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
-
JAMES GASKET Rocker Cover Gasket 17537-38
JAMES GASKET
$16.60A failing rocker cover gasket is an open invitation to oil seepage and potential engine contamination—two problems that compound quickly if left unaddressed. The JAMES GASKET 17537-38 delivers a proven seal with strategically engineered elastomer beading...DS174416- SKU:
- DS174416
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- TYPE:
- INTAKE
- TYPE:
- ROCKER COVER
- MOUNTING POSITION:
- REAR
- UNITS:
- 10 PACK
$16.60Qty in Cart: 0Quantity:Price:$16.60Subtotal: -
JAMES GASKET Rocker Cover Gasket 17535-38
JAMES GASKET
$14.70A compromised rocker cover gasket means oil seepage, potential engine bay contamination, and the risk of oil starvation if leakage goes unaddressed. The JAMES GASKET 17535-38 delivers a reliable, long-lasting seal using domestic manufacturing and proven...DS174415- SKU:
- DS174415
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER COVER
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- FRONT
- MOUNTING POSITION:
- REAR
- TYPE:
- EXHAUST
- TYPE:
- INTAKE
- UNITS:
- 10 PACK
$14.70 -
JAMES GASKET Rocker Cover Seal 17475-38
JAMES GASKET
$23.70A failing rocker cover seal leads to oil seepage, engine bay contamination, and potential internal damage that compounds over time. The JAMES GASKET Rocker Cover Seal 17475-38 delivers reliable, long-lasting sealing performance with OEM-equivalent...DS174414- SKU:
- DS174414
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- ROCKER COVER
- PRODUCT NAME:
- SEAL
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
$23.70 -
JAMES GASKET Rubber Inner Rocker Cover Gasket 17358-84-A
JAMES GASKET
$20.30A leaking rocker cover gasket compromises engine bay cleanliness and can lead to oil contamination in critical areas. The JAMES GASKET Rubber Inner Rocker Cover Gasket delivers a reliable, long-lasting seal using proven elastomer technology and precision...DS174413- SKU:
- DS174413
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- RUBBER
- MOUNTING POSITION:
- INNER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- UNITS:
- 10 PACK
$20.30 -
JAMES GASKET Upper Rocker Cover Gasket Rubber 17356-84-A
JAMES GASKET
$42.80A leaking rocker cover gasket turns a simple maintenance task into an oil-soaked headache. The JAMES GASKET Upper Rocker Cover Gasket delivers a reliable, long-lasting seal that handles engine heat and vibration without compromising on easy installation...DS174412- SKU:
- DS174412
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- RUBBER
- MOUNTING POSITION:
- UPPER
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$42.80 -
JAMES GASKET Lower Rocker Cover Rubber - Big Twin 17355-84-A
JAMES GASKET
$42.80A worn or failing rocker cover gasket leads to oil seepage, engine bay mess, and potential internal damage if contaminants enter the crankcase. The JAMES GASKET Lower Rocker Cover Rubber delivers a reliable, long-lasting seal using dual elastomer coating...DS174411- SKU:
- DS174411
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- RUBBER
- UNITS:
- 5 PACK
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- ROCKER BOX
$42.80 -
JAMES GASKET Front Cylinder Base Gasket - Big Twin 16776-48
JAMES GASKET
$16.60A properly sealed cylinder base is non-negotiable for engine reliability—especially under high-load conditions where blow-by and oil weeping become costly problems. The JAMES GASKET Front Cylinder Base Gasket eliminates guesswork with a...DS174410- SKU:
- DS174410
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CYLINDER BASE
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,032'
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
$16.60 -
JAMES GASKET Base Gasket - 3-5/8" - Big Twin 16777-66-S
JAMES GASKET
$24.50A properly sealed engine base is non-negotiable for reliable Big Twin performance, and gasket failure leads to oil leakage, contamination, and potential engine damage. The JAMES GASKET Base Gasket eliminates guesswork with a precision-engineered design...DS174409- SKU:
- DS174409
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BORE SIZE IMPERIAL:
- 3.625'
- TYPE:
- CYLINDER BASE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- 10 PACK
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- STREET
$24.50 -
JAMES GASKET Front Base Gasket - FL/FX 16776-63
JAMES GASKET
$16.60A properly sealed engine base is fundamental to maintaining oil pressure and preventing leaks that compromise performance and engine longevity. The JAMES GASKET Front Base Gasket eliminates guesswork with a precision-fit design engineered for FL/FX...DS174408- SKU:
- DS174408
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- THICKNESS METRIC:
- 0.81 MM
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,032'
- TYPE:
- CYLINDER BASE
$16.60 -
JAMES GASKET Front/Rear Base Gasket - EL 16774-21
JAMES GASKET
$16.60A quality base gasket is fundamental to maintaining proper crankcase sealing and preventing oil leakage at critical engine interfaces. The JAMES GASKET Front/Rear Base Gasket eliminates the guesswork with a precision-engineered design that seats reliably...DS174405- SKU:
- DS174405
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- THICKNESS IMPERIAL:
- 0,031'
- UNITS:
- 10 PACK
- TYPE:
- CYLINDER BASE
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- PRODUCT NAME:
- GASKET
$16.60 -
