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 Transmission Lid Gasket C10216
COMETIC
MSRP: $8.95Now: $8.06Was: $8.95Transmission fluid leaks compromise both performance and engine longevity, and a worn gasket is often the culprit. The COMETIC C10216 transmission lid gasket eliminates seepage with a proven aluminum...09345983- SKU:
- 09345983
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- TRANSMISSION TOP COVER
- UNITS:
- EACH
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
MSRP: $8.95Now: $8.06Was: $8.95 -
On Sale
COMETIC Cylinder Head Gasket C10167-030
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A cylinder head gasket failure can sideline your engine, but the COMETIC C10167-030 is engineered to handle extreme pressures, temperatures, and surface variations without compromise. Built with a...09345924- SKU:
- 09345924
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- BORE SIZE:
- 4,145'
- MATERIAL:
- LAYERED STEEL
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 4.145'
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 2 PACK
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
MSRP: $61.90Now: $55.71Was: $61.90 -
On Sale
COMETIC Dip Stick O-Ring - Sportster C9961
COMETIC
MSRP: $2.95Now: $2.88Was: $3.20Oil level monitoring depends on a reliable seal, and a degraded dip stick O-ring compromises both accuracy and engine cleanliness. COMETIC's fuel-resistant O-ring maintains its integrity under...09340740- SKU:
- 09340740
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- DIPSTICK
- MATERIAL:
- BUNA
- PRODUCT NAME:
- O-RING
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
MSRP: $2.95Now: $2.88Was: $3.20 -
On Sale
COMETIC Primary Gasket Kit C9886
COMETIC
MSRP: $138.55Now: $124.70Was: $138.55A primary gasket failure can leave you stranded and cost thousands in engine damage. The COMETIC C9886 Primary Gasket Kit eliminates guesswork with precision-engineered AFM gaskets that handle...09340742- SKU:
- 09340742
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
MSRP: $138.55Now: $124.70Was: $138.55Qty in Cart: 0Quantity:Price:MSRP: $138.55Now: $124.70Was: $138.55Subtotal: -
On Sale
COMETIC Primary Gasket Kit C9885
COMETIC
MSRP: $138.55Now: $124.70Was: $138.55A primary gasket failure can sideline your build and cost you race time. The COMETIC C9885 Primary Gasket Kit eliminates guesswork with precision-engineered AFM gaskets that handle extreme heat...09340743- SKU:
- 09340743
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- UNITS:
- KIT
MSRP: $138.55Now: $124.70Was: $138.55 -
On Sale
COMETIC Rocker Gasket - .020" C9563
COMETIC
Now: $18.09Was: $20.10Rocker cover gaskets are critical sealing components that prevent oil weepage and contamination in your engine's valve train. A failed or deteriorating gasket compromises engine cleanliness and can...09340748- SKU:
- 09340748
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER BASE
- THICKNESS:
- 0,51 MM (0,020')
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- MATERIAL:
- STEEL
- THICKNESS METRIC:
- 0.51 MM
- UNITS:
- 5 PACK
Now: $18.09Was: $20.10 -
On Sale
COMETIC Rocker Gasket - .020" C9561
COMETIC
Now: $15.21Was: $16.90Rocker cover gaskets are critical sealing components that prevent oil leakage at high RPM and under sustained boost pressure. A degraded or worn gasket compromises engine bay cleanliness and can lead...09340749- SKU:
- 09340749
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS:
- 0,51 MM (0,020')
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- LOWER
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER BASE
Now: $15.21Was: $16.90 -
On Sale
COMETIC Rocker Gasket - Evo C9866
COMETIC
Now: $55.17Was: $61.30Rocker cover gaskets endure extreme temperature swings and constant pressure cycles—failure here means oil seepage, contamination, and potential engine damage. The COMETIC Rocker Gasket C9866...09340751- SKU:
- 09340751
- Availability:
- Ships Same Business Day
- Weight:
- 0.57 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- ROCKER COVER BASE
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
Now: $55.17Was: $61.30 -
On Sale
COMETIC Rocker Gasket Kit - XL C9954
COMETIC
MSRP: $65.05Now: $58.55Was: $65.05Rocker box gasket failure compromises engine sealing and invites oil leakage that can damage surrounding components. The COMETIC Rocker Gasket Kit C9954 delivers a complete sealing solution with...09340752- SKU:
- 09340752
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- MODEL:
- EST
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- STEEL
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
MSRP: $65.05Now: $58.55Was: $65.05 -
On Sale
COMETIC Rocker Gasket - .020" C9986
COMETIC
MSRP: $30.40Now: $27.36Was: $30.40Rocker cover gaskets endure extreme temperature cycling and constant pressure—a failure here means oil leaks, contamination, and potential engine damage. The COMETIC C9986 delivers reliable sealing...09340753- SKU:
- 09340753
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,51 MM (0,020')
- TYPE:
- ROCKER COVER BASE
- UNITS:
- PAIR
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.51 MM
