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 Trans Shifter Drum Seal C9354F5
COMETIC
Now: $8.82Was: $9.80Transmission seal integrity is critical for maintaining proper fluid pressure and preventing costly leaks that compromise performance and reliability. The COMETIC Trans Shifter Drum Seal C9354F5 is...09350376- SKU:
- 09350376
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- APPLICATION:
- SHIFTER SHAFT
- APPLICATION:
- TRANSMISSION
Now: $8.82Was: $9.80 -
On Sale
COMETIC Interconnect Seal C9004
COMETIC
Now: $16.20Was: $18.00Engine block sealing requires precision and reliability—a single leak compromises combustion efficiency and creates cascading failures downstream. The COMETIC Interconnect Seal C9004 delivers the...09350377- SKU:
- 09350377
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- APPLICATION:
- INTERCONNECT
- MATERIAL:
- VITON
Now: $16.20Was: $18.00 -
On Sale
COMETIC O-Ring & Valve O-Ring - Twin Cam C9586
COMETIC
MSRP: $6.95Now: $6.26Was: $6.95Proper sealing is critical to engine reliability, and a compromised O-ring can lead to fluid leaks and performance loss. The COMETIC C9586 delivers consistent, dependable sealing across...09350139- SKU:
- 09350139
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- PUSHROD COVER
- APPLICATION:
- PUSHROD TUBE
- MATERIAL:
- VITON
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL
MSRP: $6.95Now: $6.26Was: $6.95Qty in Cart: 0Quantity:Price:MSRP: $6.95Now: $6.26Was: $6.95Subtotal: -
On Sale
COMETIC Rocker Box Washer C9400
COMETIC
Now: $4.77Was: $5.30Rocker box gasket sealing surfaces demand precision engineering to prevent oil weeping and maintain crankcase pressure integrity. The COMETIC Rocker Box Washer C9400 delivers the fuel-resistant...09350168- SKU:
- 09350168
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- APPLICATION:
- ROCKER COVER
- MATERIAL:
- COPPER
- PRODUCT NAME:
- WASHER
Now: $4.77Was: $5.30 -
On Sale
COMETIC Paper Rocker Box Washer C9286
COMETIC
Now: $4.23Was: $4.70Rocker box washers endure constant thermal cycling and fuel exposure in high-performance engines—standard materials simply don't cut it. The COMETIC C9286 is engineered from premium, fuel-resistant...09350169- SKU:
- 09350169
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- APPLICATION:
- ROCKER COVER
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- WASHER
Now: $4.23Was: $4.70 -
On Sale
COMETIC Oil Pump Cover O-Ring C9440
COMETIC
MSRP: $6.25Now: $5.63Was: $6.25Oil pump cover o-rings are critical sealing components that prevent pressurized oil leakage and maintain system integrity under sustained engine operation. A compromised o-ring leads to oil loss,...09350174- SKU:
- 09350174
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- APPLICATION:
- OIL PUMP
- RIDING STYLE:
- STREET
- UNITS:
- 25 PACK
MSRP: $6.25Now: $5.63Was: $6.25Qty in Cart: 0Quantity:Price:MSRP: $6.25Now: $5.63Was: $6.25Subtotal: -
On Sale
COMETIC Oil Pump Drive Gear Seal C9349
COMETIC
Now: $8.55Was: $9.50Your engine's oil pump drive gear seal is a critical component that prevents costly oil leakage and maintains proper lubrication pressure under demanding track or street conditions. A compromised...09350175- SKU:
- 09350175
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- OIL PUMP
- RIDING STYLE:
- STREET
- APPLICATION:
- MAIN DRIVE GEAR
- MATERIAL:
- VITON
- UNITS:
- 5 PACK
Now: $8.55Was: $9.50Qty in Cart: 0Quantity:Price:Now: $8.55Was: $9.50Subtotal: -
On Sale
COMETIC Sprocket Shaft Seal C9351
COMETIC
Now: $10.44Was: $11.60A compromised sprocket shaft seal allows critical lubrication to escape and contaminants to infiltrate your engine—accelerating wear on precision components and threatening reliability during...09350176- SKU:
- 09350176
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- APPLICATION:
- SPROCKET SHAFT
- PRODUCT NAME:
- SEAL
Now: $10.44Was: $11.60Qty in Cart: 0Quantity:Price:Now: $10.44Was: $11.60Subtotal: -
On Sale
COMETIC Upper Pushrod Cover O-Ring Pack C9451
COMETIC
MSRP: $6.25Now: $5.63Was: $6.25Upper pushrod cover leaks are a common source of oil seepage that can compromise engine cleanliness and create maintenance headaches. COMETIC's OEM-replacement O-ring pack eliminates the guesswork by...09350178- SKU:
- 09350178
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- O-RING
- THICKNESS:
- 0,060'
- APPLICATION:
- PUSHROD COVER
- APPLICATION:
- ROCKER COVER
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 10 PACK
MSRP: $6.25Now: $5.63Was: $6.25 -
On Sale
COMETIC Starter Shaft Seal C9491
COMETIC
Now: $8.55Was: $9.50A leaking starter shaft seal compromises engine reliability and can lead to costly oil loss and starter failure. The COMETIC C9491 delivers a precision OEM-quality replacement that restores proper...09350180- SKU:
- 09350180
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- VITON
- APPLICATION:
- STARTER SHAFT
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
Now: $8.55Was: $9.50 -
On Sale
COMETIC Mainshaft O-Ring C9530
COMETIC
Now: $5.76Was: $6.40A failing mainshaft seal will compromise your transmission's integrity and lead to costly internal damage. The COMETIC Mainshaft O-Ring C9530 delivers the fuel-resistant durability and precision fit...09350190- SKU:
- 09350190
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- APPLICATION:
- MAIN DRIVE GEAR
- RIDING STYLE:
- STREET
- UNITS:
- 25 PACK
