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 Float Bowl Gasket - Big Twin 27391-36
JAMES GASKET
$16.10A leaking or deteriorating float bowl gasket compromises fuel delivery precision and creates safety hazards on the track or street. The JAMES GASKET Float Bowl Gasket restores a reliable seal between your carburetor's float bowl and body, ensuring...DS173456- SKU:
- DS173456
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET
- TYPE:
- FLOAT BOWL
- UNITS:
- 10 PACK
$16.10 -
JAMES GASKET Tappet Block Gasket 18632-36
JAMES GASKET
$9.80When you're rebuilding your engine or performing a cam change, having the correct gasket and seal kit on hand eliminates guesswork and prevents costly mid-job delays. The JAMES GASKET Tappet Block Gasket 18632-36 is a complete, ready-to-install kit that...DS173454- SKU:
- DS173454
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MOUNTING POSITION:
- FRONT
- THICKNESS IMPERIAL:
- 0,031'
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,79 MM (0,031')
- THICKNESS METRIC:
- 0.79 MM
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- TYPE:
- TAPPET BLOCK
$9.80 -
JAMES GASKET Intake Manifold Gasket with Seal - Big Twin 27077-78-X
JAMES GASKET
$34.20A compromised intake manifold gasket means internal oil leakage, inconsistent fuel mixture, and potential engine damage on your Big Twin. The JAMES GASKET Intake Manifold Gasket with Seal delivers a factory-spec replacement that restores proper air-fuel...DS173446- SKU:
- DS173446
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MATERIAL:
- SILICONE
- MOUNTING POSITION:
- INTAKE MANIFOLD TO CARBURETOR
- MATERIAL:
- STEEL
- PRODUCT NAME:
- GASKET
- TYPE:
- INTAKE MANIFOLD
- FEATURES:
- BEADED
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
$34.20 -
JAMES GASKET Air/Back Plate Gasket 29095-95
JAMES GASKET
$13.90A compromised air/back plate gasket leads to vacuum leaks, rough idle, and inconsistent fuel mixture—issues that ripple through your entire engine management system. The JAMES GASKET Air/Back Plate Gasket 29095-95 seals this critical junction with...DS173445- SKU:
- DS173445
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- STYLE:
- AIR CLEANER
- TYPE:
- BACKPLATE
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
$13.90 -
JAMES GASKET Air/Backing Plate Gasket 29313-95
JAMES GASKET
$16.60A properly sealed air/backing plate gasket is critical to maintaining consistent engine performance and preventing oil leakage at a high-wear junction point. This JAMES GASKET OEM-specification gasket ensures a reliable seal without the guesswork of...DS173444- SKU:
- DS173444
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- FEATURES:
- INCLUDES ADHESIVE
- PRODUCT NAME:
- GASKET
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- STYLE:
- AIR CLEANER
- TYPE:
- BACKPLATE
- UNITS:
- 10 PACK
$16.60 -
JAMES GASKET Air Cleaner to Cab Gasket 29059-88-A
JAMES GASKET
$10.30A properly sealed air intake system is critical for maintaining consistent fuel mixture ratios and preventing unfiltered air from bypassing your engine's filtration. The JAMES GASKET Air Cleaner to Cab Gasket eliminates leakage between your air cleaner...DS173442- SKU:
- DS173442
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- FEATURES:
- INCLUDES ADHESIVE
- MOUNTING POSITION:
- AIR CLEANER TO CARBURETOR
- PRODUCT NAME:
- GASKET
- UNITS:
- 10 PACK
- MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- THICKNESS:
- 0,80 MM (0,030')
- THICKNESS IMPERIAL:
- 0,030'
- THICKNESS METRIC:
- 0.80 MM
- TYPE:
- CARBURETOR
- STYLE:
- AIR CLEANER
$10.30 -
JAMES GASKET Air Cleaner to Cab Gasket 29059-88-X
JAMES GASKET
$7.70A compromised air cleaner seal allows unfiltered air to bypass your intake system, reducing engine efficiency and increasing wear on internal components. The JAMES GASKET Air Cleaner to Cab Gasket creates a proper seal between your air cleaner assembly...DS173441- SKU:
- DS173441
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- AIR CLEANER TO CARBURETOR
- STYLE:
- AIR CLEANER
- TYPE:
- CARBURETOR
$7.70 -
JAMES GASKET Head Gasket with O-Ring .030" 16770-84-X
JAMES GASKET
$34.95A properly sealed cylinder head is non-negotiable for reliable engine performance and longevity. The JAMES GASKET Head Gasket with O-Ring delivers consistent compression sealing across thermal cycles, preventing coolant and oil seepage that can...DS173439- SKU:
- DS173439
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- MATERIAL:
- CARBON
- PRODUCT NAME:
- GASKET
- MATERIAL:
- GRAPHITE
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,036'
- BORE SIZE:
- -
- BORE SIZE IMPERIAL:
- -
- THICKNESS METRIC:
- 0.91 MM
- UNITS:
- SET
- TYPE:
- CYLINDER HEAD
$34.95 -
JAMES GASKET Head Gasket with O-Ring - .045" 16770-84-B
JAMES GASKET
$39.30A quality head gasket is fundamental to maintaining combustion chamber seal and preventing coolant or oil seepage that compromises engine reliability. The JAMES GASKET Head Gasket with O-Ring delivers the precision fitment and material integrity your...DS173438- SKU:
- DS173438
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BORE SIZE:
- -
- BORE SIZE IMPERIAL:
- -
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER HEAD
- UNITS:
- 5 PACK
- MATERIAL:
- GRAPHITE
- PRODUCT NAME:
- GASKET
- THICKNESS IMPERIAL:
- 0,045'
- THICKNESS METRIC:
- 1.14 MM
- MATERIAL:
- CARBON
$39.30 -
JAMES GASKET Cylinder Base Gasket - 3-5/8" 16777-86-S
JAMES GASKET
$14.10A reliable cylinder base gasket is critical to maintaining compression and preventing oil leakage at the engine block interface. The JAMES GASKET Cylinder Base Gasket eliminates the need for additional sealant, saving time during assembly and reducing...DS173437- SKU:
- DS173437
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- BORE SIZE IMPERIAL:
- 3.625'
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- THICKNESS METRIC:
- 0.51 MM
- PRODUCT NAME:
- GASKET
- TYPE:
- CYLINDER BASE
- MATERIAL:
- PAPER
- UNITS:
- 5 PACK
$14.10 -
JAMES GASKET Cylinder Base Gasket - Big Twin 16777-83-A
JAMES GASKET
$14.00A cylinder base gasket is critical to maintaining compression and preventing oil seepage at the engine block's most vulnerable junction. The JAMES GASKET Cylinder Base Gasket is engineered to seal reliably without additional gasket sealer, reducing...DS173436- SKU:
- DS173436
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- CYLINDER BASE
- DISPLACEMENT:
- 1340 CC
- THICKNESS METRIC:
- 0.51 MM
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,020'
- MATERIAL:
- PAPER
- PRODUCT NAME:
- GASKET
$14.00 -
JAMES GASKET Rocker Box Cork - Panhead 17541-48-C
JAMES GASKET
$39.60A quality rocker box gasket is essential to preventing oil leakage and maintaining proper engine sealing on your Panhead—especially critical since even small weeps can accumulate and compromise performance over time. The JAMES GASKET Rocker Box Cork...DS173435- SKU:
- DS173435
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- THICKNESS:
- 3,20 MM (0,125')
- THICKNESS METRIC:
- 3.20 MM
- THICKNESS IMPERIAL:
- 0,125'
- MATERIAL:
- CORK
- TYPE:
- ROCKER COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- 5 PACK
$39.60 -
JAMES GASKET Drain Plug/Oil Pump Cap O-Ring 11105-X
JAMES GASKET
$7.80A compromised drain plug o-ring is an invisible threat to your engine's health—it allows oil seepage that compounds into costly damage over time. The JAMES GASKET 11105-X is a precision replacement that restores a complete seal, preventing unwanted oil...DS173430- SKU:
- DS173430
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- APPLICATION:
- OIL PUMP
- SIZE:
- OVERSIZE
- APPLICATION:
- DRAIN PLUG
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- UNITS:
- 25 PACK
$7.80 -
JAMES GASKET Trans Double Lip Seal 37741-67-A
JAMES GASKET
$17.95Transmission seals are critical to maintaining hydraulic pressure and preventing costly fluid leaks that compromise performance and reliability. The JAMES GASKET Trans Double Lip Seal 37741-67-A is engineered with dual-lip geometry to provide superior...DS173426- SKU:
- DS173426
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
- APPLICATION:
- MAIN DRIVE GEAR
- RIDING STYLE:
- STREET
$17.95 -
JAMES GASKET Inner Primary Bearing Seal 12052-F
JAMES GASKET
$19.10The inner primary bearing seal is a critical component that prevents fluid leakage and contamination in your primary drivetrain, directly impacting clutch performance and overall reliability. A compromised seal can lead to oil loss, metal-on-metal...DS173424- SKU:
- DS173424
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- APPLICATION:
- INNER PRIMARY
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$19.10 -
JAMES GASKET Shifter Shaft Seal 12045-M
JAMES GASKET
$18.50A leaking shifter shaft seal compromises your transmission's integrity and can lead to costly fluid loss and contamination. The JAMES GASKET Shifter Shaft Seal 12045-M provides a reliable OEM-equivalent solution that restores a watertight seal at the...DS173423- SKU:
- DS173423
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- APPLICATION:
- SHIFTER SHAFT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- UNITS:
- 5 PACK
$18.50 -
JAMES GASKET Trans Gasket Kit - 4 Speed 33031-70
JAMES GASKET
$53.95A worn transmission gasket kit is one of the most common sources of fluid leaks and performance degradation in vintage and classic 4-speed transmissions. JAMES Gasket delivers OEM-quality sealing with precise tolerances that prevent costly fluid loss and...DS173418- SKU:
- DS173418
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- STREET
- STYLE:
- 4-SPEED
- TYPE:
- TRANSMISSION
- UNITS:
- KIT
$53.95 -
JAMES GASKET Oil Pump Rebuild Kit - FL 48-FL
JAMES GASKET
$16.95Oil pump failure can strand you at the track or leave you stranded on the street with catastrophic engine damage. The JAMES GASKET Oil Pump Rebuild Kit gives you a cost-effective alternative to replacing the entire assembly, allowing you to restore your...DS173410- SKU:
- DS173410
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- TYPE:
- OIL PUMP
$16.95 -
JAMES GASKET Mylar Gasket/Seal Kit 68-FL
JAMES GASKET
$16.95A worn oil pump compromises lubrication efficiency and can lead to catastrophic engine damage. The JAMES GASKET Mylar Gasket/Seal Kit 68-FL gives you everything needed to completely rebuild or re-bush your oil pump, restoring proper flow rates and system...DS173409- SKU:
- DS173409
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- OIL PUMP
$16.95 -
JAMES GASKET Paper Gasket/Seal Kit 81-FLH
JAMES GASKET
$16.95Oil pump failures compromise lubrication delivery and engine reliability—a risk no serious builder or racer can afford. The JAMES GASKET Paper Gasket/Seal Kit gives you OEM-quality replacement components to fully restore pump performance and seal...DS173408- SKU:
- DS173408
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- OIL PUMP
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$16.95
