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 Valve Guide C9419-4
COMETIC
Now: $8.00Was: $8.90Valve guides are critical to maintaining proper valve stem clearance and preventing catastrophic engine wear. The COMETIC Valve Guide C9419-4 delivers precision-engineered tolerance control that ensures consistent combustion chamber sealing across the...09344702- SKU:
- 09344702
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,79 MM (0,031')
- TYPE:
- VALVE GUIDE
- UNITS:
- 4 PACK
- MATERIAL:
- FIBER
- THICKNESS IMPERIAL:
- 0,031'
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
Now: $8.00Was: $8.90Qty in Cart: 0Quantity:Price:Now: $8.00Was: $8.90Subtotal: -
On Sale
COMETIC Cylinder Base Gasket C9893
COMETIC
MSRP: $28.30Now: $27.00Was: $28.30A degraded cylinder base gasket compromises compression, invites coolant seepage, and forces you into the shop for emergency repairs. The COMETIC Cylinder Base Gasket C9893 delivers OEM-grade sealing for Sportster engines, ensuring consistent compression...09344725- SKU:
- 09344725
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- BORE SIZE IMPERIAL:
- 3.8125'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
MSRP: $28.30Now: $27.00Was: $28.30 -
On Sale
COMETIC Filter/Carb Gasket C9304
COMETIC
Now: $12.00Was: $12.70Carb and filter gasket integrity directly impacts fuel atomization and engine efficiency—any leakage compromises both performance and reliability. The COMETIC C9304 eliminates guesswork with a precision-engineered design that maintains a consistent seal...09342018- SKU:
- 09342018
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- CARBURETOR BACKING PLATE
- THICKNESS:
- 1,52 MM (0,060')
- THICKNESS IMPERIAL:
- 0.060'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
Now: $12.00Was: $12.70 -
On Sale
COMETIC Gasket C9196F5
COMETIC
Now: $28.00Was: $30.10High-temperature engine gaskets demand precision sealing without compromise. The COMETIC C9196F5 Viton gasket delivers exceptional chemical resistance and durability across a broad temperature range, making it ideal for forced induction builds, racing...09343175- SKU:
- 09343175
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MOUNTING POSITION:
- UPPER
- MATERIAL:
- SILICONE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- ROCKER COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
Now: $28.00Was: $30.10 -
On Sale
COMETIC Head Gasket - 3.875" x .030" C10081-030
COMETIC
MSRP: $59.80Now: $56.00Was: $59.80A quality head gasket is non-negotiable for engine reliability and performance—it's the critical seal that prevents combustion blow-by and coolant leaks under extreme pressure and temperature. The COMETIC C10081-030 uses multi-layer steel construction...09343143- SKU:
- 09343143
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE:
- 3,875'
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 3.875'
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
- UNITS:
- PAIR
MSRP: $59.80Now: $56.00Was: $59.80 -
On Sale
COMETIC Head Gasket - 3.875" x .040" C10081-040
COMETIC
MSRP: $59.80Now: $56.00Was: $59.80A quality head gasket is the foundation of a reliable engine seal—one leak can compromise compression, efficiency, and power output. The COMETIC C10081-040 uses Multi-Layer Steel (MLS) construction with Load Control Embossments to distribute clamping...09343144- SKU:
- 09343144
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- BORE SIZE IMPERIAL:
- 3.875'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
- THICKNESS IMPERIAL:
- 0,040'
- BORE SIZE:
- 3,875'
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
MSRP: $59.80Now: $56.00Was: $59.80 -
On Sale
COMETIC Head Gasket - 3.937"x .040" C10083-040
COMETIC
MSRP: $59.80Now: $56.00Was: $59.80A head gasket is your engine's first line of defense against combustion pressure, coolant leaks, and oil seepage—and choosing the right one directly impacts reliability and performance. The COMETIC C10083-040 MLS design distributes clamping load evenly...09343146- SKU:
- 09343146
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- BORE SIZE:
- 3,937'
- BORE SIZE IMPERIAL:
- 3.937'
