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 - FXD C9149
COMETIC
$209.95Every 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,...09341209- SKU:
- 09341209
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
- BORE SIZE:
- 3,875'
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,030'
- MATERIAL:
- STEEL
- TYPE:
- COMPLETE
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.875'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.76 MM
- UNITS:
- KIT
$209.95 -
COMETIC Primary Gasket Kit C9150
COMETIC
$121.75Cometic'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%...09341210- SKU:
- 09341210
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- TYPE:
- PRIMARY
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
$121.75 -
COMETIC Cam Cover Gasket - Big Twin C9302F5
COMETIC
$23.50COMETIC Cam Cover Gasket - Big Twin20111497- SKU:
- 20111497
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- RIDING STYLE:
- STREET
- TYPE:
- CAM COVER
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- UNITS:
- 5 PACK
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
$23.50 -
COMETIC Cam Cover Gasket - Big Twin C9334F5
COMETIC
$44.00COMETIC Cam Cover Gasket - Big Twin20111499- SKU:
- 20111499
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- CAM COVER
$44.00 -
COMETIC Cam Cover Gasket - XL C9311F5
COMETIC
$53.50COMETIC Cam Cover Gasket - XL20111501- SKU:
- 20111501
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 1.52 MM
- THICKNESS:
- 1,52 MM (0,060')
- THICKNESS IMPERIAL:
- 0.060'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- TYPE:
- CAM COVER
$53.50 -
COMETIC Cam Cover Gasket - XL C9313F5
COMETIC
$48.20COMETIC Cam Cover Gasket - XL20111502- SKU:
- 20111502
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0.060'
- TYPE:
- CAM COVER
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,52 MM (0,060')
- THICKNESS METRIC:
- 1.52 MM
- UNITS:
- 5 PACK
$48.20 -
COMETIC Pushrod O-Ring - M8 C9586-M8
COMETIC
$15.70Viton® rubber O-ring seals, Include proper quantity for one engine, Made in the U.S.A.09351030- SKU:
- 09351030
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- PUSHROD TUBE
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- UNITS:
- KIT
$15.70Qty in Cart: 0Quantity:Price:$15.70Subtotal: -
COMETIC Oil Pump Seal C10305
COMETIC
$10.95COMETIC Oil Pump Seal09351181- SKU:
- 09351181
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- MATERIAL:
- VITON
- TYPE:
- OIL PUMP
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
COMETIC Valve Stem Seal C10202
COMETIC
$15.80High-quality products for long-term reliability, Manufactured from premium fuel-resistant materials that will not creep, crack or become brittle, Made in the U.S.A.09350991- SKU:
- 09350991
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- VALVE COVER
- RIDING STYLE:
- STREET
- UNITS:
- KIT
$15.80 -
COMETIC Intake Seal C10203
COMETIC
$13.50Made in the U.S.A.09350992- SKU:
- 09350992
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- 4 PACK
- APPLICATION:
- INTAKE MANIFOLD
- RIDING STYLE:
- STREET
$13.50 -
COMETIC Throttle Body Seal C10204
COMETIC
$41.10Made in the U.S.A.09350993- SKU:
- 09350993
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- APPLICATION:
- THROTTLE BODY
- UNITS:
- KIT
$41.10 -
COMETIC Neutral Indicator Washer C9497
COMETIC
$6.70High-quality products for long-term reliability, Manufactured from premium fuel-resistant materials that will not creep, crack or become brittle, Made in the U.S.A.09350204- SKU:
- 09350204
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- NEUTRAL GEAR SWITCH
- UNITS:
- 10 PACK
- MATERIAL:
- NYLON
- APPLICATION:
- TRANSMISSION
- THICKNESS:
- 0,063'
- THICKNESS IMPERIAL:
- 0.063'
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
$6.70 -
COMETIC Camshaft Rubber Seal C9519
COMETIC
$5.30Manufactured from premium fuel-resistant materials that will not creep, crack or become brittle, Made in the U.S.A.09350206- SKU:
- 09350206
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- MATERIAL:
- RUBBER
- UNITS:
- 10 PACK
- PRODUCT NAME:
- SEAL
- APPLICATION:
- CAMSHAFT
- RIDING STYLE:
- STREET
- MATERIAL:
- VITON
$5.30Qty in Cart: 0Quantity:Price:$5.30Subtotal: -
COMETIC Main Shaft Seal - 5 Pack C9523
COMETIC
$16.90Made in the U.S.A.09350208- SKU:
- 09350208
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- APPLICATION:
- MAIN CRANKSHAFT
- UNITS:
- 5 PACK
$16.90 -
COMETIC Lower Rocker Cover Rubber Gasket C9280
COMETIC
$20.10Viton gaskets feature a stainless steel core with a .001"-thick coating of Viton rubber on both sides., Made in the U.S.A.09350224- SKU:
- 09350224
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- VITON
- UNITS:
- 5 PACK
- MOUNTING POSITION:
- LOWER
- MOUNTING POSITION:
- OUTER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$20.10 -
COMETIC Head Gasket - Big Twin C10120
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...09344739- SKU:
- 09344739
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
- BORE SIZE:
- 3,875'
- MATERIAL:
- LAYERED STEEL
- BORE SIZE IMPERIAL:
- 3.875'
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 1,02 MM (0,040')
- UNITS:
- PAIR
$61.90 -
COMETIC Complete Gasket Kit - Big Twin C10121
COMETIC
$169.00Every 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, Made...09344740- SKU:
- 09344740
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- BORE SIZE:
- 4,125'
- BORE SIZE IMPERIAL:
- 4.125'
- UNITS:
- KIT
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- TYPE:
- MOTOR
- THICKNESS IMPERIAL:
- 0,040'
- THICKNESS METRIC:
- 1.02 MM
$169.00Qty in Cart: 0Quantity:Price:$169.00Subtotal: -
COMETIC Complete Gasket Kit - Big Twin C10121-036
COMETIC
$169.00Every 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, Made...09344741- SKU:
- 09344741
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- BORE SIZE:
- 4,125'
- TYPE:
- MOTOR
- UNITS:
- KIT
- MATERIAL:
- STEEL
- THICKNESS IMPERIAL:
- 0,036'
- BORE SIZE IMPERIAL:
- 4.125'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 0.91 MM
- RIDING STYLE:
- STREET
$169.00Qty in Cart: 0Quantity:Price:$169.00Subtotal: -
COMETIC Head Gasket C10037
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...09344650- SKU:
- 09344650
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- BORE SIZE:
- 3,8125'
- THICKNESS:
- 1,02 MM (0,040')
- THICKNESS IMPERIAL:
- 0,040'
- TYPE:
- CYLINDER HEAD
- BORE SIZE IMPERIAL:
- 3.8125'
- THICKNESS METRIC:
- 1.02 MM
- UNITS:
- PAIR
- MATERIAL:
- LAYERED STEEL
$61.90 -
COMETIC Cylinder Base Gasket C10038
COMETIC
$33.55Cylinder base gasket for Sportster models09344651- SKU:
- 09344651
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE IMPERIAL:
- 3.8125'
- THICKNESS IMPERIAL:
- 0,020'
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,51 MM (0,020')
- MATERIAL:
- VITON
- THICKNESS METRIC:
- 0.51 MM
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- PAIR
$33.55
