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
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JAMES GASKET Primary Gasket Kit 34901-85-K
JAMES GASKET
$67.95A leaking primary gasket compromises engine sealing and invites oil contamination into critical engine areas. This JAMES GASKET kit delivers OEM-specification reliability with enhanced silicone beading, ensuring a tight seal that holds up through...DS174953- SKU:
- DS174953
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- FEATURES:
- BEADED
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,062'
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- SILICONE
- TYPE:
- PRIMARY COVER
- UNITS:
- KIT
- MATERIAL:
- PAPER
- THICKNESS METRIC:
- 1.60 MM
$67.95 -
JAMES GASKET Primary Gasket Kit 34901-94-K
JAMES GASKET
$75.95A properly sealed primary gasket is critical to preventing oil leakage and maintaining consistent engine performance under racing conditions. The JAMES GASKET Primary Gasket Kit delivers OEM-equivalent sealing with silicone beading technology, ensuring...DS174952- SKU:
- DS174952
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- PRIMARY COVER
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- FEATURES:
- BEADED
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- MATERIAL:
- SILICONE
$75.95 -
JAMES GASKET Primary Gasket Kit 60539-89-KX
JAMES GASKET
$96.95A primary gasket failure can compromise your entire engine assembly, leading to oil weeping, reduced compression, and costly downtime. The JAMES GASKET Primary Gasket Kit 60539-89-KX delivers OEM-spec sealing with silicone beading technology that handles...DS174951- SKU:
- DS174951
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- FEATURES:
- BEADED
- MATERIAL:
- SILICONE
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- TYPE:
- PRIMARY COVER
- UNITS:
- KIT
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
$96.95 -
JAMES GASKET Primary Gasket Kit 60539-94-K
JAMES GASKET
$96.95A compromised primary gasket doesn't just leak—it undermines engine reliability and invites costly repairs. The JAMES GASKET Primary Gasket Kit delivers OEM-grade sealing performance with silicone beading technology, ensuring your engine compartment...DS174950- SKU:
- DS174950
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET KIT
- FEATURES:
- BEADED
- MATERIAL:
- SILICONE
- THICKNESS IMPERIAL:
- 0,062'
- TYPE:
- PRIMARY COVER
- UNITS:
- KIT
- THICKNESS METRIC:
- 1.60 MM
- RIDING STYLE:
- STREET
$96.95 -
JAMES GASKET Head/Base Gasket - Big Twin 16770-84-A
JAMES GASKET
$42.95Head and base gasket failure compromises combustion integrity, bleeds performance, and risks catastrophic engine damage. James Gasket's OEM-matched kits eliminate guesswork with precision-cut gaskets and O-rings engineered specifically for Big Twin...DS174924- SKU:
- DS174924
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- MATERIAL:
- TEFLON
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,045'
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD BORE
- BORE SIZE IMPERIAL:
- 3.500'
- THICKNESS METRIC:
- 0.81 MM
- THICKNESS METRIC:
- 1.14 MM
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
- UNITS:
- KIT
$42.95 -
JAMES GASKET Upper Rocker Cover Cork Gasket - Big Twin 17356-84
JAMES GASKET
$45.60A leaking rocker cover gasket compromises engine sealing and invites oil contamination into your Big Twin engine. The JAMES GASKET Upper Rocker Cover Cork Gasket delivers a reliable, long-lasting seal using proven materials and engineering—eliminating...DS174916- SKU:
- DS174916
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- CORK
- TYPE:
- ROCKER BOX
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- UPPER
$45.60 -
JAMES GASKET Inner Rocker Cover Cork Gasket 17358-84
JAMES GASKET
$20.90A leaking rocker cover gasket means oil seepage, potential engine bay mess, and the risk of contamination—problems that compound quickly if left unaddressed. The JAMES GASKET Inner Rocker Cover Cork Gasket delivers a reliable, long-lasting seal using...DS174915- SKU:
- DS174915
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- INNER
- PRODUCT NAME:
- GASKET
- MATERIAL:
- CORK
- TYPE:
- ROCKER BOX
- UNITS:
- 10 PACK
$20.90 -
JAMES GASKET Cylinder/Base Gasket Set - Big Twin 16770-66-S
JAMES GASKET
$34.95A properly sealed engine is the foundation of reliable power delivery and longevity. The JAMES GASKET Cylinder/Base Gasket Set ensures your Big Twin maintains pressure integrity across combustion cycles, eliminating compression leaks that rob performance...DS174914- SKU:
- DS174914
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- THICKNESS IMPERIAL:
- 0,045'
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,032'
- THICKNESS METRIC:
- 1.14 MM
- BORE SIZE IMPERIAL:
- 3.625'
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD BORE
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- TEFLON
$34.95 -
JAMES GASKET Head Gasket - Teflon - .32" - XL 16769-73-T
JAMES GASKET
$39.10A head gasket is critical to maintaining compression and preventing coolant or oil seepage into the combustion chamber—failure here means catastrophic engine damage. The JAMES GASKET Teflon head gasket delivers reliable sealing with a .32" thickness...DS174913- SKU:
- DS174913
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- DISPLACEMENT:
- 1000 CC
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- THICKNESS IMPERIAL:
- 0,046'
- MATERIAL:
- TEFLON
- THICKNESS:
- 1,17 MM (0,046')
- THICKNESS METRIC:
- 1.17 MM
$39.10 -
JAMES GASKET Head Gasket V2 - Big Twin 16773-85
JAMES GASKET
