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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COMETIC Base Gasket - Evo - .010" C9101
COMETIC
$33.55A quality head gasket is non-negotiable if you're chasing reliable power and ring seal integrity on your Evo platform. The COMETIC Base Gasket delivers proven MLS construction with Load Control Embossments that distribute clamping force evenly across the...09340773- SKU:
- 09340773
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.25 MM
- TYPE:
- CYLINDER BASE
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD
- UNITS:
- PAIR
$33.55 -
COMETIC Base Gasket - .010" - XL C9100
COMETIC
$33.55A properly sealed combustion chamber is non-negotiable for consistent power output and engine reliability. The COMETIC Base Gasket delivers precision multi-layer steel construction with strategically embossed load control points, ensuring even clamping...09340772- SKU:
- 09340772
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.25 MM
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD
$33.55 -
JAMES GASKET Oil Pump Crank Gasket - CSE XL 26256-52
JAMES GASKET
$14.00Oil seepage at the crankshaft can compromise engine reliability and create costly leaks that damage surrounding components. The JAMES GASKET Oil Pump Crank Gasket provides a precision seal engineered to eliminate weeping and maintain oil pressure...DS174880- SKU:
- DS174880
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- STYLE:
- BODY TO CRANKCASE
$14.00Qty in Cart: 0Quantity:Price:$14.00Subtotal: -
COMETIC Complete Gasket Kit - .030" - 4/5 Speed C9847F
COMETIC
$356.95A complete gasket kit is foundational to engine reliability—one failed gasket can compromise your entire build. The Cometic C9847F delivers the precision sealing you need across all critical engine interfaces, using purpose-engineered materials that...09340801- SKU:
- 09340801
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
$356.95 -
COMETIC Complete Gasket Kit - .030" C9848F
COMETIC
$356.95A complete gasket kit eliminates the guesswork when rebuilding or refreshing your engine—you get every seal you need in one package, eliminating multiple orders and potential fitment issues. COMETIC's layered approach to gasket design ensures reliable...09340802- SKU:
- 09340802
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,030'
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- COMPLETE
- BORE SIZE:
- 3,500'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE IMPERIAL:
- 3.500'
- UNITS:
- KIT
$356.95 -
COMETIC Head Gasket - .060 - MLS Evo C9180
COMETIC
$90.25A quality head gasket is fundamental to engine reliability—it's your seal against catastrophic coolant and oil leaks, combustion blow-by, and loss of compression. The COMETIC MLS design distributes clamping force evenly across the sealing surface,...09341227- SKU:
- 09341227
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- BORE SIZE:
- 3,750'
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- BORE SIZE IMPERIAL:
- 3.750'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
$90.25 -
COMETIC Derby Cover Gasket - 3 Hole C9183F5
COMETIC
$21.30A quality derby cover gasket is essential for maintaining a reliable seal on your Harley Davidson's engine, preventing oil seepage and protecting internal components from contamination. Cometic's precision-engineered gasket delivers the durability and...09341228- SKU:
- 09341228
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- CLUTCH COVER
- TYPE:
- DERBY COVER
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
$21.30 -
COMETIC Output Gear Seal C9200F1
COMETIC
$11.95Transmission output seals are critical to maintaining hydraulic pressure and preventing fluid contamination in your Twin Cam drivetrain. A compromised seal leads to slow leaks, loss of lubrication, and potential transmission damage—all preventable with a...09346322- SKU:
- 09346322
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- TYPE:
- OUTPUT GEAR
- UNITS:
- EACH
- RIDING STYLE:
- STREET
$11.95 -
COMETIC Top End Gasket Kit - M8 C10219
COMETIC
$240.40A failing top end gasket kit can compromise your engine's reliability and performance, especially under high boost or sustained RPM. The COMETIC EST (Extreme Sealing Technology) gasket kit eliminates hot spots that lead to premature gasket failure by...09346324- SKU:
- 09346324
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- BORE SIZE:
- 4,075'
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 4.075'
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$240.40 -
COMETIC Cylinder Base Gasket C9568-1
COMETIC
$4.95A properly sealed combustion chamber is non-negotiable for engine reliability and power output. The COMETIC Cylinder Base Gasket C9568-1 uses multi-layer steel construction with load control embossments to maintain consistent sealing pressure across the...09344712- SKU:
- 09344712
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,031'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- MATERIAL:
- FIBER
- THICKNESS METRIC:
- 0.79 MM
- UNITS:
- EACH
$4.95 -
COMETIC Rocker Cover Gasket C9602-2
COMETIC
$5.95A compromised rocker cover gasket leads to oil seepage, visible leaks on your engine bay, and potential contamination of spark plug wells. The COMETIC Rocker Cover Gasket C9602-2 delivers a reliable seal using aerospace-grade materials engineered to...09344714- SKU:
- 09344714
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- MATERIAL:
- FIBER
- TYPE:
- ROCKER COVER
- UNITS:
- PAIR
$5.95 -
EASTERN MOTORCYCLE PARTS Steel Breather Valve Washer Kit - Big Twin A-25302-SET
EASTERN MOTORCYCLE PARTS
$31.95Precision breather valve calibration is critical for maintaining proper crankcase pressure and preventing seal degradation in Big Twin engines. This comprehensive washer kit eliminates guesswork by providing eight thickness options, allowing you to dial...DS194159- SKU:
- DS194159
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- WASHER
- UNITS:
- SET
- RIDING STYLE:
- STREET
- TYPE:
- BREATHER
$31.95 -
REVOLUTION PERFORMANCE, LLC Gasket Kit - M8 RP10181HB030014
REVOLUTION PERFORMANCE, LLC
$89.95A quality gasket kit is essential for maintaining compression integrity and preventing fluid leaks in high-performance applications. The REVOLUTION PERFORMANCE M8 RP10181HB030014 delivers the precision engineering and material durability required for...09347159- SKU:
- 09347159
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$89.95 -
COMETIC Top End Gasket - 4" - S&S C9917
COMETIC
$142.75A quality top-end gasket kit is non-negotiable for maintaining combustion integrity and preventing coolant or oil seepage in high-performance engines. Cometic's EST gasket design uses embossed stainless steel construction with proprietary rubber facing...09340767- SKU:
- 09340767
- Availability:
- Ships Same Business Day
- Weight:
- 0.93 LBS
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- BORE SIZE:
- 4,000'
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
$142.75 -
On Sale
S&S CYCLE Lower End Gasket Kit 31-2067
S&S CYCLE
MSRP: $52.95Now: $47.66Was: $52.95A compromised lower end gasket kit invites oil leaks, contamination, and catastrophic engine failure—especially in high-performance applications where precision matters. The S&S Cycle Lower End Gasket Kit 31-2067 delivers OEM-quality sealing with...312067- SKU:
- 312067
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- LOWER END
MSRP: $52.95Now: $47.66Was: $52.95Qty in Cart: 0Quantity:Price:MSRP: $52.95Now: $47.66Was: $52.95Subtotal: -
On Sale
S&S CYCLE Gaskets - 4" - .045 - STL 900-0822
S&S CYCLE
MSRP: $91.95Now: $82.76Was: $91.95A quality head gasket is fundamental to engine reliability and performance—it's the critical seal that prevents combustion blow-by and coolant cross-contamination. S&S Cycle's gaskets use aramid fiber-reinforced graphite with a steel core and stainless...09346418- SKU:
- 09346418
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,14 MM (0,045')
- THICKNESS IMPERIAL:
- 0.045'
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4'
- PRODUCT NAME:
- GASKET
- BORE SIZE IMPERIAL:
- 4'
- MATERIAL:
- LAYERED STEEL
- THICKNESS METRIC:
- 1.14 MM
MSRP: $91.95Now: $82.76Was: $91.95Qty in Cart: 0Quantity:Price:MSRP: $91.95Now: $82.76Was: $91.95Subtotal:
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.
