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 Cam Cover Gasket - XL 25263-86
JAMES GASKET
$29.10A failing cam cover gasket can lead to oil seepage that compromises engine cleanliness and invites contamination into critical valve train components. This JAMES GASKET replacement restores a...DS174367- SKU:
- DS174367
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- DISPLACEMENT:
- 1200 CC
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- THICKNESS:
- 0,79 MM (0,031')
- THICKNESS IMPERIAL:
- 0,031'
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- TYPE:
- CAM COVER
- UNITS:
- 10 PACK
- DISPLACEMENT:
- 1100 CC
- DISPLACEMENT:
- 883 CC
$29.10 -
JAMES GASKET Shifter Shaft Seal - XL 37101-84
JAMES GASKET
$5.95A leaking shifter shaft seal compromises transmission integrity and can lead to costly fluid loss and internal damage. The JAMES GASKET Shifter Shaft Seal XL provides a reliable, OEM-quality...DS174366- SKU:
- DS174366
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
- APPLICATION:
- CLUTCH RELEASE LEVER
- APPLICATION:
- SHIFTER SHAFT
$5.95 -
JAMES GASKET Foot Peg Stud Gasket - XL 34624-77
JAMES GASKET
$6.30A reliable gasket is the foundation of any leak-free assembly, and foot peg studs demand precision sealing in high-temperature, high-vibration environments. The JAMES GASKET XL 34624-77 combines...DS174365- SKU:
- DS174365
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- THICKNESS:
- 0,76 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- PRODUCT NAME:
- GASKET
- TYPE:
- SHIFTER STUD BOSS
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.76 MM
$6.30 -
JAMES GASKET Primary Filler Plug O-Ring - XL 11139
JAMES GASKET
$10.40A worn or damaged primary filler plug O-ring compromises your engine's seal integrity, risking oil leakage and potential internal contamination. The JAMES GASKET Primary Filler Plug O-Ring XL 11139...DS174364- SKU:
- DS174364
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- INSPECTION COVER
- MATERIAL:
- RUBBER
- APPLICATION:
- FILLER
- UNITS:
- 25 PACK
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- TYPE:
- OIL
$10.40 -
JAMES GASKET Tappet Guide Lower O-Ring - XL 11168-A
JAMES GASKET
$19.40Precision valve train operation depends on proper tappet guide sealing, and a degraded o-ring compromises oil containment and camshaft stability. The JAMES GASKET Tappet Guide Lower O-Ring XL...DS174363- SKU:
- DS174363
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- TAPPET GUIDE
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- PRODUCT NAME:
- O-RING
- UNITS:
- 25 PACK
$19.40Qty in Cart: 0Quantity:Price:$19.40Subtotal: -
JAMES GASKET Tappet Guide Upper O-Ring - XL 11167-A
JAMES GASKET
$19.30A worn or compromised tappet guide O-ring compromises valve train sealing and can lead to oil leakage, increased blowby, and accelerated wear on critical engine components. The JAMES GASKET Tappet...DS174362- SKU:
- DS174362
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- TAPPET GUIDE
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- PRODUCT NAME:
- O-RING
- UNITS:
- 25 PACK
$19.30 -
JAMES GASKET Tappet Guide O-Ring - XL 11110
JAMES GASKET
$7.50Valve train integrity depends on precise sealing, and worn or degraded tappet guide o-rings create oil leakage and loss of critical lubrication to your valve actuation components. The JAMES GASKET...DS174361- SKU:
- DS174361
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- O-RING
- APPLICATION:
- LOWER TAPPET BLOCK
- UNITS:
- 25 PACK
- RIDING STYLE:
- STREET
- TYPE:
- OIL
$7.50 -
JAMES GASKET Rear Tappet Block Gasket - Big Twin 18633-48-A/C
JAMES GASKET
$8.60A leaking rear tappet block gasket can compromise your Big Twin's reliability and lead to costly oil seepage during critical rides or track sessions. This OEM-spec James Gasket delivers a...DS174360- SKU:
- DS174360
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- TAPPET BLOCK
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS METRIC:
- 0.79 MM
- THICKNESS:
- 0,79 MM (0,031')
- MOUNTING POSITION:
- REAR
- THICKNESS IMPERIAL:
- 0,031'
- UNITS:
- 10 PACK
$8.60 -
JAMES GASKET Lower Rocker Cover - XL 17353-86-A
JAMES GASKET
$44.90A quality rocker cover gasket is essential for preventing oil seepage that can compromise engine cleanliness and performance. The JAMES GASKET Lower Rocker Cover combines precision engineering with...DS174359- SKU:
- DS174359
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- UNITS:
- 5 PACK
- MOUNTING POSITION:
- LOWER
- PRODUCT NAME:
- GASKET
- MATERIAL:
- RUBBER
$44.90 -
JAMES GASKET Head Gasket - XL1100 16665-86
JAMES GASKET
$51.00A failing head gasket compromises combustion chamber sealing, leading to coolant leaks, oil contamination, and catastrophic engine damage. The JAMES GASKET Head Gasket for XL1100 models delivers...DS174357- SKU:
- DS174357
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- MATERIAL:
- -
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- BORE SIZE:
- -
- BORE SIZE IMPERIAL:
- -
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- TYPE:
- CYLINDER HEAD
$51.00 -
JAMES GASKET Muffler Junction Gasket - Big Twin 65721-85
JAMES GASKET
$14.60A leaking muffler junction gasket compromises both performance and aesthetics on your Big Twin—allowing exhaust gases to escape where they shouldn't and creating unwanted noise. This...DS174354- SKU:
- DS174354
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- MATERIAL:
- COPPER
- PRODUCT NAME:
- GASKET
- TYPE:
- MUFFLER CLAMP
$14.60 -
JAMES GASKET Primary Cover Gasket - Silicon 60538-81-C
JAMES GASKET
$91.60A quality primary cover gasket is critical to preventing oil seepage and maintaining proper engine sealing on your motorcycle. The JAMES GASKET Primary Cover Gasket delivers OEM-exceeding performance...DS174352- SKU:
- DS174352
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- COVER
- STYLE:
- PRIMARY
- THICKNESS METRIC:
- 1.60 MM
- UNITS:
- 5 PACK
- FEATURES:
- BEADED
- MATERIAL:
- SILICONE
- THICKNESS IMPERIAL:
- 0,062'
$91.60 -
JAMES GASKET Shifter Shaft Sleeve O-Ring - Big Twin 11117
JAMES GASKET
$19.30A worn or damaged shifter shaft sleeve o-ring compromises shift quality and can lead to fluid leakage in your Big Twin transmission. This JAMES GASKET replacement restores precise shift engagement...DS174351- SKU:
- DS174351
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- GEAR SHIFT LEVER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- O-RING
- TYPE:
- OIL
- UNITS:
- 25 PACK
$19.30 -
JAMES GASKET Primary Inspection Gasket 34906-85
JAMES GASKET
$25.40A reliable primary inspection gasket is essential for maintaining a leak-free seal on your derby or inspection cover, preventing oil seepage that compromises engine cleanliness and performance. The...DS174350- SKU:
- DS174350
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- TYPE:
- INSPECTION COVER
- FEATURES:
- BEADED
- RIDING STYLE:
- STREET
- STYLE:
- PRIMARY
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- MATERIAL:
- SILICONE
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 1,60 MM (0,062')
- UNITS:
- 5 PACK
$25.40 -
JAMES GASKET Primary Transmission Small Gasket 34903-79
JAMES GASKET
$17.60A failed transmission gasket means fluid leakage, loss of pressure, and potential catastrophic transmission failure. The JAMES GASKET Primary Transmission Small Gasket is engineered with MicroPore...DS174349- SKU:
- DS174349
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.80 MM
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,80 MM (0,030')
- TYPE:
- PRIMARY
- TYPE:
- TRANSMISSION
- STYLE:
- SMALL
- MATERIAL:
- PAPER
- MOUNTING POSITION:
- INNER
- PRODUCT NAME:
- GASKET
$17.60Qty in Cart: 0Quantity:Price:$17.60Subtotal: -
JAMES GASKET Primary Transmission Large Gasket 34902-79-A
JAMES GASKET
$40.90A reliable transmission gasket is the foundation of a leak-free drivetrain—and this JAMES GASKET primary unit delivers the durability required for high-performance applications. MicroPore gasket...DS174348- SKU:
- DS174348
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- THICKNESS METRIC:
- 0.80 MM
- PRODUCT NAME:
- GASKET
- STYLE:
- LARGE
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,80 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- TYPE:
- PRIMARY
- TYPE:
- TRANSMISSION
- MATERIAL:
- PAPER
$40.90 -
JAMES GASKET Cam Cover Gasket - XL 25263-00-X
JAMES GASKET
$37.30A leaking cam cover gasket compromises engine sealing, invites oil contamination, and creates maintenance headaches that pull you away from track time. The JAMES GASKET XL replacement restores proper...DS174347- SKU:
- DS174347
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- SILICONE
- PRODUCT NAME:
- GASKET
- TYPE:
- CAM COVER
- FEATURES:
- BEADED
- UNITS:
- 5 PACK
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
$37.30 -
JAMES GASKET Primary Cover Seal - Big Twin 31433-84-A
JAMES GASKET
$11.60A leaking primary cover seal compromises your engine's integrity and creates a mess in your garage or on the track. The JAMES GASKET Primary Cover Seal is engineered to maintain a consistent,...DS174346- SKU:
- DS174346
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- CLUTCH COVER
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- UNITS:
- 20 PACK
$11.60 -
JAMES GASKET Derby Cover O-Ring - Big Twin 25416-84
JAMES GASKET
$23.10A leaking derby cover isn't just messy—it's a sign that your seal has failed and oil is finding its way out of your engine. The James Gasket Derby Cover O-Ring delivers a reliable, OEM-quality seal...DS174345- SKU:
- DS174345
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- APPLICATION:
- DERBY COVER
- UNITS:
- 10 PACK
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- TYPE:
- OIL
$23.10 -
JAMES GASKET Primary Cover Gasket 60540-36
JAMES GASKET
$54.40A leaking primary cover gasket compromises engine sealing and invites oil contamination into critical drivetrain components. The JAMES GASKET Primary Cover Gasket 60540-36 delivers OEM-equivalent...DS174344- SKU:
- DS174344
- Availability:
- Ships Same Business Day
- Weight:
- 0.94 LBS
- MATERIAL:
- CORK
- PRODUCT NAME:
- GASKET
- TYPE:
- PRIMARY COVER
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
$54.40Qty in Cart: 0Quantity:Price:$54.40Subtotal:
