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 Trans Gasket Kit - 5 Speed 33031-85
JAMES GASKET
$59.95A transmission gasket kit is critical infrastructure for maintaining fluid integrity and preventing costly leaks that compromise performance and engine longevity. The JAMES GASKET Trans Gasket Kit is engineered to factory specifications, ensuring a...DS173243- SKU:
- DS173243
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TRANSMISSION
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- STYLE:
- 5-SPEED
$59.95 -
JAMES GASKET Top End Gasket Kit - FX/FL 17034-66
JAMES GASKET
$78.95A top-end engine rebuild demands precision components that won't compromise your seal integrity under extreme operating conditions. JAMES GASKET's purpose-engineered gasket kit eliminates guesswork by delivering every critical seal, O-ring, and gasket...DS173242- SKU:
- DS173242
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
$78.95 -
JAMES GASKET Top End Gasket Kit - XL 17032-91
JAMES GASKET
$136.95A complete engine rebuild demands gaskets, seals, and O-rings that maintain compression and prevent fluid leakage under extreme operating conditions. JAMES GASKET's Top End Gasket Kit supplies OEM-quality components engineered to specification,...DS173241- SKU:
- DS173241
- Availability:
- Ships Same Business Day
- Weight:
- 0.64 LBS
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE IMPERIAL:
- 3.500'
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$136.95 -
JAMES GASKET Top End Gasket Kit - XL 17030-72-A
JAMES GASKET
$46.95A proper top-end gasket kit is non-negotiable for any engine rebuild—sealing failures lead to oil leaks, compression loss, and catastrophic engine damage. The JAMES GASKET Top End Gasket Kit delivers OEM-grade sealing surfaces with precision-cut...DS173240- SKU:
- DS173240
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- UNITS:
- KIT
- TYPE:
- TOP END
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
$46.95 -
JAMES GASKET Complete Motor Gasket Kit - FX/FL 17029-70
JAMES GASKET
$128.95A complete engine rebuild demands precision gaskets and seals that won't compromise your motor's integrity or leak under pressure. The JAMES GASKET Complete Motor Gasket Kit delivers OEM-quality components engineered to handle the demands of FX/FL...DS173239- SKU:
- DS173239
- Availability:
- Ships Same Business Day
- Weight:
- 1.63 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- COMPLETE
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$128.95 -
JAMES GASKET Trans Gasket/Seal Kit - Twin Cam 33031-99
JAMES GASKET
$52.95Transmission gasket and seal failures lead to costly fluid leaks, loss of pressure, and potential drivetrain damage—especially in high-performance applications where tolerances are tight. The JAMES GASKET Trans Gasket/Seal Kit ensures a proper seal...DS173238- SKU:
- DS173238
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION
$52.95 -
JAMES GASKET Air Cleaner Back Plate Gasket 29062-95-B
JAMES GASKET
$17.20A properly sealed air cleaner assembly is fundamental to maintaining consistent air-fuel ratios and preventing unmetered air from compromising engine performance. The JAMES GASKET Air Cleaner Back Plate Gasket ensures a complete seal between your air...DS173235- SKU:
- DS173235
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- STYLE:
- CARBURETOR
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- TYPE:
- BACKPLATE
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
$17.20 -
JAMES GASKET Umbrella Valve Seal - Twin Cam 26858-99
JAMES GASKET
$25.50Valve seal degradation leads to oil consumption, blue smoke, and compromised combustion—issues that demand a precision replacement, not a Band-Aid solution. The JAMES GASKET Umbrella Valve Seal restores proper oil control at the valve stem, eliminating...DS173232- SKU:
- DS173232
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- UMBRELLA VALVE
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- UNITS:
- 6 PACK
$25.50 -
JAMES GASKET Derby Cover O-Ring - Big Twin 25416-99
JAMES GASKET
$11.50A failing derby cover seal is an easy way to turn a clean engine bay into an oil-weeping mess. The JAMES GASKET Derby Cover O-Ring is a molded rubber beaded seal with a metal insert, engineered to create a reliable, long-lasting barrier against oil...DS173230- SKU:
- DS173230
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- APPLICATION:
- DERBY COVER
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- PRODUCT NAME:
- O-RING
- UNITS:
- 5 PACK
$11.50 -
JAMES GASKET Cam Gear - Quick Change - Twin Cam 25244-99-K
JAMES GASKET
$56.95Cam gear changes demand precision and reliability—any leak or misalignment can cost you race time and engine integrity. The JAMES GASKET Cam Gear Quick Change kit eliminates guesswork by bundling every seal, gasket, and O-ring you need for a complete,...DS173229- SKU:
- DS173229
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CAM CHANGE
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
$56.95 -
JAMES GASKET Cam Cover Gasket - Twin Cam 25244-99
JAMES GASKET
$34.10Cam cover gaskets are critical sealing components that prevent oil leakage from your engine's top end—a failure here leads to mess, contamination, and potential engine damage. The JAMES GASKET Twin Cam 25244-99 is OEM-equivalent replacement gasket...DS173228- SKU:
- DS173228
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- UNITS:
- 5 PACK
- MATERIAL:
- PAPER
- TYPE:
- CAM COVER
- RIDING STYLE:
- STREET
- FEATURES:
- BEADED
- MATERIAL:
- RUBBER
- PRODUCT NAME:
- GASKET
$34.10 -
JAMES GASKET Rocker Cover Gasket - Twin Cam 17386-99
JAMES GASKET
$29.95Rocker cover gaskets are a critical seal that directly impact oil retention and engine longevity—a marginal failure here leads to oil weeping, messy engine bays, and potential bearing damage. The JAMES GASKET 17386-99 combines a steel foundation with a...DS173223- SKU:
- DS173223
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- MATERIAL:
- STEEL
- TYPE:
- ROCKER BOX
- UNITS:
- PAIR
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- UPPER
$29.95 -
JAMES GASKET Motor Gasket Kit - Twin Cam 88" 17053-99
JAMES GASKET
$138.95A complete engine rebuild demands precision-engineered gaskets, seals, and O-rings that won't compromise your build's integrity or longevity. The JAMES GASKET Motor Gasket Kit delivers OEM-quality components designed specifically for Twin Cam 88"...DS173222- SKU:
- DS173222
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- GASKET KIT
- THICKNESS METRIC:
- 1.17 MM
- BORE SIZE IMPERIAL:
- 3.750'
- TYPE:
- MOTOR
- UNITS:
- KIT
- THICKNESS IMPERIAL:
- 0,046'
- TYPE:
- COMPLETE
- RIDING STYLE:
- STREET
$138.95 -
JAMES GASKET Top End Gasket Kit - Twin Cam 17052-99
JAMES GASKET
$125.95A complete top-end gasket kit is essential when rebuilding or refreshing your Twin Cam engine—it ensures proper sealing across all critical surfaces and prevents oil leakage that can compromise engine performance and longevity. JAMES GASKET delivers...DS173221- SKU:
- DS173221
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE SIZE IMPERIAL:
- 3.750'
- THICKNESS METRIC:
- 1.14 MM
- TYPE:
- TOP END
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- THICKNESS IMPERIAL:
- 0,045'
$125.95 -
JAMES GASKET Exhaust Port Gasket 17048-98
JAMES GASKET
$16.95A failing exhaust port gasket compromises both performance and reliability, allowing exhaust gases to escape where they shouldn't and creating unnecessary heat loss. The JAMES GASKET Exhaust Port Gasket 17048-98 delivers a precision seal that maintains...DS173220- SKU:
- DS173220
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- EXHAUST
- RIDING STYLE:
- STREET
$16.95 -
JAMES GASKET Head/Base Gasket Kit - Twin Cam 17047-98
JAMES GASKET
$78.95Gasket failure leads to oil leaks, compression loss, and catastrophic engine damage—especially in high-performance Twin Cam applications where heat and pressure are unforgiving. The JAMES GASKET Head/Base Gasket Kit eliminates guesswork by pairing...DS173219- SKU:
- DS173219
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- STANDARD
- THICKNESS IMPERIAL:
- -
- TYPE:
- CYLINDER HEAD
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- -
- MATERIAL:
- -
- STYLE:
- STANDARD BORE
$78.95 -
JAMES GASKET Rocker Cover Gasket Kit - Twin Cam 17033-99
JAMES GASKET
$81.95A worn rocker cover gasket is one of the most common sources of oil leaks in Twin Cam engines—and the JAMES GASKET Rocker Cover Gasket Kit eliminates that problem before it starts. This U.S.A.-made kit delivers reliable sealing geometry that matches OEM...DS173218- SKU:
- DS173218
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- ROCKER BOX
- UNITS:
- KIT
$81.95 -
JAMES GASKET Rocker Housing Gasket - Twin Cam 16719-99
JAMES GASKET
$29.95A failing rocker housing gasket compromises engine sealing and invites oil leakage that degrades performance and creates maintenance headaches. JAMES GASKET's Twin Cam design uses precision engineering and domestic manufacturing to deliver a dependable...DS173215- SKU:
- DS173215
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- PRODUCT NAME:
- GASKET
- FEATURES:
- BEADED
- MATERIAL:
- RUBBER
- MATERIAL:
- STEEL
- UNITS:
- PAIR
$29.95 -
JAMES GASKET Motor Sprocket Seal - Twin Cam 12068
JAMES GASKET
$19.80A worn or leaking motor sprocket seal is one of the most common sources of oil seepage on Twin Cam engines—and ignoring it accelerates damage to your timing components and creates a mess in your engine bay. The JAMES GASKET Motor Sprocket Seal...DS173214- SKU:
- DS173214
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- MOTOR SHAFT
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$19.80 -
JAMES GASKET Cam Support O-Ring - Twin Cam 11298
JAMES GASKET
$5.30Cam support o-rings are critical sealing components that prevent oil leakage around your Twin Cam's cam support system. A degraded or missing o-ring leads to messy leaks, potential oil starvation, and costly engine damage. The JAMES GASKET 11298 delivers...DS173212- SKU:
- DS173212
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- UNITS:
- 10 PACK
- PRODUCT NAME:
- O-RING
- APPLICATION:
- CAM SUPPORT
- RIDING STYLE:
- STREET
- TYPE:
- PLUG
$5.30
