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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DRAG SPECIALTIES Gasket Header - Softail I01-0205A
DRAG SPECIALTIES
$38.80A quality exhaust gasket is critical to maintaining a sealed header system—any leak compromises performance, wastes fuel, and introduces unwanted noise into your ride. The DRAG Specialties Gasket Header is engineered to prevent exhaust leakage at the...09346424- SKU:
- 09346424
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
$38.80 -
DRAG SPECIALTIES Master Cylinder Gasket 027512-HC3
DRAG SPECIALTIES
$26.20A leaking master cylinder doesn't just compromise braking performance—it creates a safety hazard that demands immediate attention. This genuine DRAG SPECIALTIES replacement gasket restores a perfect seal on your stock master cylinder cover, preventing...DS174940- SKU:
- DS174940
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- MASTER CYLINDER COVER
- UNITS:
- 10 PACK
- MOUNTING POSITION:
- FRONT
- RIDING STYLE:
- STREET
$26.20 -
On Sale
S&S CYCLE Gaskets - 74/80" - .032" 930-0088
S&S CYCLE
MSRP: $71.95Now: $64.76Was: $71.95A reliable head gasket is the foundation of engine integrity, and S&S Cycle's proven design ensures consistent sealing under the extreme pressures of high-performance riding. Built with aramid fiber-reinforced graphite and a stainless steel fire ring,...09345016- SKU:
- 09345016
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- THICKNESS IMPERIAL:
- 0,032'
- BORE SIZE IMPERIAL:
- 3.500'
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- BORE SIZE:
- 3,500'
- MATERIAL:
- COPPER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS METRIC:
- 0.81 MM
MSRP: $71.95Now: $64.76Was: $71.95 -
On Sale
S&S CYCLE Base Gaskets - 3-5/8" - Shovelhead 930-0096
S&S CYCLE
MSRP: $19.95Now: $17.96Was: $19.95Base gaskets are critical to engine sealing integrity, and failure here means catastrophic oil loss and potential engine damage. S&S Cycle's Pro-Formance micropore compound delivers proven resistance to extrusion and blow-out—the two primary failure...09345024- SKU:
- 09345024
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,018'
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.625'
- FEATURES:
- STOCK BOLT PATTERN
- THICKNESS:
- 0,46 MM (0,018')
- THICKNESS METRIC:
- 0.46 MM
MSRP: $19.95Now: $17.96Was: $19.95 -
On Sale
S&S CYCLE Gaskets - 3.94" - Twin Cam 900-0862
S&S CYCLE
MSRP: $91.95Now: $82.76Was: $91.95A head gasket failure can sideline your engine and drain your wallet. S&S Cycle's 3.94" gaskets are engineered with aramid fiber-reinforced graphite and a stainless steel fire ring to withstand the extreme pressures of high-performance Twin Cam 900...09345025- SKU:
- 09345025
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.940'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.09 MM
- BORE SIZE:
- 3,940'
- THICKNESS IMPERIAL:
- 0,043'
- MATERIAL:
- STEEL
- THICKNESS:
- 1,09 MM (0,043')
MSRP: $91.95Now: $82.76Was: $91.95Qty in Cart: 0Quantity:Price:MSRP: $91.95Now: $82.76Was: $91.95Subtotal: -
On Sale
S&S CYCLE Rocker Box Top Gasket 90-4079
S&S CYCLE
MSRP: $19.95Now: $17.96Was: $19.95Rocker box gaskets are critical sealing components that prevent oil seepage and maintain proper engine pressurization in your big twin. A worn or degraded gasket compromises engine integrity and creates messy leaks that can damage surrounding components...09345032- SKU:
- 09345032
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- EACH
- TYPE:
- ROCKER COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
MSRP: $19.95Now: $17.96Was: $19.95 -
On Sale
S&S CYCLE Tapped Guide Gaskets 33-5302
S&S CYCLE
MSRP: $10.95Now: $9.86Was: $10.95Proper crankcase sealing is critical for maintaining oil pressure, preventing leaks, and ensuring consistent engine performance in high-revving applications. S&S Cycle's Tapped Guide Gaskets are engineered to OEM specifications for Super Stock...09345076- SKU:
- 09345076
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- PAIR
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- TAPPET GUIDE
MSRP: $10.95Now: $9.86Was: $10.95 -
On Sale
S&S CYCLE Rocker Box Gasket - Big Twin 90-4073
S&S CYCLE
