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
-
On Sale
S&S CYCLE Base Gaskets - 3.625" - V2 930-0093
S&S CYCLE
MSRP: $16.95Now: $15.26Was: $16.95Base gasket failure can compromise your entire engine seal system, leading to oil leaks and catastrophic performance loss. S&S Cycle's Pro-Formance micropore compound is engineered to withstand extreme combustion pressures and extrusion forces that...09345019- SKU:
- 09345019
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,46 MM (0,018')
- THICKNESS IMPERIAL:
- 0,018'
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.625'
- FEATURES:
- STOCK BOLT PATTERN
- THICKNESS METRIC:
- 0.46 MM
MSRP: $16.95Now: $15.26Was: $16.95 -
On Sale
S&S CYCLE Rocker Box Gasket Kit 90-4049
S&S CYCLE
MSRP: $91.95Now: $82.76Was: $91.95Rocker box gaskets and O-rings deteriorate over time, leading to oil seepage, contamination, and potential engine damage. This complete S&S Cycle gasket kit eliminates guesswork by providing all necessary seals in one package, restoring proper...DS174301- SKU:
- DS174301
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- FEATURES:
- 4-BOLT STYLE
- TYPE:
- ROCKER BOX
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- FEATURES:
- FOR '84 - '99 EVOLUTION-STYLE BIG TWIN
- PRODUCT NAME:
- GASKET KIT
MSRP: $91.95Now: $82.76Was: $91.95 -
On Sale
S&S CYCLE Gasket Kit - 4-1/8" 106-0964
S&S CYCLE
MSRP: $225.95Now: $203.36Was: $225.95A quality gasket kit is the foundation of a reliable engine assembly—it seals critical surfaces and prevents oil leakage that can compromise performance and longevity. The S&S Cycle 4-1/8" gasket kit delivers OEM-level sealing with precision-cut...09345026- SKU:
- 09345026
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- TYPE:
- COMPLETE
- UNITS:
- KIT
- FEATURES:
- FOR '84 - '99 EVOLUTION-STYLE BIG TWIN
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
MSRP: $225.95Now: $203.36Was: $225.95 -
On Sale
S&S CYCLE Gasket Bowl - E/G 11-2386
S&S CYCLE
MSRP: $8.95Now: $8.06Was: $8.95A worn or damaged gasket bowl compromises your engine's sealing integrity, leading to oil leaks, contamination, and potential performance loss. The S&S Cycle Gasket Bowl ensures a precise, reliable seal on your evolution engine, maintaining consistent...09345028- SKU:
- 09345028
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- STYLE:
- SUPER E
- STYLE:
- SUPER G
- UNITS:
- EACH
- TYPE:
- FLOAT BOWL
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
MSRP: $8.95Now: $8.06Was: $8.95 -
DRAG SPECIALTIES Gasket Board - XL/EVO 0934-1667
DRAG SPECIALTIES
$108.95If you're rebuilding XL Evolution motors regularly, you need an organized system to keep gaskets, seals, and O-rings inventory visible and accessible. This four-color Drag Specialties display board eliminates wasted time hunting through bins and ensures...09341667- SKU:
- 09341667
- Availability:
- Ships Same Business Day
- Weight:
- 5.80 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- DISPLAY BOARD
- UNITS:
- EACH
- TYPE:
- GASKET
$108.95Qty in Cart: 0Quantity:Price:$108.95Subtotal: -
COMETIC Head Gasket - Standard - .040" C9984
COMETIC
$61.90A failing head gasket can compromise your engine's compression, cooling system integrity, and overall performance—and a quality replacement is non-negotiable for reliability. The COMETIC C9984 uses multi-layer steel construction with load control...09340794- SKU:
- 09340794
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- MATERIAL:
- LAYERED STEEL
- TYPE:
- CYLINDER HEAD
- THICKNESS IMPERIAL:
- 0,040'
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,02 MM (0,040')
$61.90 -
COMETIC Complete Gasket Kit - FL/FLH C9966
COMETIC
$190.00A complete gasket failure can end your race day before it starts. The COMETIC C9966 kit eliminates guesswork by pairing multi-layer steel head gaskets with application-specific materials throughout your engine, giving you the reliability to focus on...09340816- SKU:
- 09340816
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,437'
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- TYPE:
- COMPLETE
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.437'
- PRODUCT NAME:
- GASKET KIT
$190.00 -
COMETIC Trans Gasket - 5 Speed C9466
COMETIC
$86.05Transmission gasket failures lead to fluid leaks, loss of shift quality, and costly internal damage—often when you can least afford downtime. The COMETIC Trans Gasket C9466 eliminates guesswork with application-specific materials engineered to seal...09340821- SKU:
- 09340821
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- GASKET KIT
- STYLE:
- 5-SPEED
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
$86.05Qty in Cart: 0Quantity:Price:$86.05Subtotal: -
COMETIC Trans Gasket - 5 Speed C9467
COMETIC
$102.85Transmission gasket failure creates catastrophic fluid loss and drivetrain damage—often at the worst possible moment. The COMETIC Trans Gasket C9467 eliminates guesswork with application-specific engineering and OEM-quality sealing surfaces, giving you...09340822- SKU:
- 09340822
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
- STYLE:
- 5-SPEED
- UNITS:
- KIT
$102.85 -
COMETIC Trans Gasket - FXD C9468
COMETIC
$56.65A transmission gasket kit is critical for maintaining pressure integrity and preventing costly fluid leaks that compromise performance and engine longevity. The COMETIC Trans Gasket C9468 delivers application-specific engineering with premium materials...09340823- SKU:
- 09340823
- Availability:
- Ships Same Business Day
- Weight:
- 0.54 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
- STYLE:
- 5-SPEED
$56.65 -
COMETIC Trans Gasket - FXD C9640
COMETIC
$47.20Transmission gasket failure can compromise your entire drivetrain, leading to fluid leaks, contamination, and costly downtime. The COMETIC Trans Gasket C9640 is engineered with application-specific materials to deliver a reliable seal that withstands the...09340825- SKU:
- 09340825
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- TRANSMISSION
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
$47.20Qty in Cart: 0Quantity:Price:$47.20Subtotal: -
COMETIC Base Gasket - Evo - 4" - .010" C9871
COMETIC
$33.55A quality head gasket is the foundation of a reliable, high-power engine build. The COMETIC Base Gasket for Evo applications delivers consistent sealing across demanding boost levels and repeated heat cycles, preventing compression loss and coolant leaks...09340005- SKU:
- 09340005
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- RUBBER
- TYPE:
- CYLINDER BASE
- BORE SIZE IMPERIAL:
- 4.000'
- STYLE:
- STANDARD
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.25 MM
$33.55 -
COMETIC Head Gasket - 4"- .030" C9878
COMETIC
$61.90A head gasket is your engine's critical seal—it prevents combustion pressure and coolant from leaking into the block while maintaining precise compression. The COMETIC C9878 MLS design distributes clamping force evenly across the sealing surface,...09340008- SKU:
- 09340008
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 4,000'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- UNITS:
- PAIR
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
$61.90 -
COMETIC Head Gasket - 4"- .036" C9879
COMETIC
$61.90A quality head gasket is the foundation of reliable combustion sealing—without it, you're risking coolant leaks, oil contamination, and catastrophic engine failure. The COMETIC C9879 uses advanced multi-layer steel construction with load control...09340009- SKU:
- 09340009
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.91 MM
- UNITS:
- PAIR
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,036'
- BORE SIZE:
- 4,000'
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,91 MM (0,036')
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 4.000'
$61.90 -
COMETIC Cylinder Head Gasket C10167-045
COMETIC
$61.90A reliable cylinder head gasket is the foundation of a sealed, efficient combustion chamber—without it, you're looking at coolant leaks, oil weeping, and lost compression. The COMETIC C10167-045 uses a proven multi-layer design with stainless steel shim...09345926- SKU:
- 09345926
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE SIZE:
- 4,145'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- THICKNESS IMPERIAL:
- 0,045'
- THICKNESS METRIC:
- 1.14 MM
- BORE SIZE IMPERIAL:
- 4.145'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 2 PACK
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Cylinder Head Gasket C10168
COMETIC
$61.90A compromised cylinder head gasket will kill performance and reliability faster than worn rings. The COMETIC C10168 delivers the sealing integrity your engine demands, whether you're running aggressive boost pressures, high compression ratios, or...09345928- SKU:
- 09345928
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- 2 PACK
- BORE SIZE IMPERIAL:
- 4.205'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- BORE SIZE:
- 4,205'
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- TYPE:
- CYLINDER HEAD
$61.90 -
COMETIC Cylinder Head Gasket C10168-030
COMETIC
$61.90A failed cylinder head gasket compromises compression, causes coolant leaks, and can result in catastrophic engine damage if left unchecked. The COMETIC C10168-030 delivers multi-layer construction with precision engineering to maintain a reliable seal...09345929- SKU:
- 09345929
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- THICKNESS IMPERIAL:
- 0,030'
- UNITS:
- 2 PACK
- BORE SIZE IMPERIAL:
- 4.205'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,205'
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
$61.90 -
COMETIC Cylinder Head Gasket C10169-030
COMETIC
$61.90A proper cylinder head gasket is non-negotiable for maintaining compression, preventing coolant crossover, and protecting against oil leakage across multiple heat cycles. The COMETIC C10169-030 delivers the reliability demanded by serious engine builders...09345932- SKU:
- 09345932
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE IMPERIAL:
- 4.220'
- THICKNESS IMPERIAL:
- 0,030'
- UNITS:
- 2 PACK
- BORE SIZE:
- 4,220'
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- TYPE:
- CYLINDER HEAD
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Airbox/Throttle Body Gasket C10176
COMETIC
$5.95A reliable airbox-to-throttle body seal is critical to maintaining proper fuel mixture and preventing vacuum leaks that degrade performance and fuel economy. The COMETIC C10176 eliminates the guesswork with a precision-engineered gasket that seats...09345936- SKU:
- 09345936
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- THICKNESS METRIC:
- 0.79 MM
- THICKNESS:
- 0,79 MM (0,031')
- THICKNESS IMPERIAL:
- 0,031'
- TYPE:
- THROTTLE BODY
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- AIRBOX
- UNITS:
- EACH
$5.95 -
COMETIC Cylinder Head Gasket/Base C10191-HB
COMETIC
$81.85A compromised head gasket kills performance and reliability—and COMETIC's Multi-Layer Steel design ensures a leak-free seal that withstands high combustion pressures, boost cycles, and extended track sessions. Built with precision engineering and...09345952- SKU:
- 09345952
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE SIZE:
- 4,250'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,014'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE IMPERIAL:
- 4.250'
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS IMPERIAL:
- 0,040'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,36 MM (0,014')
- THICKNESS METRIC:
- 0.36 MM
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
- UNITS:
- KIT
$81.85Qty in Cart: 0Quantity:Price:$81.85Subtotal:
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.
