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
-
JAMES GASKET Exhaust Port Gasket 17048-98
JAMES GASKET
$16.95A failing exhaust port gasket compromises both performance and reliability, allowing exhaust gases to escape where they shouldn't and creating unnecessary heat loss. The JAMES GASKET Exhaust Port Gasket 17048-98 delivers a precision seal that maintains...DS173220- SKU:
- DS173220
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- STREET
$16.95 -
JAMES GASKET Head/Base Gasket Kit - Twin Cam 17047-98
JAMES GASKET
$78.95Gasket failure leads to oil leaks, compression loss, and catastrophic engine damage—especially in high-performance Twin Cam applications where heat and pressure are unforgiving. The JAMES GASKET Head/Base Gasket Kit eliminates guesswork by pairing...DS173219- SKU:
- DS173219
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- STANDARD
- THICKNESS IMPERIAL:
- -
- TYPE:
- CYLINDER HEAD
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- -
- MATERIAL:
- -
- STYLE:
- STANDARD BORE
$78.95 -
JAMES GASKET Rocker Cover Gasket Kit - Twin Cam 17033-99
JAMES GASKET
$81.95A worn rocker cover gasket is one of the most common sources of oil leaks in Twin Cam engines—and the JAMES GASKET Rocker Cover Gasket Kit eliminates that problem before it starts. This U.S.A.-made kit delivers reliable sealing geometry that matches OEM...DS173218- SKU:
- DS173218
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- ROCKER BOX
- UNITS:
- KIT
$81.95 -
JAMES GASKET Rocker Housing Gasket - Twin Cam 16719-99
JAMES GASKET
$29.95A failing rocker housing gasket compromises engine sealing and invites oil leakage that degrades performance and creates maintenance headaches. JAMES GASKET's Twin Cam design uses precision engineering and domestic manufacturing to deliver a dependable...DS173215- SKU:
- DS173215
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- PRODUCT NAME:
- GASKET
- FEATURES:
- BEADED
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- UNITS:
- PAIR
$29.95 -
COMETIC Rocker Gasket - EST - XL C9764
COMETIC
$65.05Rocker box gaskets experience constant thermal cycling and oil exposure, making them prone to failure and costly leaks if not properly sealed. The COMETIC Rocker Gasket EST XL C9764 delivers a complete, OEM-quality gasket kit engineered to eliminate...DS172076- SKU:
- DS172076
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- UNITS:
- KIT
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- MODEL:
- EST
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$65.05 -
COMETIC Top End Gasket Kit - XL1200 - EST C9763
COMETIC
$142.75A top-end rebuild demands gaskets engineered to handle extreme combustion pressures and temperature cycling without compromise. The COMETIC EST C9763 kit eliminates the risk of catastrophic gasket failure by actively dissipating heat away from the...DS172075- SKU:
- DS172075
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- BORE SIZE:
- 3,500'
- DISPLACEMENT:
- 1200 CC
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.500'
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- TOP END
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$142.75 -
COMETIC Top End Gasket Kit - XL1100 - EST C9761
COMETIC
$142.75A top-end rebuild demands gasket integrity that won't compromise under sustained combustion pressures and thermal cycling. COMETIC's EST (Extreme Sealing Technology) kit eliminates hot spots and premature failure through engineered heat dissipation,...DS172073- SKU:
- DS172073
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- MATERIAL:
- STAINLESS STEEL
- THICKNESS METRIC:
- 0.51 MM
- BORE SIZE:
- 3,350'
- DISPLACEMENT:
- 1100 CC
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.350'
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- THICKNESS IMPERIAL:
- 0,020'
$142.75Qty in Cart: 0Quantity:Price:$142.75Subtotal: -
COMETIC Top End Gasket Kit - XL883 - EST C9760
COMETIC
$142.75A top-end rebuild demands precision sealing to prevent combustion gas leakage and coolant loss—failures that compromise power delivery and engine longevity. COMETIC's EST gasket kit eliminates hot spots through advanced thermal management, ensuring even...DS172072- SKU:
- DS172072
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE IMPERIAL:
- 3.000'
- DISPLACEMENT:
- 883 CC
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,000'
- MATERIAL:
- RUBBER
- TYPE:
- TOP END
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$142.75 -
COMETIC Rocker Gasket - EST - Big Twin C9753
COMETIC
$65.05Rocker box gasket failures lead to oil leaks, engine contamination, and costly downtime—especially on high-mileage or frequently serviced Big Twin motors. The COMETIC Rocker Gasket EST (C9753) eliminates guesswork with a complete, US-manufactured gasket...DS172065- SKU:
- DS172065
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- UNITS:
- KIT
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- MODEL:
- EST
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$65.05 -
COMETIC Rocker Box Gasket - XL C9066
COMETIC
$47.20Rocker box gaskets are critical sealing points in any engine—failure here means oil leakage, contamination, and potential engine damage. The COMETIC Rocker Box Gasket Kit (C9066) eliminates guesswork by bundling every seal, gasket, and O-ring you need to...DS172059- SKU:
- DS172059
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- MODEL:
- EST
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- MATERIAL:
- PAPER
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$47.20 -
COMETIC Rocker Box Gasket C9078
COMETIC
$47.20Rocker box gasket failure compromises engine sealing and invites oil leakage that accelerates wear on critical valve train components. The COMETIC C9078 delivers OEM-grade sealing with premium materials engineered for extended service intervals,...DS172057- SKU:
- DS172057
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- MODEL:
- EST
- TYPE:
- ROCKER BOX
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
$47.20Qty in Cart: 0Quantity:Price:$47.20Subtotal: -
COMETIC Base Gasket 3-5/8" - EVO/XL C9555
COMETIC
$33.55A properly sealed cylinder base is non-negotiable for reliable horsepower and engine longevity. The COMETIC C9555 delivers a precision gasket engineered to withstand the combustion pressures and thermal cycling that stock gaskets simply can't handle...DS172054- SKU:
- DS172054
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.625'
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- TYPE:
- CYLINDER BASE
$33.55 -
COMETIC Metal Base Gasket - EVO/XL C9553
COMETIC
$33.55A failed base gasket doesn't just leak—it compromises your engine's structural integrity and forces oil past critical sealing surfaces. The COMETIC Metal Base Gasket C9553 is engineered to handle the thermal cycling and vibration that standard gaskets...DS172053- SKU:
- DS172053
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BORE SIZE IMPERIAL:
- STANDARD
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,51 MM (0,020')
- UNITS:
- PAIR
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.51 MM
- TYPE:
- CYLINDER BASE
- THICKNESS IMPERIAL:
- 0,020'
$33.55 -
COMETIC Base Gasket - 3-5/8" - EVO/Big Twin C9552
COMETIC
$33.55A properly sealed cylinder base is non-negotiable for reliable engine performance and longevity. The COMETIC C9552 base gasket delivers OEM-quality sealing on your EVO or Big Twin, preventing coolant and oil leakage that can compromise engine integrity...DS172052- SKU:
- DS172052
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE SIZE IMPERIAL:
- 3.625'
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.51 MM
- TYPE:
- CYLINDER BASE
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
$33.55 -
COMETIC Metal Base Gasket - Big Twin C9551
COMETIC
$33.55A quality base gasket is critical to maintaining cylinder seal integrity and preventing oil leakage that compromises performance and engine longevity. The COMETIC Metal Base Gasket C9551 delivers the durability and precision fit that Big Twin Sportster...DS172051- SKU:
- DS172051
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- THICKNESS METRIC:
- 0.51 MM
- TYPE:
- CYLINDER BASE
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- RIDING STYLE:
- STREET
$33.55 -
COMETIC Copper Base Gasket - XL C9025
COMETIC
$17.80A quality head gasket is the foundation of reliable cylinder sealing—without it, you're risking compression loss, coolant leaks, and catastrophic engine failure. The COMETIC Copper Base Gasket delivers precision engineering with MLS (Multi-Layer Steel)...DS172050- SKU:
- DS172050
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- TYPE:
- CYLINDER BASE
- MATERIAL:
- COPPER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$17.80 -
COMETIC Left Rocker Box Gasket - Big Twin C9562
COMETIC
$20.10Rocker box gasket failures can lead to oil seepage, engine contamination, and costly downtime. The COMETIC Left Rocker Box Gasket (C9562) is engineered with a stainless steel core and precision Viton rubber coating to provide a reliable, long-lasting...DS172048- SKU:
- DS172048
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,010'
- TYPE:
- ROCKER COVER
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- MOUNTING POSITION:
- LEFT
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS METRIC:
- 0.25 MM
$20.10 -
COMETIC Rocker Box Gasket Kit - Twin Cam C9588
COMETIC
$46.15When you're servicing your Twin Cam rocker boxes, using OEM gaskets leaves you vulnerable to repeat failures and costly downtime. The COMETIC Rocker Box Gasket Kit C9588 eliminates guesswork by providing every seal, gasket, and O-ring you need in a...DS172013- SKU:
- DS172013
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- TYPE:
- ROCKER BOX
- MODEL:
- EST
- UNITS:
- KIT
$46.15Qty in Cart: 0Quantity:Price:$46.15Subtotal: -
COMETIC Right Lower Rocker Box Gasket C9560
COMETIC
$16.90Rocker box gasket failure leads to oil leakage, increased blowby, and potential engine damage—especially critical in high-performance applications where seal integrity directly impacts reliability. The COMETIC C9560 Right Lower Rocker Box Gasket uses a...DS172004- SKU:
- DS172004
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- THICKNESS IMPERIAL:
- 0,010'
- TYPE:
- ROCKER COVER
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- MATERIAL:
- VITON
- MOUNTING POSITION:
- LOWER
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS METRIC:
- 0.25 MM
$16.90 -
JAMES GASKET Inspection Gasket Metal/Rubber - Big Twin 60567-90-DL
JAMES GASKET
$9.95Inspection cover leaks compromise engine cleanliness and invite contaminant intrusion—a problem that compounds quickly in high-performance applications. The James Gasket Inspection Gasket delivers a factory-engineered seal with molded rubber construction...78081027- SKU:
- 78081027
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- FEATURES:
- BEADED
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- MATERIAL:
- STEEL
- STYLE:
- PRIMARY
- THICKNESS METRIC:
- 2.50 MM
- TYPE:
- INSPECTION COVER
- THICKNESS:
- 2,50 MM (0,100')
- THICKNESS IMPERIAL:
- 0,100'
- MATERIAL:
- RUBBER
$9.95
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.