MSRP: $30.40Now: $27.36Was: $30.40 -
On Sale
COMETIC Lower Pushrod Tube Seal C9461
COMETIC
Now: $6.66Was: $7.40Pushrod tube seals are critical to preventing oil leakage and maintaining proper lubrication in high-performance engines—failure here can lead to catastrophic damage under racing conditions. The...09350259- SKU:
- 09350259
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- PUSHROD COVER
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- X-RING
- RIDING STYLE:
- STREET
- TYPE:
- QUAD SEAL
- UNITS:
- 10 PACK
Now: $6.66Was: $7.40 -
On Sale
COMETIC Oil Pump Cover O-Ring C9684
COMETIC
MSRP: $3.95Now: $3.56Was: $3.95Oil pump cover o-rings fail silently, leading to leaks that compromise lubrication and engine reliability. This COMETIC seal restores the critical barrier between your oil pump and engine block,...09350260- SKU:
- 09350260
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- OIL PUMP
- UNITS:
- 10 PACK
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
MSRP: $3.95Now: $3.56Was: $3.95Qty in Cart: 0Quantity:Price:MSRP: $3.95Now: $3.56Was: $3.95Subtotal: -
On Sale
COMETIC Inner Primary Bearing Seal C9518
COMETIC
Now: $10.44Was: $11.60Bearing seal failure leads to oil leakage, contamination, and catastrophic internal engine damage—especially in high-rpm applications where pressure and heat push standard seals beyond their limits...09350262- SKU:
- 09350262
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- APPLICATION:
- INNER PRIMARY
- MATERIAL:
- VITON
- UNITS:
- 5 PACK
Now: $10.44Was: $11.60Qty in Cart: 0Quantity:Price:Now: $10.44Was: $11.60Subtotal: -
On Sale
COMETIC Outer Rocker O-Ring C9224
COMETIC
Now: $28.89Was: $32.10Proper rocker cover sealing is critical to maintaining engine integrity and preventing oil leakage that can compromise performance and create costly cleanup issues. The COMETIC Outer Rocker O-Ring...09350264- SKU:
- 09350264
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- APPLICATION:
- LOWER ROCKER COVER
- PRODUCT NAME:
- SEAL
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
Now: $28.89Was: $32.10Qty in Cart: 0Quantity:Price:Now: $28.89Was: $32.10Subtotal: -
On Sale
COMETIC Pushrod Tube O-Ring C9584
COMETIC
MSRP: $8.95Now: $8.06Was: $8.95Pushrod tube O-rings are critical wear items that prevent oil leakage at the cylinder head—a common failure point in high-revving engines. Using OEM-equivalent Viton® seals ensures you're maintaining...09350268- SKU:
- 09350268
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- PUSHROD TUBE
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- UNITS:
- SET
MSRP: $8.95Now: $8.06Was: $8.95Qty in Cart: 0Quantity:Price:MSRP: $8.95Now: $8.06Was: $8.95Subtotal: -
On Sale
COMETIC Pushrod Tube Seal Set C9585
COMETIC
MSRP: $8.95Now: $8.06Was: $8.95Pushrod tube seals are critical to maintaining oil pressure and preventing leakage in your engine's valvetrain. Over time, factory seals degrade and fail, resulting in oil weeping, reduced...09350269- SKU:
- 09350269
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- UNITS:
- SET
- APPLICATION:
- PUSHROD TUBE
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
MSRP: $8.95Now: $8.06Was: $8.95 -
On Sale
COMETIC Pushrod Tube O-Ring C9216
COMETIC
MSRP: $8.95Now: $8.06Was: $8.95Pushrod tube O-ring seals are critical for maintaining a leak-free valve train and preventing oil seepage that compromises engine reliability. COMETIC's Viton® seals deliver superior chemical...09350270- SKU:
- 09350270
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- UNITS:
- SET
- APPLICATION:
- PUSHROD TUBE
- MATERIAL:
- VITON
MSRP: $8.95Now: $8.06Was: $8.95 -
On Sale
COMETIC Main Drive Gear Metal Seal C9493
COMETIC
Now: $8.01Was: $8.90The COMETIC Main Drive Gear Metal Seal C9493 is engineered to eliminate leakage at the main drive gear, a critical pressure point in high-performance engines where seal failure can compromise oil...09350194- SKU:
- 09350194
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- APPLICATION:
- MAIN DRIVE GEAR
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
Now: $8.01Was: $8.90Qty in Cart: 0Quantity:Price:Now: $8.01Was: $8.90Subtotal: -
On Sale
COMETIC Main Drive Gear Seal Rubber C9372
COMETIC
Now: $7.56Was: $8.40The COMETIC Main Drive Gear Seal (C9372) is engineered to prevent oil seepage and contamination at the main drive gear—a critical junction prone to leakage under high load and sustained RPM. A failed...09350195- SKU:
- 09350195
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- MAIN DRIVE GEAR
- MATERIAL:
- VITON
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
Now: $7.56Was: $8.40 -
On Sale
COMETIC Clutch Hub Nut Seal C9494
COMETIC
Now: $5.76Was: $6.40A properly sealed clutch hub nut is critical to preventing fluid leakage and maintaining clutch system integrity under racing conditions. The COMETIC C9494 seals the interface where your clutch hub...09350196- SKU:
- 09350196
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- VITON
- UNITS:
- 5 PACK
- STYLE:
- DUAL LIP
- APPLICATION:
- CLUTCH HUB
- PRODUCT NAME:
- SEAL
Now: $5.76Was: $6.40
