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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JAMES GASKET Mainshaft Oil Seal Cork 35231-36
JAMES GASKET
$11.70A leaking mainshaft oil seal can lead to catastrophic engine damage and loss of performance on the track or street. The JAMES GASKET Mainshaft Oil Seal Cork 35231-36 is engineered to maintain a...DS174892- SKU:
- DS174892
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- TYPE:
- MAINSHAFT
- UNITS:
- 10 PACK
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
$11.70 -
On Sale
JAMES GASKET Oil Pump Cover O-ring 10966
JAMES GASKET
Now: $5.00Was: $7.70A properly sealed oil pump cover is critical to maintaining system pressure and preventing costly leaks that compromise engine performance. The JAMES GASKET Oil Pump Cover O-ring (10966) delivers...09346488- SKU:
- 09346488
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- O-RING
- TYPE:
- OIL PUMP COVER
- UNITS:
- EACH
Now: $5.00Was: $7.70 -
On Sale
COMETIC Complete Gasket Kit - Evo C9846F
COMETIC
MSRP: $356.95Now: $321.26Was: $356.95A complete gasket kit eliminates the risk of installing mismatched or substandard gaskets across your engine—a common source of leaks and performance loss that can compromise reliability under boost...09340799- SKU:
- 09340799
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- BORE SIZE:
- 3,500'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.76 MM
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE IMPERIAL:
- 3.500'
- UNITS:
- KIT
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
MSRP: $356.95Now: $321.26Was: $356.95 -
On Sale
COMETIC Motor Gasket Kit - 1200 XL - .030" C9855F
COMETIC
MSRP: $202.60Now: $182.34Was: $202.60A complete gasket failure can leave you stranded or worse—cost you a race. The COMETIC Motor Gasket Kit for 1200 XL engines uses premium materials engineered to seal under extreme pressure and...09340800- SKU:
- 09340800
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
- BORE SIZE:
- 3,500'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,030'
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
MSRP: $202.60Now: $182.34Was: $202.60Qty in Cart: 0Quantity:Price:MSRP: $202.60Now: $182.34Was: $202.60Subtotal: -
On Sale
COMETIC Complete Gasket Kit - 1200 XL C9757F
COMETIC
MSRP: $265.60Now: $239.04Was: $265.60A failed gasket can cost you race time, engine damage, and thousands in repairs. The COMETIC Complete Gasket Kit C9757F eliminates guesswork by delivering OEM-quality sealing across your entire 1200...09340805- SKU:
- 09340805
- Availability:
- Ships Same Business Day
- Weight:
- 1.60 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- TYPE:
- COMPLETE
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- UNITS:
- KIT
MSRP: $265.60Now: $239.04Was: $265.60 -
On Sale
COMETIC Complete Gasket Kit - Softail C9184
COMETIC
MSRP: $287.65Now: $258.89Was: $287.65A complete gasket kit engineered for reliability and sealed performance—critical when you're pushing your Softail to its limits. OEM gaskets wear out, leak, and compromise compression; Cometic's...09341229- SKU:
- 09341229
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- BORE SIZE IMPERIAL:
- 3.875'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
- UNITS:
- KIT
- MATERIAL:
- STEEL
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,875'
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
MSRP: $287.65Now: $258.89Was: $287.65 -
On Sale
COMETIC Top End Gasket Kit - M8 C10217
COMETIC
MSRP: $240.40Now: $216.36Was: $240.40A failed head gasket can sideline your engine for weeks and cost thousands in repairs. The COMETIC Top End Gasket Kit C10217 eliminates the guesswork with a complete, matched set of EST (Extreme...09346323- SKU:
- 09346323
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.937'
