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
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JAMES GASKET Inner Primary Bearing Seal - Big Twin 12052
JAMES GASKET
$18.10The inner primary bearing seal is a critical component that protects your Big Twin's primary drive system from contamination and fluid leakage. A compromised seal leads to accelerated bearing wear, potential catastrophic primary failure, and costly...DS174343- SKU:
- DS174343
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- UNITS:
- 5 PACK
- APPLICATION:
- INNER PRIMARY
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
$18.10 -
JAMES GASKET Starter Shaft Seal - Big Twin 12051
JAMES GASKET
$22.40A leaking starter shaft seal doesn't just cost you oil—it compromises engine reliability and creates a mess in your engine bay. The JAMES GASKET Starter Shaft Seal for Big Twin engines is engineered to eliminate seepage at the source, ensuring your...DS174342- SKU:
- DS174342
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- 5 PACK
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- STREET
- APPLICATION:
- STARTER
- PRODUCT NAME:
- SEAL
$22.40 -
JAMES GASKET Starter Housing O-Ring 11116
JAMES GASKET
$13.00A worn or degraded starter housing O-ring creates oil seepage, reduces seal integrity, and can compromise your engine's reliability during critical racing moments. The JAMES GASKET 11116 delivers a precision-engineered replacement that restores proper...DS174341- SKU:
- DS174341
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- O-RING
- UNITS:
- 25 PACK
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- APPLICATION:
- STARTER HOUSING
$13.00 -
JAMES GASKET Starter Bolt O-Ring - XL 11171
JAMES GASKET
$14.00A leaking starter seal can drain your oil and compromise engine reliability—especially under racing conditions where every drop counts. The JAMES GASKET Starter Bolt O-Ring eliminates weeping at the starter mounting point with a precision-engineered...DS174340- SKU:
- DS174340
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- O-RING
- UNITS:
- 25 PACK
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- APPLICATION:
- STARTER
$14.00 -
JAMES GASKET Starter Gasket - XL 31488-81
JAMES GASKET
$8.70A worn or compromised starter gasket can lead to oil leaks, contamination of electrical components, and starter failure—all costly problems that compromise reliability. The JAMES GASKET Starter Gasket XL 31488-81 provides a precision-engineered seal that...DS174338- SKU:
- DS174338
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS METRIC:
- 0.76 MM
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,030'
- TYPE:
- STARTER HOUSING
- UNITS:
- 10 PACK
$8.70 -
JAMES GASKET Float Bowl O-Ring 27324-83
JAMES GASKET
$21.50A worn or degraded float bowl O-ring compromises fuel system integrity, leading to fuel leaks, carburetor flooding, and unpredictable engine performance—especially critical in high-vibration racing environments. The JAMES GASKET Float Bowl O-Ring ensures...DS174337- SKU:
- DS174337
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- APPLICATION:
- CARBURETOR
- APPLICATION:
- FLOAT BOWL
$21.50 -
JAMES GASKET Compliance Fitting Gasket 29242-83
JAMES GASKET
$8.20Proper gasket fitment is critical to maintaining system integrity and preventing costly leaks that compromise performance and reliability. The JAMES GASKET Compliance Fitting Gasket 29242-83 delivers OEM-quality sealing with the precision manufacturing...DS174336- SKU:
- DS174336
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
$8.20 -
JAMES GASKET Carb Air Cleaner Gasket 29059-88
JAMES GASKET
$7.70A properly sealed carburetor air cleaner gasket is critical to maintaining fuel mixture accuracy and preventing unmetered air leaks that compromise engine tuning. The JAMES GASKET 29059-88 delivers the reliable sealing performance that precision-built...DS174335- SKU:
- DS174335
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,80 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.80 MM
- MOUNTING POSITION:
- AIR CLEANER TO CARBURETOR
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- STYLE:
- AIR CLEANER
- TYPE:
- CARBURETOR
$7.70 -
JAMES GASKET Oil Screen Pump O-Ring 11105
JAMES GASKET
$8.20A deteriorated oil screen pump O-ring compromises oil circulation and can lead to inadequate lubrication throughout your engine—risking catastrophic bearing damage. The JAMES GASKET Oil Screen Pump O-Ring 11105 is an OEM-equivalent replacement that...DS174334- SKU:
- DS174334
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- OIL PUMP
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- UNITS:
- 25 PACK
$8.20 -
JAMES GASKET Lower Pushrod O-Ring 11145
JAMES GASKET
$12.90Proper pushrod sealing is critical to maintaining oil pressure and preventing leakage in high-performance engines. The JAMES GASKET Lower Pushrod O-Ring ensures a reliable, long-lasting seal that withstands sustained RPM and demanding track conditions...DS174333- SKU:
- DS174333
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- APPLICATION:
- PUSHROD COVER
- PRODUCT NAME:
- O-RING
- MATERIAL:
- RUBBER
- APPLICATION:
- TAPPET GUIDE
- UNITS:
- 25 PACK
- RIDING STYLE:
- STREET
- TYPE:
- OIL
$12.90 -
JAMES GASKET Rocker Cover Washer - XL 63858-49
JAMES GASKET
$9.30A properly sealed rocker cover is fundamental to maintaining oil containment and preventing leaks that compromise engine cleanliness and performance. The JAMES GASKET Rocker Cover Washer XL 63858-49 delivers precision fitment and reliable sealing with...DS174332- SKU:
- DS174332
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- UNITS:
- 25 PACK
- APPLICATION:
- ROCKER COVER
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
$9.30 -
JAMES GASKET Cylinder Base Gasket - XL 16774-86
JAMES GASKET
$18.80A reliable cylinder base gasket is critical to maintaining proper compression and preventing oil leakage in high-performance engines. The JAMES GASKET XL 16774-86 delivers consistent sealing without requiring additional gasket sealant, saving time during...DS174331- SKU:
- DS174331
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- DISPLACEMENT:
- 1200 CC
- DISPLACEMENT:
- 1100 CC
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- UNITS:
- 10 PACK
$18.80 -
JAMES GASKET Cylinder O-Ring - XL 26432-76-A
JAMES GASKET
$15.70Cylinder head integrity depends on reliable sealing, and a compromised O-ring will lead to coolant leaks, compression loss, and potential engine damage. The JAMES GASKET Cylinder O-Ring XL 26432-76-A delivers precision-engineered sealing that meets OEM...DS174330- SKU:
- DS174330
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- CYLINDER HEAD
- MATERIAL:
- RUBBER
- THICKNESS IMPERIAL:
- 0.045'
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- UNITS:
- 10 PACK
$15.70 -
JAMES GASKET Valve Guide Gasket - Big Twin 18196-51
JAMES GASKET
$9.00Valve guide gaskets are critical sealing components that prevent oil leakage and combustion blowby in your Big Twin engine. A worn or failed gasket compromises compression and can lead to oil consumption issues that affect performance and engine...DS174329- SKU:
- DS174329
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- STREET
- TYPE:
- VALVE GUIDE
- UNITS:
- 20 PACK
- PRODUCT NAME:
- GASKET
$9.00 -
JAMES GASKET End Cover Gasket 36801-79
JAMES GASKET
$13.20A worn or damaged end cover gasket compromises engine sealing and can lead to oil leakage, reduced performance, and potential engine damage. The JAMES GASKET End Cover Gasket 36801-79 delivers OEM-quality sealing with precision manufacturing, ensuring...DS174326- SKU:
- DS174326
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- TYPE:
- CLUTCH RELEASE
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
$13.20 -
JAMES GASKET Inspection Cover Gasket - 5 Speed 34906-79
JAMES GASKET
$18.40A leaking inspection cover gasket compromises engine cleanliness and can lead to costly oil seepage issues. This genuine James gasket delivers a reliable, OEM-quality seal that eliminates guesswork and keeps your engine bay dry. Whether you're running a...DS174325- SKU:
- DS174325
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- STYLE:
- PRIMARY
- THICKNESS:
- 0,80 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.80 MM
- TYPE:
- INSPECTION COVER
$18.40Qty in Cart: 0Quantity:Price:$18.40Subtotal: -
JAMES GASKET Primary Cover Gasket 34901-94
JAMES GASKET
$111.70A failed primary cover gasket means oil seepage, potential engine damage, and costly downtime—especially if you're pushing your engine to its limits. The JAMES GASKET Primary Cover Gasket 34901-94 delivers OEM-spec reliability with silicone beading for a...DS174322- SKU:
- DS174322
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- TYPE:
- COVER
- FEATURES:
- BEADED
- PRODUCT NAME:
- GASKET
- STYLE:
- PRIMARY
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- UNITS:
- 5 PACK
$111.70 -
JAMES GASKET Primary Cover Gasket - .062" 34901-79-A
JAMES GASKET
$57.50A worn or failing primary cover gasket compromises engine sealing and can lead to oil leakage, contamination, and costly damage. The JAMES GASKET Primary Cover Gasket delivers OEM-equivalent performance with silicone beading for superior durability and a...DS174321- SKU:
- DS174321
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- STYLE:
- PRIMARY
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- UNITS:
- 5 PACK
- FEATURES:
- BEADED
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- TYPE:
- COVER
$57.50 -
JAMES GASKET Alternator Cover O-Ring - Big Twin 11147
JAMES GASKET
$26.80Proper alternator cover sealing prevents oil leakage and contamination of your electrical components, ensuring reliable charging system performance during extended rides and racing conditions. This OEM-replacement O-ring maintains a tight seal against...DS174316- SKU:
- DS174316
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- MOTOR
- PRODUCT NAME:
- O-RING
- APPLICATION:
- CHAIN COVER
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- UNITS:
- 10 PACK
$26.80 -
JAMES GASKET Chain Housing Cover O-Ring 11125
JAMES GASKET
$23.30A worn or compromised chain housing cover o-ring will allow oil seepage and contamination, directly impacting chain lubrication and drivetrain longevity. The JAMES GASKET Chain Housing Cover O-Ring 11125 is a precision-engineered replacement that...DS174315- SKU:
- DS174315
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- APPLICATION:
- CHAIN COVER
- TYPE:
- OIL
- APPLICATION:
- MOTOR
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
$23.30
