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 Primary Gasket with Silicon - 5 Speed 34901-79-B
JAMES GASKET
$110.70A faulty primary gasket compromises engine sealing and invites oil leakage into your crankcase—a costly failure on the track or street. The JAMES GASKET Primary Gasket with Silicon delivers OEM-equivalent performance with enhanced silicone beading for...DS174959- SKU:
- DS174959
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- TYPE:
- COVER
- FEATURES:
- BEADED
- MATERIAL:
- SILICONE
- PRODUCT NAME:
- GASKET
- STYLE:
- PRIMARY
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- UNITS:
- 5 PACK
$110.70 -
JAMES GASKET Primary Cover Gasket - .030" 34901-79
JAMES GASKET
$77.40A compromised primary cover gasket will leak oil and compromise engine aesthetics—this JAMES gasket delivers OEM-equivalent sealing performance with proven silicone beading technology. Whether you're rebuilding a motor or replacing a failed gasket, the ...DS174958- SKU:
- DS174958
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- THICKNESS METRIC:
- 0.80 MM
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,030'
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- TYPE:
- COVER
- PRODUCT NAME:
- GASKET
- STYLE:
- PRIMARY
$77.40 -
JAMES GASKET Primary Gasket Kit 34955-75-K
JAMES GASKET
$33.95A properly sealed primary gasket is non-negotiable for maintaining consistent pressure, preventing fluid seepage, and ensuring reliable engine performance. The JAMES GASKET Primary Gasket Kit 34955-75-K delivers OEM-equivalent quality with reinforced...DS174956- SKU:
- DS174956
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- FEATURES:
- BEADED
- MATERIAL:
- SILICONE
- TYPE:
- PRIMARY COVER
- UNITS:
- KIT
$33.95 -
JAMES GASKET Primary Gasket Kit 34955-89-K
JAMES GASKET
$33.95A reliable primary gasket kit is foundational to preventing oil seepage and maintaining crankcase integrity under sustained high RPM operation. The JAMES GASKET Primary Gasket Kit 34955-89-K delivers OEM-equivalent sealing performance with...DS174955- SKU:
- DS174955
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- FEATURES:
- BEADED
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- SILICONE
- TYPE:
- PRIMARY COVER
- UNITS:
- KIT
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
$33.95 -
JAMES GASKET Primary Gasket Kit 34901-79-K
JAMES GASKET
$67.95A properly sealed primary gasket is non-negotiable for maintaining compression, preventing oil weeping, and ensuring reliable engine performance over extended service intervals. The JAMES GASKET Primary Gasket Kit 34901-79-K delivers OEM-spec sealing...DS174954- SKU:
- DS174954
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- MATERIAL:
- SILICONE
- TYPE:
- PRIMARY COVER
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- FEATURES:
- BEADED
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- MATERIAL:
- PAPER
$67.95 -
JAMES GASKET Primary Gasket Kit 34901-85-K
JAMES GASKET
$67.95A leaking primary gasket compromises engine sealing and invites oil contamination into critical engine areas. This JAMES GASKET kit delivers OEM-specification reliability with enhanced silicone beading, ensuring a tight seal that holds up through...DS174953- SKU:
- DS174953
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- FEATURES:
- BEADED
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,062'
- PRODUCT NAME:
- GASKET KIT
- MATERIAL:
- SILICONE
- TYPE:
- PRIMARY COVER
- UNITS:
- KIT
- MATERIAL:
- PAPER
- THICKNESS METRIC:
- 1.60 MM
$67.95 -
JAMES GASKET Primary Gasket Kit 34901-94-K
JAMES GASKET
$75.95A properly sealed primary gasket is critical to preventing oil leakage and maintaining consistent engine performance under racing conditions. The JAMES GASKET Primary Gasket Kit delivers OEM-equivalent sealing with silicone beading technology, ensuring...DS174952- SKU:
- DS174952
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- PRIMARY COVER
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- FEATURES:
- BEADED
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- MATERIAL:
- SILICONE
$75.95 -
JAMES GASKET Primary Gasket Kit 60539-89-KX
JAMES GASKET
$96.95A primary gasket failure can compromise your entire engine assembly, leading to oil weeping, reduced compression, and costly downtime. The JAMES GASKET Primary Gasket Kit 60539-89-KX delivers OEM-spec sealing with silicone beading technology that handles...DS174951- SKU:
- DS174951
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- FEATURES:
- BEADED
- MATERIAL:
- SILICONE
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- TYPE:
- PRIMARY COVER
- UNITS:
- KIT
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
$96.95 -
JAMES GASKET Primary Gasket Kit 60539-94-K
JAMES GASKET
$96.95A compromised primary gasket doesn't just leak—it undermines engine reliability and invites costly repairs. The JAMES GASKET Primary Gasket Kit delivers OEM-grade sealing performance with silicone beading technology, ensuring your engine compartment...DS174950- SKU:
- DS174950
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET KIT
- FEATURES:
- BEADED
- MATERIAL:
- SILICONE
- THICKNESS IMPERIAL:
- 0,062'
- TYPE:
- PRIMARY COVER
- UNITS:
- KIT
- THICKNESS METRIC:
- 1.60 MM
- RIDING STYLE:
- STREET
$96.95 -
JAMES GASKET Head/Base Gasket - Big Twin 16770-84-A
JAMES GASKET
$42.95Head and base gasket failure compromises combustion integrity, bleeds performance, and risks catastrophic engine damage. James Gasket's OEM-matched kits eliminate guesswork with precision-cut gaskets and O-rings engineered specifically for Big Twin...DS174924- SKU:
- DS174924
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- MATERIAL:
- TEFLON
- THICKNESS IMPERIAL:
- 0,032'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,045'
- PRODUCT NAME:
- GASKET
- STYLE:
- STANDARD BORE
- BORE SIZE IMPERIAL:
- 3.500'
- THICKNESS METRIC:
- 0.81 MM
- THICKNESS METRIC:
- 1.14 MM
- TYPE:
- CYLINDER BASE
- TYPE:
- CYLINDER HEAD
- UNITS:
- KIT
$42.95 -
JAMES GASKET Upper Rocker Cover Cork Gasket - Big Twin 17356-84
JAMES GASKET
$45.60A leaking rocker cover gasket compromises engine sealing and invites oil contamination into your Big Twin engine. The JAMES GASKET Upper Rocker Cover Cork Gasket delivers a reliable, long-lasting seal using proven materials and engineering—eliminating...DS174916- SKU:
- DS174916
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- CORK
- TYPE:
- ROCKER BOX
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- UPPER
$45.60 -
JAMES GASKET Inner Rocker Cover Cork Gasket 17358-84
JAMES GASKET
$20.90A leaking rocker cover gasket means oil seepage, potential engine bay mess, and the risk of contamination—problems that compound quickly if left unaddressed. The JAMES GASKET Inner Rocker Cover Cork Gasket delivers a reliable, long-lasting seal using...DS174915- SKU:
- DS174915
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- INNER
- PRODUCT NAME:
- GASKET
- MATERIAL:
- CORK
- TYPE:
- ROCKER BOX
- UNITS:
- 10 PACK
$20.90 -
JAMES GASKET Cylinder/Base Gasket Set - Big Twin 16770-66-S
JAMES GASKET
$34.95A properly sealed engine is the foundation of reliable power delivery and longevity. The JAMES GASKET Cylinder/Base Gasket Set ensures your Big Twin maintains pressure integrity across combustion cycles, eliminating compression leaks that rob performance...DS174914- SKU:
- DS174914
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- THICKNESS IMPERIAL:
- 0,045'
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,032'
- THICKNESS METRIC:
- 1.14 MM
- BORE SIZE IMPERIAL:
- 3.625'
- RIDING STYLE:
- STREET
- STYLE:
- STANDARD BORE
- THICKNESS METRIC:
- 0.81 MM
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- TEFLON