JAMES GASKET Head Gasket - Big Twin 16773-85-T
JAMES GASKET
$59.20A head gasket failure can sideline your Big Twin engine and cost thousands in machine work. The JAMES GASKET Head Gasket delivers reliable sealing under extreme cylinder pressures and temperature cycling, keeping combustion contained where it belongs...DS174404- SKU:
- DS174404
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- DISPLACEMENT:
- 1200 CC
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,045'
- THICKNESS METRIC:
- 1.14 MM
- MATERIAL:
- TEFLON
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,14 MM (0,045')
- UNITS:
- 5 PACK
- DISPLACEMENT:
- 1340 CC
- TYPE:
- CYLINDER HEAD
$59.20 -
JAMES GASKET Big Bore Gasket Set - Big Twin 16770-86-S
JAMES GASKET
$49.95A proper gasket set is the foundation of any reliable big twin engine—factory seals degrade over time, leading to oil weeps, compression loss, and potential catastrophic failure. The JAMES GASKET Big Bore Gasket Set ensures you're sealing critical...DS174403- SKU:
- DS174403
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD BORE
- BORE SIZE IMPERIAL:
- 3.625'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- TYPE:
- CYLINDER HEAD
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- MATERIAL:
- TEFLON
$49.95 -
JAMES GASKET Fire Ring Head Gasket - Panhead 16770-48-X
JAMES GASKET
$48.95A proper head gasket seal is fundamental to engine reliability, and the JAMES GASKET Fire Ring Head Gasket delivers the durability Panhead engines demand. This U.S.-manufactured gasket uses a fire ring design to maintain consistent compression and...DS174402- SKU:
- DS174402
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,045'
- PRODUCT NAME:
- GASKET
- FEATURES:
- FIRE RING
- THICKNESS:
- 1,14 MM (0,045')
- THICKNESS METRIC:
- 1.14 MM
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
$48.95 -
JAMES GASKET Tappet Pin Cover O-Ring - XL 11176
JAMES GASKET
$3.00A worn or failing tappet pin cover O-ring compromises engine sealing and can lead to oil leakage and contamination in your valve train. The JAMES GASKET XL 11176 is a precision replacement that restores proper sealing integrity, ensuring your engine...DS174398- SKU:
- DS174398
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- APPLICATION:
- TAPPET GUIDE
- PRODUCT NAME:
- O-RING
- TYPE:
- PIN
- RIDING STYLE:
- STREET
- UNITS:
- 25 PACK
$3.00 -
JAMES GASKET Solenoid Mounting Air Control O-Ring 11170
JAMES GASKET
$17.20Precision air control requires dependable sealing at every connection point. This OEM-quality o-ring maintains consistent solenoid mounting integrity under variable boost pressures and thermal cycling, eliminating unwanted air leaks that compromise...DS174396- SKU:
- DS174396
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- O-RING
- UNITS:
- 25 PACK
- APPLICATION:
- CRANKSHAFT POSITION SENSOR
- RIDING STYLE:
- STREET
- TYPE:
- OIL
$17.20 -
JAMES GASKET Main Drive Gear O-Ring - FXST 11166
JAMES GASKET
$15.90A failing main drive gear seal compromises your entire drivetrain, allowing oil to weep into the primary case and degrading performance. The JAMES GASKET Main Drive Gear O-Ring replaces worn factory seals with OEM-equivalent quality, restoring a proper...DS174395- SKU:
- DS174395
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- UNITS:
- 25 PACK
- RIDING STYLE:
- STREET
- APPLICATION:
- MAIN DRIVE GEAR
- PRODUCT NAME:
- SEAL
$15.90 -
JAMES GASKET Air Control O-Ring 11140
JAMES GASKET
$10.70Air control o-rings are critical sealing components that prevent boost leaks and maintain system integrity in forced induction applications. A compromised or worn o-ring can result in inconsistent air delivery, loss of boost pressure, and degraded engine...DS174392- SKU:
- DS174392
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- O-RING
- TYPE:
- FRONT FORK
- UNITS:
- 25 PACK
- APPLICATION:
- AIR CONTROL CAP
- RIDING STYLE:
- STREET
$10.70 -
JAMES GASKET Pushrod Cover Cork 17955-48-D
JAMES GASKET
$9.95Pushrod cover gaskets are critical sealing components that prevent oil leakage around your engine's valve train—neglecting this maintenance item invites costly oil seepage that can compromise engine cleanliness and performance over time. The JAMES GASKET...DS174390- SKU:
- DS174390
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- APPLICATION:
- PUSHROD COVER
- PRODUCT NAME:
- SEAL
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
$9.95 -
JAMES GASKET Lower Neoprene Rocker Cover Gasket 17353-89
JAMES GASKET
$35.80A compromised rocker cover gasket doesn't just leak—it exposes your engine to contamination and oil loss that can degrade performance and damage internal components. The JAMES GASKET Lower Neoprene Rocker Cover Gasket uses a dual-elastomer design with...DS174389- SKU:
- DS174389
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- MATERIAL:
- NEOPRENE
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$35.80 -
JAMES GASKET Upper Neoprene Rocker Cover Gasket - XL 17354-89
JAMES GASKET
$35.10A failing rocker cover gasket means oil seepage, engine bay mess, and potential internal contamination—none of which you want. The JAMES GASKET Upper Neoprene Rocker Cover Gasket delivers a lasting, reliable seal with U.S.A.-made construction and...DS174388- SKU:
- DS174388
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- NEOPRENE
- MOUNTING POSITION:
- UPPER
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
$35.10
