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
-
On Sale
COMETIC Cylinder Head Gasket C10167
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A cylinder head gasket is the critical seal between your engine block and cylinder head—any failure here means combustion leak, loss of compression, and potential engine damage. The COMETIC C10167 is...09345923- SKU:
- 09345923
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- LAYERED STEEL
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 4.145'
- MATERIAL:
- VITON
- THICKNESS IMPERIAL:
- 0,040'
- BORE SIZE:
- 4,145'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- 2 PACK
MSRP: $61.90Now: $55.71Was: $61.90Qty in Cart: 0Quantity:Price:MSRP: $61.90Now: $55.71Was: $61.90Subtotal: -
On Sale
COMETIC Cylinder Head Gasket C10165
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A cylinder head gasket is only as good as its ability to seal under extreme pressure and temperature swings—and the COMETIC C10165 is engineered to handle exactly that. Built with a stainless steel...09345918- SKU:
- 09345918
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- 2 PACK
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE:
- 4,000'
- TYPE:
- CYLINDER HEAD
MSRP: $61.90Now: $55.71Was: $61.90 -
On Sale
COMETIC Cylinder/Base Gasket C10164-HB-030
COMETIC
MSRP: $81.85Now: $73.67Was: $81.85A quality cylinder/base gasket is non-negotiable when rebuilding an engine or replacing a failed seal—this is where catastrophic leaks start. The COMETIC C10164-HB-030 uses Multi-Layer Steel (MLS)...09345917- SKU:
- 09345917
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- MATERIAL:
- LAYERED STEEL
- RIDING STYLE:
- OFF-ROAD
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- VITON
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE:
- 3,937'
- PRODUCT NAME:
- GASKET
- UNITS:
- 2 PACK
- BORE SIZE IMPERIAL:
- 3.937'
- THICKNESS:
- 0,76 MM (0,030')
MSRP: $81.85Now: $73.67Was: $81.85 -
On Sale
COMETIC Cylinder Head Gasket C10164-030
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A proper cylinder head gasket is critical to maintaining combustion chamber seal integrity and preventing coolant or oil leakage under sustained load and temperature cycling. The COMETIC C10164-030...09345916- SKU:
- 09345916
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- THICKNESS METRIC:
- 0.76 MM
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 3.937'
- THICKNESS IMPERIAL:
- 0,030'
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- BORE SIZE:
- 3,937'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 2 PACK
MSRP: $61.90Now: $55.71Was: $61.90Qty in Cart: 0Quantity:Price:MSRP: $61.90Now: $55.71Was: $61.90Subtotal: -
On Sale
COMETIC Primary Gasket C10145F1
COMETIC
MSRP: $33.55Now: $30.20Was: $33.55A primary gasket failure can leave you stranded and cost you race time or weekend plans. The COMETIC C10145F1 uses proprietary AFM material that combines an aluminum core with bonded synthetic rubber...09345059- SKU:
- 09345059
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- PRIMARY COVER
MSRP: $33.55Now: $30.20Was: $33.55Qty in Cart: 0Quantity:Price:MSRP: $33.55Now: $30.20Was: $33.55Subtotal: -
On Sale
COMETIC Derby Gasket C10140F1
COMETIC
MSRP: $10.95Now: $9.86Was: $10.95A quality derby cover gasket is essential to maintaining a proper seal on your Harley Davidson's primary cover, preventing oil leakage and contamination that can compromise engine performance. The...09345057- SKU:
- 09345057
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- CLUTCH COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- DERBY COVER
- UNITS:
- EACH
MSRP: $10.95Now: $9.86Was: $10.95Qty in Cart: 0Quantity:Price:MSRP: $10.95Now: $9.86Was: $10.95Subtotal: -
On Sale
COMETIC Inner Push Pins Gasket C10122
COMETIC
MSRP: $16.75Now: $15.08Was: $16.75Gasket misalignment during assembly can compromise your engine case seal and create costly leaks or performance issues down the line. The COMETIC Inner Push Pins Gasket ensures your inner primary and...09344742- SKU:
- 09344742
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- TYPE:
- HOLDING PIN
- RIDING STYLE:
- STREET
MSRP: $16.75Now: $15.08Was: $16.75 -
On Sale
COMETIC Pushrod Tube O-Ring C9711-4
COMETIC
MSRP: $3.95Now: $3.56Was: $3.95Pushrod tube seals are critical to maintaining oil pressure and preventing leaks in high-performance engines—especially under sustained boost or sustained RPM. The COMETIC C9711-4 uses a...09344723- SKU:
- 09344723
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- O-RING
- APPLICATION:
- PUSHROD COVER
- MATERIAL:
- NITRILE RUBBER
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
MSRP: $3.95Now: $3.56Was: $3.95Qty in Cart: 0Quantity:Price:MSRP: $3.95Now: $3.56Was: $3.95Subtotal: -
On Sale
COMETIC Starter Motor Gasket C9333
COMETIC
MSRP: $4.15Now: $3.78Was: $4.20A failing starter motor gasket compromises your engine's seal integrity and can lead to oil leaks, contamination, and costly internal damage. The COMETIC C9333 is engineered to provide a reliable,...09344683- SKU:
- 09344683
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,31 MM (0,012')
- THICKNESS IMPERIAL:
- 0,012'
- MATERIAL:
- FIBER
- THICKNESS METRIC:
- 0.31 MM
- TYPE:
- CAM COVER
- UNITS:
- 10 PACK
MSRP: $4.15Now: $3.78Was: $4.20 -
On Sale
COMETIC Points Cover Gasket C9323
COMETIC
