Harley Seals/Orings and Kits
Harley Bike Engine Seals, O-Rings & Kits at JJ Motorsports
Keep your Harley leak-free with premium Cometic seals and O-rings from JJ Motorsports, featuring Viton valve stem seals, pushrod tube O-rings, and crankcase seals for reliable performance on Twin Cam, Evo, Sportster, and Big Twin engines. These high-temp, oil-resistant components ensure perfect sealing and long-term durability.
Shop Cometic for race-proven quality. Explore related categories such as Harley engine for gaskets and rebuild kits, or Harley for cams and oil pumps to complete your engine refresh.
Top Harley Engine Seals & O-Rings
- Cometic Engine Crankcase Seal C9682 – High-quality main seal for Twin Cam and Evo crankcases; prevents oil leaks at the mainshaft.
- Cometic Valve Stem Seal Viton C9166 – Viton valve stem seals; heat- and oil-resistant for Big Twin and Sportster heads.
- Cometic Pushrod Tube O-Ring C9584 – Pushrod tube O-ring set; perfect seal between cylinder and rocker box on Evo and Twin Cam.
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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COMETIC Valve Stem Seal C9424-1
COMETIC
$5.00Valve stem seals are critical components that prevent oil from leaking past the valve guides and into the combustion chamber—a problem that leads to blue smoke, increased oil consumption, and accelerated wear on catalytic converters. The COMETIC C9424-1...09350835- SKU:
- 09350835
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
- MATERIAL:
- VITON
- OUTSIDE DIAMETER IMPERIAL:
- 0.625'
- TYPE:
- VALVE STEM
- RIDING STYLE:
- STREET
$5.00 -
On Sale
COMETIC Carb Backplate O-Ring C9686
COMETIC
MSRP: $6.25Now: $6.00Was: $6.25A worn or deteriorated carb backplate O-ring can cause fuel leaks, air leaks, and performance inconsistencies that compromise your engine's tuning. The COMETIC C9686 is engineered from premium fuel-resistant elastomer that maintains its integrity under...09350373- SKU:
- 09350373
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- CARBURETOR BACKING PLATE
- RIDING STYLE:
- STREET
- MATERIAL:
- NITRILE
- UNITS:
- 10 PACK
- PRODUCT NAME:
- O-RING
MSRP: $6.25Now: $6.00Was: $6.25Qty in Cart: 0Quantity:Price:MSRP: $6.25Now: $6.00Was: $6.25Subtotal: -
On Sale
COMETIC Valve Stem Seal C9153
COMETIC
Now: $71.00Was: $76.00Valve stem seals are critical to preventing oil from seeping into your combustion chambers—a problem that degrades performance, increases emissions, and accelerates engine wear. The COMETIC C9153 is engineered from premium fuel-resistant elastomers that...09350137- SKU:
- 09350137
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- RIDING STYLE:
- STREET
- TYPE:
- VALVE STEM
- MATERIAL:
- VITON
- UNITS:
- 25 PACK
- PRODUCT NAME:
- SEAL
Now: $71.00Was: $76.00Qty in Cart: 0Quantity:Price:Now: $71.00Was: $76.00Subtotal: -
On Sale
COMETIC Valve Stem Seal - Viton C9166
COMETIC
Now: $23.00Was: $24.20Valve stem seals are critical to preventing oil from seeping into your combustion chambers—a problem that degrades performance, increases emissions, and accelerates wear. The COMETIC Viton C9166 delivers the fuel-resistant durability and dimensional...09350138- SKU:
- 09350138
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- 10 PACK
- TYPE:
- VALVE STEM
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
Now: $23.00Was: $24.20Qty in Cart: 0Quantity:Price:Now: $23.00Was: $24.20Subtotal: -
On Sale
COMETIC Oil Pump Inner Small O-Ring C9449
COMETIC
Now: $7.00Was: $7.40A failing oil pump seal compromises lubrication pressure across your entire engine, risking catastrophic bearing wear and sudden failure. The COMETIC Oil Pump Inner Small O-Ring (C9449) is engineered from premium fuel-resistant elastomer that maintains...09350159- SKU:
- 09350159
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- APPLICATION:
- OIL PUMP
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
Now: $7.00Was: $7.40Qty in Cart: 0Quantity:Price:Now: $7.00Was: $7.40Subtotal: -
On Sale
COMETIC Derby Cover O-Ring - Big Twin C9662
COMETIC
Now: $14.00Was: $15.40The COMETIC Derby Cover O-Ring is engineered to prevent oil leakage and maintain proper crankcase sealing on your Big Twin—critical for consistent engine performance and longevity. Built from premium fuel-resistant elastomers, this O-ring resists the...09350160- SKU:
- 09350160
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- DERBY COVER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- O-RING
- UNITS:
- 5 PACK
- MATERIAL:
- NITRILE RUBBER
Now: $14.00Was: $15.40Qty in Cart: 0Quantity:Price:Now: $14.00Was: $15.40Subtotal: -
On Sale
COMETIC Cam Support O-Ring C9631
COMETIC
Now: $3.00Was: $3.20Cam support o-rings are critical sealing components that prevent oil leakage and maintain pressure integrity in your engine's cam cover assembly. A compromised o-ring leads to oil weeping, potential external leaks, and inconsistent valve train...09350165- SKU:
- 09350165
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- CAM SUPPORT
- UNITS:
- 10 PACK
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
Now: $3.00Was: $3.20Qty in Cart: 0Quantity:Price:Now: $3.00Was: $3.20Subtotal: -
On Sale
COMETIC EFI Map Senser Seal - Twin Cam C9630
COMETIC
Now: $12.00Was: $12.70Engine gasket seals demand absolute reliability—even minor fuel leakage or pressure loss compromises performance and risks engine damage. The Cometic EFI Map Sensor Seal (C9630) is engineered specifically for Twin Cam applications, eliminating the weak...09350166- SKU:
- 09350166
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- CAM MANIFOLD
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- MATERIAL:
- SILICONE
Now: $12.00Was: $12.70Qty in Cart: 0Quantity:Price:Now: $12.00Was: $12.70Subtotal: -
On Sale
COMETIC Umbrella Seal C9481
COMETIC
Now: $8.00Was: $8.40Umbrella seals are critical for preventing oil seepage and maintaining pressure integrity in high-performance engines, especially under sustained boost and elevated operating temperatures. The COMETIC C9481 is engineered with fuel-resistant elastomers...09350167- SKU:
- 09350167
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- MATERIAL:
- VITON
- APPLICATION:
- UMBRELLA VALVE
Now: $8.00Was: $8.40 -
On Sale
COMETIC O-Ring C9459
COMETIC
Now: $3.00Was: $3.20Cometic O-Ring seals are engineered to withstand extreme pressures and temperature fluctuations in high-performance applications where standard gaskets fail. Whether you're building a forced induction engine or restoring a precision machine, this U.S...09350170- SKU:
- 09350170
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- DIPSTICK COVER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- O-RING
- UNITS:
- 25 PACK
- APPLICATION:
- PUSHROD COVER
- MATERIAL:
- NITRILE RUBBER
Now: $3.00Was: $3.20Qty in Cart: 0Quantity:Price:Now: $3.00Was: $3.20Subtotal: -
On Sale
COMETIC Intake Manifold Seal Kit - Evolution C9131
COMETIC
MSRP: $14.95Now: $14.00Was: $14.95Intake manifold seal degradation creates vacuum leaks that compromise fuel mixture precision and reduce engine efficiency—problems that compound over time. The COMETIC Evolution C9131 kit delivers OEM-quality sealing with U.S.-manufactured components...09350172- SKU:
- 09350172
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- INTAKE MANIFOLD TO CARBURETOR
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- SEAL
MSRP: $14.95Now: $14.00Was: $14.95Qty in Cart: 0Quantity:Price:MSRP: $14.95Now: $14.00Was: $14.95Subtotal: -
On Sale
