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 Engine Gasket Kit - Big Twin C9154
COMETIC
MSRP: $246.70Now: $232.00Was: $246.70Engine gasket failure can compromise seal integrity and lead to costly leaks or catastrophic engine damage. The COMETIC C9154 Big Twin gasket kit delivers OEM-quality sealing with race-grade materials engineered to handle extreme combustion pressures and...09344663- SKU:
- 09344663
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.625'
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- TYPE:
- COMPLETE
- UNITS:
- KIT
- BORE SIZE:
- 3,625'
- PRODUCT NAME:
- GASKET KIT
MSRP: $246.70Now: $232.00Was: $246.70 -
On Sale
COMETIC Cylinder Base Gasket C9206
COMETIC
MSRP: $33.55Now: $32.00Was: $33.55A failing cylinder base gasket compromises combustion seal integrity, leading to oil weeping, pressure loss, and potential engine damage. The COMETIC C9206 delivers OEM-grade sealing reliability with premium materials engineered to handle Sportster...09344664- SKU:
- 09344664
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- MATERIAL:
- VITON
- TYPE:
- CYLINDER BASE
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
MSRP: $33.55Now: $32.00Was: $33.55 -
On Sale
COMETIC Cylinder Base Gasket C9207
COMETIC
MSRP: $33.55Now: $32.00Was: $33.55A failed cylinder base gasket compromises compression, invites coolant and oil contamination, and can leave you stranded mid-season. The COMETIC C9207 is engineered to seal reliably under the extreme pressures and temperature cycling that Sportster...09344665- SKU:
- 09344665
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.625'
- THICKNESS IMPERIAL:
- 0,020'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS METRIC:
- 0.51 MM
MSRP: $33.55Now: $32.00Was: $33.55 -
On Sale
COMETIC Timing Cover Gasket C9306
COMETIC
Now: $8.00Was: $8.90A failing timing cover gasket compromises your engine's oil containment and invites contamination into critical engine components. The COMETIC C9306 is precision-engineered to seal reliably under high heat and pressure, protecting your investment and...09344666- SKU:
- 09344666
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- THICKNESS IMPERIAL:
- 0,031'
- TYPE:
- POINT COVER
- UNITS:
- 10 PACK
- THICKNESS METRIC:
- 0.79 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,79 MM (0,031')
- MATERIAL:
- FIBER
- TYPE:
- IGNITION COVER
Now: $8.00Was: $8.90 -
On Sale
COMETIC Starter Motor Gasket C9312
COMETIC
Now: $6.00Was: $6.10A leaking starter motor gasket compromises engine sealing integrity and can lead to oil weepage that damages electrical components. The COMETIC C9312 delivers OEM-equivalent sealing performance with superior durability, ensuring your starter assembly...09344667- SKU:
- 09344667
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- MOTOR
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- MATERIAL:
- FIBER
- TYPE:
- STATOR
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
Now: $6.00Was: $6.10 -
On Sale
COMETIC Cam Gear Gasket - XL C9316F1
COMETIC
MSRP: $18.85Now: $18.00Was: $18.85A failing cam gear gasket compromises oil sealing at one of the most critical junctures in your engine—leading to oil seepage, contamination, and potential bearing damage. The COMETIC Cam Gear Gasket XL C9316F1 delivers OEM-grade sealing with superior...09344668- SKU:
- 09344668
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- CAM COVER
- UNITS:
- EACH
MSRP: $18.85Now: $18.00Was: $18.85 -
On Sale
COMETIC Circuit Breaker Gasket C9337
COMETIC
MSRP: $4.15Now: $4.00Was: $4.20Gasket failure can sideline your engine faster than any other component—and racing demands zero tolerance for leaks. The COMETIC Circuit Breaker Gasket C9337 delivers a proven solution with its aluminum core construction and bonded nitrile rubber...09344685- SKU:
- 09344685
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- THICKNESS IMPERIAL:
- 0,032'
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CIRCUIT BREAKER COVER
MSRP: $4.15Now: $4.00Was: $4.20 -
On Sale
COMETIC Rocker Cover Gasket - Big Twin C9342-125F
COMETIC
MSRP: $81.85Now: $77.00Was: $81.85A leaking rocker cover gasket compromises engine performance and creates maintenance headaches. This COMETIC gasket delivers a reliable, lasting seal using premium materials engineered to withstand high heat and pressure cycles. If you're rebuilding a...09344686- SKU:
- 09344686
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- THICKNESS:
- 3,20 MM (0,125')
- TYPE:
- ROCKER ARM
- UNITS:
- PAIR
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,125'
- MATERIAL:
- FIBER
- THICKNESS METRIC:
- 3.20 MM
MSRP: $81.85Now: $77.00Was: $81.85Qty in Cart: 0Quantity:Price:MSRP: $81.85Now: $77.00Was: $81.85Subtotal: -
On Sale
COMETIC Rocker Cover Gasket - Big Twin C9346
COMETIC
Now: $17.00Was: $17.90A leaking rocker cover gasket compromises engine sealing and invites oil contamination into your intake tract—exactly what your Big Twin doesn't need. The COMETIC C9346 delivers a precision seal using a stainless steel core with dual Viton rubber...09344687- SKU:
- 09344687
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- FELT
- THICKNESS:
- 3,20 MM (0,125')
- TYPE:
- ROCKER COVER
- THICKNESS METRIC:
- 3.20 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,125'
- UNITS:
- 10 PACK
Now: $17.00Was: $17.90 -
On Sale
COMETIC Oil Pump Cover Gasket C9385
COMETIC
Now: $9.00Was: $9.50Oil leaks at the pump cover can compromise engine cleanliness and cost you reliability on the track or street. The COMETIC Oil Pump Cover Gasket C9385 delivers a precision seal using advanced elastomer materials designed to withstand sustained high-RPM...09344688- SKU:
- 09344688
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MOUNTING POSITION:
- OUTER
- PRODUCT NAME:
- GASKET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- MATERIAL:
- FIBER
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS METRIC:
- 0.25 MM
- THICKNESS IMPERIAL:
- 0,010'
Now: $9.00Was: $9.50 -
On Sale
COMETIC Oil Pump Cover Gasket C9388
COMETIC
Now: $10.00Was: $10.60An oil pump cover gasket is critical to maintaining system integrity—any leak here compromises oil pressure, circulation, and engine longevity. The COMETIC C9388 delivers factory-grade sealing with precision engineering, eliminating weeping and ensuring...09344690- SKU:
- 09344690
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MOUNTING POSITION:
- INNER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- MATERIAL:
- FIBER
- THICKNESS METRIC:
- 0.25 MM
- THICKNESS IMPERIAL:
- 0,010'
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- THICKNESS:
- 0,25 MM (0,010')
Now: $10.00Was: $10.60 -
On Sale
COMETIC Oil Pump Cover Gasket C9389
COMETIC
Now: $9.00Was: $9.50An oil pump cover gasket is a critical sealing component that prevents oil leakage at the pump cover interface, protecting your engine from loss of lubrication and contamination. COMETIC's C9389 gasket delivers reliable sealing performance with precision...09344691- SKU:
- 09344691
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- MATERIAL:
- FIBER
- MOUNTING POSITION:
- OUTER
- THICKNESS METRIC:
- 0.25 MM
Now: $9.00Was: $9.50 -
On Sale
COMETIC Oil Pump Cover Gasket C9390
COMETIC
Now: $7.00Was: $7.40An oil pump cover gasket is a critical sealing component that prevents pressurized oil from leaking past the pump housing, which can lead to catastrophic engine damage if left unchecked. COMETIC's C9390 is engineered to withstand extreme pressure cycles...09344692- SKU:
- 09344692
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- THICKNESS IMPERIAL:
- 0,010'
- MATERIAL:
- FIBER
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS METRIC:
- 0.25 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
Now: $7.00Was: $7.40Qty in Cart: 0Quantity:Price:Now: $7.00Was: $7.40Subtotal: -
On Sale
COMETIC Oil Pump Cover Gasket C9391
COMETIC
Now: $6.00Was: $6.40An oil pump cover gasket is a critical seal that prevents pressurized oil leakage at the pump housing—a common failure point in high-performance engines running elevated RPMs and boost levels. COMETIC's C9391 delivers reliable sealing with premium...09344693- SKU:
- 09344693
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- MATERIAL:
- FIBER
- THICKNESS METRIC:
- 0.25 MM
Now: $6.00Was: $6.40 -
On Sale
COMETIC Oil Pump Cover Gasket C9392
COMETIC
Now: $10.00Was: $10.60An oil pump cover gasket failure can quickly turn into catastrophic engine damage, making this component a critical maintenance item for any serious racer or mechanic. The COMETIC C9392 provides the reliable sealing performance you need to prevent leaks...09344694- SKU:
- 09344694
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- THICKNESS IMPERIAL:
- 0,010'
- MATERIAL:
- FIBER
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS METRIC:
- 0.25 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
Now: $10.00Was: $10.60 -
On Sale
COMETIC Oil Pump Cover Gasket C9393
COMETIC
Now: $6.00Was: $6.70An oil pump cover gasket is critical to maintaining a sealed, leak-free oil system—any seepage compromises lubrication efficiency and can lead to costly engine damage. The COMETIC C9393 is engineered to OEM specifications, ensuring reliable sealing under...09344695- SKU:
- 09344695
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- MATERIAL:
- FIBER
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS METRIC:
- 0.25 MM
- THICKNESS IMPERIAL:
- 0,010'
Now: $6.00Was: $6.70 -
On Sale
COMETIC Oil Pump Cover Gasket C9394
COMETIC
Now: $6.00Was: $6.40An oil pump cover gasket is critical for maintaining a sealed oil circulation system—any leak compromises lubrication efficiency and can lead to catastrophic engine damage. The COMETIC C9394 is engineered to withstand high-pressure cycles and thermal...09344696- SKU:
- 09344696
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- THICKNESS IMPERIAL:
- 0,010'
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- THICKNESS:
- 0,25 MM (0,010')
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- MATERIAL:
- FIBER
- THICKNESS METRIC:
- 0.25 MM
Now: $6.00Was: $6.40 -
On Sale
COMETIC Oil Pump Cover Gasket C9399
COMETIC
Now: $7.00Was: $7.40An oil pump cover gasket is a critical sealing component that prevents oil leakage at the pump housing, maintaining proper lubrication pressure and protecting your engine from costly internal damage. The COMETIC C9399 is engineered with precision...09344698- SKU:
- 09344698
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- THICKNESS IMPERIAL:
- 0,031'
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- THICKNESS METRIC:
- 0.79 MM
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- MATERIAL:
- FIBER
- THICKNESS:
- 0,79 MM (0,031')
Now: $7.00Was: $7.40 -
On Sale
COMETIC Pushrod Cover Seals C9408-25
COMETIC
Now: $12.00Was: $12.70A leaking pushrod cover gasket compromises oil containment and can lead to engine bay mess and potential performance issues. The COMETIC Pushrod Cover Seals C9408-25 delivers OEM-grade sealing components engineered to eliminate leaks and maintain proper...09344700- SKU:
- 09344700
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- 25 PACK
- TYPE:
- PUSHROD COVER
Now: $12.00Was: $12.70 -
On Sale
COMETIC Pushrod Cover Seals C9409-25
COMETIC
Now: $12.00Was: $12.70Pushrod cover seals are critical wear items that deteriorate over time, leading to oil seepage and potential engine damage if ignored. The COMETIC C9409-25 seal kit provides OEM-specification replacements engineered to maintain a reliable seal under high...09344701- SKU:
- 09344701
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- 25 PACK
- RIDING STYLE:
- STREET
- TYPE:
- PUSHROD COVER
- PRODUCT NAME:
- GASKET
Now: $12.00Was: $12.70
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.
