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 Tappet Adjusting Screws - Big Twin A-18555-36
EASTERN MOTORCYCLE PARTS
$25.60Proper valve clearance is non-negotiable for Big Twin performance and longevity. These OEM-quality tappet adjusting screws ensure precise valve lash settings, preventing costly compression loss, valve float, and catastrophic engine damage. When your...DS193141- SKU:
- DS193141
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- UNITS:
- 4 PACK
- TYPE:
- TAPPET
- PRODUCT NAME:
- ADJUSTING SCREW
- RIDING STYLE:
- STREET
$25.60 -
EASTERN MOTORCYCLE PARTS Tappet Adjusting Screw Lock Nuts - Big Twin A-18570-38
EASTERN MOTORCYCLE PARTS
$24.20Proper valve clearance is fundamental to Big Twin engine longevity and performance, and these Eastern Motorcycle Parts tappet adjusting screw lock nuts are engineered to keep your settings locked in place where they belong. Manufactured to exacting...DS193143- SKU:
- DS193143
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- MATERIAL:
- STEEL
- TYPE:
- TAPPET
- PRODUCT NAME:
- LOCK NUT
- RIDING STYLE:
- STREET
- TYPE:
- ADJUSTING SCREW
- UNITS:
- 10 PACK
$24.20 -
EASTERN MOTORCYCLE PARTS Cam Lock Washers A-25550-57
EASTERN MOTORCYCLE PARTS
$17.50Cam lock washers provide the secure fastening your high-performance build demands, preventing vibration-induced loosening that can compromise engine reliability and safety. Whether you're assembling a race engine or maintaining critical drivetrain...DS193144- SKU:
- DS193144
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- TYPE:
- CAM LOCK
- UNITS:
- 5 PACK
$17.50 -
EASTERN MOTORCYCLE PARTS Shift Roller Fingers A-34168-52
EASTERN MOTORCYCLE PARTS
$16.10Shift roller fingers are a critical wear component in your transmission's shift mechanism—when they degrade, you'll experience sluggish shifts, missed gears, and potential transmission damage. The Eastern Motorcycle Parts A-34168-52 delivers...DS193145- SKU:
- DS193145
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MATERIAL:
- STEEL
- UNITS:
- 10 PACK
- PRODUCT NAME:
- ROLLER FINGER
- RIDING STYLE:
- STREET
- TYPE:
- SHIFTER
$16.10 -
EASTERN MOTORCYCLE PARTS Shift Roller Fingers A-34168-39
EASTERN MOTORCYCLE PARTS
$16.10Smooth, reliable gear transitions are essential for maintaining momentum and control during aggressive riding. The EASTERN MOTORCYCLE PARTS Shift Roller Fingers A-34168-39 deliver the precision engagement your transmission requires, reducing shift lag...DS193146- SKU:
- DS193146
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- 10 PACK
- PRODUCT NAME:
- ROLLER FINGER
- RIDING STYLE:
- STREET
- TYPE:
- SHIFTER
- MATERIAL:
- STEEL
$16.10 -
EASTERN MOTORCYCLE PARTS Mainshaft Nylon Nut A-35078-79
EASTERN MOTORCYCLE PARTS
$9.40A secure mainshaft connection is critical to reliable engine performance, and a worn or damaged nylon nut compromises the entire assembly's integrity. This OEM-spec mainshaft nut ensures precise fitment and dependable clamping force, eliminating the risk...DS193148- SKU:
- DS193148
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- NUT
- TYPE:
- NYLOCK
- RIDING STYLE:
- STREET
- TYPE:
- MAINSHAFT
- UNITS:
- 5 PACK
$9.40 -
EASTERN MOTORCYCLE PARTS Mainshaft Spacers A-35076-79
EASTERN MOTORCYCLE PARTS
$4.00Mainshaft spacers are critical for maintaining proper gear engagement and reducing unwanted play in your transmission assembly. A correctly sized spacer ensures consistent shifting performance and protects against premature wear on your drivetrain...DS193149- SKU:
- DS193149
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- SPACER
- RIDING STYLE:
- STREET
- TYPE:
- MAINSHAFT
- UNITS:
- 10 PACK
$4.00 -
EASTERN MOTORCYCLE PARTS Mainshaft Bushings A-37436-36
EASTERN MOTORCYCLE PARTS
$8.10Mainshaft bushings are critical wear items that directly impact transmission smoothness and longevity. Over time, stock bushings develop play and slop, leading to notchy shifting, increased noise, and accelerated gear wear. EASTERN MOTORCYCLE PARTS...DS193152- SKU:
- DS193152
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- BUSHING
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- TYPE:
- MAINSHAFT
$8.10 -
EASTERN MOTORCYCLE PARTS Countershaft Nut A-7911
EASTERN MOTORCYCLE PARTS
$9.40A properly secured countershaft is fundamental to reliable engine operation and consistent power delivery. The Eastern Motorcycle Parts Countershaft Nut A-7911 is engineered to maintain critical fastening integrity under the sustained vibration and...DS193153- SKU:
- DS193153
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- NUT
- TYPE:
- COUNTERSHAFT
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$9.40 -
EASTERN MOTORCYCLE PARTS Countershaft End Plate A-35630-36
EASTERN MOTORCYCLE PARTS
$9.40The countershaft end plate is a critical load-bearing component that prevents axial movement and ensures precise gear alignment in your transmission assembly. A worn or damaged end plate compromises shift quality, increases noise, and accelerates...DS193154- SKU:
- DS193154
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- TYPE:
- COUNTERSHAFT
- PRODUCT NAME:
- END PLATE
$9.40 -
EASTERN MOTORCYCLE PARTS Puller Spacer A-33334-85
EASTERN MOTORCYCLE PARTS
$37.95Precision engine work demands reliable tooling, and the Eastern Motorcycle Parts Puller Spacer A-33334-85 is engineered to deliver exact positioning during critical assembly and disassembly tasks. This domestically manufactured spacer eliminates...DS193155- SKU:
- DS193155
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- PULLEY
- PRODUCT NAME:
- SPACER
$37.95 -
EASTERN MOTORCYCLE PARTS Clutch Hub Nut - Big Twin A-37496-90
EASTERN MOTORCYCLE PARTS
$24.95A properly functioning clutch hub nut is critical to maintaining reliable power transfer and preventing costly drivetrain damage on Big Twin engines. This Eastern Motorcycle Parts fastener delivers the precision fit and durability your transmission...DS193156- SKU:
- DS193156
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- NUT
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- TYPE:
- CLUTCH HUB
$24.95 -
EASTERN MOTORCYCLE PARTS Clutch Hub Nut A-37496-84
EASTERN MOTORCYCLE PARTS
$20.95A properly torqued clutch hub nut is critical to maintaining clutch integrity and preventing catastrophic drivetrain failure during aggressive riding or racing. This Eastern Motorcycle Parts OEM-quality fastener ensures a secure connection between your...DS193157- SKU:
- DS193157
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH HUB
- UNITS:
- EACH
- MATERIAL:
- STEEL
- PRODUCT NAME:
- NUT
$20.95 -
EASTERN MOTORCYCLE PARTS Clutch Hub Nut A-37496-41
EASTERN MOTORCYCLE PARTS
$24.95A worn or damaged clutch hub nut compromises your entire clutch assembly, leading to slippage, noise, and potential catastrophic failure on the track or road. The Eastern Motorcycle Parts Clutch Hub Nut A-37496-41 delivers the precision fit and...DS193158- SKU:
- DS193158
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- TYPE:
- CLUTCH HUB
- MATERIAL:
- STEEL
- PRODUCT NAME:
- NUT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$24.95 -
EASTERN MOTORCYCLE PARTS Pushrod Adjusting Screws A-37357-41
EASTERN MOTORCYCLE PARTS
$26.90Proper valve train geometry is critical to maintaining peak engine performance and longevity. These pushrod adjusting screws ensure precise rocker arm geometry and hydraulic lifter preload, directly impacting valvetrain efficiency and reducing wear on...DS193159- SKU:
- DS193159
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- TYPE:
- CLUTCH
- TYPE:
- PUSHROD
- PRODUCT NAME:
- ADJUSTING SCREW
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
$26.90 -
EASTERN MOTORCYCLE PARTS Clutch Hub Nut A-37581-47
EASTERN MOTORCYCLE PARTS
$8.00A properly secured clutch hub is critical to reliable power transmission and safe operation. This Eastern Motorcycle Parts clutch hub nut ensures precision fitment and secure engagement on compatible applications, eliminating the risk of slippage or...DS193160- SKU:
- DS193160
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- NUT
- RIDING STYLE:
- STREET
- TYPE:
- STUD
- UNITS:
- 3 PACK
$8.00 -
EASTERN MOTORCYCLE PARTS Clutch Adjusting Screw Lock Nuts A-37361-41
EASTERN MOTORCYCLE PARTS
$10.70Clutch adjustment is only as reliable as the fasteners holding it in place. These lock nuts prevent vibration-induced loosening that can throw off your clutch engagement point mid-ride, compromising both performance and safety. Trust U.S.-manufactured...DS193161- SKU:
- DS193161
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- PRODUCT NAME:
- ADJUSTING SCREW
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH
- UNITS:
- 5 PACK
$10.70 -
EASTERN MOTORCYCLE PARTS Right Pushrod End A-37069-90
EASTERN MOTORCYCLE PARTS
$27.95The Eastern Motorcycle Parts Right Pushrod End A-37069-90 is a precision-engineered component designed to deliver reliable valve train actuation in demanding riding conditions. Whether you're rebuilding a classic cruiser or maintaining a high-revving...DS192520- SKU:
- DS192520
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- MOUNTING POSITION:
- RIGHT
- PRODUCT NAME:
- PUSHROD END
- TYPE:
- CLUTCH
- DIAMETER IMPERIAL:
- 2.125'
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$27.95 -
EASTERN MOTORCYCLE PARTS Pushrod End - Right A-37089-79
EASTERN MOTORCYCLE PARTS
$14.95Precision pushrods are the unsung critical link between your motorcycle's camshaft and valve train—any wear or misalignment directly impacts valve timing, combustion efficiency, and engine reliability. The EASTERN MOTORCYCLE PARTS Pushrod End (Right)...DS192521- SKU:
- DS192521
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- CLUTCH
- DIAMETER IMPERIAL:
- 1.8750'
- RIDING STYLE:
- STREET
- MOUNTING POSITION:
- RIGHT
- PRODUCT NAME:
- PUSHROD END
- UNITS:
- EACH
$14.95 -
EASTERN MOTORCYCLE PARTS Crank Case Oil Screen A-24983-00
EASTERN MOTORCYCLE PARTS
$20.00A clogged or failing crankcase oil screen compromises lubrication flow and can lead to catastrophic engine damage. This Eastern Motorcycle Parts OEM-quality screen ensures consistent oil delivery to critical engine components, maintaining proper pressure...09500224- SKU:
- 09500224
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SCREEN
- RIDING STYLE:
- STREET
- TYPE:
- OIL
- UNITS:
- 5 PACK
$20.00