Now: $8.01Was: $8.90A leaking points cover gasket compromises engine sealing and invites contamination into your ignition system—exactly what you don't need when reliability matters. The COMETIC C9323 delivers...09344678- SKU:
- 09344678
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- THICKNESS IMPERIAL:
- 0,031'
- UNITS:
- 10 PACK
- MATERIAL:
- FIBER
- THICKNESS:
- 0,79 MM (0,031')
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- TYPE:
- POINT COVER
Now: $8.01Was: $8.90 -
On Sale
COMETIC Generator Mount Gasket C9321F
COMETIC
MSRP: $4.15Now: $3.78Was: $4.20A failing generator mount gasket compromises engine sealing and can lead to coolant leaks, overheating, and premature component wear. The Cometic C9321F restores a proper seal at the generator...09344676- SKU:
- 09344676
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- THICKNESS IMPERIAL:
- 0,032'
- UNITS:
- 5 PACK
- TYPE:
- GENERATOR
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS METRIC:
- 0.81 MM
MSRP: $4.15Now: $3.78Was: $4.20 -
On Sale
COMETIC Clutch Cover Gasket - XL C9319-1
COMETIC
MSRP: $7.95Now: $7.16Was: $7.95A failing clutch cover gasket means oil seepage, contamination, and potential mid-race failures. The COMETIC C9319-1 eliminates these risks with a reinforced aluminum-core AFM construction that holds...09344674- SKU:
- 09344674
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- MATERIAL:
- FIBER
- MODEL:
- HI-PERFORMANCE
- THICKNESS IMPERIAL:
- 0,031'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
MSRP: $7.95Now: $7.16Was: $7.95Qty in Cart: 0Quantity:Price:MSRP: $7.95Now: $7.16Was: $7.95Subtotal: -
On Sale
COMETIC Oil Pump Cover Gasket C9382-010
COMETIC
Now: $11.43Was: $12.70A leaking oil pump cover gasket can compromise your engine's oil pressure and reliability on the track or street. The COMETIC C9382-010 delivers OEM-quality sealing performance with premium materials...09341652- SKU:
- 09341652
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET
- UNITS:
- 12 PACK
- MATERIAL:
- RUBBER
- THICKNESS METRIC:
- 0.25 MM
- TYPE:
- OIL PUMP COVER
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,25 MM (0,010')
- THICKNESS IMPERIAL:
- 0,010'
Now: $11.43Was: $12.70 -
On Sale
COMETIC Cam Cover Gasket - .032" C9328F5-032
COMETIC
Now: $23.94Was: $26.60A leaking cam cover gasket compromises engine cleanliness and can lead to oil contamination of spark plug wells and ignition systems. COMETIC's .032" gasket delivers a reliable, factory-quality seal...09341646- SKU:
- 09341646
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS IMPERIAL:
- 0,032'
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CAM COVER
Now: $23.94Was: $26.60 -
On Sale
COMETIC Front Tappet Block Gasket C9298
COMETIC
Now: $5.76Was: $6.40A leaking front tappet block gasket compromises oil pressure, engine efficiency, and overall reliability—making this COMETIC replacement essential for any serious engine build or rebuild. OEM gaskets...09341645- SKU:
- 09341645
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- TYPE:
- TAPPET BLOCK
- MATERIAL:
- FIBER
- MOUNTING POSITION:
- FRONT
- THICKNESS METRIC:
- 0.51 MM
- UNITS:
- 10 PACK
- PRODUCT NAME:
- GASKET
Now: $5.76Was: $6.40 -
On Sale
COMETIC Top Cover Gasket C9488F
COMETIC
Now: $24.30Was: $27.00A quality top end gasket kit is non-negotiable for any engine rebuild or refresh—poor sealing directly compromises ring seal, power output, and engine longevity. The COMETIC C9488F delivers the...09341382- SKU:
- 09341382
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- UNITS:
- 10 PACK
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,032'
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- TRANSMISSION TOP COVER
- RIDING STYLE:
- STREET
Now: $24.30Was: $27.00 -
On Sale
COMETIC Top Cover Gasket C9522F
COMETIC
Now: $6.66Was: $7.40A quality head gasket is the foundation of a reliable, high-output engine—and the COMETIC C9522F is engineered to keep yours sealed under extreme conditions. Whether you're running naturally...09341378- SKU:
- 09341378
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- TRANSMISSION TOP COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
Now: $6.66Was: $7.40 -
On Sale
COMETIC Trans End Cover Gasket C9515-032AFM
COMETIC
Now: $26.73Was: $29.70High-output 4-stroke engines demand gasket technology that can handle extreme combustion pressures without sacrificing reliability. The Cometic Trans End Cover Gasket C9515-032AFM uses multi-layered...09341375- SKU:
- 09341375
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- UNITS:
- 10 PACK
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- TRANSMISSION END COVER
Now: $26.73Was: $29.70 -
On Sale
COMETIC Shift Lever O-Ring C9661
COMETIC
MSRP: $4.15Now: $3.74Was: $4.15Shift lever O-rings are critical sealing components that prevent fluid leakage and maintain consistent shifter performance under racing conditions. The COMETIC C9661 is engineered from premium,...09341374- SKU:
- 09341374
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- UNITS:
- 25 PACK
- APPLICATION:
- SHIFTER SHAFT
- RIDING STYLE:
- STREET
MSRP: $4.15Now: $3.74Was: $4.15 -
On Sale
COMETIC Lower Rocker Box Rubber Gasket C9281
COMETIC
Now: $20.88Was: $23.20Rocker box gaskets endure extreme thermal cycles and high oil pressures—failures here mean catastrophic engine damage and costly downtime. The COMETIC C9281 delivers reliable sealing with a proven...09341349- SKU:
- 09341349
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER COVER
- PRODUCT NAME:
- GASKET
Now: $20.88Was: $23.20
