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
-
COMETIC Cam Gasket Kit - M8 C10178-FP
COMETIC
$60.85Components made from premium materials for long life and correct fitment, Includes all necessary gaskets, seals, O-rings and cork washers to do a cam change, Made in the U.S.A.09346316- SKU:
- 09346316
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- FEATURES:
- WITH ROCKER COVER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- CAM CHANGE
- UNITS:
- KIT
$60.85 -
COMETIC Cylinder Base Gasket Pair C10195
COMETIC
$33.55Center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements, Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load...09345958- SKU:
- 09345958
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- BORE SIZE IMPERIAL:
- 4.500'
- THICKNESS IMPERIAL:
- 0,014'
- UNITS:
- 2 PACK
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.36 MM
- TYPE:
- CYLINDER BASE
$33.55 -
COMETIC Primary Seal Gasket Kit C10196
COMETIC
$87.10Cometic's proprietary AFM (Aluminum Foamette Material) gaskets feature an aluminum core with a chemically blown, compounded nitrile synthetic rubber bonded to the outside, Gaskets have resistance to temperatures of more than 2500°F, Have an 85%...09345959- SKU:
- 09345959
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- TYPE:
- PRIMARY
- TYPE:
- STARTER
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$87.10 -
COMETIC Oil Pan Gasket Kit - M8 - FLHT C10197
COMETIC
$102.85Made in the U.S.A.09345960- SKU:
- 09345960
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- OIL PAN
- UNITS:
- KIT
$102.85 -
COMETIC Primary Gasket C10198F1
COMETIC
$45.10Cometic's proprietary AFM (Aluminum Foamette Material) gaskets feature an aluminum core with a chemically blown, compounded nitrile synthetic rubber bonded to the outside, Gaskets have resistance to temperatures of more than 2500°F, Have an 85%...09345961- SKU:
- 09345961
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- EACH
- THICKNESS:
- 1,52 MM (0,060')
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- PRIMARY COVER
$45.10 -
COMETIC Primary Gasket C10198F5
COMETIC
$120.50Cometic's proprietary AFM (Aluminum Foamette Material) gaskets feature an aluminum core with a chemically blown, compounded nitrile synthetic rubber bonded to the outside, Gaskets have resistance to temperatures of more than 2500°F, Have an 85%...09345962- SKU:
- 09345962
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- TYPE:
- PRIMARY COVER
- UNITS:
- 5 PACK
- THICKNESS IMPERIAL:
- 0.060'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$120.50 -
COMETIC Top End Gasket Kit - Twin Cooled - .040" C10138
COMETIC
$183.70EST (Extreme Sealing Technology) gasket kits include embossed stainless steel head, base, and rocker gaskets covered with a proprietary rubber material, Head gasket material allows heat to be drawn away from the combustion ring and dissipated evenly...09344836- SKU:
- 09344836
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MATERIAL:
- RUBBER
- MATERIAL:
- VITON
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE:
- 4,000'
- DISPLACEMENT:
- 110'
- BORE SIZE IMPERIAL:
- 4.000'
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
$183.70 -
COMETIC Coolant Tube O-Ring Set C10139
COMETIC
$31.45Contains all necessary O-rings and washers for cooling system, Must replace O-rings when removing cylinder head or servicing cooling system, Made in the U.S.A.09344838- SKU:
- 09344838
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- O-RING
- UNITS:
- KIT
- APPLICATION:
- COOLANT TUBE
- RIDING STYLE:
- STREET
$31.45 -
COMETIC Top End Gasket Kit - Twin Cam C9949
COMETIC
$153.25EST (Extreme Sealing Technology) gasket kits include embossed stainless steel head, base, and rocker gaskets covered with a proprietary rubber material, Head gasket material allows heat to be drawn away from the combustion ring and dissipated evenly...09344839- SKU:
- 09344839
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 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:
- 0,010'
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- DISPLACEMENT:
- 110'
- UNITS:
- KIT
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.25 MM
$153.25 -
COMETIC Cam Cover Gasket C10146F1
COMETIC
$17.80COMETIC Cam Cover Gasket09345062- SKU:
- 09345062
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- CAM COVER
- UNITS:
- EACH
- THICKNESS:
- 1,52 MM (0,060')
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
$17.80 -
COMETIC Cam Cover Gasket C10146F5
COMETIC
$82.90COMETIC Cam Cover Gasket09345063- SKU:
- 09345063
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- CAM COVER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- THICKNESS:
- 1,52 MM (0,060')
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 5 PACK
$82.90 -
COMETIC Rocker Box Gasket Kit C10150
COMETIC
$65.05Premium materials used for specific applications to provide a long, service free life, Kits include all gaskets, seals, O-rings and quality bolt seals needed when servicing both rocker boxes, Made in the U.S.A.09345068- SKU:
- 09345068
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- MODEL:
- EST
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- MATERIAL:
- STEEL
- TYPE:
- ROCKER BOX
$65.05 -