MSRP: $61.95Now: $55.76Was: $61.95Rocker box gaskets are a critical wear item that directly impact oil containment and engine reliability on Big Twin platforms. Deteriorating or leaking gaskets compromise engine sealing, increase oil consumption, and can lead to catastrophic engine...DS174081- SKU:
- DS174081
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- TYPE:
- ROCKER BOX
- UNITS:
- KIT
- FEATURES:
- FOR '99 - '06 BIG TWIN CAM S&S ROCKER BOXES
- PRODUCT NAME:
- GASKET KIT
- FEATURES:
- 6-BOLT STYLE
- RIDING STYLE:
- STREET
MSRP: $61.95Now: $55.76Was: $61.95 -
On Sale
S&S CYCLE Complete Gasket Kit - 4" 106-1020
S&S CYCLE
MSRP: $224.95Now: $202.46Was: $224.95Engine gasket sets are critical to maintaining compression, preventing fluid leaks, and ensuring reliable performance during extended track sessions or spirited driving. The S&S Cycle Complete Gasket Kit provides OEM-quality sealing across your engine's...09344759- SKU:
- 09344759
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE IMPERIAL:
- 4.000'
- FEATURES:
- FOR '84 - '99 EVOLUTION-STYLE BIG TWIN
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- TYPE:
- COMPLETE
MSRP: $224.95Now: $202.46Was: $224.95 -
On Sale
S&S CYCLE Gasket Set - 3.625" - V2 Big Twin 90-1906
S&S CYCLE
MSRP: $67.95Now: $61.16Was: $67.95Maintaining proper sealing integrity is critical to engine reliability and performance longevity. This OEM-quality gasket set from S&S Cycle ensures leak-free operation across all critical sealing points, preventing oil weeping, combustion gas escape,...09340326- SKU:
- 09340326
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- RIDING STYLE:
- STREET
- UNITS:
- SET
- TYPE:
- EXHAUST
- BORE SIZE IMPERIAL:
- 3.625'
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 3,625'
- PRODUCT NAME:
- GASKET
MSRP: $67.95Now: $61.16Was: $67.95 -
On Sale
S&S CYCLE Top End Gasket Kit - 4-1/8" 90-9510
S&S CYCLE
MSRP: $181.95Now: $163.76Was: $181.95A top-end gasket kit is essential maintenance for any big-inch Harley-Davidson engine—it seals critical combustion chamber surfaces and prevents oil weeping that compromises performance and reliability. The S&S Cycle 4-1/8" gasket set is engineered to...09340653- SKU:
- 09340653
- Availability:
- Ships Same Business Day
- Weight:
- 0.33 LBS
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 4.125'
- UNITS:
- KIT
- FEATURES:
- STOCK BOLT PATTERN
- PRODUCT NAME:
- GASKET KIT
MSRP: $181.95Now: $163.76Was: $181.95 -
On Sale
S&S CYCLE Base/Head Gaskets - Big Bore - Big Twin 90-1918
S&S CYCLE
MSRP: $102.95Now: $92.66Was: $102.95Big Twin engines demand gaskets that won't fail under sustained high-combustion pressures—and stock gaskets simply aren't engineered for the abuse. S&S Cycle's Big Bore gaskets combine aramid fiber reinforcement with a stainless steel fire ring to...09342106- SKU:
- 09342106
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- BORE SIZE IMPERIAL:
- 3.625'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- COPPER
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 0.81 MM
- BORE SIZE:
- 3,625'
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
MSRP: $102.95Now: $92.66Was: $102.95 -
On Sale
S&S CYCLE Top End Gasket - 4.125" 90-1914
S&S CYCLE
MSRP: $147.95Now: $133.16Was: $147.95A quality top-end gasket set is critical for maintaining compression, preventing coolant and oil seepage, and ensuring consistent performance across engine cycles. The S&S CYCLE 4.125" gasket kit delivers OEM-grade sealing with precision-engineered...09344753- SKU:
- 09344753
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE SIZE IMPERIAL:
- 4.125'
- BORE SIZE:
- 4,125'
- MATERIAL:
- LAYERED STEEL
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
MSRP: $147.95Now: $133.16Was: $147.95 -
On Sale
S&S CYCLE Gaskets 3-5/8" (.062) 930-0097
S&S CYCLE
MSRP: $52.95Now: $47.66Was: $52.95A quality head gasket is non-negotiable for engine reliability and performance—it's your first line of defense against combustion pressure, coolant leaks, and catastrophic failure. The S&S CYCLE 3-5/8" gasket combines premium materials with precision...09345011- SKU:
- 09345011
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- MICROPORE COMPOUND
- THICKNESS:
- 1,60 MM (0,062')
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.60 MM
