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 Complete Gasket Kit - 3-5/8" C9164
COMETIC
$356.95A complete gasket kit eliminates the guesswork and potential for leaks across your engine bay—every critical seal is engineered from the ground up to handle racing demands and extended engine life. COMETIC's layered approach to gasket design means you're...09341216- SKU:
- 09341216
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- BORE SIZE IMPERIAL:
- 3.625'
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- BORE SIZE:
- 3,625'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
$356.95Qty in Cart: 0Quantity:Price:$356.95Subtotal: -
COMETIC Complete Gasket Kit - Twin Cam - .030" C9161
COMETIC
$209.95A complete gasket kit is the foundation of a reliable, leak-free engine—especially critical for Twin Cam applications where precision sealing directly impacts performance and longevity. COMETIC's complete kit eliminates the guesswork of sourcing...09341215- SKU:
- 09341215
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- BORE SIZE:
- 3,875'
- TYPE:
- COMPLETE
- THICKNESS IMPERIAL:
- 0,030'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.875'
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
$209.95 -
JAMES GASKET Cam Cover Gasket - XL 25263-86-X
JAMES GASKET
$37.30Cam cover gaskets are critical sealing components that prevent oil leakage from your engine's top end—a common failure point that can lead to messy drips and potential internal damage if left unaddressed. The JAMES GASKET XL 25263-86-X is engineered to...09341185- SKU:
- 09341185
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- TYPE:
- CAM COVER
- FEATURES:
- BEADED
- MATERIAL:
- SILICONE
- UNITS:
- 5 PACK
$37.30 -
JAMES GASKET Cam Cover Gasket - Big Twin 25225-36-CX
JAMES GASKET
$21.10Cam cover gasket failures lead to oil seepage, reduced engine efficiency, and costly secondary damage if left unaddressed. The JAMES GASKET Cam Cover Gasket is engineered for precise fitment and reliable sealing, restoring your Big Twin's cam chest...09341184- SKU:
- 09341184
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- MATERIAL:
- PAPER
- UNITS:
- 5 PACK
- FEATURES:
- BEADED
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS METRIC:
- 0.51 MM
- TYPE:
- CAM COVER
- PRODUCT NAME:
- GASKET
$21.10 -
COMETIC Base Gasket - 3-5/8" - .010" C9532
COMETIC
$33.55A head gasket failure can cost you an entire race weekend or months of engine downtime. The COMETIC Base Gasket delivers the reliability and sealing integrity that high-performance engines demand, with MLS construction that maintains cylinder pressure...09340780- SKU:
- 09340780
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.25 MM
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.625'
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
$33.55 -
COMETIC Base Gasket - Twin Cam 4" - .020" C9738
COMETIC
$33.55A quality head gasket is the foundation of engine reliability—it seals combustion pressure and maintains compression under extreme heat and load. The COMETIC Base Gasket for Twin Cam engines uses multi-layer steel construction with load control...09340776- SKU:
- 09340776
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- STYLE:
- STANDARD
- THICKNESS METRIC:
- 0.51 MM
- PRODUCT NAME:
- GASKET
- MATERIAL:
- STEEL
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
$33.55 -
COMETIC Top End Gasket - Standard - .030" C9845
COMETIC
$150.10A failed top end gasket can sideline your engine and derail your season. The COMETIC C9845 uses Extreme Sealing Technology to eliminate hot spots and prevent gasket failure through superior heat dissipation—keeping your combustion seal reliable under...09340771- SKU:
- 09340771
- Availability:
- Ships Same Business Day
- Weight:
- 0.83 LBS
- BORE SIZE:
- 3,750'
- DISPLACEMENT:
- 88'
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,030'
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.750'
- THICKNESS METRIC:
- 0.76 MM
$150.10 -
COMETIC Top End Gasket - FL/FLH C9968
COMETIC
$135.40A top-end rebuild demands precision—and the wrong gaskets will compromise your seal integrity, allowing combustion pressure to escape and coolant to breach critical areas. COMETIC's EST (Extreme Sealing Technology) gasket kit eliminates guesswork with...09340770- SKU:
- 09340770
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- MATERIAL:
- ALUMINUM
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 3.437'
- MATERIAL:
- FOAM
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE:
- 3,437'
- UNITS:
- KIT
$135.40 -
JAMES GASKET Gasket Kit - Flathead 17027-36
JAMES GASKET
$90.95A complete engine rebuild demands precision sealing—and this James Gasket kit eliminates the guesswork by bundling every gasket, oil seal, and O-ring your Panhead engine needs in one factory-engineered package. U.S.A.-made quality ensures consistent...09340546- SKU:
- 09340546
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- TYPE:
- MOTOR
- UNITS:
- KIT
$90.95 -
JAMES GASKET Carb Back Plate Gasket 29583-01
JAMES GASKET
$15.30A worn or damaged carb back plate gasket compromises fuel atomization and can introduce vacuum leaks that throw off your air-fuel ratio. The JAMES GASKET Carb Back Plate Gasket 29583-01 seals the critical interface between your carburetor and intake...09340324- SKU:
- 09340324
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- MOUNTING POSITION:
- CARBURETOR/THROTTLE BODY TO BACK PLATE
- STYLE:
- CARBURETOR
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- BACKPLATE
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 10 PACK
$15.30 -
JAMES GASKET Derby Cover Paper Gasket 25416-99-X
JAMES GASKET
$36.80A leaking derby cover isn't just messy—it's a sign your engine seal has failed, and that means oil is finding its way where it shouldn't. The JAMES GASKET Derby Cover Paper Gasket delivers a reliable, OEM-quality seal that stops seepage before it starts,...09340289- SKU:
- 09340289
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- FEATURES:
- BEADED
- MATERIAL:
- SILICONE
- PRODUCT NAME:
- GASKET
- STYLE:
- PRIMARY
- THICKNESS:
- 0,80 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.80 MM
- UNITS:
- 5 PACK
- TYPE:
- DERBY COVER
$36.80 -
JAMES GASKET Primary Gasket 34955-04
JAMES GASKET
$95.70A reliable primary gasket is non-negotiable for maintaining combustion chamber integrity and preventing oil seepage in high-stress engine environments. The JAMES GASKET Primary Gasket 34955-04 delivers OEM-equivalent performance with silicone beading...09340288- SKU:
- 09340288
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- MATERIAL:
- SILICONE
- PRODUCT NAME:
- GASKET
- STYLE:
- PRIMARY
- UNITS:
- 5 PACK
- FEATURES:
- BEADED
- MATERIAL:
- PAPER
- THICKNESS METRIC:
- 0.79 MM
- TYPE:
- COVER
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,031'
$95.70 -
DRAG SPECIALTIES Gasket Board - Big Twin 0934-0274
DRAG SPECIALTIES
$127.00If you're running a shop that rebuilds Big Twin motors, you need a system that keeps every gasket, seal, and O-ring organized and visible—so you're never caught unprepared mid-rebuild. This Drag Specialties display board does exactly that, giving you a...09340274- SKU:
- 09340274
- Availability:
- Ships Same Business Day
- Weight:
- 5.30 LBS
- TYPE:
- GASKET
- PRODUCT NAME:
- DISPLAY BOARD
- UNITS:
- EACH
- RIDING STYLE:
- STREET
$127.00 -
JAMES GASKET Head Gasket - XL883 16664-86
JAMES GASKET
$48.30A proper head gasket seal is non-negotiable for reliable engine operation—any compromise here leads to coolant leaks, combustion blow-by, and catastrophic engine damage. The JAMES GASKET Head Gasket for XL883 engines delivers OEM-equivalent performance...09340260- SKU:
- 09340260
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- -
- THICKNESS IMPERIAL:
- 0,045'
- UNITS:
- 5 PACK
- BORE SIZE:
- -
- BORE SIZE IMPERIAL:
- -
- THICKNESS METRIC:
- 1.14 MM
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
$48.30 -
JAMES GASKET Oil Pan Gasket - Twin Cam 26077-99
JAMES GASKET
$33.90A leaking oil pan gasket compromises engine sealing and invites costly oil loss and potential engine damage. The JAMES GASKET Oil Pan Gasket for Twin Cam engines delivers a reliable, OEM-quality seal that restores your engine's integrity without...09342877- SKU:
- 09342877
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PAN
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
$33.90 -
JAMES GASKET Oil Deflector Seal Kit 60518-65-DLK
JAMES GASKET
$25.94Oil deflector seals are critical to preventing crankcase blow-by and oil leakage at the crankshaft—two issues that compromise engine efficiency and create messy underhood conditions. The JAMES GASKET Oil Deflector Seal Kit 60518-65-DLK is engineered to...09342119- SKU:
- 09342119
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- STARTER HOUSING
- TYPE:
- SHIFT LEVER
$25.94 -
JAMES GASKET Oil Pump Gasket MET Kit - Big Twin 92-FLHR
JAMES GASKET
$17.95A properly functioning oil pump is critical to engine longevity—inadequate oil delivery leads to bearing wear, sludge buildup, and catastrophic failure. The JAMES GASKET Oil Pump Gasket MET Kit provides everything needed to fully rebuild or rebush your...DS173382- SKU:
- DS173382
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- OIL PUMP
$17.95 -
JAMES GASKET Oil Pump Gasket - XL 26495-89
JAMES GASKET
$9.60A failing oil pump gasket compromises your engine's lubrication system, risking catastrophic bearing damage and complete engine failure. The JAMES GASKET Oil Pump Gasket XL 26495-89 is engineered to maintain a reliable seal under sustained pressure and...DS174876- SKU:
- DS174876
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- STYLE:
- MOUNT
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
$9.60 -
JAMES GASKET Oil Pan Gasket - FXD 26072-90
JAMES GASKET
$35.10A leaking oil pan gasket compromises engine seal integrity and risks catastrophic oil loss during operation. The JAMES GASKET Oil Pan Gasket is engineered to OEM specifications, ensuring reliable sealing under sustained heat cycles and pressure...DS174877- SKU:
- DS174877
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PAN
- UNITS:
- 10 PACK
- DISPLACEMENT:
- 1340 CC
$35.10Qty in Cart: 0Quantity:Price:$35.10Subtotal: -
JAMES GASKET Oil Spout Gasket - FXD 62423-90
JAMES GASKET
$17.70An oil spout gasket might seem like a minor component, but a failed seal here means oil leaks, contamination, and potential engine damage. The JAMES GASKET Oil Spout Gasket for FXD models delivers a reliable, OEM-quality seal that keeps your crankcase...DS174879- SKU:
- DS174879
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL FILLER
$17.70
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.
