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 Complete Gasket Kit - Softail C9221
COMETIC
$209.95COMETIC Complete Gasket Kit Softail C9221Every 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...09341657- SKU:
- 09341657
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- MATERIAL:
- STEEL
- UNITS:
- KIT
- MATERIAL:
- VITON
- TYPE:
- COMPLETE
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$209.95 -
COMETIC Complete Gasket Kit - FXD C9221-030
COMETIC
$209.95COMETIC Complete Gasket Kit FXD C9221-030Every 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...09341658- SKU:
- 09341658
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- VITON
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- RIDING STYLE:
- STREET
$209.95 -
COMETIC Complete Gasket Kit - FL C9222-030
COMETIC
$209.95COMETIC Complete Gasket Kit FL C9222-030Every 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...09341660- SKU:
- 09341660
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- UNITS:
- KIT
- MATERIAL:
- VITON
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
$209.95 -
COMETIC Top End Gasket - Twin Cam - 4-1/8" C9976
COMETIC
$150.10COMETIC Top End Gasket Twin Cam 4-1/8" C9976EST (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...09341662- SKU:
- 09341662
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- MATERIAL:
- RUBBER
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- KIT
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- TYPE:
- TOP END
- ENGINE TYPE:
- 4-STROKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 0.51 MM
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS IMPERIAL:
- 0,040'
$150.10 -
COMETIC Carb Back Plate Gasket C9626F
COMETIC
$13.50COMETIC Carb Back Plate Gasket C9626FAluminum Foamette Material gaskets feature an aluminum core and a chemically blown, compounded nitrile synthetic rubber coating that is bonded to the outside layer; do not require gasket sealer., Made in the U.S.A.09341342- SKU:
- 09341342
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- TYPE:
- CARBURETOR BACKING PLATE
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 10 PACK
- THICKNESS:
- 1,52 MM (0,060')
$13.50 -
COMETIC Filter Mount Gasket C9634F
COMETIC
$13.90COMETIC Filter Mount Gasket C9634FAluminum Foamette Material gaskets feature an aluminum core and a chemically blown, compounded nitrile synthetic rubber coating that is bonded to the outside layer; do not require gasket sealer., Made in the U.S.A.09341343- SKU:
- 09341343
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- AIR FILTER
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- TYPE:
- BACKPLATE
- UNITS:
- 10 PACK
$13.90 -
COMETIC Upper Rocker Box Rubber Gasket C9277
COMETIC
$23.20COMETIC Upper Rocker Box Rubber Gasket C9277Viton gaskets feature a stainless steel core with a .001"-thick coating of Viton rubber on both sides., Made in the U.S.A.09341346- SKU:
- 09341346
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- MATERIAL:
- VITON
- TYPE:
- ROCKER COVER
- MOUNTING POSITION:
- UPPER
- RIDING STYLE:
- STREET
$23.20Qty in Cart: 0Quantity:Price:$23.20Subtotal: -
COMETIC Upper Rocker Box Rubber Gasket C9278
COMETIC
$23.20COMETIC Upper Rocker Box Rubber Gasket C9278Viton gaskets feature a stainless steel core with a .001"-thick coating of Viton rubber on both sides., Made in the U.S.A.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
$23.20Qty in Cart: 0Quantity:Price:$23.20Subtotal: -
COMETIC Lower Rocker Box Rubber Gasket C9282
COMETIC
$23.20COMETIC Lower Rocker Box Rubber Gasket C9282Viton gaskets feature a stainless steel core with a .001"-thick coating of Viton rubber on both sides., Made in the U.S.A.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
$23.20Qty in Cart: 0Quantity:Price:$23.20Subtotal: -
COMETIC Rear Tapped Gasket - Big Twin C9297F
COMETIC
$5.30COMETIC Rear Tapped Gasket Big Twin C9297FMade in the U.S.A.09341351- SKU:
- 09341351
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- THICKNESS:
- 0,81 MM (0,032')
- UNITS:
- 10 PACK
