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
-
JAMES GASKET Head Gasket with Silicon - 3-5/8" - .045" 16773-85-TS
JAMES GASKET
$59.20A quality head gasket is the foundation of cylinder sealing integrity—it's what stands between efficient combustion and catastrophic leak-down. The JAMES GASKET Head Gasket with Silicon delivers...DS174500- SKU:
- DS174500
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE SIZE:
- 3,625'
- BORE SIZE IMPERIAL:
- 3.625'
- THICKNESS:
- 1,14 MM (0,045')
- TYPE:
- CYLINDER HEAD
- MATERIAL:
- SILICONE
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.14 MM
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,045'
$59.20 -
JAMES GASKET Keihin Manifold Gasket - Big Twin 27077-78
JAMES GASKET
$9.50A deteriorating intake manifold gasket will kill your Big Twin's reliability and fuel atomization, leading to lean conditions, heat damage, and potential air leaks. The JAMES GASKET Keihin Manifold...DS174492- SKU:
- DS174492
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CARBURETOR
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- TYPE:
- INTAKE MANIFOLD
- UNITS:
- 10 PACK
$9.50 -
JAMES GASKET Shifter Shaft Seal 11148
JAMES GASKET
$19.81A leaking shifter shaft seal compromises your transmission's integrity and can lead to costly fluid loss and internal damage. The JAMES GASKET Shifter Shaft Seal 11148 delivers OEM-grade sealing...DS174489- SKU:
- DS174489
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- GEAR SHIFT LEVER
- TYPE:
- QUAD SEAL
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- X-RING
- UNITS:
- 25 PACK
$19.81 -
JAMES GASKET Starter Shaft Oil Seal - Big Twin 31341-80DL
JAMES GASKET
$14.50The starter shaft oil seal is a critical component that prevents oil leakage from your Big Twin engine's crankcase—a common failure point that can lead to messy garage floors and potential engine...DS174486- SKU:
- DS174486
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- APPLICATION:
- STARTER SHAFT
- UNITS:
- 5 PACK
$14.50 -
On Sale
JAMES GASKET Upper Rocker Cork - XL 17354-86
JAMES GASKET
Now: $16.00Was: $25.00A properly sealed upper rocker cover is non-negotiable for keeping oil where it belongs—inside your engine. This JAMES GASKET cork gasket combines proven materials with precision engineering to...DS174484- SKU:
- DS174484
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- PRODUCT NAME:
- GASKET
- MOUNTING POSITION:
- UPPER
- UNITS:
- 5 PACK
- MATERIAL:
- CORK
Now: $16.00Was: $25.00 -
JAMES GASKET Lower Rocker Cork - XL 17353-86
JAMES GASKET
$45.60A properly sealed rocker cover gasket is fundamental to preventing oil leakage and maintaining engine cleanliness—two factors that directly impact long-term reliability and performance. The JAMES...DS174483- SKU:
- DS174483
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
- TYPE:
- ROCKER BOX
- UNITS:
- 5 PACK
- PRODUCT NAME:
- GASKET
- MATERIAL:
- CORK
$45.60 -
JAMES GASKET Oil Pump Body Gasket - Big Twin 26245-41
JAMES GASKET
$14.00Oil seepage from your pump body isn't just messy—it's a sign of gasket failure that can lead to inadequate lubrication and catastrophic engine damage. The JAMES GASKET Oil Pump Body Gasket is...DS174480- SKU:
- DS174480
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- STYLE:
- BODY
- RIDING STYLE:
- STREET
- TYPE:
- OIL PUMP
- UNITS:
- 10 PACK
$14.00 -
JAMES GASKET Rear Base Gasket - FL/FX 16777-63
JAMES GASKET
$16.60A leaking rear base gasket compromises engine integrity and creates ongoing maintenance headaches. The JAMES GASKET Rear Base Gasket eliminates the need for gasket sealer, delivering a reliable,...DS174479- SKU:
- DS174479
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- THICKNESS METRIC:
- 0.81 MM
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,032'
- TYPE:
- CYLINDER BASE
$16.60 -
JAMES GASKET Kick Shaft Oil Seal - XL/Big Twin 33076-37
JAMES GASKET
$11.80A failing crankshaft oil seal is a silent threat to your engine's longevity—once it starts weeping, internal lubrication fails and bearing damage accelerates. The JAMES GASKET Kick Shaft Oil Seal is...DS174478- SKU:
- DS174478
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- 10 PACK
- APPLICATION:
- CRANKSHAFT
- APPLICATION:
- KICKSTARTER
- RIDING STYLE:
- STREET
$11.80 -
JAMES GASKET Shifter Cam Shaft Seal 34036-36
JAMES GASKET
$11.10A leaking shifter cam shaft seal compromises transmission reliability and creates costly fluid loss on the track and street. The JAMES GASKET Shifter Cam Shaft Seal 34036-36 delivers OEM-quality...DS174477- SKU:
- DS174477
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- 10 PACK
- APPLICATION:
- SHIFTER SHAFT
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- STREET
$11.10 -
JAMES GASKET Mainshaft Seal - Big Twin 12044-A
JAMES GASKET
$14.95The mainshaft seal is a critical component that prevents transmission fluid from leaking into your primary case, a common failure point on Big Twin engines. A worn or degraded seal will cause oil...DS174476- SKU:
- DS174476
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- STREET
- APPLICATION:
- MAIN DRIVE GEAR
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
$14.95 -
JAMES GASKET Main Drive Gear Seal 12013-A
JAMES GASKET
$9.50A leaking main drive gear seal can compromise your entire drivetrain, allowing oil loss and contamination that degrades performance and shortens component life. The JAMES GASKET Main Drive Gear Seal...DS174475- SKU:
- DS174475
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- UNITS:
- 5 PACK
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- APPLICATION:
- MAIN DRIVE GEAR
- APPLICATION:
- MAINSHAFT
$9.50 -
JAMES GASKET Pushrod Cork - Big Twin 37337-36
JAMES GASKET
$24.40A worn or failing pushrod cork gasket compromises engine sealing and can lead to oil leakage, increased blowby, and potential internal damage. JAMES GASKET's pushrod cork delivers reliable sealing...DS174474- SKU:
- DS174474
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- APPLICATION:
- CLUTCH PUSHROD
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- UNITS:
- 10 PACK
$24.40 -
JAMES GASKET Rocker Arm Cover Gasket 17541-48-A
JAMES GASKET
$27.50A rocker arm cover gasket is your first line of defense against oil seepage that compromises engine cleanliness and performance. When factory gaskets deteriorate or fail, oil weeps onto your engine...DS174470- SKU:
- DS174470
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS:
- 1,60 MM (0,062')
- TYPE:
- ROCKER COVER
- UNITS:
- 10 PACK
$27.50 -
JAMES GASKET Oil Seal for Supernut 35211-85-DL
JAMES GASKET
$24.70Transmission fluid leaks compromise performance and accelerate internal wear—a quality oil seal is your first line of defense. The JAMES GASKET Oil Seal for Supernut is engineered to maintain a...DS174458- SKU:
- DS174458
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- STYLE:
- 4-SPEED
- PRODUCT NAME:
- SEAL
- TYPE:
- SUPER NUT
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$24.70 -
JAMES GASKET Derby Cover Gasket Silicon - Big Twin 25416-70-X
JAMES GASKET
$55.40A leaking derby cover gasket will compromise your engine's appearance and allow oil seepage that invites corrosion and debris accumulation. The James Gasket Derby Cover Gasket in silicon delivers a...DS174457- SKU:
- DS174457
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- SILICONE
- UNITS:
- 10 PACK
- FEATURES:
- BEADED
- RIDING STYLE:
- STREET
- STYLE:
- PRIMARY
- THICKNESS IMPERIAL:
- 0,062'
- THICKNESS METRIC:
- 1.60 MM
- TYPE:
- DERBY COVER
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- THICKNESS:
- 1,60 MM (0,062')
$55.40 -
JAMES GASKET Trans Mainshaft Seal Kit - 4 Speed 37741-67-K
JAMES GASKET
$24.95Transmission seal degradation is one of the most common sources of fluid leaks on Big Twin engines, leading to costly damage if left unaddressed. The JAMES GASKET Trans Mainshaft Seal Kit gives you...DS174456- SKU:
- DS174456
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- APPLICATION:
- TRANSMISSION
- STYLE:
- 4-SPEED
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$24.95 -
JAMES GASKET Main Drive Gear Double Lip Seal 37741-82DL
JAMES GASKET
$13.95A worn main drive gear seal is an open invitation to oil leakage, reduced efficiency, and potential drivetrain damage. The JAMES GASKET Double Lip Seal 37741-82DL delivers OEM-grade sealing...DS174455- SKU:
- DS174455
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- APPLICATION:
- MAIN DRIVE GEAR
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$13.95 -
JAMES GASKET Shift Fork Shaft - Big Twin 34036-80
JAMES GASKET
$7.80A worn or damaged shift fork shaft compromises your transmission's reliability and shifts—exactly what you can't afford during competition or spirited riding. The JAMES GASKET Shift Fork Shaft is...DS174454- SKU:
- DS174454
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- TYPE:
- SHIFTER SHAFT
- UNITS:
- 10 PACK
$7.80Qty in Cart: 0Quantity:Price:$7.80Subtotal: -
JAMES GASKET Float Bowl O-Ring - XL,F 27889-78
JAMES GASKET
$21.00A properly sealed float bowl is critical to consistent fuel delivery and carburetor performance—any leak or degradation directly impacts your engine's tuning stability and fuel economy. The JAMES...DS174448- SKU:
- DS174448
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- FLOAT BOWL
- PRODUCT NAME:
- O-RING
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- APPLICATION:
- CARBURETOR
$21.00
