Harley Engine
Harley Bike Engine Parts at JJ Motorsports
Rebuild and boost your Harley's engine with premium parts from JJ Motorsports. Our inventory features complete gasket sets, piston kits, oil filters, pushrod tubes, and coolers designed for maximum strength, leak-free sealing, and high-performance in extreme conditions. Compatible with Big Twins, Softail, Touring, and more, these components support top-end overhauls, oil management, and durability for street rides or custom builds.
Shop trusted brands like Drag Specialties for magnetic filters and Wiseco for forged pistons. Explore related categories such as Harley air and fuel for carb tuning or Harley drivetrain for transmission upgrades.
Top Harley Engine Products
- DRAG SPECIALTIES Magnetic Ring Oil Filter - Chrome - 3-1/4" 140003HP-BX18 – Captures metal particles with pressure relief.
- WISECO Piston Kit .010 .883 XL K1656 – Forged aluminum with rings, pins, and circlips for rebuilds.
- DRAG SPECIALTIES Pushrod Tube Kit Big Twin 75711 – Includes tubes, clips, cups, and springs for complete engine.
- ULTRACOOL Below Regulator Mount Oil Cooler Stainless Steel RF-2CSS – Fits S&S 111/124/143 engines with machined adapter.
- PAUGHCO Ribbed Teardrop Air Cleaner 701-200 – Chrome-plated aluminum with mini filter.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
COMETIC Clutch Release Gear Seal C9364-1
COMETIC
$4.00The clutch release seal is a critical barrier against fluid contamination and leakage in your clutch hydraulic system. A worn or deteriorating seal compromises pressure consistency and can lead to engagement issues, slipping, and costly internal damage...09350827- SKU:
- 09350827
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
- APPLICATION:
- RELEASE ROD
- MATERIAL:
- VITON
$4.00 -
COMETIC Sprocket Shaft Seal C9366-1
COMETIC
$6.00Sprocket shaft seals are critical to preventing fluid leakage and contamination in high-performance engines where precision and reliability are non-negotiable. The COMETIC C9366-1 delivers the durability required for sustained racing applications without...09350829- SKU:
- 09350829
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- SPROCKET SHAFT
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- TYPE:
- OIL
$6.00 -
On Sale
COMETIC Pushrod Cover Seals C9369
COMETIC
Now: $11.00Was: $11.60Pushrod cover leaks are a common source of oil seepage that compounds over time, potentially contaminating spark plug wells and compromising ignition reliability. The COMETIC C9369 Pushrod Cover Seals are precision-engineered replacements that restore a...09350832- SKU:
- 09350832
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- PUSHROD COVER
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- MATERIAL:
- VITON
- UNITS:
- 5 PACK
Now: $11.00Was: $11.60Qty in Cart: 0Quantity:Price:Now: $11.00Was: $11.60Subtotal: -
COMETIC Shifter Lever Shaft Seal C9370-1
COMETIC
$5.00Shifter lever shaft seals endure extreme heat cycles and fluid exposure in high-performance transmissions—component failure here means slippage, leakage, and potential drivetrain damage. The COMETIC C9370-1 is engineered with fuel-resistant elastomer...09350833- SKU:
- 09350833
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- MATERIAL:
- VITON
- APPLICATION:
- SHIFTER SHAFT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$5.00Qty in Cart: 0Quantity:Price:$5.00Subtotal: -
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: $7.40 -
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: $8.40Qty in Cart: 0Quantity:Price:Now: $8.00Was: $8.40Subtotal: -
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: $3.20 -
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: $14.95 -
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: $5.20Qty in Cart: 0Quantity:Price:MSRP: $5.20Now: $5.00Was: $5.20Subtotal: -
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: $5.30Qty in Cart: 0Quantity:Price:Now: $5.00Was: $5.30Subtotal: -
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
