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
-
On Sale
COMETIC Head Gasket - .04" - 3 13/16" C9693
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A head gasket failure will cost you far more in downtime and engine damage than the price of a quality replacement. The Cometic C9693 uses multi-layer steel construction with load control embossments to maintain consistent clamping force across the...09341356- SKU:
- 09341356
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 1,02 MM (0,040')
- BORE SIZE:
- 3,8125'
- BORE SIZE IMPERIAL:
- 3.8125'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- UNITS:
- PAIR
- THICKNESS METRIC:
- 1.02 MM
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Rocker Gasket - .020" C9576
COMETIC
Now: $59.00Was: $62.70Rocker arm gaskets endure constant thermal cycling and high RPM loads—degradation here leads to oil seepage, reduced sealing integrity, and potential engine damage. The COMETIC C9576 delivers superior durability through its Viton elastomer construction,...09340750- SKU:
- 09340750
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- TYPE:
- ROCKER BOX
- THICKNESS METRIC:
- 0.51 MM
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS:
- 0,51 MM (0,020')
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
Now: $59.00Was: $62.70Qty in Cart: 0Quantity:Price:Now: $59.00Was: $62.70Subtotal: -
On Sale
COMETIC Primary Gasket C9943F5
COMETIC
Now: $78.00Was: $83.50A primary gasket is critical to maintaining a sealed, leak-free engine case—especially under high RPM and boost conditions where pressure spikes demand absolute reliability. COMETIC's C9943F5 delivers the durability and precision fit that professional...09340747- SKU:
- 09340747
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY
- THICKNESS:
- 1,52 MM (0,060')
- UNITS:
- 5 PACK
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
Now: $78.00Was: $83.50 -
On Sale
COMETIC Inspection Cover Gasket - FL C9305F5
COMETIC
Now: $24.00Was: $25.60A leaking inspection cover gasket compromises engine sealing and invites contaminant ingress—exactly what your engine doesn't need. The COMETIC C9305F5 delivers OEM-grade sealing integrity with the precision fit your application demands. Made in the U.S...20111494- SKU:
- 20111494
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- INSPECTION COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
Now: $24.00Was: $25.60 -
On Sale
COMETIC Top End Gasket Twin Cam - EST C9976-030
COMETIC
MSRP: $150.10Now: $141.00Was: $150.10A failed top-end gasket can sideline your engine and drain your wallet. The COMETIC EST C9976-030 eliminates guesswork by delivering a complete, purpose-built gasket kit engineered to handle sustained combustion pressures and thermal cycling without...09341663- SKU:
- 09341663
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS IMPERIAL:
- 0,030'
- TYPE:
- TOP END
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- THICKNESS METRIC:
- 0.76 MM
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 0.51 MM
- MATERIAL:
- RUBBER
- UNITS:
- KIT
MSRP: $150.10Now: $141.00Was: $150.10 -
On Sale
COMETIC Head Gasket - 4.000" x .030" C10084-030
COMETIC
MSRP: $59.80Now: $56.00Was: $59.80A properly sealed combustion chamber is non-negotiable for consistent power delivery and engine longevity. COMETIC's MLS head gasket design minimizes bore distortion through load-control embossments, ensuring reliable sealing across demanding boost...09343147- SKU:
- 09343147
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BORE SIZE:
- 4,000'
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- TYPE:
- CYLINDER HEAD
MSRP: $59.80Now: $56.00Was: $59.80Qty in Cart: 0Quantity:Price:MSRP: $59.80Now: $56.00Was: $59.80Subtotal: -
On Sale
COMETIC Head Gasket - 4.060" x .030" C10085-030
COMETIC
MSRP: $59.80Now: $56.00Was: $59.80A head gasket failure can cost you thousands in engine damage and lost track time. COMETIC's MLS design distributes clamping force evenly across the sealing surface, reducing bore distortion and maximizing ring seal for consistent power delivery. Built...09343149- SKU:
- 09343149
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 4,060'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 4.060'
- THICKNESS IMPERIAL:
- 0,030'
MSRP: $59.80Now: $56.00Was: $59.80 -
On Sale
COMETIC Head Gasket - 4.125" x .040" C10086-040
COMETIC
MSRP: $59.80Now: $56.00Was: $59.80A quality head gasket is the foundation of reliable cylinder sealing and consistent compression. The COMETIC C10086-040 delivers precision engineering with its multi-layer steel construction, designed to maintain a tight seal across demanding racing and...09343152- SKU:
- 09343152
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 4.125'
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,125'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,02 MM (0,040')
- UNITS:
- PAIR
MSRP: $59.80Now: $56.00Was: $59.80 -
On Sale
COMETIC Top End Gasket Kit - Buell C10111
COMETIC
MSRP: $142.75Now: $134.00Was: $142.75A top-end rebuild demands precision gaskets that can withstand extreme combustion pressures and thermal cycling without failure. The COMETIC C10111 kit eliminates the guesswork by delivering factory-spec gaskets engineered to manage heat distribution and...09344732- SKU:
- 09344732
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- GASKET KIT
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $142.75Now: $134.00Was: $142.75 -
On Sale
COMETIC Primary Gasket C9309F5
COMETIC
Now: $113.00Was: $120.50A primary gasket is critical to maintaining a sealed, leak-free crankcase in high-performance engines where internal pressures and temperature fluctuations demand absolute reliability. The COMETIC C9309F5 is engineered to withstand sustained RPM and...20111488- SKU:
- 20111488
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,52 MM (0,060')
- MOUNTING POSITION:
- OUTER
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY COVER
Now: $113.00Was: $120.50 -
On Sale
COMETIC Primary Gasket C9145F1
COMETIC
MSRP: $46.15Now: $43.00Was: $46.15Primary gasket failures compromise engine sealing and lead to costly leaks and performance loss. Cometic's AFM gasket technology delivers superior heat resistance and shape recovery, ensuring reliable sealing on high-output engines without requiring...09341205- SKU:
- 09341205
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
MSRP: $46.15Now: $43.00Was: $46.15 -
On Sale
COMETIC Exhaust Gasket - Tapered C9288
COMETIC
Now: $36.00Was: $38.00A failing exhaust gasket compromises both performance and reliability, allowing heat and pressure to escape where they shouldn't. The COMETIC C9288 tapered design seals precisely at the flange interface, eliminating leaks across the full operating range...09341337- SKU:
- 09341337
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- GRAPHITE
- RIDING STYLE:
- STREET
- MATERIAL:
- STAINLESS STEEL
- TYPE:
- EXHAUST
- UNITS:
- 10 PACK
Now: $36.00Was: $38.00Qty in Cart: 0Quantity:Price:Now: $36.00Was: $38.00Subtotal: -
On Sale
COMETIC Primary Gasket Kit C9889
COMETIC
MSRP: $101.80Now: $96.00Was: $101.80A primary gasket kit failure means oil leaks, performance loss, and costly downtime. The COMETIC C9889 eliminates these risks with AFM gaskets engineered for extreme heat and pressure, delivering reliable sealing that holds torque cycle after cycle...09340744- SKU:
- 09340744
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
MSRP: $101.80Now: $96.00Was: $101.80 -
EASTERN MOTORCYCLE PARTS Countershaft Thrust Washer - XL A-35327-SET
EASTERN MOTORCYCLE PARTS
$47.95First gear thrust washers endure extreme loads during acceleration and gear engagement, making them a critical wear item in high-demand riding conditions. Over time, these washers compress and degrade, leading to increased play in the countershaft and...DS194184- SKU:
- DS194184
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MOUNTING POSITION:
- FIRST GEAR
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
- THICKNESS:
- 0,51 MM - 1,91 MM (0,020' - 0,075')
- THICKNESS IMPERIAL:
- 0,020' - 0,075'
- TYPE:
- COUNTERSHAFT
- PRODUCT NAME:
- THRUST WASHER
- THICKNESS METRIC:
- 0.51 MM - 1.91 MM
- UNITS:
- SET
$47.95 -
On Sale
COMETIC Head Gasket - 4"- .040" C9880
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A head gasket failure can sideline your engine and drain your wallet—this is where precision engineering becomes non-negotiable. The COMETIC C9880 uses Multi-Layer Steel (MLS) construction with Load Control Embossments to distribute clamping force evenly...09340010- SKU:
- 09340010
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE:
- 4,000'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Head Gasket - SSW - +4.125" - .027" C9930
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A head gasket is your engine's first line of defense against combustion blow-by and coolant leakage—and compromising on quality here invites catastrophic failure. The COMETIC SSW Head Gasket is engineered to withstand extreme pressures and temperatures...09340031- SKU:
- 09340031
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BORE SIZE IMPERIAL:
- 4.125'
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.69 MM
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- BORE SIZE:
- 4,125'
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,69 MM (0,027')
- THICKNESS IMPERIAL:
- 0,027'
- UNITS:
- PAIR
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Head Gasket SSW+4.125.030 C9931
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A head gasket failure can cost you race time and credibility on the track. The COMETIC SSW+4.125.030 delivers the seal integrity and thermal stability you need to keep combustion pressure where it belongs—inside the cylinder. Built from premium...09340032- SKU:
- 09340032
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.76 MM
- UNITS:
- PAIR
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Head Gasket - SSW - +4.125" - .036" C9932
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A head gasket is the critical seal between your engine block and cylinder head—any compromise in material quality directly impacts combustion efficiency, coolant integrity, and overall engine reliability. The COMETIC SSW head gasket is engineered from...09340033- SKU:
- 09340033
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.91 MM
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,91 MM (0,036')
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 4,125'
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,036'
MSRP: $61.90Now: $58.00Was: $61.90 -
On Sale
COMETIC Head Gasket - SSW - +4.125" - .040" C9933
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A head gasket failure can end your race day or sideline your project build indefinitely. The COMETIC SSW Head Gasket delivers the sealing reliability required for high-boost and high-rpm applications, engineered to resist fuel degradation, thermal...09340034- SKU:
- 09340034
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 4,125'
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- MATERIAL:
- LAYERED STEEL
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
MSRP: $61.90Now: $58.00Was: $61.90Qty in Cart: 0Quantity:Price:MSRP: $61.90Now: $58.00Was: $61.90Subtotal: -
On Sale
COMETIC Base Gasket - +4.125" - .020" C9936
COMETIC
MSRP: $33.55Now: $32.00Was: $33.55A precision base gasket is critical to maintaining boost pressure integrity and preventing coolant/oil seepage in high-performance applications. The COMETIC C9936 combines a stainless steel core with dual Viton rubber coatings to deliver the reliability...09340036- SKU:
- 09340036
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- CYLINDER BASE
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- RIDING STYLE:
- STREET
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
MSRP: $33.55Now: $32.00Was: $33.55
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.