- APPLICATION:
- TRANSMISSION
Now: $5.76Was: $6.40Qty in Cart: 0Quantity:Price:Now: $5.76Was: $6.40Subtotal: -
On Sale
COMETIC Top End Gasket Kit - 95" - Twin Cam - EST C9780
COMETIC
MSRP: $181.60Now: $163.44Was: $181.60Top-end gasket failure is one of the most expensive problems in engine rebuilding—and it's entirely preventable with the right sealing technology. The COMETIC EST C9780 eliminates hot spots that lead...DS172085- SKU:
- DS172085
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- BORE SIZE IMPERIAL:
- 3.875'
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- BORE SIZE:
- 3,875'
- MATERIAL:
- STAINLESS STEEL
- DISPLACEMENT:
- 95'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
MSRP: $181.60Now: $163.44Was: $181.60 -
On Sale
COMETIC Head Gasket -.04"- Evo - 3.625" C9691
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A quality head gasket is foundational to engine reliability—especially in high-boost Evo applications where combustion pressures and thermal cycling demand precision sealing. The COMETIC C9691 uses...DS172089- SKU:
- DS172089
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.670'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 3,670'
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
MSRP: $61.90Now: $55.71Was: $61.90 -
On Sale
COMETIC Head Gasket - .040 - 88" - Twin Cam C9745
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A compromised head gasket will rob your Twin Cam engine of compression, power, and reliability. The COMETIC C9745 uses multi-layer steel construction with load control embossments to maintain even...DS172107- SKU:
- DS172107
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE IMPERIAL:
- 3.750'
- MATERIAL:
- LAYERED STEEL
- THICKNESS IMPERIAL:
- 0,040'
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- BORE SIZE:
- 3,750'
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
MSRP: $61.90Now: $55.71Was: $61.90 -
On Sale
COMETIC Main Shaft Seal C9262
COMETIC
MSRP: $10.95Now: $9.86Was: $10.95A worn main shaft seal is a silent efficiency killer—allowing fluid seepage that compromises lubrication, increases friction, and can lead to catastrophic engine damage if left unchecked. The COMETIC...09350203- SKU:
- 09350203
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- APPLICATION:
- MAIN DRIVE GEAR
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
MSRP: $10.95Now: $9.86Was: $10.95Qty in Cart: 0Quantity:Price:MSRP: $10.95Now: $9.86Was: $10.95Subtotal: -
On Sale
COMETIC Lower Tappet Block O-Ring C9444
COMETIC
Now: $7.56Was: $8.40The lower tappet block o-ring is a critical seal in your engine's valve train system—one that directly impacts oil pressure consistency and prevents costly leaks that compromise performance...09350227- SKU:
- 09350227
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- LOWER TAPPET BLOCK
- RIDING STYLE:
- STREET
- MATERIAL:
- NITRILE
- UNITS:
- 10 PACK
- PRODUCT NAME:
- O-RING
Now: $7.56Was: $8.40Qty in Cart: 0Quantity:Price:Now: $7.56Was: $8.40Subtotal: -
On Sale
COMETIC Clutch Inspection Cover O-Ring C9434
COMETIC
Now: $5.76Was: $6.40A failing clutch inspection cover o-ring can compromise your engine's sealing integrity, leading to oil seepage and potential contamination of critical clutch components. This COMETIC replacement...09350231- SKU:
- 09350231
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- BUNA
- UNITS:
- 10 PACK
- PRODUCT NAME:
- O-RING
- APPLICATION:
- CLUTCH INSPECTION COVER
- RIDING STYLE:
- STREET
Now: $5.76Was: $6.40Qty in Cart: 0Quantity:Price:Now: $5.76Was: $6.40Subtotal: -
On Sale
COMETIC Oil Pump Gasket - AFM C9399F
COMETIC
Now: $6.66Was: $7.40A failing oil pump gasket can cause catastrophic oil leaks and pressure loss, compromising engine protection and reliability during high-stress racing conditions. The COMETIC Oil Pump Gasket AFM...09350236- SKU:
- 09350236
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- STREET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- THICKNESS:
- 0,032'
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.032'
Now: $6.66Was: $7.40Qty in Cart: 0Quantity:Price:Now: $6.66Was: $7.40Subtotal: -
On Sale
COMETIC Oil Pump Gasket - AFM C9315F
COMETIC
Now: $5.76Was: $6.40A failing oil pump gasket compromises your engine's lubrication system, risking catastrophic bearing wear and seizure. The COMETIC Oil Pump Gasket AFM C9315F delivers the precision seal your...09350237- SKU:
- 09350237
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- THICKNESS IMPERIAL:
- 0.032'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,032'
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
Now: $5.76Was: $6.40 -
On Sale
COMETIC Top End Gasket Kit - Twin Cooled - .030" C10138-030
COMETIC
MSRP: $183.70Now: $165.33Was: $183.70A top-end gasket failure can sideline your engine and tank a season. The COMETIC C10138-030 uses Extreme Sealing Technology with embossed stainless steel and proprietary rubber material to eliminate...09344837- SKU:
- 09344837
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE:
- 4,000'
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 4.000'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,030'
- DISPLACEMENT:
- 110'
- THICKNESS METRIC:
- 0.76 MM
- MATERIAL:
- RUBBER
- MATERIAL:
- VITON
- UNITS:
- KIT
MSRP: $183.70Now: $165.33Was: $183.70Qty in Cart: 0Quantity:Price:MSRP: $183.70Now: $165.33Was: $183.70Subtotal:
