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 Shifter Shaft Seal - FX 60641-74
JAMES GASKET
$19.90A leaking shifter shaft seal compromises your transmission's integrity and creates messy, costly fluid loss. The JAMES GASKET Shifter Shaft Seal FX 60641-74 delivers a factory-quality replacement...DS194462- SKU:
- DS194462
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- SHIFTER SHAFT
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$19.90 -
JAMES GASKET Metal Point Seal - Big Twin 83162-51
JAMES GASKET
$18.30A proper primary cover seal is critical to keeping oil where it belongs—inside your engine. The JAMES GASKET Metal Point Seal eliminates weeping and seepage at the primary cover, protecting your...DS194464- SKU:
- DS194464
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- CAMSHAFT
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$18.30 -
JAMES GASKET Mainshaft Seal 4 Speed - Big Twin 37741-82-A
JAMES GASKET
$10.95A compromised mainshaft seal leads to fluid leakage, accelerated wear on internal components, and potential catastrophic transmission failure. The JAMES GASKET Mainshaft Seal is engineered to...DS194468- SKU:
- DS194468
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- SEAL
- APPLICATION:
- MAIN DRIVE GEAR
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$10.95 -
JAMES GASKET Motor Gasket Kit - Twin Cam 17053-99-MLS
JAMES GASKET
$163.95A quality motor gasket kit is the foundation of engine reliability, preventing oil leaks and combustion gas escape that compromise performance and longevity. The JAMES GASKET Motor Gasket Kit for...09351092- SKU:
- 09351092
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- TYPE:
- ENGINE
$163.95 -
JAMES GASKET Motor Gasket Kit - Twin Cam 17055-05-X
JAMES GASKET
$130.95Engine gasket integrity is non-negotiable in high-performance applications—blow-by, oil weeping, and coolant leaks will destroy your build and sideline you from the track. The JAMES GASKET Motor...09351093- SKU:
- 09351093
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
$130.95 -
JAMES GASKET Top End Gasket Kit 17056-99-MLS
JAMES GASKET
$137.95A complete top-end gasket kit is essential for any engine rebuild—it's the foundation that prevents oil leaks, maintains compression, and ensures reliable performance across all operating conditions...09351094- SKU:
- 09351094
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- TYPE:
- PRIMARY COVER
$137.95 -
JAMES GASKET Rocker Cover Washer - XL/XR 6589
JAMES GASKET
$11.60A leaking rocker cover gasket compromises engine sealing and invites oil contamination into your combustion chamber—exactly what you don't need when you're pushing performance limits. The JAMES...09350363- SKU:
- 09350363
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- ROCKER COVER
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- UNITS:
- 20 PACK
$11.60 -
JAMES GASKET Breather Seal - XL/XR 17393-07
JAMES GASKET
$23.80A properly sealed breather system is critical to engine longevity—preventing oil contamination and maintaining consistent crankcase pressure directly impacts ring seal integrity and overall...09350371- SKU:
- 09350371
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- APPLICATION:
- BREATHER
- APPLICATION:
- ROCKER COVER
$23.80 -
JAMES GASKET Shifter Shaft Seal - FLT 37101-84-B
JAMES GASKET
$15.70A leaking shifter shaft seal compromises both your transmission's performance and your engine bay's cleanliness. JAMES GASKET's precision-engineered seal for FLT models delivers a reliable,...09350372- SKU:
- 09350372
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- APPLICATION:
- CLUTCH RELEASE LEVER
- UNITS:
- 5 PACK
$15.70 -
JAMES GASKET Intake Manifold Seal - Twin Cam 26992-99
JAMES GASKET
$11.95A compromised intake manifold seal introduces vacuum leaks that disrupt air-fuel ratios, reduce combustion efficiency, and cost you horsepower you've already built. This JAMES GASKET seal is...09350284- SKU:
- 09350284
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- INTAKE MANIFOLD
- PRODUCT NAME:
- SEAL
- UNITS:
- PAIR
$11.95 -
JAMES GASKET Start Yoke O-Ring - Big Twin/XL 31695-90
JAMES GASKET
$3.95A leaking starter yoke o-ring doesn't just waste your time—it compromises engine sealing integrity and can lead to costly oil seepage on your Big Twin or XL Sportster. JAMES Gasket's OEM-equivalent...09350285- SKU:
- 09350285
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- TYPE:
- STARTER MOTOR
- PRODUCT NAME:
- O-RING
- APPLICATION:
- YOKE
- UNITS:
- PAIR
$3.95 -
JAMES GASKET Lower Pushrod Cover O-Ring 11145-A
JAMES GASKET
$8.30Lower pushrod cover leaks compromise engine seal integrity and can lead to oil seepage that affects performance and longevity. The JAMES GASKET Lower Pushrod Cover O-Ring delivers a factory-quality...09350116- SKU:
- 09350116
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- APPLICATION:
- PUSHROD COVER
- UNITS:
- 10 PACK
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- APPLICATION:
- TAPPET GUIDE
$8.30 -
JAMES GASKET Main Drive Gear Spacer O-Ring - 6 Speed 11201
JAMES GASKET
$9.20Proper main drive gear spacing is critical to transmission longevity and shift quality in 6-speed boxes. This OEM-specification O-ring spacer maintains precise tolerances between gear engagement...09350117- SKU:
- 09350117
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- APPLICATION:
- MAIN DRIVE GEAR
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- TYPE:
- OIL
$9.20 -
JAMES GASKET Primary Drain Plug O-Ring 11324
JAMES GASKET
$8.40A leaking primary drain plug doesn't just waste oil—it compromises engine protection and creates a mess in your garage or on the track. The JAMES GASKET Primary Drain Plug O-Ring 11324 is a...09350118- SKU:
- 09350118
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- DRAIN PLUG
- PRODUCT NAME:
- O-RING
- UNITS:
- 10 PACK
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY COVER
$8.40 -
JAMES GASKET Starter/Case O-Ring - Big Twin 27444-00-Y
JAMES GASKET
$6.60A leaking starter O-ring isn't just messy—it compromises your engine's seal integrity and can lead to oil seepage that affects starter performance and overall reliability. The JAMES GASKET...09350119- SKU:
- 09350119
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- STARTER MOTOR
- PRODUCT NAME:
- O-RING
- UNITS:
- 5 PACK
- APPLICATION:
- CRANKCASE
- MATERIAL:
- VITON
- RIDING STYLE:
- STREET
- TYPE:
- OIL
$6.60 -
JAMES GASKET Starter Shaft Seal - Big Twin 12066-A
JAMES GASKET
$29.60A failing starter shaft seal compromises engine integrity and invites oil seepage into your primary case—a costly problem that compounds quickly in high-performance Big Twin applications. The JAMES...09350122- SKU:
- 09350122
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- STREET
- APPLICATION:
- STARTER SHAFT
- UNITS:
- 5 PACK
- PRODUCT NAME:
- SEAL
$29.60 -
JAMES GASKET Main Drive Gear - Twin Cam 12074
JAMES GASKET
$10.95A failing main drive gear shaft seal is a silent killer in Twin Cam engines—it allows oil to weep into areas where it has no business being, compromising both engine cleanliness and performance. The...09350123- SKU:
- 09350123
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- STREET
- APPLICATION:
- MAIN DRIVE GEAR
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
$10.95 -
JAMES GASKET Main Drive Gear Seal - Big Twin 12074-K
JAMES GASKET
$26.95Main drive gear seals are critical to preventing oil leakage from your Big Twin engine, protecting both your transmission fluid and your garage floor. A worn or failing seal can lead to costly...09350124- SKU:
- 09350124
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- APPLICATION:
- MAIN DRIVE GEAR
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
$26.95 -
JAMES GASKET Inner Primary Bolt Seal 31434-06
JAMES GASKET
$13.30Inner primary bolt seals are critical for preventing oil seepage at the crankcase, which can lead to messy leaks, contaminated engine bays, and potential oil loss during high-performance riding. The...09350127- SKU:
- 09350127
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- MOTOR
- PRODUCT NAME:
- SEAL
- UNITS:
- 10 PACK
- APPLICATION:
- INNER PRIMARY
- RIDING STYLE:
- STREET
$13.30 -
JAMES GASKET Trans to Engine Seal - Twin Cam 35607-06
JAMES GASKET
$15.95A leaking transmission-to-engine seal will compromise your oil pressure, reduce bearing protection, and leave a mess under your bike. The JAMES GASKET Trans to Engine Seal is engineered for Twin Cam...09350128- SKU:
- 09350128
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- APPLICATION:
- ENGINE
- PRODUCT NAME:
- SEAL
$15.95