COMETIC Carb/Manifold Sealing Ring C9088
COMETIC
MSRP: $10.95Now: $10.00Was: $10.95Carburetor and manifold sealing rings are critical interfaces in your fuel system—a leak or deterioration here compromises air-fuel ratios and can cause fuel seepage into your engine bay. The COMETIC C9088 is engineered to eliminate these failure points...09350173- SKU:
- 09350173
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- FIBER
- APPLICATION:
- INTAKE MANIFOLD TO CARBURETOR
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- THICKNESS IMPERIAL:
- 0.031'
- UNITS:
- EACH
MSRP: $10.95Now: $10.00Was: $10.95 -
On Sale
COMETIC Derby Cover Bolt Washer C9363
COMETIC
MSRP: $5.20Now: $5.00Was: $5.20Derby cover bolt washers are a small but critical component that prevents fasteners from loosening due to vibration and thermal cycling—a common failure point in high-performance engines. The COMETIC C9363 delivers the reliability you need without the...09350177- SKU:
- 09350177
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- WASHER
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- APPLICATION:
- DERBY COVER
MSRP: $5.20Now: $5.00Was: $5.20 -
On Sale
COMETIC Starter Housing O-Ring Pack C9433
COMETIC
Now: $5.00Was: $5.30A leaking starter housing can compromise engine reliability and create costly downtime in the garage or on the track. COMETIC's O-ring pack delivers OEM-spec sealing with the durability to handle repeated thermal cycling and high-performance demands...09350179- SKU:
- 09350179
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- O-RING
- UNITS:
- 25 PACK
- RIDING STYLE:
- STREET
- APPLICATION:
- STARTER HOUSING
- MATERIAL:
- NITRILE RUBBER
Now: $5.00Was: $5.30 -
On Sale
COMETIC Starter Shaft Seal C9379
COMETIC
Now: $14.00Was: $14.80A leaking starter shaft seal compromises engine oil integrity and increases the risk of costly internal damage. The COMETIC C9379 Starter Shaft Seal delivers OEM-quality sealing performance with precise tolerances engineered to prevent oil weeping at the...09350181- SKU:
- 09350181
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- STARTER SHAFT
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
Now: $14.00Was: $14.80 -
On Sale
COMETIC Starter Shaft Seal C9509
COMETIC
Now: $16.00Was: $16.90A failing starter shaft seal compromises engine reliability and creates potential oil leakage at a critical junction. The COMETIC C9509 delivers precision sealing that prevents costly internal damage and maintains optimal engine protection during...09350182- SKU:
- 09350182
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- APPLICATION:
- STARTER SHAFT
- UNITS:
- 5 PACK
- PRODUCT NAME:
- SEAL
- MATERIAL:
- DUAL LIP VITON
- RIDING STYLE:
- STREET
Now: $16.00Was: $16.90 -
On Sale
COMETIC Drain Plug Washer C9498
COMETIC
Now: $6.00Was: $6.70A worn or degraded drain plug washer is an often-overlooked source of slow oil leaks that compound maintenance headaches over time. The COMETIC C9498 eliminates this vulnerability with a premium, fuel-resistant compound engineered to maintain a reliable...09350185- SKU:
- 09350185
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- NYLON
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,063'
- THICKNESS IMPERIAL:
- 0.063'
- UNITS:
- 10 PACK
- APPLICATION:
- DRAIN PLUG
- PRODUCT NAME:
- WASHER
Now: $6.00Was: $6.70 -
On Sale
COMETIC Counter Shaft O-Ring C9529
COMETIC
Now: $6.00Was: $6.40Counter shaft seals are critical to maintaining proper engine pressurization and preventing fuel leakage in high-performance applications. The COMETIC C9529 O-Ring is engineered from premium, fuel-resistant elastomers that resist the thermal cycling and...09350187- SKU:
- 09350187
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- APPLICATION:
- COUNTERSHAFT
- MATERIAL:
- BUNA RUBBER
Now: $6.00Was: $6.40 -
On Sale
COMETIC Right Mainshaft O-Ring C9495
COMETIC
Now: $5.00Was: $5.30A compromised mainshaft seal is a fast track to fluid leakage and catastrophic drivetrain failure. The COMETIC Right Mainshaft O-Ring (C9495) replaces worn or damaged seals with a precision-engineered component designed to contain pressure and prevent...09350188- SKU:
- 09350188
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- 25 PACK
- APPLICATION:
- MAIN DRIVE GEAR
- RIDING STYLE:
- STREET
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- APPLICATION:
- TRANSMISSION
Now: $5.00Was: $5.30 -
On Sale
COMETIC Mainshaft Quad Seal C9361
COMETIC
Now: $10.00Was: $10.60Mainshaft seals are critical to preventing internal transmission fluid leakage and maintaining hydraulic pressure—especially under high-performance driving conditions where vibration and heat accelerate seal degradation. The COMETIC Mainshaft Quad Seal...09350189- SKU:
- 09350189
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- MAIN DRIVE GEAR
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- UNITS:
- 10 PACK
- APPLICATION:
- TRANSMISSION
Now: $10.00Was: $10.60Qty in Cart: 0Quantity:Price:Now: $10.00Was: $10.60Subtotal:
Buying Guide and FAQs
Buying Guide: Factors to Consider When Choosing Harley Bike Engine Seals, O-Rings, and Kits
- Compatibility: Ensure seals and O-rings match your Harley's engine type (e.g., Big Twin, Twin Cam, Evo) and model specifics (e.g., FL/FLH, XL, Softail). Use the vehicle selector for year-specific fits (e.g., 1973-1983 for fork seals, 1990-up for drive gear seals) to prevent leaks or fit issues.
- Type of Use: For high-temperature or oil-exposed areas, opt for Viton seals for superior resistance; standard rebuilds benefit from nitrile or silicone O-rings for reliable sealing in street riding conditions.
- Components and Upgrades: Select individual seals (e.g., sprocket shaft, shifter lever) or packs (5-10 units); upgrade to fuel-resistant kits for comprehensive overhauls. Focus on materials that won't crack or become brittle.
- Brand and Quality: Choose James Gasket for top-quality seals like drive gear or solenoid types, or Cometic for premium Viton/silicone/nitrile options. Prioritize USA-made materials for durability and fuel resistance.
- Installation and Cost: Seals are straightforward replacements for DIY maintenance; prices range from $3.95 for individual seals to $35.95 for kits—factor in pack sizes (e.g., 5-10) and free shipping over $99 for value.
Frequently Asked Questions (FAQs)
- What Harley models and engines do these seals and O-rings support? Parts support Big Twin, Evo, Twin Cam, and models like FL/FLH, XL, Softail—use the year/make/model filter for compatibility, including specific applications like oil pump or fork seals.
- How do Viton seals improve performance? Viton offers high-temp and oil resistance, preventing leaks in critical areas like sprocket shafts or pushrod covers for reliable engine operation.
- What materials are used in seals and O-rings? Common materials include Viton (for oil/cranks), Nitrile Rubber (neutral switch), Silicone (rocker breather), ensuring fuel resistance without cracking.
- Are these sold in packs or individually? Many are in packs (5-10 units) for convenience in rebuilds; some like fork seal kits include everything needed for installation.
- What if a part doesn't fit my Harley? Verify application (e.g., shifter shaft, fuel filter) and year before buying. Our returns policy allows exchanges or refunds if it doesn't match.
- Can I find related engine parts? Yes—explore gaskets, pistons, or full rebuild kits in the Harley engine category to complement your seals and O-rings for a complete overhaul.
