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 Main Drive Gear Seal C9506
COMETIC
Now: $8.01Was: $8.90A leaking main drive gear seal doesn't just waste oil—it risks catastrophic engine damage and costly downtime. The COMETIC C9506 delivers factory-grade sealing reliability without the factory wait...09350197- SKU:
- 09350197
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- MAIN DRIVE GEAR
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
Now: $8.01Was: $8.90 -
On Sale
COMETIC Inspection Cover Gasket - FX C9331F5
COMETIC
Now: $16.56Was: $18.40A leaking inspection cover gasket compromises engine seal integrity and can lead to oil seepage that damages surrounding components. The COMETIC C9331F5 delivers a precision-engineered seal that...20111495- SKU:
- 20111495
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 5 PACK
- TYPE:
- INSPECTION COVER
- THICKNESS:
- 1,52 MM (0,060')
Now: $16.56Was: $18.40Qty in Cart: 0Quantity:Price:Now: $16.56Was: $18.40Subtotal: -
On Sale
COMETIC O-Ring C10210
COMETIC
Now: $6.12Was: $6.80A quality o-ring is the backbone of any sealed system—without proper sealing, you're looking at leaks, contamination, and catastrophic failure. The Cometic O-Ring C10210 delivers the precision fit...09350999- SKU:
- 09350999
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- APPLICATION:
- OIL PUMP
- UNITS:
- 10 PACK
Now: $6.12Was: $6.80 -
On Sale
COMETIC Top End Gasket - Big Bore - Big Twin - EST C9767
COMETIC
MSRP: $176.35Now: $158.72Was: $176.35A top-end rebuild demands precision sealing—any gasket failure means catastrophic engine damage and costly downtime. The COMETIC EST C9767 eliminates hot spots that cause premature gasket failure by...DS172079- SKU:
- DS172079
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- MATERIAL:
- STAINLESS STEEL
- BORE SIZE IMPERIAL:
- 3.625'
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- RUBBER
- TYPE:
- TOP END
- UNITS:
- KIT
- BORE SIZE:
- 3,625'
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
MSRP: $176.35Now: $158.72Was: $176.35 -
On Sale
COMETIC Top End Gasket - Big Twin - EST C9635
COMETIC
MSRP: $142.75Now: $128.48Was: $142.75A top-end rebuild demands gaskets engineered to survive extreme combustion temperatures and cylinder pressures—and Cometic's EST technology delivers exactly that. The embossed stainless steel...DS172080- SKU:
- DS172080
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
MSRP: $142.75Now: $128.48Was: $142.75 -
On Sale
COMETIC Top End Gasket - Big Twin - EST C9747
COMETIC
MSRP: $142.75Now: $128.48Was: $142.75Gasket failure compromises cylinder sealing and leads to combustion pressure loss, oil leakage, and costly downtime. COMETIC's EST gaskets eliminate hot spots through advanced heat dissipation,...DS172081- SKU:
- DS172081
- Availability:
- Ships Same Business Day
- Weight:
- 0.69 LBS
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,500'
- BORE SIZE IMPERIAL:
- 3.500'
- MATERIAL:
- RUBBER
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
MSRP: $142.75Now: $128.48Was: $142.75Qty in Cart: 0Quantity:Price:MSRP: $142.75Now: $128.48Was: $142.75Subtotal: -
On Sale
COMETIC Top End Gasket Kit - Twin Cam 88 - EST C9779
COMETIC
MSRP: $183.70Now: $165.33Was: $183.70A top-end gasket failure can sideline your Twin Cam 88 when you can least afford it. COMETIC's EST (Extreme Sealing Technology) kits eliminate the guesswork with precision-engineered gaskets designed...DS172084- SKU:
- DS172084
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- STAINLESS STEEL
- BORE SIZE IMPERIAL:
- 3.750'
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE SIZE:
- 3,750'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
MSRP: $183.70Now: $165.33Was: $183.70 -
On Sale
COMETIC Engine Gasket Kit - 110" C10157
COMETIC
MSRP: $287.65Now: $258.89Was: $287.65A complete gasket failure can sideline your engine and derail your season. The COMETIC C10157 110" gasket kit uses purpose-engineered materials for each sealing application, ensuring reliable...09345074- SKU:
- 09345074
- Availability:
- Ships Same Business Day
- Weight:
- 1.91 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
MSRP: $287.65Now: $258.89Was: $287.65 -
On Sale
COMETIC Engine Gasket Kit - 110" C10157-030
COMETIC
MSRP: $287.65Now: $258.89Was: $287.65A complete engine gasket failure can leave you stranded—or worse, damage an otherwise solid build. The COMETIC C10157-030 gasket kit eliminates guesswork by providing OEM-quality sealing across your...09345075- SKU:
- 09345075
- Availability:
- Ships Same Business Day
- Weight:
- 1.70 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
MSRP: $287.65Now: $258.89Was: $287.65 -
On Sale
COMETIC Top End Gasket Kit - 883 C9194
COMETIC
MSRP: $229.90Now: $206.91Was: $229.90A failing top-end gasket can compromise combustion chamber integrity and lead to costly coolant leaks or compression loss. The COMETIC C9194 eliminates guesswork by supplying every gasket, seal, and...09344805- SKU:
- 09344805
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE SIZE IMPERIAL:
- 3.000'
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,000'
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- TYPE:
- TOP END
- DISPLACEMENT:
- 883 CC
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
MSRP: $229.90Now: $206.91Was: $229.90Qty in Cart: 0Quantity:Price:MSRP: $229.90Now: $206.91Was: $229.90Subtotal: -
On Sale
COMETIC Primary Gasket Kit C9210
COMETIC
MSRP: $56.65Now: $50.99Was: $56.65A primary gasket kit is fundamental to any high-performance engine build—seal failure leads to oil weeping, contamination, and power loss. Cometic's AFM material delivers the reliability you need for...09344806- SKU:
- 09344806
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
MSRP: $56.65Now: $50.99Was: $56.65Qty in Cart: 0Quantity:Price:MSRP: $56.65Now: $50.99Was: $56.65Subtotal: -
On Sale
COMETIC Primary Gasket C9309F1
COMETIC
MSRP: $45.10Now: $40.59Was: $45.10A properly sealed primary cover is critical to maintaining oil pressure, preventing leakage, and extending engine life—especially in high-performance applications where thermal cycling and vibration...09344808- SKU:
- 09344808
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- PRIMARY
- THICKNESS:
- 1,52 MM (0,060')
- UNITS:
- EACH
- THICKNESS IMPERIAL:
- 0.060'
MSRP: $45.10Now: $40.59Was: $45.10Qty in Cart: 0Quantity:Price:MSRP: $45.10Now: $40.59Was: $45.10Subtotal: -
On Sale
COMETIC Primary Gasket - Softail C9607F1
COMETIC
MSRP: $45.10Now: $40.59Was: $45.10A properly sealed primary case is non-negotiable for reliable Softail performance—leaks compromise your engine's integrity and create maintenance headaches. The COMETIC Primary Gasket C9607F1...09344809- SKU:
- 09344809
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- PRIMARY
- RIDING STYLE:
- STREET
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- UNITS:
- EACH
MSRP: $45.10Now: $40.59Was: $45.10Qty in Cart: 0Quantity:Price:MSRP: $45.10Now: $40.59Was: $45.10Subtotal: -
On Sale
COMETIC Engine Gasket Kit - EVO/XL C9755F
COMETIC
MSRP: $257.20Now: $231.48Was: $257.20A quality gasket kit is the foundation of reliable engine sealing—leaks, compression loss, and coolant mixing can cascade into catastrophic engine failure. The COMETIC C9755F delivers multi-layer...09344812- SKU:
- 09344812
- Availability:
- Ships Same Business Day
- Weight:
- 1.81 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- BORE SIZE IMPERIAL:
- 3.000'
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,000'
- UNITS:
- KIT
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
MSRP: $257.20Now: $231.48Was: $257.20 -
On Sale
COMETIC Complete Gasket Kit - Big Twin C10112
COMETIC
MSRP: $209.95Now: $188.96Was: $209.95A complete gasket failure can leave you stranded mid-season or cost you a race. COMETIC's Big Twin C10112 kit eliminates the guesswork by providing OEM-quality gaskets for every critical seal on your...09344733- SKU:
- 09344733
- Availability:
- Ships Same Business Day
- Weight:
- 1.90 LBS
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE:
- 3,937'
- BORE SIZE IMPERIAL:
- 3.937'
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
MSRP: $209.95Now: $188.96Was: $209.95 -
On Sale
COMETIC Complete Gasket Kit - Big Twin C10113
COMETIC
MSRP: $209.95Now: $188.96Was: $209.95A complete gasket failure can cost you days in the shop and thousands in lost racing time. The COMETIC Complete Gasket Kit for Big Twin engines eliminates guesswork by pairing the right material to...09344734- SKU:
- 09344734
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- BORE SIZE IMPERIAL:
- 4.060'
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- KIT
- BORE SIZE:
- 4,060'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
MSRP: $209.95Now: $188.96Was: $209.95Qty in Cart: 0Quantity:Price:MSRP: $209.95Now: $188.96Was: $209.95Subtotal: -
On Sale
COMETIC Primary Filler O-Ring C9446
COMETIC
Now: $4.77Was: $5.30A leaking primary cover gasket can compromise your engine's performance and longevity by allowing fuel and oil to escape where they shouldn't. The COMETIC Primary Filler O-Ring C9446 seals your...09344704- SKU:
- 09344704
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- FILLER
- MATERIAL:
- NITRILE RUBBER
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- O-RING
Now: $4.77Was: $5.30Qty in Cart: 0Quantity:Price:Now: $4.77Was: $5.30Subtotal: -
On Sale
COMETIC Head Gasket C9564-2
COMETIC
MSRP: $23.05Now: $20.75Was: $23.05A head gasket failure can compromise your engine's integrity and cost you significant downtime and money. The COMETIC C9564-2 delivers reliable sealing across demanding racing and high-performance...09344708- SKU:
- 09344708
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- COPPER
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- PAIR
- THICKNESS IMPERIAL:
- 0,032'
- TYPE:
- CYLINDER HEAD
MSRP: $23.05Now: $20.75Was: $23.05 -
On Sale
COMETIC Head Gasket C9565-2
COMETIC
MSRP: $23.05Now: $20.75Was: $23.05A head gasket is your engine's first line of defense against combustion pressure, coolant leaks, and oil bypass—and it demands precision engineering to perform under extreme conditions. The COMETIC...09344709- SKU:
- 09344709
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,032'
- MATERIAL:
- COPPER
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- UNITS:
- PAIR
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CYLINDER HEAD
MSRP: $23.05Now: $20.75Was: $23.05 -
On Sale
COMETIC Head Gasket C9566-2
COMETIC
MSRP: $23.05Now: $20.75Was: $23.05A head gasket is your engine's critical seal against combustion pressure, coolant leakage, and oil seepage. The COMETIC C9566-2 uses multi-layer steel construction with load-control embossments to...09344710- SKU:
- 09344710
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,043'
- MATERIAL:
- COPPER
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.09 MM
- THICKNESS:
- 1,09 MM (0,043')
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
MSRP: $23.05Now: $20.75Was: $23.05Qty in Cart: 0Quantity:Price:MSRP: $23.05Now: $20.75Was: $23.05Subtotal:
