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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On Sale
S&S CYCLE Base Gaskets - 80" 930-0095
S&S CYCLE
MSRP: $20.95Now: $17.96Was: $20.95Base gasket failure can compromise your entire engine assembly, leading to costly rebuilds and downtime. S&S Cycle's Pro-Formance micropore compound is engineered to withstand extreme cylinder pressures and temperature cycling without extrusion or...09345023- SKU:
- 09345023
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- THICKNESS:
- 0,46 MM (0,018')
- THICKNESS METRIC:
- 0.46 MM
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- FEATURES:
- STOCK BOLT PATTERN
- THICKNESS IMPERIAL:
- 0,018'
- TYPE:
- CYLINDER BASE
MSRP: $20.95Now: $17.96Was: $20.95 -
On Sale
S&S CYCLE Gasket Kit - 3-5/8" 106-0992
S&S CYCLE
MSRP: $251.95Now: $215.96Was: $251.95A quality gasket kit is essential for maintaining cylinder head integrity and preventing oil/coolant leaks that compromise engine performance and reliability. The S&S CYCLE 3-5/8" gasket kit delivers OEM-level sealing with the precision fit your build...09345027- SKU:
- 09345027
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.625'
- FEATURES:
- FOR '84 - '99 EVOLUTION-STYLE BIG TWIN
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $251.95Now: $215.96Was: $251.95 -
On Sale
S&S CYCLE Top Rocker Box Washer 50-7015
S&S CYCLE
MSRP: $7.30Now: $6.26Was: $7.30Proper rocker box sealing is critical to maintaining oil containment and preventing leaks that compromise engine performance. This S&S replacement washer ensures a reliable, lasting seal on your rocker box fasteners, eliminating the risk of oil weeping...09345029- SKU:
- 09345029
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- UNITS:
- EACH
- MATERIAL:
- RUBBER
- TYPE:
- ROCKER BOX
MSRP: $7.30Now: $6.26Was: $7.30 -
On Sale
S&S CYCLE Gaskets - 3.927" - Twin Cam 900-0605
S&S CYCLE
MSRP: $87.10Now: $74.66Was: $87.10A head gasket failure means catastrophic engine damage and downtime you can't afford. S&S Cycle gaskets use premium aramid fiber-reinforced graphite with a steel core to withstand extreme combustion pressures and temperature cycles that lesser gaskets...09345031- SKU:
- 09345031
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE:
- 3,927'
- BORE SIZE IMPERIAL:
- 3.927'
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0.030'
- THICKNESS METRIC:
- 0.76 MM
- MATERIAL:
- STEEL
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
MSRP: $87.10Now: $74.66Was: $87.10 -
On Sale
S&S CYCLE Tapered Exhaust Gasket 106-5029
S&S CYCLE
MSRP: $9.40Now: $8.06Was: $9.40A proper exhaust seal is critical to maintaining peak engine performance and preventing power-robbing leaks at the cylinder head. The S&S CYCLE Tapered Exhaust Gasket is engineered specifically for Evolution Big Twin models with spherical exhaust ports,...09345077- SKU:
- 09345077
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- UNITS:
- EACH
- TYPE:
- EXHAUST
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
MSRP: $9.40Now: $8.06Was: $9.40 -
On Sale
S&S CYCLE Air Cleaner Backplate Gasket 106-2328
S&S CYCLE
MSRP: $43.00Now: $36.86Was: $43.00A properly sealed air cleaner system is critical to maintaining consistent fuel mapping and preventing unwanted air leaks that compromise engine performance. The S&S Cycle Air Cleaner Backplate Gasket 106-2328 ensures a reliable seal between your air...09344760- SKU:
- 09344760
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- STYLE:
- SUPER E
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- STYLE:
- SUPER G
- PRODUCT NAME:
- GASKET
- TYPE:
- BACKPLATE
MSRP: $43.00Now: $36.86Was: $43.00 -
On Sale
S&S CYCLE Oil Pump Gasket Kit 31-6271
S&S CYCLE
MSRP: $17.95Now: $16.16Was: $17.95A leaking oil pump gasket will compromise your engine's oil pressure and lead to catastrophic bearing damage. The S&S Cycle Oil Pump Gasket Kit 31-6271 delivers OEM-quality sealing with precision-cut gaskets that eliminate weeping and maintain consistent...DS194246- SKU:
- DS194246
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PUMP
- RIDING STYLE:
- STREET
- UNITS:
- KIT
MSRP: $17.95Now: $16.16Was: $17.95 -
On Sale
S&S CYCLE Rocker Box Gasket Kit 90-4097
S&S CYCLE
MSRP: $152.20Now: $130.46Was: $152.20Engine oil leaks from worn rocker box gaskets don't just create a mess on your garage floor—they compromise engine sealing integrity and can lead to costly internal damage if left unaddressed. The S&S Cycle Rocker Box Gasket Kit 90-4097 delivers...09342216- SKU:
- 09342216
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- UNITS:
- KIT
MSRP: $152.20Now: $130.46Was: $152.20 -
On Sale
S&S CYCLE Gaskets 3.5" (.045) 930-0098
S&S CYCLE
MSRP: $53.50Now: $45.86Was: $53.50A head gasket is your engine's critical seal—the barrier between combustion chambers and coolant passages that determines whether your build holds together under peak boost or falls apart at the strip. S&S Cycle's gaskets eliminate guesswork with aramid...09345009- SKU:
- 09345009
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- MICROPORE COMPOUND
- THICKNESS METRIC:
- 1.14 MM
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- THICKNESS:
- 1,14 MM (0,045')
- THICKNESS IMPERIAL:
- 0.045'
- TYPE:
- CYLINDER HEAD
MSRP: $53.50Now: $45.86Was: $53.50 -
On Sale
S&S CYCLE Gaskets - 4" - Twin Cam 930-0090
S&S CYCLE
MSRP: $48.25Now: $41.36Was: $48.25A reliable head gasket is foundational to engine integrity—it prevents combustion blow-by, coolant leakage, and catastrophic failure under high boost or sustained load. S&S Cycle's gaskets combine military-grade materials with precision engineering to...09345013- SKU:
- 09345013
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.168 MM
- UNITS:
- PAIR
- BORE SIZE:
- 4,000'
- MATERIAL:
- GRAPHITE
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,168 MM (0,046')
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS IMPERIAL:
- 0,046'
- TYPE:
- CYLINDER HEAD
MSRP: $48.25Now: $41.36Was: $48.25 -
On Sale
S&S CYCLE GASKET SET 4.25" M8 17+ 900-0955
S&S CYCLE
MSRP: $169.95Now: $152.96Was: $169.95A quality gasket set is the foundation of a reliable engine build—it seals critical combustion chambers and prevents fluid leaks that can compromise performance and longevity. The S&S Cycle 4.25" gasket set is engineered for M8 Harley-Davidson engines...09347174- SKU:
- 09347174
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE IMPERIAL:
- 4.250'
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
MSRP: $169.95Now: $152.96Was: $169.95Qty in Cart: 0Quantity:Price:MSRP: $169.95Now: $152.96Was: $169.95Subtotal: -
On Sale
S&S CYCLE Cam Cover Gasket - M8 310-0911
S&S CYCLE
MSRP: $23.05Now: $19.76Was: $23.05A worn or deteriorating cam cover gasket compromises engine sealing and invites oil leakage—a common issue that worsens over time on M8 platforms. This OEM-specification gasket from S&S Cycle ensures a reliable seal, preventing costly oil seepage and...09345874- SKU:
- 09345874
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- CAM COVER
- UNITS:
- EACH
MSRP: $23.05Now: $19.76Was: $23.05 -
On Sale
S&S CYCLE Base Gaskets - 4" 930-0094
S&S CYCLE
MSRP: $16.75Now: $14.36Was: $16.75Proper base gasket selection is critical to preventing coolant and oil leaks that compromise engine integrity and performance. S&S Cycle's Pro-Formance micropore compound is engineered to withstand extreme combustion pressures and temperature cycling...09345022- SKU:
- 09345022
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 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:
- 4.000'
- FEATURES:
- STOCK BOLT PATTERN
- THICKNESS METRIC:
- 0.46 MM
MSRP: $16.75Now: $14.36Was: $16.75Qty in Cart: 0Quantity:Price:MSRP: $16.75Now: $14.36Was: $16.75Subtotal: -
On Sale
S&S CYCLE HVHP Oil Pump Gasket Kit 31-6299
S&S CYCLE
MSRP: $15.95Now: $14.36Was: $15.95An oil pump gasket kit is essential maintenance for any high-performance big-twin engine—it prevents oil seepage that compromises engine reliability and performance. S&S Cycle's HVHP gasket kit delivers OEM-quality sealing with precision-engineered...316299- SKU:
- 316299
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- TYPE:
- OIL PUMP
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- STREET
MSRP: $15.95Now: $14.36Was: $15.95 -
On Sale
S&S CYCLE Lower End Gasket Kit 31-2066
S&S CYCLE
MSRP: $71.95Now: $64.76Was: $71.95A reliable lower end gasket kit is foundational to engine longevity and peak performance. S&S Cycle's 31-2066 kit delivers OEM-quality sealing that prevents oil leakage and maintains compression integrity across the entire power band. Whether you're...312066- SKU:
- 312066
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- TYPE:
- LOWER END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- FEATURES:
- FOR S&S SUPER STOCK '70 - '91 BIG TWIN
- RIDING STYLE:
- STREET
MSRP: $71.95Now: $64.76Was: $71.95Qty in Cart: 0Quantity:Price:MSRP: $71.95Now: $64.76Was: $71.95Subtotal: -
On Sale
S&S CYCLE Lower End Gasket Kit - Super Side Winder Plus 31-2068
S&S CYCLE
MSRP: $63.95Now: $57.56Was: $63.95A leaking lower end gasket kit will compromise your engine's integrity and cost you performance on the track or trail. The S&S Cycle Lower End Gasket Kit delivers OEM-quality sealing with premium materials engineered to withstand extreme combustion...312068- SKU:
- 312068
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- TYPE:
- LOWER END
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- BORE SIZE:
- 4,125'
- UNITS:
- KIT
MSRP: $63.95Now: $57.56Was: $63.95 -
On Sale
S&S CYCLE Back Plate Gasket - E/G 106-1724
S&S CYCLE
MSRP: $9.40Now: $8.06Was: $9.40A quality back plate gasket is critical for maintaining a reliable seal between your engine's back plate and block—any leakage here compromises oil retention and can lead to costly internal damage. The S&S Cycle Back Plate Gasket is engineered to OEM...10101735- SKU:
- 10101735
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,0625'
- STYLE:
- SUPER G
- TYPE:
- BACKPLATE
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- STYLE:
- SUPER E
- THICKNESS:
- 1,59 MM (0,0625')
- THICKNESS METRIC:
- 1.59 MM
MSRP: $9.40Now: $8.06Was: $9.40 -
On Sale
S&S CYCLE Top End Gasket - 4-1/8" - Evo 90-9506
S&S CYCLE
MSRP: $116.95Now: $105.26Was: $116.95A quality top-end gasket is critical to maintaining cylinder head sealing and preventing costly oil or coolant leaks that compromise engine performance. This S&S Cycle gasket is engineered to the exacting tolerances required for Evo big-twin engines,...909506- SKU:
- 909506
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
MSRP: $116.95Now: $105.26Was: $116.95 -
On Sale
S&S CYCLE Replacement Gaskets 31-6273
S&S CYCLE
MSRP: $17.95Now: $16.16Was: $17.95Engine gaskets are the critical seals that prevent oil, coolant, and combustion leaks—and worn gaskets compromise performance and reliability. S&S Cycle's replacement gaskets are engineered to OEM specifications, ensuring a perfect fit and lasting...DS194064- SKU:
- DS194064
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- OIL PUMP
MSRP: $17.95Now: $16.16Was: $17.95 -
On Sale
S&S CYCLE U-Ring - 40-42 mm 16-0242
S&S CYCLE
MSRP: $43.00Now: $36.86Was: $43.00A proper seal between your intake manifold and engine is non-negotiable for consistent performance and reliability. The S&S Cycle U-Ring ensures a leak-free connection that maintains optimal air-fuel mixture delivery, preventing performance loss and...09340666- SKU:
- 09340666
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- INTAKE MANIFOLD
- THICKNESS METRIC:
- 40 MM - 42 MM
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- THICKNESS:
- 40 MM - 42 MM
MSRP: $43.00Now: $36.86Was: $43.00
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.