$59.20A head gasket failure can compromise your engine's integrity and leave you stranded. The JAMES GASKET Head Gasket V2 is engineered to maintain a reliable seal under extreme combustion pressures and temperature cycling, giving you confidence in your Big...DS174912- SKU:
- DS174912
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE SIZE:
- -
- MATERIAL:
- -
- UNITS:
- 5 PACK
- BORE SIZE IMPERIAL:
- -
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$59.20 -
JAMES GASKET Fire Ring Head Gasket - FL 16770-66-X
JAMES GASKET
$39.95A head gasket is the critical seal between your engine block and cylinder head—compromise here, and you're looking at coolant leaks, combustion blowby, and catastrophic engine damage. The JAMES GASKET Fire Ring Head Gasket delivers the reliability and...DS174911- SKU:
- DS174911
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- FEATURES:
- FIRE RING
- RIDING STYLE:
- STREET
$39.95 -
JAMES GASKET Big Bore Kit - Big Twin 16770-84S
JAMES GASKET
$52.95A proper gasket seal is non-negotiable for big-bore performance—inadequate sealing leads to compression loss, oil leakage, and potential engine damage. The JAMES GASKET Big Bore Kit delivers the precision fit and material quality your engine demands,...DS174903- SKU:
- DS174903
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- STYLE:
- BIG BORE
- THICKNESS IMPERIAL:
- 0,045'
- THICKNESS METRIC:
- 1.14 MM
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- MATERIAL:
- TEFLON
- BORE SIZE IMPERIAL:
- 3.625'
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
$52.95 -
JAMES GASKET Rocker Box Rubber Gasket - XL 17030-89
JAMES GASKET
$68.95A deteriorating rocker box gasket is one of the most common culprits behind oil seepage and compromised valve train performance. The JAMES GASKET XL 17030-89 delivers a reliable, OE-quality seal that prevents costly oil loss and keeps your engine running...DS174902- SKU:
- DS174902
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- ROCKER BOX
- UNITS:
- KIT
$68.95 -
JAMES GASKET Teflon Head Gasket - XL 16769-57
JAMES GASKET
$43.20A compromised head gasket is one of the fastest ways to lose compression, leak coolant, and turn a reliable engine into a paperweight. The JAMES GASKET Teflon Head Gasket delivers the sealing integrity you need to maintain peak performance across...DS174900- SKU:
- DS174900
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MATERIAL:
- TEFLON
- THICKNESS:
- 1,14 MM (0,045')
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.14 MM
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,045'
$43.20 -
JAMES GASKET Countershaft Cap Gasket 36025-36
JAMES GASKET
$11.30A worn or damaged countershaft cap gasket compromises your transmission's seal integrity, leading to oil leakage, contamination, and potential internal damage. The JAMES GASKET Countershaft Cap Gasket 36025-36 delivers a reliable OEM-quality replacement...DS174899- SKU:
- DS174899
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
- STYLE:
- COVER
- TYPE:
- COUNTERSHAFT
- TYPE:
- TRANSMISSION
- UNITS:
- 10 PACK
- PRODUCT NAME:
- GASKET
$11.30 -
JAMES GASKET Trans Dust Cover Gasket 34565-52
JAMES GASKET
$9.50A transmission dust cover gasket is critical to preventing contaminants from entering your transmission housing while maintaining a reliable seal under thermal cycling and fluid exposure. The JAMES GASKET Trans Dust Cover Gasket uses advanced MicroPore...DS174897- SKU:
- DS174897
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- TYPE:
- SHIFTER ADAPTER PLATE
$9.50 -
JAMES GASKET Kicker Cover Gasket - 4 Speed 33295-36
JAMES GASKET
$10.60A quality kicker cover gasket is essential for maintaining a reliable, leak-free seal on your 4-speed transmission—critical when you're counting on consistent performance whether you're on the track or the street. JAMES GASKET's MicroPore technology...DS174895- SKU:
- DS174895
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- STYLE:
- 4-SPEED
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION END COVER
$10.60 -
JAMES GASKET New Switch Gasket - Big Twin 33043-80
JAMES GASKET
$5.00A properly sealed ignition switch cover is critical to keeping moisture and debris out of your Big Twin's electrical system. This JAMES GASKET replacement maintains OEM-spec sealing performance while delivering the durability your bike demands. Whether...DS174894- SKU:
- DS174894
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- UNITS:
- 10 PACK
- TYPE:
- TRANSMISSION
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- TYPE:
- NETURAL SWITCH
$5.00 -
JAMES GASKET Speedo Drive Gasket - Big Twin 67141-36
JAMES GASKET
$7.70A leaking speedometer drive gasket compromises accuracy and creates messy oil seepage around your transmission area. The JAMES GASKET Speedo Drive Gasket delivers a precision OEM-equivalent seal that restores reliable speedometer function and eliminates...DS174893- SKU:
- DS174893
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- TYPE:
- SPEEDOMETER DRIVE
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
$7.70 -
JAMES GASKET Trans Top Cover Gasket - Big Twin 34824-36
JAMES GASKET
$15.60A leaking transmission top cover gasket compromises both engine cleanliness and performance, allowing vital fluids to escape and inviting contamination into your drivetrain. The JAMES GASKET Trans Top Cover Gasket restores a reliable seal on Big Twin...DS174890- SKU:
- DS174890
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
- TYPE:
- TRANSMISSION TOP COVER
$15.60
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.
