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 Top End Gasket Kit - Twin Cam C9949-030
COMETIC
MSRP: $146.95Now: $132.26Was: $146.95A top-end gasket failure can sideline your build and compromise engine integrity. The COMETIC C9949-030 uses Extreme Sealing Technology with embossed stainless steel construction to eliminate hot...09344840- SKU:
- 09344840
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE:
- 4,000'
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS IMPERIAL:
- 0,030'
- DISPLACEMENT:
- 110'
- THICKNESS METRIC:
- 0.76 MM
- UNITS:
- KIT
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
MSRP: $146.95Now: $132.26Was: $146.95 -
On Sale
COMETIC Primary Gasket C10145F5
COMETIC
MSRP: $141.70Now: $127.53Was: $141.70A primary gasket is critical to maintaining a reliable seal between your engine's primary cover and crankcase—any failure here leads to oil leakage, contamination, and potential drivetrain damage...09345061- SKU:
- 09345061
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- THICKNESS IMPERIAL:
- 0.060'
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- PRIMARY COVER
- UNITS:
- 5 PACK
- MOUNTING POSITION:
- OUTER
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
MSRP: $141.70Now: $127.53Was: $141.70Qty in Cart: 0Quantity:Price:MSRP: $141.70Now: $127.53Was: $141.70Subtotal: -
On Sale
COMETIC Clutch Cover Gasket C10147F1
COMETIC
MSRP: $10.95Now: $9.86Was: $10.95A failing clutch cover gasket can lead to oil seepage, contaminated friction surfaces, and premature clutch wear—costly problems that compromise both performance and reliability. The COMETIC C10147F1...09345064- SKU:
- 09345064
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- MODEL:
- HI-PERFORMANCE
MSRP: $10.95Now: $9.86Was: $10.95Qty in Cart: 0Quantity:Price:MSRP: $10.95Now: $9.86Was: $10.95Subtotal: -
On Sale
COMETIC Clutch Cover Gasket C10147F5
COMETIC
MSRP: $37.75Now: $33.98Was: $37.75A failing clutch cover gasket compromises engine integrity and invites costly oil seepage into your transmission. The COMETIC C10147F5 eliminates this vulnerability with a chemically bonded AFM...09345065- SKU:
- 09345065
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- TYPE:
- CLUTCH COVER
- THICKNESS IMPERIAL:
- 0.060'
MSRP: $37.75Now: $33.98Was: $37.75Qty in Cart: 0Quantity:Price:MSRP: $37.75Now: $33.98Was: $37.75Subtotal: -
On Sale
COMETIC Primary Gasket Kit C10148
COMETIC
MSRP: $56.65Now: $50.99Was: $56.65A primary gasket kit failure can sideline your engine and cost you race time or project momentum. Cometic's AFM gasket material eliminates the guesswork—delivering consistent seal integrity across...09345066- SKU:
- 09345066
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- TYPE:
- PRIMARY
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
MSRP: $56.65Now: $50.99Was: $56.65Qty in Cart: 0Quantity:Price:MSRP: $56.65Now: $50.99Was: $56.65Subtotal: -
On Sale
COMETIC Inspection Cover Gasket C10152F1
COMETIC
MSRP: $11.95Now: $10.76Was: $11.95A leaking inspection cover gasket compromises engine sealing integrity and can lead to oil seepage that damages surrounding components. The COMETIC C10152F1 provides the precision fit and material...09345070- SKU:
- 09345070
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- INSPECTION COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- EACH
MSRP: $11.95Now: $10.76Was: $11.95 -
On Sale
COMETIC Breather Gasket - Big Twin C10114
COMETIC
Now: $10.80Was: $12.00A failing rocker box breather gasket compromises your engine's ability to manage crankcase pressure, leading to oil leaks, contaminated air intake, and potential engine damage. The COMETIC Breather...09344735- SKU:
- 09344735
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- BREATHER
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
Now: $10.80Was: $12.00Qty in Cart: 0Quantity:Price:Now: $10.80Was: $12.00Subtotal: -
On Sale
COMETIC Push Rod Gasket Set C10068
COMETIC
MSRP: $14.95Now: $13.46Was: $14.95A properly sealed push rod gallery is critical to maintaining oil pressure and preventing leakage in high-performance engines. The COMETIC Push Rod Gasket Set C10068 provides precision sealing where...09344652- SKU:
- 09344652
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- PUSHROD COVER
- UNITS:
- KIT
MSRP: $14.95Now: $13.46Was: $14.95Qty in Cart: 0Quantity:Price:MSRP: $14.95Now: $13.46Was: $14.95Subtotal: -
On Sale
COMETIC Rocker Cover Gasket - Big Twin C9336-2
COMETIC
MSRP: $6.95Now: $6.26Was: $6.95A failing rocker cover gasket compromises engine sealing and invites oil leakage that accelerates wear on critical components. The COMETIC C9336-2 delivers reliable containment with a...09344684- SKU:
- 09344684
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER BASE
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- THICKNESS IMPERIAL:
- 0,031'
- MATERIAL:
- FIBER
- THICKNESS:
- 0,79 MM (0,031')
MSRP: $6.95Now: $6.26Was: $6.95Qty in Cart: 0Quantity:Price:MSRP: $6.95Now: $6.26Was: $6.95Subtotal: -
On Sale
COMETIC Primary Cover Gasket C9703F1
COMETIC
MSRP: $24.10Now: $21.69Was: $24.10A primary cover gasket failure can quickly sideline your bike and compromise engine sealing integrity. Cometic's AFM material delivers superior shape recovery and torque retention on machined...09344722- SKU:
- 09344722
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- THICKNESS IMPERIAL:
- 0,031'
- UNITS:
- EACH
- MATERIAL:
- FIBER
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,79 MM (0,031')
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- TYPE:
- PRIMARY
MSRP: $24.10Now: $21.69Was: $24.10Qty in Cart: 0Quantity:Price:MSRP: $24.10Now: $21.69Was: $24.10Subtotal: -
On Sale
COMETIC Transmission/Engine Case Gasket C9190F5
COMETIC
Now: $58.50Was: $65.00Transmission and engine case gasket integrity is critical to preventing fluid leakage, contamination, and catastrophic failure during high-performance driving. The COMETIC C9190F5 delivers the seal...09342019- SKU:
- 09342019
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- TYPE:
- TRANSMISSION
Now: $58.50Was: $65.00Qty in Cart: 0Quantity:Price:Now: $58.50Was: $65.00Subtotal: -
On Sale
COMETIC Shift Shaft Tube Gasket C9005
COMETIC
Now: $7.47Was: $8.30A reliable shift shaft tube gasket is critical to maintaining transmission integrity and preventing fluid leakage under racing conditions. The COMETIC C9005 delivers the durability and precision fit...09342020- SKU:
- 09342020
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- 10 PACK
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- PRIMARY SPACER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
- MATERIAL:
- STEEL
- THICKNESS:
- 1,52 MM (0,060')
Now: $7.47Was: $8.30 -
On Sale
COMETIC Gasket C9197F5
COMETIC
Now: $7.83Was: $8.70Engine gaskets are the unsung heroes of a reliable engine build—they seal critical surfaces and prevent fluid leakage under extreme pressures and temperatures. The COMETIC C9197F5 Viton gasket...09343176- SKU:
- 09343176
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- SILICONE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- TYPE:
- ROCKER COVER
Now: $7.83Was: $8.70 -
On Sale
COMETIC Head Gasket - 4.000" x .040" C10084-040
COMETIC
MSRP: $59.80Now: $53.82Was: $59.80A head gasket failure can sideline your engine and drain your wallet. The COMETIC C10084-040 uses multi-layer steel construction with load control embossments to maintain consistent clamping force...09343148- SKU:
- 09343148
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 4,000'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- MATERIAL:
- VITON
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 4.000'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
MSRP: $59.80Now: $53.82Was: $59.80 -
On Sale
COMETIC Head Gasket - 4.125" x .030" C10086-030
COMETIC
MSRP: $59.80Now: $53.82Was: $59.80A proper head gasket is the foundation of any reliable engine build—it seals combustion pressure, coolant, and oil passages under extreme thermal and mechanical stress. COMETIC's MLS design uses load...09343151- SKU:
- 09343151
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- VITON
- THICKNESS:
- 0,76 MM (0,030')
- BORE SIZE IMPERIAL:
- 4.125'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE:
- 4,125'
- TYPE:
- CYLINDER HEAD
MSRP: $59.80Now: $53.82Was: $59.80Qty in Cart: 0Quantity:Price:MSRP: $59.80Now: $53.82Was: $59.80Subtotal: -
On Sale
COMETIC Head Gasket - 4.250" x .040" C10088-040
COMETIC
MSRP: $59.80Now: $53.82Was: $59.80A quality head gasket is the seal that keeps combustion pressure contained and oil/coolant separate—and compromising on this critical component invites catastrophic engine failure. The COMETIC...09343156- SKU:
- 09343156
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- BORE SIZE:
- 4,250'
- MATERIAL:
- VITON
- BORE SIZE IMPERIAL:
- 4.250'
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS IMPERIAL:
- 0,040'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
- TYPE:
- CYLINDER HEAD
MSRP: $59.80Now: $53.82Was: $59.80Qty in Cart: 0Quantity:Price:MSRP: $59.80Now: $53.82Was: $59.80Subtotal: -
On Sale
COMETIC Upper Rocker Box Rubber Gasket C9277
COMETIC
Now: $20.88Was: $23.20A leaking rocker box gasket compromises oil containment and can accelerate wear on critical valve train components. The COMETIC Upper Rocker Box Rubber Gasket C9277 delivers reliable sealing with...09341346- SKU:
- 09341346
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- TYPE:
- ROCKER COVER
- MOUNTING POSITION:
- UPPER
- RIDING STYLE:
- STREET
Now: $20.88Was: $23.20Qty in Cart: 0Quantity:Price:Now: $20.88Was: $23.20Subtotal: -
On Sale
COMETIC Upper Rocker Box Rubber Gasket C9278
COMETIC
Now: $20.88Was: $23.20A properly sealed rocker box is fundamental to maintaining oil pressure and preventing leakage that compromises engine performance. The COMETIC Upper Rocker Box Rubber Gasket C9278 delivers reliable...09341347- SKU:
- 09341347
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- UPPER
- TYPE:
- ROCKER COVER
Now: $20.88Was: $23.20 -
On Sale
COMETIC Lower Rocker Box Rubber Gasket C9282
COMETIC
Now: $20.88Was: $23.20A reliable rocker box gasket is critical to maintaining proper oil containment and preventing leaks that compromise engine performance and longevity. The COMETIC C9282 delivers precision sealing with...09341350- SKU:
- 09341350
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- LOWER
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER
Now: $20.88Was: $23.20 -
On Sale
COMETIC Head Gasket -.04" - Evo - 3.75" C9695
COMETIC
MSRP: $61.90Now: $55.71Was: $61.90A head gasket failure can sideline your Evo and cost thousands in engine damage. The COMETIC C9695 uses multi-layer steel construction with load control embossments to distribute clamping force...09341354- SKU:
- 09341354
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- MATERIAL:
- LAYERED STEEL
- MATERIAL:
- VITON
- THICKNESS:
- 1,02 MM (0,040')
- BORE SIZE:
- 3,750'
- BORE SIZE IMPERIAL:
- 3.750'
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
MSRP: $61.90Now: $55.71Was: $61.90Qty in Cart: 0Quantity:Price:MSRP: $61.90Now: $55.71Was: $61.90Subtotal:
