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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EASTERN MOTORCYCLE PARTS Spacer A-24002-70
EASTERN MOTORCYCLE PARTS
$36.46Proper spacing is critical to engine reliability and performance—misaligned components lead to premature wear, vibration, and catastrophic failure. The EASTERN MOTORCYCLE PARTS Spacer A-24002-70 delivers precision-engineered spacing that ensures correct...DS195172- SKU:
- DS195172
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHAFT SPACER
- TYPE:
- MOTOR SPROCKET
- UNITS:
- EACH
$36.46 -
EASTERN MOTORCYCLE PARTS Bearing Retaining Washer - .065" - Big Twin A-35131-80
EASTERN MOTORCYCLE PARTS
$21.60Bearing retaining washers are critical wear items that prevent axial movement and maintain proper bearing preload in your transmission. Over time, these washers degrade from constant friction and thermal cycling, leading to bearing play that compromises...DS194179- SKU:
- DS194179
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- STYLE:
- 4-SPEED
- THICKNESS METRIC:
- 1.65 MM
- THICKNESS:
- 1,65 MM (0,065')
- TYPE:
- BEARING RETAINING
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- THICKNESS IMPERIAL:
- 0,065'
- TYPE:
- MAINSHAFT
- UNITS:
- 5 PACK
$21.60 -
EASTERN MOTORCYCLE PARTS 4-Speed Gear Spacers - XL A-35809-58
EASTERN MOTORCYCLE PARTS
$14.00A properly spaced gear train is fundamental to reliable power delivery in 2-stroke ATV engines. These Eastern Motorcycle Parts spacers maintain critical tolerances between gears, ensuring smooth engagement across all four speeds and reducing wear on your...DS194321- SKU:
- DS194321
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- SPACER
- TYPE:
- 2ND GEAR
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$14.00 -
EASTERN MOTORCYCLE PARTS Retaining Ring A-35337-56
EASTERN MOTORCYCLE PARTS
$6.70Retaining rings are critical fastening components that secure shafts, bearings, and other cylindrical parts in their bores—without the right ring, you risk catastrophic component failure mid-race or ride. The EASTERN MOTORCYCLE PARTS Retaining Ring...DS194324- SKU:
- DS194324
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- RETAINING RING
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
$6.70 -
EASTERN MOTORCYCLE PARTS Roller Bearings A-35363-52
EASTERN MOTORCYCLE PARTS
$13.50Precision roller bearings are the backbone of reliable drivetrain performance, and Eastern Motorcycle Parts A-35363-52 units deliver the tight tolerances and durability that serious riders demand. Whether you're rebuilding a transmission, installing a...DS194326- SKU:
- DS194326
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- TYPE:
- ROLLER BEARING
- UNITS:
- 5 PACK
$13.50 -
EASTERN MOTORCYCLE PARTS Bearing Retaining Ring A-35113-52
EASTERN MOTORCYCLE PARTS
$8.00Bearing retaining rings are critical components that keep your bearing assemblies secure and properly positioned during high-stress operation. A quality retaining ring prevents axial movement and bearing collapse, which can lead to catastrophic...DS194327- SKU:
- DS194327
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- RETAINING RING
- UNITS:
- 10 PACK
$8.00 -
EASTERN MOTORCYCLE PARTS Clutch Hub Bearing Rollers A-9540A
EASTERN MOTORCYCLE PARTS
$11.95Clutch hub bearing rollers are critical wear components that directly impact clutch engagement smoothness and overall drivetrain reliability. A worn or damaged set will cause sluggish lever response, inconsistent power delivery, and premature clutch...DS195005- SKU:
- DS195005
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- BEARING ROLLER
- TYPE:
- CLUTCH HUB
- UNITS:
- 20 PACK
$11.95 -
EASTERN MOTORCYCLE PARTS Idler Gear Stud with Bushing A-25791-77
EASTERN MOTORCYCLE PARTS
$26.95The idler gear stud and bushing assembly is critical to maintaining proper gear mesh alignment and reducing drivetrain noise and wear. A worn or damaged idler gear bushing compromises engine efficiency and can lead to costly secondary damage if left...DS195007- SKU:
- DS195007
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- STUD
- UNITS:
- EACH
- PRODUCT NAME:
- BUSHING
- RIDING STYLE:
- STREET
- TYPE:
- IDLER GEAR
$26.95 -
EASTERN MOTORCYCLE PARTS Cam Cover Bushing A-25581-36
EASTERN MOTORCYCLE PARTS
$37.95A worn or damaged cam cover bushing compromises valve train precision and can lead to oil leakage, increased noise, and accelerated wear on surrounding components. This OEM-spec Eastern Motorcycle Parts bushing restores proper fit and alignment, ensuring...DS194147- SKU:
- DS194147
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- BUSHING
- RIDING STYLE:
- STREET
- TYPE:
- CAM COVER
- UNITS:
- EACH
$37.95 -
EASTERN MOTORCYCLE PARTS Plastic Breather Valve Washer Set - Big Twin A-25319-SET
EASTERN MOTORCYCLE PARTS
$33.95Proper breather valve maintenance is critical for reliable Big Twin engine performance, and using the correct washer material ensures a consistent seal without degradation. This Eastern Motorcycle Parts washer set is engineered specifically for plastic...DS194160- SKU:
- DS194160
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- SIZE IMPERIAL:
- 0.140'
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- SIZE IMPERIAL:
- 0.130'
- SIZE IMPERIAL:
- 0.135'
- SIZE IMPERIAL:
- 0.155'
- SIZE IMPERIAL:
- 0.165'
- UNITS:
- 8 PACK
- MATERIAL:
- PLASTIC
- SIZE IMPERIAL:
- 0.145'
- SIZE IMPERIAL:
- 0.150'
- SIZE IMPERIAL:
- 0.160'
- TYPE:
- BREATHER VALVE
$33.95 -
EASTERN MOTORCYCLE PARTS Cam Gear Shims - Big Twin A-25550-SET
EASTERN MOTORCYCLE PARTS
$39.95Precise cam timing is the foundation of reliable engine performance, and worn or incorrectly shimmed cam gears introduce unwanted variability into your ignition and valve overlap. EASTERN MOTORCYCLE PARTS Cam Gear Shims deliver the exact adjustments your...DS194162- SKU:
- DS194162
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- SHIM
- SIZE IMPERIAL:
- 0.050' - 0.095'
- TYPE:
- CAM
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
$39.95 -
EASTERN MOTORCYCLE PARTS Cam Gear Shims - Big Twin A-25550-36
EASTERN MOTORCYCLE PARTS
$13.50Precise cam timing is critical to engine performance, and worn or improperly shimmed cam gears can compromise both power delivery and reliability. These EASTERN MOTORCYCLE PARTS cam gear shims deliver the exact clearance tolerances your Big Twin demands,...DS194163- SKU:
- DS194163
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- PRODUCT NAME:
- SHIM
- TYPE:
- CAM
- SIZE IMPERIAL:
- 0.050'
$13.50 -
EASTERN MOTORCYCLE PARTS Cam Gear Shims - Big Twin A-25551-36
EASTERN MOTORCYCLE PARTS
$14.80Proper valve timing is critical to maximizing your Big Twin's horsepower and torque delivery, and worn cam gear shims are a common culprit behind performance loss and reliability issues. These EASTERN MOTORCYCLE PARTS shims restore precise clearances and...DS194164- SKU:
- DS194164
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- SIZE IMPERIAL:
- 0.055'
- TYPE:
- CAM
- PRODUCT NAME:
- SHIM
$14.80 -
EASTERN MOTORCYCLE PARTS Cam Gear Shims - Big Twin A-25552-36