- UNITS:
- PAIR
- BORE SIZE:
- 3,625'
- THICKNESS IMPERIAL:
- 0.062'
- BORE SIZE IMPERIAL:
- 3.625'
- TYPE:
- CYLINDER HEAD
MSRP: $52.95Now: $47.66Was: $52.95 -
On Sale
S&S CYCLE Gaskets - 4" - Evo - .043" 930-0087
S&S CYCLE
MSRP: $27.95Now: $25.16Was: $27.95A head gasket failure can sideline your engine and derail your season. S&S Cycle's 4" gaskets are engineered with aramid fiber-reinforced premium graphite and a stainless steel fire ring to handle the extreme combustion pressures of high-performance Evo...09345012- SKU:
- 09345012
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE IMPERIAL:
- 4.000'
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,000'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,09 MM (0,043')
- THICKNESS METRIC:
- 1.09 MM
- MATERIAL:
- MICROPORE COMPOUND
- THICKNESS IMPERIAL:
- 0,043'
- UNITS:
- PAIR
MSRP: $27.95Now: $25.16Was: $27.95 -
On Sale
S&S CYCLE Base Gaskets - 3.5" - V2 930-0092
S&S CYCLE
MSRP: $24.95Now: $22.46Was: $24.95Engine base gasket failure can compromise your entire bottom-end assembly, leading to oil leaks, pressure loss, and catastrophic damage during high-performance operation. The S&S Cycle Base Gaskets utilize a proven Pro-Formance micropore compound...09345018- SKU:
- 09345018
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,46 MM (0,018')
- UNITS:
- PAIR
- FEATURES:
- STOCK BOLT PATTERN
- THICKNESS IMPERIAL:
- 0,018'
- TYPE:
- CYLINDER BASE
- THICKNESS METRIC:
- 0.46 MM
MSRP: $24.95Now: $22.46Was: $24.95Qty in Cart: 0Quantity:Price:MSRP: $24.95Now: $22.46Was: $24.95Subtotal: -
On Sale
S&S CYCLE Base Gaskets - 4.125" - STK 930-0101
S&S CYCLE
MSRP: $25.95Now: $23.36Was: $25.95A blown base gasket can sideline your engine at the worst possible moment—mid-race or mid-build. S&S Cycle's base gaskets are engineered with their Pro-Formance micropore compound to withstand extreme combustion pressures and prevent the extrusion...09345020- SKU:
- 09345020
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE IMPERIAL:
- 4.125'
- FEATURES:
- STOCK BOLT PATTERN
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,46 MM (0,018')
- THICKNESS IMPERIAL:
- 0,018'
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- THICKNESS METRIC:
- 0.46 MM
MSRP: $25.95Now: $23.36Was: $25.95 -
On Sale
S&S CYCLE Base Gaskets - 4.125" - SSW 930-0099
S&S CYCLE
MSRP: $17.95Now: $16.16Was: $17.95Base gasket failure can compromise your entire engine sealing system, leading to oil leaks and loss of compression at the worst possible moments. S&S Cycle's Pro-Formance micropore compound is engineered to withstand extreme pressures and temperatures...09345021- SKU:
- 09345021
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE IMPERIAL:
- 4.125'
- FEATURES:
- S&S BOLT PATTERN
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,46 MM (0,018')
- THICKNESS IMPERIAL:
- 0,018'
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- THICKNESS METRIC:
- 0.46 MM
MSRP: $17.95Now: $16.16Was: $17.95 -
On Sale
S&S CYCLE Top Rubber Washer 50-7015-12
S&S CYCLE
MSRP: $15.95Now: $14.36Was: $15.95Rocker box screw seals are critical wear items that prevent oil seepage and maintain proper gasket compression on your engine's top end. Over time, factory washers degrade from heat cycling and vibration, leading to leaks that compromise performance and...09345030- SKU:
- 09345030
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER COVER
- UNITS:
- 10 PACK
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
MSRP: $15.95Now: $14.36Was: $15.95 -
On Sale
S&S CYCLE Gaskets - 3-5/8" - Shovelhead 930-0089
S&S CYCLE
MSRP: $72.95Now: $65.66Was: $72.95A quality head gasket is the foundation of a reliable, high-compression engine. The S&S Cycle 3-5/8" gasket for Shovelhead applications combines premium materials with precision engineering to seal consistently under extreme combustion pressures—critical...09345017- SKU:
- 09345017
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 3,625'
- MATERIAL:
- COPPER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- BORE SIZE IMPERIAL:
- 3.625'
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
MSRP: $72.95Now: $65.66Was: $72.95
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.