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE SIZE:
- 3,937'
- PRODUCT NAME:
- GASKET
MSRP: $240.40Now: $216.36Was: $240.40Qty in Cart: 0Quantity:Price:MSRP: $240.40Now: $216.36Was: $240.40Subtotal: -
On Sale
COMETIC Top End Gasket Kit - M8 C10223
COMETIC
MSRP: $240.40Now: $216.36Was: $240.40A failed top-end gasket doesn't just waste your time—it compromises engine integrity and leaves you stranded. The COMETIC M8 C10223 gasket kit uses Extreme Sealing Technology to eliminate hot spots...09346325- SKU:
- 09346325
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- BORE SIZE:
- 4,250'
- BORE SIZE IMPERIAL:
- 4.250'
- RIDING STYLE:
- STREET
MSRP: $240.40Now: $216.36Was: $240.40 -
On Sale
COMETIC Motor Gasket Kit - M8 C10250
COMETIC
MSRP: $267.70Now: $240.93Was: $267.70Engine gasket failure can cost you race time and money. The COMETIC M8 C10250 Motor Gasket Kit uses EST (Extreme Sealing Technology) to eliminate hot spots and uneven heat distribution that...09346326- SKU:
- 09346326
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE SIZE:
- 3,937'
- BORE SIZE IMPERIAL:
- 3.937'
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $267.70Now: $240.93Was: $267.70Qty in Cart: 0Quantity:Price:MSRP: $267.70Now: $240.93Was: $267.70Subtotal: -
On Sale
COMETIC Pushrod Cover Seals C9598
COMETIC
Now: $6.30Was: $7.00Pushrod cover leaks compromise engine sealing integrity and create messy, unreliable conditions under the hood. The COMETIC C9598 Pushrod Cover Seals kit supplies OEM-quality seals and O-rings...09344713- SKU:
- 09344713
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- 25 PACK
- RIDING STYLE:
- STREET
- TYPE:
- PUSHROD COVER
Now: $6.30Was: $7.00 -
On Sale
COMETIC Head Gasket - .040" - Twin Cam C9726
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A quality head gasket is fundamental to maintaining cylinder pressure and preventing coolant/oil cross-contamination—failures here cascade into catastrophic engine damage. The COMETIC C9726 MLS...09340003- SKU:
- 09340003
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- BORE SIZE:
- 4,000'
- PRODUCT NAME:
- GASKET
- MATERIAL:
- LAYERED STEEL
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
MSRP: $61.90Now: $55.71Was: $61.90 -
On Sale
COMETIC Engine Gasket Kit - Iron XL C9051F
COMETIC
MSRP: $176.35Now: $158.72Was: $176.35A complete gasket kit is the foundation of a reliable, leak-free engine build. Factory gaskets degrade under heat and pressure—COMETIC's engineered solutions use purpose-built materials for each...09344800- SKU:
- 09344800
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- BORE SIZE IMPERIAL:
- 3.1875'
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- UNITS:
- KIT
- BORE SIZE:
- 3,1875'
- RIDING STYLE:
- STREET
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
MSRP: $176.35Now: $158.72Was: $176.35 -
On Sale
EASTERN MOTORCYCLE PARTS Bearing Retaining Washer - .065" - Big Twin A-35131-80
EASTERN MOTORCYCLE PARTS
Now: $19.66Was: $21.60Bearing retaining washers are critical wear items that prevent axial movement and maintain proper bearing preload in your transmission. Over time, these washers degrade from constant friction and...DS194179- SKU:
- DS194179
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- STYLE:
- 4-SPEED
- THICKNESS METRIC:
- 1.65 MM
- THICKNESS:
- 1,65 MM (0,065')
- TYPE:
- BEARING RETAINING
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,065'
- TYPE:
- MAINSHAFT
- UNITS:
- 5 PACK
Now: $19.66Was: $21.60 -
On Sale
EASTERN MOTORCYCLE PARTS Bearing Retaining Washer - 0.070" - Big Twin A-35131-81
EASTERN MOTORCYCLE PARTS
Now: $19.66Was: $21.60Bearing retaining washers are critical wear items in 4-speed Big Twin transmissions—they maintain precise bearing preload and prevent costly internal damage from excessive play. If you're...DS194181- SKU:
- DS194181
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- STYLE:
- 4-SPEED
- THICKNESS:
- 1,78 MM (0,070')
- THICKNESS IMPERIAL:
- 0.070'
- THICKNESS METRIC:
- 1.78 MM
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- TYPE:
- MAINSHAFT
- UNITS:
- 5 PACK
- TYPE:
- BEARING RETAINING
Now: $19.66Was: $21.60 -
On Sale
EASTERN MOTORCYCLE PARTS Main Shaft Thrust Washer - XL A-35326-SET
EASTERN MOTORCYCLE PARTS
MSRP: $56.95Now: $51.82Was: $56.95Main shaft thrust washers are critical for controlling axial play and preventing catastrophic bearing wear in high-performance motorcycle engines. Worn or missing thrust washers allow excessive...DS194183- SKU:
- DS194183
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- STYLE:
- 4-SPEED
- UNITS:
- SET OF 15
- PRODUCT NAME:
- THRUST WASHER
- RIDING STYLE:
- STREET
- TYPE:
- MAINSHAFT
- MOUNTING POSITION:
- RIGHT SIDE
- THICKNESS:
- 0,76 MM - 3,18 MM (0,030' - 0,125')
- THICKNESS IMPERIAL:
- 0,030' - 0,125'
- THICKNESS METRIC:
- 0.76 MM - 3.18 MM
MSRP: $56.95Now: $51.82Was: $56.95 -
On Sale
EASTERN MOTORCYCLE PARTS Countershaft Thrust Washer - XL A-35840-SET
EASTERN MOTORCYCLE PARTS
MSRP: $22.95Now: $20.88Was: $22.95First-gear thrust washers experience constant pressure during acceleration and shifting, making them a critical wear item that directly affects powertrain longevity and smooth engagement. Original...DS194187- SKU:
- DS194187
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,65 MM - 2,54 MM (0,065' - 0,100')
- MOUNTING POSITION:
- FIRST GEAR
- PRODUCT NAME:
- THRUST WASHER
- THICKNESS IMPERIAL:
- 0,065' - 0,100'
- UNITS:
- SET
- STYLE:
- 4-SPEED
- THICKNESS METRIC:
- 1.65 MM - 2.54 MM
- TYPE:
- COUNTERSHAFT
MSRP: $22.95Now: $20.88Was: $22.95 -
On Sale
EASTERN MOTORCYCLE PARTS Countershaft Thrust Washer - XL A-35848-SET
EASTERN MOTORCYCLE PARTS
MSRP: $14.95Now: $13.60Was: $14.95First gear thrust washers are critical wear items that directly impact your countershaft longevity and shifting precision. Over time, these washers compress and degrade, leading to excessive play,...DS194188- SKU:
- DS194188
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- THRUST WASHER
- UNITS:
- SET
- MOUNTING POSITION:
- FIRST GEAR
- STYLE:
- 4-SPEED
- THICKNESS METRIC:
- 1.19 MM - 2.03 MM
- TYPE:
- COUNTERSHAFT
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,19 MM - 2,03 MM (0,047' - 0,080')
- THICKNESS IMPERIAL:
- 0,047' - 0,080'
MSRP: $14.95Now: $13.60Was: $14.95Qty in Cart: 0Quantity:Price:MSRP: $14.95Now: $13.60Was: $14.95Subtotal: -
On Sale
S&S CYCLE Gasket Set - 3.5" - V2 Big Twin 90-1905
S&S CYCLE
MSRP: $75.95Now: $69.87Was: $75.95Proper sealing is non-negotiable when rebuilding or refreshing your Big Twin engine—failed gaskets lead to oil leaks, compression loss, and costly damage. The S&S Cycle Gasket Set gives you...09340325- SKU:
- 09340325
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- TYPE:
- EXHAUST
- UNITS:
- SET
MSRP: $75.95Now: $69.87Was: $75.95 -
RICK'S MOTORSPORT ELECTRIC Stator Gasket - Buell 25-003
RICK'S MOTORSPORT ELECTRIC
$15.95A failing stator cover gasket compromises your electrical system's reliability and invites oil seepage that damages internal components. This OEM-equivalent replacement restores a proper seal,...09344730- SKU:
- 09344730
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- TYPE:
- STATOR COVER
$15.95 -
REVOLUTION PERFORMANCE, LLC Gasket Kit - Twin Cam RP9902
REVOLUTION PERFORMANCE, LLC
$89.95A quality gasket kit is non-negotiable for any Twin Cam engine rebuild or top-end refresh. The RP9902 ensures proper sealing across all critical surfaces, preventing oil leaks and combustion blow-by...09347156- SKU:
- 09347156
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
$89.95
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.