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- TYPE:
- TAPPET GUIDE
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,032'
- THICKNESS METRIC:
- 0.81 MM
$5.30 -
COMETIC Front Tappet Gasket - Big Twin C9298F
COMETIC
$6.40COMETIC Front Tappet Gasket Big Twin C9298FMade in the U.S.A.09341352- SKU:
- 09341352
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,81 MM (0,032')
- TYPE:
- TAPPET GUIDE
- UNITS:
- 10 PACK
- THICKNESS METRIC:
- 0.81 MM
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- FRONT
- THICKNESS IMPERIAL:
- 0,032'
$6.40 -
COMETIC Head Gasket - .03" - Evo - 3.75" C9694
COMETIC
$61.90COMETIC Head Gasket .03" Evo 3.75" C9694Center 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...09341353- SKU:
- 09341353
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
- PRODUCT NAME:
- GASKET
- UNITS:
- PAIR
- BORE SIZE IMPERIAL:
- 3.750'
- THICKNESS IMPERIAL:
- 0,030'
- BORE SIZE:
- 3,750'
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,76 MM (0,030')
- TYPE:
- CYLINDER HEAD
$61.90 -
COMETIC Head Gasket -.04" - Evo - 3.75" C9695
COMETIC
$61.90COMETIC Head Gasket -.04" Evo 3.75" C9695Center 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...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
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Head Gasket - .03" - 3 13/16" C9692
COMETIC
$61.90COMETIC Head Gasket .03" 3 13/16" C9692Center 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...09341355- SKU:
- 09341355
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.8125'
- PRODUCT NAME:
- GASKET
- MATERIAL:
- LAYERED STEEL
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.76 MM
- BORE SIZE:
- 3,8125'
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
$61.90Qty in Cart: 0Quantity:Price:$61.90Subtotal: -
COMETIC Head Gasket - .04" - 3 13/16" C9693
COMETIC
$61.90COMETIC Head Gasket .04" 3 13/16" C9693Center 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...09341356- SKU:
- 09341356
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 1,02 MM (0,040')
- BORE SIZE:
- 3,8125'
- BORE SIZE IMPERIAL:
- 3.8125'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- LAYERED STEEL
- UNITS:
- PAIR
- THICKNESS METRIC:
- 1.02 MM
$61.90 -
COMETIC Cam Service Gasket Kit C9623F
COMETIC
$26.20COMETIC Cam Service Gasket Kit C9623FComponents 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.09341357- SKU:
- 09341357
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- TYPE:
- CAM CHANGE
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
$26.20 -
COMETIC Starter Motor Mount Gasket C9330F
COMETIC
$6.40COMETIC Starter Motor Mount Gasket C9330FMade in the U.S.A.09341371- SKU:
- 09341371
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 10 PACK
- THICKNESS:
- 1,52 MM (0,060')
- RIDING STYLE:
- STREET
- TYPE:
- STARTER HOUSING
- THICKNESS METRIC:
- 1.52 MM
$6.40Qty in Cart: 0Quantity:Price:$6.40Subtotal: -
COMETIC Shift Sleeve O-Ring C9484
COMETIC
$9.50COMETIC Shift Sleeve O-Ring C9484High-quality products for long-term reliability, Manufactured from premium fuel-resistant materials that will not creep or become brittle, Made in the U.S.A.09341372- SKU:
- 09341372
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- UNITS:
- 25 PACK
- PRODUCT NAME:
- O-RING
- APPLICATION:
- SHIFTER LEVER
$9.50 -
COMETIC Rocker Gasket - .020" C9576
COMETIC
$62.70COMETIC Rocker Gasket .020" C9576Viton gaskets feature a stainless steel core with a .001"-thick coating of Viton rubber on both sides., Made in the U.S.A.09340750- SKU:
- 09340750
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- TYPE:
- ROCKER BOX
- THICKNESS METRIC:
- 0.51 MM
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- THICKNESS:
- 0,51 MM (0,020')
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
$62.70 -
COMETIC Primary Gasket C9943F5
COMETIC
$83.50COMETIC Primary Gasket C9943F5COMETIC Primary Gasket09340747- SKU:
- 09340747
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- PRIMARY
- THICKNESS:
- 1,52 MM (0,060')
- UNITS:
- 5 PACK
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
$83.50
