
- UPPER
- UNITS:
- 5 PACK
- MATERIAL:
- RUBBER
$42.80 -
JAMES GASKET Rocker Cover Gasket 17539-38
JAMES GASKET
$14.11A quality rocker cover gasket is the first line of defense against oil seepage and contamination of your combustion chamber. The JAMES GASKET 17539-38 eliminates the guesswork with a precision-engineered design that seals reliably across thermal cycles...DS174417- SKU:
- DS174417
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
- MOUNTING POSITION:
- FRONT
$14.11 -
JAMES GASKET Rocker Cover Gasket 17537-38
JAMES GASKET
$16.60A failing rocker cover gasket is an open invitation to oil seepage and potential engine contamination—two problems that compound quickly if left unaddressed. The JAMES GASKET 17537-38 delivers a proven seal with strategically engineered elastomer beading...DS174416- SKU:
- DS174416
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- TYPE:
- INTAKE
- TYPE:
- ROCKER COVER
- MOUNTING POSITION:
- REAR
- UNITS:
- 10 PACK
$16.60Qty in Cart: 0Quantity:Price:$16.60Subtotal: -
JAMES GASKET Rocker Cover Gasket 17535-38
JAMES GASKET
$14.70A compromised rocker cover gasket means oil seepage, potential engine bay contamination, and the risk of oil starvation if leakage goes unaddressed. The JAMES GASKET 17535-38 delivers a reliable, long-lasting seal using domestic manufacturing and proven...DS174415- SKU:
- DS174415
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- FRONT
- MOUNTING POSITION:
- REAR
- TYPE:
- EXHAUST
- TYPE:
- INTAKE
- UNITS:
- 10 PACK
$14.70 -
JAMES GASKET Rubber Inner Rocker Cover Gasket 17358-84-A
JAMES GASKET
$20.30A leaking rocker cover gasket compromises engine bay cleanliness and can lead to oil contamination in critical areas. The JAMES GASKET Rubber Inner Rocker Cover Gasket delivers a reliable, long-lasting seal using proven elastomer technology and precision...DS174413- SKU:
- DS174413
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- RUBBER
- MOUNTING POSITION:
- INNER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- UNITS:
- 10 PACK
$20.30 -
JAMES GASKET Upper Rocker Cover Gasket Rubber 17356-84-A
JAMES GASKET
$42.80A leaking rocker cover gasket turns a simple maintenance task into an oil-soaked headache. The JAMES GASKET Upper Rocker Cover Gasket delivers a reliable, long-lasting seal that handles engine heat and vibration without compromising on easy installation...DS174412- SKU:
- DS174412
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- RUBBER
- MOUNTING POSITION:
- UPPER
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$42.80 -
JAMES GASKET Lower Rocker Cover Rubber - Big Twin 17355-84-A
JAMES GASKET
$42.80A worn or failing rocker cover gasket leads to oil seepage, engine bay mess, and potential internal damage if contaminants enter the crankcase. The JAMES GASKET Lower Rocker Cover Rubber delivers a reliable, long-lasting seal using dual elastomer coating...DS174411- SKU:
- DS174411
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- RUBBER
- UNITS:
- 5 PACK
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER BOX
$42.80 -
JAMES GASKET Front Cylinder Base Gasket - Big Twin 16776-48
JAMES GASKET
$16.60A properly sealed cylinder base is non-negotiable for engine reliability—especially under high-load conditions where blow-by and oil weeping become costly problems. The JAMES GASKET Front Cylinder Base Gasket eliminates guesswork with a...DS174410- SKU:
- DS174410
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CYLINDER BASE
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,032'
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
$16.60 -
JAMES GASKET Base Gasket - 3-5/8" - Big Twin 16777-66-S
JAMES GASKET
$24.50A properly sealed engine base is non-negotiable for reliable Big Twin performance, and gasket failure leads to oil leakage, contamination, and potential engine damage. The JAMES GASKET Base Gasket eliminates guesswork with a precision-engineered design...DS174409- SKU:
- DS174409
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BORE SIZE IMPERIAL:
- 3.625'
- TYPE:
- CYLINDER BASE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- 10 PACK
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- STREET
$24.50 -
JAMES GASKET Front Base Gasket - FL/FX 16776-63
JAMES GASKET
$16.60A properly sealed engine base is fundamental to maintaining oil pressure and preventing leaks that compromise performance and engine longevity. The JAMES GASKET Front Base Gasket eliminates guesswork with a precision-fit design engineered for FL/FX...DS174408- SKU:
- DS174408
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- THICKNESS METRIC:
- 0.81 MM
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,032'
- TYPE:
- CYLINDER BASE
$16.60 -
JAMES GASKET Front/Rear Base Gasket - EL 16774-21
JAMES GASKET
$16.60A quality base gasket is fundamental to maintaining proper crankcase sealing and preventing oil leakage at critical engine interfaces. The JAMES GASKET Front/Rear Base Gasket eliminates the guesswork with a precision-engineered design that seats reliably...DS174405- SKU:
- DS174405
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- THICKNESS IMPERIAL:
- 0,031'
- UNITS:
- 10 PACK
- TYPE:
- CYLINDER BASE
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- PRODUCT NAME:
- GASKET
$16.60 -
JAMES GASKET Head Gasket - Big Twin 16773-85-T
JAMES GASKET
$59.20A head gasket failure can sideline your Big Twin engine and cost thousands in machine work. The JAMES GASKET Head Gasket delivers reliable sealing under extreme cylinder pressures and temperature cycling, keeping combustion contained where it belongs...DS174404- SKU:
- DS174404
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- DISPLACEMENT:
- 1200 CC
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,045'
- THICKNESS METRIC:
- 1.14 MM
- MATERIAL:
- TEFLON
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,14 MM (0,045')
- UNITS:
- 5 PACK
- DISPLACEMENT:
- 1340 CC
- TYPE:
- CYLINDER HEAD
$59.20 -
JAMES GASKET Big Bore Gasket Set - Big Twin 16770-86-S
JAMES GASKET
$49.95A proper gasket set is the foundation of any reliable big twin engine—factory seals degrade over time, leading to oil weeps, compression loss, and potential catastrophic failure. The JAMES GASKET Big Bore Gasket Set ensures you're sealing critical...DS174403- SKU:
- DS174403
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD BORE
- BORE SIZE IMPERIAL:
- 3.625'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- TYPE:
- CYLINDER HEAD
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- MATERIAL:
- TEFLON
$49.95 -
JAMES GASKET Fire Ring Head Gasket - Panhead 16770-48-X
JAMES GASKET
$48.95A proper head gasket seal is fundamental to engine reliability, and the JAMES GASKET Fire Ring Head Gasket delivers the durability Panhead engines demand. This U.S.-manufactured gasket uses a fire ring design to maintain consistent compression and...DS174402- SKU:
- DS174402
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,045'
- PRODUCT NAME:
- GASKET
- FEATURES:
- FIRE RING
- THICKNESS:
- 1,14 MM (0,045')
- THICKNESS METRIC:
- 1.14 MM
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
$48.95 -
JAMES GASKET Lower Neoprene Rocker Cover Gasket 17353-89
JAMES GASKET
$35.80A compromised rocker cover gasket doesn't just leak—it exposes your engine to contamination and oil loss that can degrade performance and damage internal components. The JAMES GASKET Lower Neoprene Rocker Cover Gasket uses a dual-elastomer design with...DS174389- SKU:
- DS174389
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- MATERIAL:
- NEOPRENE
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$35.80 -
JAMES GASKET Upper Neoprene Rocker Cover Gasket - XL 17354-89
JAMES GASKET
$35.10A failing rocker cover gasket means oil seepage, engine bay mess, and potential internal contamination—none of which you want. The JAMES GASKET Upper Neoprene Rocker Cover Gasket delivers a lasting, reliable seal with U.S.A.-made construction and...DS174388- SKU:
- DS174388
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- NEOPRENE
- MOUNTING POSITION:
- UPPER
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$35.10 -
JAMES GASKET Cam Cover Gasket - Big Twin 25225-93
JAMES GASKET
$35.95Cam cover gaskets are critical sealing components that prevent oil leakage from your engine's valve train area—a common failure point that can lead to messy leaks and potential engine damage if ignored. A worn or deteriorated gasket compromises the seal...DS174386- SKU:
- DS174386
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 1340 CC
- PRODUCT NAME:
- GASKET
- TYPE:
- CAM COVER
- UNITS:
- 10 PACK
$35.95
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.
