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 Quad Seal 11165
JAMES GASKET
$23.60Transmission fluid leaks compromise both performance and reliability, leaving your engine vulnerable to damage and costly repairs. The JAMES GASKET Trans Quad Seal 11165 is engineered to eliminate seal failure points and maintain consistent fluid...DS174387- SKU:
- DS174387
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- APPLICATION:
- TRANSMISSION
- PRODUCT NAME:
- X-RING
- STYLE:
- 5-SPEED
- TYPE:
- QUAD SEAL
- UNITS:
- 25 PACK
- RIDING STYLE:
- STREET
$23.60 -
JAMES GASKET Cam Cover Gasket - Big Twin 25225-93
JAMES GASKET
$35.95Cam cover gaskets are critical sealing components that prevent oil leakage from your engine's valve train area—a common failure point that can lead to messy leaks and potential engine damage if ignored. A worn or deteriorated gasket compromises the seal...DS174386- SKU:
- DS174386
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 1340 CC
- PRODUCT NAME:
- GASKET
- TYPE:
- CAM COVER
- UNITS:
- 10 PACK
$35.95 -
JAMES GASKET Dipstick/Filler Cap O-Ring 62673-90
JAMES GASKET
$8.50A worn or degraded dipstick/filler cap O-ring will compromise your engine's oil sealing integrity, leading to leaks and potential contamination of your crankcase. This OEM-specification replacement from James Gasket ensures a proper seal at the dipstick...DS174385- SKU:
- DS174385
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- UNITS:
- 10 PACK
- PRODUCT NAME:
- O-RING
- APPLICATION:
- OIL TANK CAP
$8.50 -
JAMES GASKET Lower Dipstick Cover O-Ring - FXDB 62672-90
JAMES GASKET
$8.50A leaking dipstick cover O-ring is an easy fix that prevents oil seepage and keeps your engine bay clean. This OEM-specification replacement gasket ensures a proper seal on your Harley-Davidson's dipstick assembly, eliminating drips that can accumulate...DS174384- SKU:
- DS174384
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- PRODUCT NAME:
- O-RING
- APPLICATION:
- DIPSTICK
- TYPE:
- OIL
$8.50 -
JAMES GASKET Cam Cover Gasket - XL 25263-90
JAMES GASKET
$29.10A leaking cam cover gasket compromises engine sealing and invites oil contamination into critical upper-engine components. The JAMES GASKET XL 25263-90 delivers OEM-grade sealing performance with consistent compression retention, eliminating weeping and...DS174383- SKU:
- DS174383
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- THICKNESS IMPERIAL:
- 0,031'
- TYPE:
- CAM COVER
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- THICKNESS:
- 0,79 MM (0,031')
- PRODUCT NAME:
- GASKET
$29.10 -
JAMES GASKET Primary Cover Gasket - Silicon 60539-89-X
JAMES GASKET
$132.00A leaking primary cover gasket compromises engine sealing and invites contamination into your motor—exact fitment and material integrity are non-negotiable. The JAMES GASKET Primary Cover Gasket delivers OEM-equivalent performance with silicone beading...DS174382- SKU:
- DS174382
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY COVER
- THICKNESS IMPERIAL:
- 0.062'
$132.00 -
JAMES GASKET Intake Seal Kit 27002-89-K
JAMES GASKET
$17.95Intake seal degradation compromises combustion efficiency and allows vacuum leaks that rob your engine of power and precision. The JAMES GASKET Intake Seal Kit 27002-89-K restores a complete, airtight seal between your carburetor, intake manifold, and...DS174381- SKU:
- DS174381
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- THICKNESS:
- 40 MM
- UNITS:
- KIT
- APPLICATION:
- INTAKE MANIFOLD TO CARBURETOR
- RIDING STYLE:
- STREET
- STYLE:
- FOR ORIGINAL EQUIPMENT CARBS
- THICKNESS METRIC:
- 40 MM
- PRODUCT NAME:
- SEAL
$17.95 -
JAMES GASKET Primary Inspection Cover Gasket - Big Twin 60567-36
JAMES GASKET
$13.90Inspection cover leaks are a common culprit behind oil seepage and messy engine bays. The JAMES GASKET Primary Inspection Cover Gasket delivers a reliable, OEM-quality seal that stops weeping before it starts—keeping your engine compartment clean and...DS174380- SKU:
- DS174380
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- CORK
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- TYPE:
- INSPECTION COVER
$13.90 -
JAMES GASKET Trans Filler Plug O-Ring - Big Twin 11178
JAMES GASKET
$5.50A transmission filler plug o-ring might seem like a minor component, but it's critical to preventing fluid leakage and maintaining proper transmission pressure in your Big Twin engine. JAMES Gasket's replacement o-ring ensures a reliable seal that keeps...DS174379- SKU:
- DS174379
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- TYPE:
- TRANSMISSION
- APPLICATION:
- FILLER PLUG
- UNITS:
- 25 PACK
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
$5.50 -
JAMES GASKET Mainshaft 5 Speed O-Ring 11162
JAMES GASKET
$13.30A quality mainshaft O-ring seal is critical to maintaining shift quality and preventing fluid leakage in your 5-speed transmission. The JAMES GASKET mainshaft O-ring is engineered to OEM specifications, ensuring reliable sealing under high-RPM conditions...DS174378- SKU:
- DS174378
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- MAINSHAFT
- PRODUCT NAME:
- O-RING
- STYLE:
- 5-SPEED
- UNITS:
- 25 PACK
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- STREET
- TYPE:
- OIL
$13.30 -
JAMES GASKET Counter Shafter O-Ring 11115
JAMES GASKET
$13.30The counter shaft is one of the hardest-working components in your engine's transmission system, and a failed o-ring can compromise oil sealing and lead to costly leaks or internal damage. JAMES GASKET's Counter Shafter O-Ring 11115 delivers precision...DS174377- SKU:
- DS174377
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- O-RING
- UNITS:
- 25 PACK
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
$13.30 -
JAMES GASKET 5 Speed Shifter Shaft Seal 12045-DL
JAMES GASKET
$18.50Transmission fluid leaks around your shifter shaft will compromise hydraulic pressure, degrade shift quality, and accelerate internal wear. The JAMES GASKET 5 Speed Shifter Shaft Seal delivers a factory-engineered barrier that maintains fluid integrity...DS174376- SKU:
- DS174376
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- SHIFTER SHAFT
- UNITS:
- 5 PACK
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
$18.50 -
JAMES GASKET Shifter Shaft Cover Seal 12010
JAMES GASKET
$18.80A leaking shifter shaft cover compromises your transmission's integrity and invites contamination into critical drivetrain components. The JAMES GASKET Shifter Shaft Cover Seal 12010 delivers a precise, OEM-quality replacement that restores a watertight...DS174375- SKU:
- DS174375
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- SHIFTER SHAFT
- APPLICATION:
- TRANSMISSION
- PRODUCT NAME:
- SEAL
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
$18.80 -
JAMES GASKET Shifter O-Ring - FXST 11191
JAMES GASKET
$5.40A worn or damaged shifter o-ring compromises shift quality and allows unwanted fluid seepage, undermining the precision your bike demands. This JAMES GASKET replacement o-ring restores factory seal integrity and smooth shifting performance. Direct...DS174374- SKU:
- DS174374
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- O-RING
- UNITS:
- 25 PACK
- MATERIAL:
- RUBBER
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- APPLICATION:
- GEAR SHIFT LEVER
$5.40 -
JAMES GASKET Carb to Main Seal 27002-89
JAMES GASKET
$11.95A properly sealed carburetor-to-intake manifold interface is critical for maintaining consistent air-fuel mixture delivery and preventing vacuum leaks that rob your engine of performance. The JAMES GASKET Carb to Main Seal ensures a reliable, lasting...DS174373- SKU:
- DS174373
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- CARBURETOR
- APPLICATION:
- INTAKE MANIFOLD
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- SEAL
$11.95 -
JAMES GASKET End Cover Gasket - 5 Speed 36801-87-A
JAMES GASKET
$14.30A worn or leaking end cover gasket compromises your transmission's integrity, leading to fluid loss and potential internal damage. The JAMES GASKET End Cover Gasket ensures a proper seal on your 5-speed transmission, maintaining consistent hydraulic...DS174372- SKU:
- DS174372
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH RELEASE
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
$14.30 -
JAMES GASKET Float Bowl O-Ring 27577-88
JAMES GASKET
$16.40A properly sealed float bowl is critical to carburetor reliability and consistent fuel delivery—a failing O-ring will cause fuel leaks, performance issues, and potential fire hazards. The JAMES GASKET Float Bowl O-Ring is engineered to maintain a...DS174371- SKU:
- DS174371
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- CARBURETOR
- APPLICATION:
- FLOAT BOWL
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- MATERIAL:
- VITON
- PRODUCT NAME:
- O-RING
- UNITS:
- 5 PACK
$16.40 -
JAMES GASKET Front Tappet Block Gasket - Big Twin 18634-48-A/B
JAMES GASKET
$8.60A proper seal between your tappet block and engine cases is non-negotiable for oil containment and reliable operation. James Gasket's OEM-equivalent front tappet block gasket eliminates guesswork during cam changes or top-end rebuilds by providing the...DS174370- SKU:
- DS174370
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- TAPPET BLOCK
- PRODUCT NAME:
- GASKET
- MOUNTING POSITION:
- FRONT
- THICKNESS:
- 0,79 MM (0,031')
- THICKNESS IMPERIAL:
- 0,031'
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
$8.60 -
JAMES GASKET Clutch Cable O-Ring 11179
JAMES GASKET
$10.30A worn or degraded clutch cable O-ring can compromise shift precision and lead to cable binding or premature wear—critical issues when you're pushing your machine to its limits. The JAMES GASKET Clutch Cable O-Ring 11179 is engineered to maintain a...DS174369- SKU:
- DS174369
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- CLUTCH CABLE
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- UNITS:
- 25 PACK
- PRODUCT NAME:
- O-RING
$10.30 -
JAMES GASKET Intake Seal - Big Twin/XL 26995-86-A
JAMES GASKET
$22.80A compromised intake seal creates vacuum leaks that rob your Big Twin or XL of horsepower, increase fuel consumption, and can lead to hard starting and rough idle conditions. The JAMES GASKET Intake Seal is engineered to maintain a precise, airtight seal...DS174368- SKU:
- DS174368
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- APPLICATION:
- INTAKE MANIFOLD
$22.80