$34.95 -
JAMES GASKET Head Gasket - Teflon - .32" - XL 16769-73-T
JAMES GASKET
$39.10A head gasket is critical to maintaining compression and preventing coolant or oil seepage into the combustion chamber—failure here means catastrophic engine damage. The JAMES GASKET Teflon head gasket delivers reliable sealing with a .32" thickness...DS174913- SKU:
- DS174913
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- DISPLACEMENT:
- 1000 CC
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- THICKNESS IMPERIAL:
- 0,046'
- MATERIAL:
- TEFLON
- THICKNESS:
- 1,17 MM (0,046')
- THICKNESS METRIC:
- 1.17 MM
$39.10 -
JAMES GASKET Head Gasket V2 - Big Twin 16773-85
JAMES GASKET
$59.20A head gasket failure can compromise your engine's integrity and leave you stranded. The JAMES GASKET Head Gasket V2 is engineered to maintain a reliable seal under extreme combustion pressures and temperature cycling, giving you confidence in your Big...DS174912- SKU:
- DS174912
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE SIZE:
- -
- MATERIAL:
- -
- UNITS:
- 5 PACK
- BORE SIZE IMPERIAL:
- -
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- TYPE:
- CYLINDER HEAD
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
$59.20 -
JAMES GASKET Fire Ring Head Gasket - FL 16770-66-X
JAMES GASKET
$39.95A head gasket is the critical seal between your engine block and cylinder head—compromise here, and you're looking at coolant leaks, combustion blowby, and catastrophic engine damage. The JAMES GASKET Fire Ring Head Gasket delivers the reliability and...DS174911- SKU:
- DS174911
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER HEAD
- UNITS:
- PAIR
- FEATURES:
- FIRE RING
- RIDING STYLE:
- STREET
$39.95 -
JAMES GASKET Trans Seal Kit - Big Twin 35230-39-K
JAMES GASKET
$24.95Transmission seal failure is one of the most common sources of fluid leaks on Big Twin motors, and once a seal starts weeping, it only gets worse. The JAMES GASKET Trans Seal Kit eliminates guesswork by providing OEM-quality replacement seals engineered...DS174909- SKU:
- DS174909
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- APPLICATION:
- MAIN DRIVE GEAR
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
- STYLE:
- DOUBLE LIP
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL KIT
- APPLICATION:
- TRANSMISSION
$24.95 -
JAMES GASKET Trans Seal Kit - Big Twin 37741-82-K
JAMES GASKET
$24.95A leaking transmission seal can transform a routine ride into an expensive repair bill. This JAMES GASKET Trans Seal Kit addresses the root cause—worn, deteriorated seals—with precision-engineered replacements that restore leak-free operation and protect...DS174908- SKU:
- DS174908
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL KIT
- STYLE:
- 4-SPEED
- UNITS:
- KIT
- APPLICATION:
- TRANSMISSION
- STYLE:
- DOUBLE LIP
$24.95 -
JAMES GASKET Trans Seal Kit - Big Twin 12050-K
JAMES GASKET
$26.95Transmission seal failure leads to fluid loss, gear slippage, and costly internal damage—problems that compound quickly on the street or track. The JAMES GASKET Trans Seal Kit provides OEM-quality sealing across all critical contact points, ensuring your...DS174907- SKU:
- DS174907
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL KIT
- STYLE:
- 4-SPEED
- UNITS:
- KIT
- APPLICATION:
- TRANSMISSION
- STYLE:
- 5-SPEED
$26.95 -
JAMES GASKET Trans Seal Kit - Big Twin 12067-AK
JAMES GASKET
$26.95Transmission seal failure leads to oil leakage, loss of hydraulic pressure, and costly internal damage—problems that compound quickly under riding stress. The JAMES GASKET Trans Seal Kit restores critical sealing integrity across your Big Twin...DS174906- SKU:
- DS174906
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- TRANSMISSION
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- STYLE:
- 5-SPEED
- STYLE:
- 4-SPEED
$26.95