EASTERN MOTORCYCLE PARTS
$14.80Precise cam timing is critical to maximizing your Big Twin's performance, and worn or improperly shimmed cam gears will rob you of power and introduce unwanted mechanical noise. These EASTERN MOTORCYCLE PARTS cam gear shims allow you to dial in exact...DS194165- SKU:
- DS194165
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- PRODUCT NAME:
- SHIM
- TYPE:
- CAM
- SIZE IMPERIAL:
- 0.060'
$14.80 -
EASTERN MOTORCYCLE PARTS Cam Gear Shims - Big Twin A-25553-36
EASTERN MOTORCYCLE PARTS
$14.80Precise cam timing is critical to maximizing horsepower and maintaining valve train reliability on your Big Twin engine. These OEM-spec shims allow you to fine-tune cam gear clearance during assembly or top-end rebuilds, ensuring optimal valve overlap...DS194166- SKU:
- DS194166
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- SIZE IMPERIAL:
- 0.065'
- PRODUCT NAME:
- SHIM
- TYPE:
- CAM
$14.80 -
EASTERN MOTORCYCLE PARTS Cam Gear Shims - Big Twin A-25554-36
EASTERN MOTORCYCLE PARTS
$14.80Precise cam timing is non-negotiable in high-performance Big Twin engines, and worn or misaligned cam gears directly compromise valve overlap and peak power delivery. EASTERN MOTORCYCLE PARTS Cam Gear Shims allow you to dial in exact timing adjustments...DS194167- SKU:
- DS194167
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- PRODUCT NAME:
- SHIM
- SIZE IMPERIAL:
- 0.070'
- TYPE:
- CAM
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$14.80 -
EASTERN MOTORCYCLE PARTS Cam Gear Shims - Big Twin A-25555-36
EASTERN MOTORCYCLE PARTS
$14.80Proper valve timing is critical to unlocking your Big Twin's full potential, and worn or misaligned cam gears rob you of horsepower and throttle response. EASTERN MOTORCYCLE PARTS Cam Gear Shims give you the precision adjustment needed to dial in exact...DS194168- SKU:
- DS194168
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- SIZE IMPERIAL:
- 0.075'
- TYPE:
- CAM
$14.80 -
EASTERN MOTORCYCLE PARTS Cam Cover Bushing - XL A-25586-37
EASTERN MOTORCYCLE PARTS
$37.95A worn or damaged cam cover bushing compromises engine sealing and can lead to oil leaks and contamination of critical engine components. This OEM-specification replacement bushing restores proper fit and function, ensuring your engine maintains clean...DS194171- SKU:
- DS194171
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- FEATURES:
- #1, 3, 4
- UNITS:
- EACH
- PRODUCT NAME:
- BUSHING
- RIDING STYLE:
- STREET
- TYPE:
- SUPPORT PLATE
$37.95 -
EASTERN MOTORCYCLE PARTS Cam Bushing Kit - Big Twin 15-0117
EASTERN MOTORCYCLE PARTS
$117.95Worn cam bushings compromise valve timing precision and accelerate camshaft wear—directly impacting engine reliability and performance. This OEM-quality replacement kit restores proper bushing clearances, ensuring consistent valve actuation and extending...DS194172- SKU:
- DS194172
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- PRODUCT NAME:
- BUSHING KIT
- TYPE:
- CAM
- UNITS:
- KIT
- RIDING STYLE:
- STREET
$117.95 -
EASTERN MOTORCYCLE PARTS Engine Sprocket Nut A-24003-55
EASTERN MOTORCYCLE PARTS
$12.95If you're converting to a belt-drive system or streamlining your engine's drivetrain by eliminating compensating sprockets, you need a sprocket nut that delivers absolute reliability under load. The EASTERN MOTORCYCLE PARTS Engine Sprocket Nut A-24003-55...DS194074- SKU:
- DS194074
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- MOTOR SPROCKET
- PRODUCT NAME:
- NUT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$12.95