COMETIC Head Gasket C10070
COMETIC
$61.90Center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements, Outer layers are embossed and coated on both sides with Viton to meet the demands of a variety of harsh sealing environments, load...09344653- SKU:
- 09344653
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- 3,625'
- THICKNESS IMPERIAL:
- 0,040'
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE IMPERIAL:
- 3.625'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 1,02 MM (0,040')
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
$61.90 -
COMETIC Engine Gasket Kit - XL C9045F
COMETIC
$183.70Every gasket in these kits uses the best materials possible for its intended application, Multi-Layer Steel (MLS) head gaskets, Steel Viton®-coated base gaskets, Blue Viton valve stem seals, Aluminum Foam Material (AFM) race-style exhaust gaskets,...09344654- SKU:
- 09344654
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- BORE SIZE IMPERIAL:
- 3.250'
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- TYPE:
- COMPLETE
- BORE SIZE:
- 3,250'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$183.70 -
COMETIC Engine Gasket Kit - XL C9047F
COMETIC
$158.50Every gasket in these kits uses the best materials possible for its intended application, Multi-Layer Steel (MLS) head gaskets, Steel Viton®-coated base gaskets, Blue Viton valve stem seals, Aluminum Foam Material (AFM) race-style exhaust gaskets,...09344655- SKU:
- 09344655
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE SIZE:
- 3,365'
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- BORE SIZE IMPERIAL:
- 3.365'
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
$158.50 -
COMETIC Top End Gasket Kit - XL C9052
COMETIC
$75.55Extreme Sealing Technology (EST) gasket kits include embossed stainless steel head, base and rocker gaskets covered with a proprietary rubber material, Head gasket material allows heat to be drawn away from the combustion ring and dispatched evenly...09344656- SKU:
- 09344656
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE IMPERIAL:
- 3.1875'
- MATERIAL:
- STEEL
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.81 MM
- MODEL:
- EST
- THICKNESS IMPERIAL:
- 0,031'
- THICKNESS IMPERIAL:
- 0,032'
- BORE SIZE:
- 3,1875'
- MATERIAL:
- ALUMINUM
- MATERIAL:
- VITON
- STYLE:
- HIGH COMPRESSION
- THICKNESS METRIC:
- 0.79 MM
$75.55Qty in Cart: 0Quantity:Price:$75.55Subtotal: -
COMETIC Top End Gasket Kit - XL C9102
COMETIC
$75.55Extreme Sealing Technology (EST) gasket kits include embossed stainless steel head, base and rocker gaskets covered with a proprietary rubber material, Head gasket material allows heat to be drawn away from the combustion ring and dispatched evenly...09344657- SKU:
- 09344657
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,031'
- THICKNESS METRIC:
- 0.81 MM
- BORE SIZE IMPERIAL:
- 3.000'
- THICKNESS METRIC:
- 0.79 MM
- TYPE:
- TOP END
- BORE SIZE:
- 3,000'
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- UNITS:
- KIT
- MATERIAL:
- ALUMINUM
- MODEL:
- EST
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD
- THICKNESS IMPERIAL:
- 0,032'
$75.55Qty in Cart: 0Quantity:Price:$75.55Subtotal: -
COMETIC Top End Gasket Kit - XL C9103
COMETIC
$75.55Extreme Sealing Technology (EST) gasket kits include embossed stainless steel head, base and rocker gaskets covered with a proprietary rubber material, Head gasket material allows heat to be drawn away from the combustion ring and dispatched evenly...09344658- SKU:
- 09344658
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,031'
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- TOP END
- BORE SIZE IMPERIAL:
- 3.1875'
- UNITS:
- KIT
- MODEL:
- EST
- THICKNESS METRIC:
- 0.79 MM
- BORE SIZE:
- 3,1875'
- MATERIAL:
- ALUMINUM
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD
- THICKNESS IMPERIAL:
- 0,032'
$75.55 -
COMETIC Top End Gasket Kit - XL C9104
COMETIC
$75.55Extreme Sealing Technology (EST) gasket kits include embossed stainless steel head, base and rocker gaskets covered with a proprietary rubber material, Head gasket material allows heat to be drawn away from the combustion ring and dispatched evenly...09344659- SKU:
- 09344659
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- MODEL:
- EST
- THICKNESS IMPERIAL:
- 0,032'
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.1875'
- MATERIAL:
- STEEL
- MATERIAL:
- VITON
- STYLE:
- STANDARD
- BORE SIZE:
- 3,1875'
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- TOP END
- THICKNESS IMPERIAL:
- 0,031'
$75.55 -
COMETIC Top End Gasket Kit - XL C9116
COMETIC
$75.55Extreme Sealing Technology (EST) gasket kits include embossed stainless steel head, base and rocker gaskets covered with a proprietary rubber material, Head gasket material allows heat to be drawn away from the combustion ring and dispatched evenly...09344660- SKU:
- 09344660
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE SIZE IMPERIAL:
- 3.1875'
- MATERIAL:
- STEEL
- TYPE:
- TOP END
- UNITS:
- KIT
- MODEL:
- EST
- THICKNESS IMPERIAL:
- 0.031'
- THICKNESS IMPERIAL:
- 0.063'
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- STYLE:
- LOW COMPRESSION
- BORE SIZE:
- 3,1875'
- MATERIAL:
- ALUMINUM
- MATERIAL:
- VITON
$75.55Qty in Cart: 0Quantity:Price:$75.55Subtotal:
