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 Engine/Primary Gasket Set C10269
COMETIC
$340.15A complete gasket set is foundational to engine reliability—without proper sealing, combustion pressure escapes, coolant leaks, and oil weeps compromise both performance and longevity. The COMETIC C10269 delivers multi-layer steel construction and...09346331- SKU:
- 09346331
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- RIDING STYLE:
- STREET
- TYPE:
- COMPLETE
- UNITS:
- KIT
- BORE SIZE:
- 3,937'
- PRODUCT NAME:
- GASKET
$340.15Qty in Cart: 0Quantity:Price:$340.15Subtotal: -
COMETIC Motor Gasket Kit - M8 C10256
COMETIC
$267.70A failed gasket kit can cost you a race and thousands in engine damage. The COMETIC M8 C10256 EST (Extreme Sealing Technology) kit eliminates hot spots and combustion leaks with precision-engineered stainless steel construction, ensuring reliable...09346328- SKU:
- 09346328
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- BORE SIZE IMPERIAL:
- 4.250'
- RIDING STYLE:
- STREET
- BORE SIZE:
- 4,250'
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$267.70 -
COMETIC Motor Gasket Kit - M8 C10252
COMETIC
$259.30A reliable motor gasket kit is the foundation of a bulletproof top-end rebuild. The COMETIC M8 C10252 uses Extreme Sealing Technology to eliminate hot spots and gasket failure—critical when you're pushing horsepower and demanding consistency run after...09346327- SKU:
- 09346327
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE SIZE IMPERIAL:
- 4.075'
- RIDING STYLE:
- STREET
- TYPE:
- COMPLETE
- BORE SIZE:
- 4,075'
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$259.30 -
COMETIC Exhaust Gasket - Evo/Twin Cam/M8 C9247
COMETIC
$46.00A failed exhaust gasket compromises engine sealing, reduces performance, and risks catastrophic damage under sustained boost or high RPM conditions. The COMETIC C9247 delivers proven reliability across Harley-Davidson Evo, Twin Cam, and M8 platforms with...09346318- SKU:
- 09346318
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- STREET
- TYPE:
- EXHAUST
- MATERIAL:
- GRAPHITE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
$46.00Qty in Cart: 0Quantity:Price:$46.00Subtotal: -
COMETIC Transmission/Engine Gasket C10214
COMETIC
$12.95Transmission and engine gasket integrity is non-negotiable when you're building a reliable power plant. The COMETIC C10214 delivers the seal quality that separates a bulletproof build from a leak-prone nightmare, using premium fuel-resistant materials...09345981- SKU:
- 09345981
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- TRANSMISSION
$12.95 -
COMETIC Cylinder Head Gasket C10191
COMETIC
$61.90A reliable cylinder head gasket is the foundation of a sealed combustion chamber—any compromise here means potential coolant leaks, oil seepage, and catastrophic engine failure. The COMETIC C10191 delivers the precision engineering and material science...09345951- SKU:
- 09345951
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- THICKNESS IMPERIAL:
- 0,040'
- MATERIAL:
- LAYERED STEEL
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- 2 PACK
- BORE SIZE:
- 4,250'
- BORE SIZE IMPERIAL:
- 4.250'
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Cylinder Head Gasket C10182-030
COMETIC
$61.90A quality cylinder head gasket is your engine's first line of defense against catastrophic coolant and combustion leaks. The COMETIC C10182-030 delivers the reliability you need with a precision-engineered design that handles extreme pressures,...09345949- SKU:
- 09345949
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE SIZE IMPERIAL:
- 4.320'
- RIDING STYLE:
- STREET
- MATERIAL:
- LAYERED STEEL
- PRODUCT NAME:
- GASKET
- UNITS:
- 2 PACK
- BORE SIZE:
- 4,320'
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
$61.90 -
COMETIC Cylinder Head/Base Gasket C10181-HB
COMETIC
$79.75A reliable cylinder head gasket is critical to maintaining compression integrity and preventing coolant/oil seepage—issues that compromise engine performance and longevity. The COMETIC C10181-HB uses Multi-Layer Steel (MLS) construction to deliver...09345945- SKU:
- 09345945
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- THICKNESS IMPERIAL:
- 0,014'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE:
- 4,250'
- MATERIAL:
- LAYERED STEEL
- THICKNESS METRIC:
- 0.36 MM
- THICKNESS:
- 0,36 MM (0,014')
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 4.250'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
$79.75 -
COMETIC Upper Rocker Box Gasket C10179-2
COMETIC
$26.20A leaking rocker box gasket means oil seepage, contamination risk, and potential engine damage—this COMETIC gasket seals the deal with precision engineering that withstands high heat and pressure cycles. Built with a stainless steel core and dual-sided...09345942- SKU:
- 09345942
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- MATERIAL:
- VITON
- MOUNTING POSITION:
- UPPER
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- UNITS:
- 2 PACK
- THICKNESS:
- 0,51 MM (0,020')
$26.20 -
COMETIC Upper Rocker Box Gasket C10179
COMETIC
$67.90Rocker box gaskets are critical sealing components that prevent oil leakage and maintain proper engine bay cleanliness on high-performance builds. The COMETIC C10179 combines a precision stainless steel core with durable Viton rubber facing to withstand...09345941- SKU:
- 09345941
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- MATERIAL:
- VITON
- TYPE:
- ROCKER BOX
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- MOUNTING POSITION:
- UPPER
- THICKNESS:
- 0,51 MM (0,020')
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
$67.90 -
COMETIC Cylinder Base Gasket Pair C10177-020
COMETIC
$33.55A quality cylinder base gasket is foundational to maintaining proper compression and preventing coolant seepage in high-demand engines. The COMETIC C10177-020 uses multi-layer steel construction with precision embossments to distribute clamping force...09345939- SKU:
- 09345939
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.51 MM
- UNITS:
- 2 PACK
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER BASE
- THICKNESS IMPERIAL:
- 0,020'
$33.55Qty in Cart: 0Quantity:Price:$33.55Subtotal: -
COMETIC Cylinder Head Gasket C10167
COMETIC
$61.90A cylinder head gasket is the critical seal between your engine block and cylinder head—any failure here means combustion leak, loss of compression, and potential engine damage. The COMETIC C10167 is engineered to handle extreme pressure, temperature...09345923- SKU:
- 09345923
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- LAYERED STEEL
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 4.145'
- MATERIAL:
- VITON
- THICKNESS IMPERIAL:
- 0,040'
- BORE SIZE:
- 4,145'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- 2 PACK
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Cylinder Head Gasket C10165
COMETIC
$61.90A cylinder head gasket is only as good as its ability to seal under extreme pressure and temperature swings—and the COMETIC C10165 is engineered to handle exactly that. Built with a stainless steel core and dual Viton-coated layers, this gasket maintains...09345918- SKU:
- 09345918
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- 2 PACK
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE:
- 4,000'
- TYPE:
- CYLINDER HEAD
$61.90 -
COMETIC Cylinder/Base Gasket C10164-HB-030
COMETIC
$81.85A quality cylinder/base gasket is non-negotiable when rebuilding an engine or replacing a failed seal—this is where catastrophic leaks start. The COMETIC C10164-HB-030 uses Multi-Layer Steel (MLS) construction with Viton®-coated embossed spring steel...09345917- SKU:
- 09345917
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- MATERIAL:
- LAYERED STEEL
- RIDING STYLE:
- OFF-ROAD
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- VITON
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE:
- 3,937'
- PRODUCT NAME:
- GASKET
- UNITS:
- 2 PACK
- BORE SIZE IMPERIAL:
- 3.937'
- THICKNESS:
- 0,76 MM (0,030')
$81.85 -
COMETIC Cylinder Head Gasket C10164-030
COMETIC
$61.90A proper cylinder head gasket is critical to maintaining combustion chamber seal integrity and preventing coolant or oil leakage under sustained load and temperature cycling. The COMETIC C10164-030 uses a multi-layer design with stainless steel...09345916- SKU:
- 09345916
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 3.937'
- THICKNESS IMPERIAL:
- 0,030'
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- BORE SIZE:
- 3,937'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 2 PACK
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Primary Gasket C10145F1
COMETIC
$33.55A primary gasket failure can leave you stranded and cost you race time or weekend plans. The COMETIC C10145F1 uses proprietary AFM material that combines an aluminum core with bonded synthetic rubber to deliver exceptional durability on machined...09345059- SKU:
- 09345059
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- PRIMARY COVER
$33.55Qty in Cart: 0Quantity:Price:$33.55Subtotal: -
COMETIC Derby Gasket C10140F1
COMETIC
$10.95A quality derby cover gasket is essential to maintaining a proper seal on your Harley Davidson's primary cover, preventing oil leakage and contamination that can compromise engine performance. The COMETIC Derby Gasket C10140F1 is engineered to OEM...09345057- SKU:
- 09345057
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- CLUTCH COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- DERBY COVER
- UNITS:
- EACH
$10.95 -
COMETIC Inner Push Pins Gasket C10122
COMETIC
$16.75Gasket misalignment during assembly can compromise your engine case seal and create costly leaks or performance issues down the line. The COMETIC Inner Push Pins Gasket ensures your inner primary and transmission-to-case gaskets stay precisely positioned...09344742- SKU:
- 09344742
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- TYPE:
- HOLDING PIN
- RIDING STYLE:
- STREET
$16.75 -
COMETIC Starter Motor Gasket C9333
COMETIC
$4.20A failing starter motor gasket compromises your engine's seal integrity and can lead to oil leaks, contamination, and costly internal damage. The COMETIC C9333 is engineered to provide a reliable, long-lasting seal that keeps oil where it belongs—inside...09344683- SKU:
- 09344683
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,31 MM (0,012')
- THICKNESS IMPERIAL:
- 0,012'
- MATERIAL:
- FIBER
- THICKNESS METRIC:
- 0.31 MM
- TYPE:
- CAM COVER
- UNITS:
- 10 PACK
$4.20 -
COMETIC Points Cover Gasket C9323
COMETIC
$8.90A leaking points cover gasket compromises engine sealing and invites contamination into your ignition system—exactly what you don't need when reliability matters. The COMETIC C9323 delivers OEM-quality sealing with the precision fit and material...09344678- SKU:
- 09344678
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- THICKNESS IMPERIAL:
- 0,031'
- UNITS:
- 10 PACK
- MATERIAL:
- FIBER
- THICKNESS:
- 0,79 MM (0,031')
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- TYPE:
- POINT COVER
$8.90
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.