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
MSRP: $59.80Now: $56.00Was: $59.80 -
On Sale
COMETIC Head Gasket - 4.060" x .040" C10085-040
COMETIC
MSRP: $59.80Now: $56.00Was: $59.80A head gasket failure can cost you an engine, and a poor seal costs you power—neither option is acceptable on the track or in your build. The COMETIC C10085-040 uses advanced MLS construction with Load Control Embossments to maintain even clamping...09343150- SKU:
- 09343150
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE IMPERIAL:
- 4.060'
- MATERIAL:
- VITON
- BORE SIZE:
- 4,060'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
MSRP: $59.80Now: $56.00Was: $59.80 -
On Sale
COMETIC Head Gasket - 4.160" x .030" C10087-030
COMETIC
MSRP: $59.80Now: $56.00Was: $59.80A head gasket is your engine's critical seal against combustion pressure, coolant leaks, and oil contamination—failure here means catastrophic engine damage. The COMETIC C10087-030 uses multi-layer steel construction with load control embossments to...09343153- SKU:
- 09343153
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- BORE SIZE IMPERIAL:
- 4.160'
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- BORE SIZE:
- 4,160'
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
MSRP: $59.80Now: $56.00Was: $59.80 -
On Sale
COMETIC Head Gasket - 4.250" x .030" C10088-030
COMETIC
MSRP: $59.80Now: $56.00Was: $59.80A head gasket failure can derail your entire engine build, costing you time and money on the track or in the shop. The COMETIC C10088-030 MLS head gasket delivers reliable sealing across demanding racing applications with precision-engineered...09343155- SKU:
- 09343155
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE SIZE:
- 4,250'
- BORE SIZE IMPERIAL:
- 4.250'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
- UNITS:
- PAIR
- MATERIAL:
- VITON
- THICKNESS:
- 0,76 MM (0,030')
- TYPE:
- CYLINDER HEAD
- THICKNESS IMPERIAL:
- 0,030'
MSRP: $59.80Now: $56.00Was: $59.80 -
On Sale
COMETIC Engine Gasket Kit - Big Twin C10091
COMETIC
MSRP: $141.70Now: $133.00Was: $141.70A complete gasket kit failure can leave your engine leaking, contaminated, or completely sidelined. The COMETIC C10091 Big Twin Engine Gasket Kit uses purpose-engineered materials—from Multi-Layer Steel head gaskets to Viton-coated base gaskets—ensuring...09344068- SKU:
- 09344068
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- MATERIAL:
- STEEL
- TYPE:
- MOTOR
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
MSRP: $141.70Now: $133.00Was: $141.70 -
On Sale
COMETIC Complete Gasket Kit - Softail C9221
COMETIC
MSRP: $209.95Now: $197.00Was: $209.95A complete gasket failure can sideline your Softail and cost you thousands in engine damage. The COMETIC Complete Gasket Kit C9221 eliminates guesswork by delivering OEM-quality sealing across your entire engine in one comprehensive package. Built with...09341657- SKU:
- 09341657
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- MATERIAL:
- STEEL
- UNITS:
- KIT
- MATERIAL:
- VITON
- TYPE:
- COMPLETE
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
MSRP: $209.95Now: $197.00Was: $209.95 -
On Sale
COMETIC Complete Gasket Kit - FXD C9221-030
COMETIC
MSRP: $209.95Now: $197.00Was: $209.95A complete gasket kit eliminates the guesswork when rebuilding or refreshing your FXD engine—you get every seal you need in one purchase, eliminating multiple orders and potential fitment mismatches. Cometic's multi-layer construction and Viton coatings...09341658- SKU:
- 09341658
- Availability:
- Ships Same Business Day
- Weight:
- 1.81 LBS
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- VITON
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- RIDING STYLE:
- STREET
MSRP: $209.95Now: $197.00Was: $209.95 -
On Sale
COMETIC Complete Gasket Kit - FL C9222-030
COMETIC
MSRP: $209.95Now: $197.00Was: $209.95A complete gasket kit eliminates the guesswork of sourcing individual sealing components—and prevents costly leaks that compromise engine reliability and performance. COMETIC's FL C9222-030 delivers OEM-quality sealing across every critical junction,...09341660- SKU:
- 09341660
- Availability:
- Ships Same Business Day
- Weight:
- 1.71 LBS
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
- MATERIAL:
- VITON
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
MSRP: $209.95Now: $197.00Was: $209.95 -
On Sale
COMETIC Top End Gasket - Twin Cam - 4-1/8" C9976
COMETIC
MSRP: $150.10Now: $141.00Was: $150.10If you're rebuilding a Twin Cam top end, a failed gasket can cost you serious downtime and money. The COMETIC C9976 eliminates guesswork by delivering a complete, precision-engineered gasket kit with proven heat management technology—so you seal it right...09341662- SKU:
- 09341662
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- MATERIAL:
- RUBBER
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- KIT
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- TYPE:
- TOP END
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 0.51 MM
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS IMPERIAL:
- 0,040'
MSRP: $150.10Now: $141.00Was: $150.10 -
On Sale
COMETIC Carb Back Plate Gasket C9626F
COMETIC
Now: $13.00Was: $13.50A carburetor back plate gasket is a critical seal that prevents fuel and air leaks between your carb and intake manifold—leaks that kill performance and create safety hazards. The COMETIC C9626F eliminates the guesswork with its proven aluminum Foamette...09341342- SKU:
- 09341342
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- CARBURETOR BACKING PLATE
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 10 PACK
- THICKNESS:
- 1,52 MM (0,060')
Now: $13.00Was: $13.50 -
On Sale
COMETIC Filter Mount Gasket C9634F
COMETIC
Now: $13.00Was: $13.90A reliable filter mount gasket is critical to maintaining a sealed intake system and preventing vacuum leaks that degrade performance and fuel economy. The COMETIC C9634F uses a proven aluminum foamette design that eliminates the need for messy gasket...09341343- SKU:
- 09341343
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- AIR FILTER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- TYPE:
- BACKPLATE
- UNITS:
- 10 PACK
Now: $13.00Was: $13.90Qty in Cart: 0Quantity:Price:Now: $13.00Was: $13.90Subtotal: -
On Sale
COMETIC Rear Tapped Gasket - Big Twin C9297F
COMETIC
Now: $5.00Was: $5.30A properly sealed engine is the foundation of reliable performance, and Cometic's rear tapped gasket eliminates the weak point where your Big Twin crankcase meets the transmission. This precision-engineered gasket prevents oil weeping and maintains...09341351- SKU:
- 09341351
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- THICKNESS:
- 0,81 MM (0,032')
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- TYPE:
- TAPPET GUIDE
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,032'
- THICKNESS METRIC:
- 0.81 MM
Now: $5.00Was: $5.30 -
On Sale
COMETIC Front Tappet Gasket - Big Twin C9298F
COMETIC
Now: $6.00Was: $6.40The COMETIC Front Tappet Gasket is engineered to eliminate oil seepage at the tappet cover, a common failure point on Big Twin engines. A compromised gasket leads to messy leaks, potential oil starvation, and costly engine damage—this OEM-quality...09341352- SKU:
- 09341352
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- TYPE:
- TAPPET GUIDE
- UNITS:
- 10 PACK
- THICKNESS METRIC:
- 0.81 MM
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- FRONT
- THICKNESS IMPERIAL:
- 0,032'
Now: $6.00Was: $6.40 -
On Sale
COMETIC Head Gasket - .03" - Evo - 3.75" C9694
COMETIC
MSRP: $61.90Now: $58.00Was: $61.90A quality head gasket is critical to maintaining cylinder pressure, preventing coolant and oil leakage, and preserving engine reliability under boost or high RPM conditions. The COMETIC .03" MLS design uses Load Control Embossments to distribute clamping...09341353- SKU:
- 09341353
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.750'
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE:
- 3,750'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,76 MM (0,030')
- TYPE:
- CYLINDER HEAD
MSRP: $61.90Now: $58.00Was: $61.90Qty in Cart: 0Quantity:Price:MSRP: $61.90Now: $58.00Was: $61.90Subtotal:
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.
