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
-
On Sale
EASTERN MOTORCYCLE PARTS Retainer with Bearings A-24650-58
EASTERN MOTORCYCLE PARTS
MSRP: $53.95Now: $49.09Was: $53.95A quality bearing retainer assembly is critical to maintaining smooth, reliable operation in high-stress drivetrain environments. This complete bearing assembly from Eastern Motorcycle Parts ensures...09500345- SKU:
- 09500345
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- BEARING
- TYPE:
- ROLLER
- SIZE IMPERIAL:
- STANDARD
- APPLICATION:
- CRANKCASE
- RIDING STYLE:
- STREET
- SIZE:
- STANDARD
- UNITS:
- SET
MSRP: $53.95Now: $49.09Was: $53.95 -
On Sale
EASTERN MOTORCYCLE PARTS Balance Shaft Spacer Kit 40-0145
EASTERN MOTORCYCLE PARTS
MSRP: $31.95Now: $29.07Was: $31.95Proper balance shaft alignment is critical for minimizing vibration, extending engine life, and maintaining optimal performance across your entire drivetrain. This spacer kit gives you precision...09500356- SKU:
- 09500356
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SPACER KIT
- TYPE:
- BALANCE SHAFT
- UNITS:
- KIT
MSRP: $31.95Now: $29.07Was: $31.95Qty in Cart: 0Quantity:Price:MSRP: $31.95Now: $29.07Was: $31.95Subtotal: -
On Sale
EASTERN MOTORCYCLE PARTS Sprocket Shaft Spacer A-24029-55
EASTERN MOTORCYCLE PARTS
Now: $34.40Was: $37.80Precision sprocket alignment is critical to drivetrain efficiency and chain longevity. A worn or misaligned sprocket shaft spacer introduces runout that accelerates chain wear, increases noise, and...09500359- SKU:
- 09500359
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- SPROCKET
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- PRODUCT NAME:
- SPACER
Now: $34.40Was: $37.80 -
On Sale
EASTERN MOTORCYCLE PARTS Rocker Arm Shaft Springs A-17483-57
EASTERN MOTORCYCLE PARTS
Now: $8.55Was: $9.40Rocker arm shaft springs are critical to maintaining proper valve train geometry and preventing unwanted lift during high-RPM operation. A worn or compromised spring directly impacts valve timing...09270012- SKU:
- 09270012
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- SPRING
- TYPE:
- ROCKER ARM SHAFT
- RIDING STYLE:
- STREET
- UNITS:
- 10 PACK
Now: $8.55Was: $9.40 -
On Sale
EASTERN MOTORCYCLE PARTS Rocker Arm Lock Nut A-7727
EASTERN MOTORCYCLE PARTS
Now: $12.29Was: $13.50Proper rocker arm retention is critical to maintaining valve train integrity and preventing catastrophic engine failure during high-RPM operation. This Eastern Motorcycle Parts lock nut delivers the...09270020- SKU:
- 09270020
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- RIDING STYLE:
- STREET
- TYPE:
- LOCK
- PRODUCT NAME:
- NUT
- TYPE:
- ROCKER ARM
- UNITS:
- 10 PACK
Now: $12.29Was: $13.50 -
On Sale
EASTERN MOTORCYCLE PARTS Rod Bearings - +.002" B-74-7-RS
EASTERN MOTORCYCLE PARTS
MSRP: $20.95Now: $19.06Was: $20.95Precision rod bearings are the foundation of reliable engine performance—tolerances measured in thousandths of an inch directly impact horsepower delivery, durability, and longevity. The Eastern...09240178- SKU:
- 09240178
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- RIDING STYLE:
- STREET
- OUTSIDE DIAMETER IMPERIAL:
- OVERSIZE (+0.002')
- TYPE:
- ROLLER
- UNITS:
- SET
- APPLICATION:
- CONNECTING ROD
- PRODUCT NAME:
- BEARING
MSRP: $20.95Now: $19.06Was: $20.95 -
On Sale
EASTERN MOTORCYCLE PARTS Rod Bearings - Standard - Big Twin B-LATE-1-RS
EASTERN MOTORCYCLE PARTS
MSRP: $18.95Now: $17.24Was: $18.95Rod bearings are the critical interface between your crankshaft and connecting rods—they absorb shock loads, manage friction, and determine whether your engine lives or fails catastrophically...09240193- SKU:
- 09240193
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
- APPLICATION:
- CONNECTING ROD
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- STREET
- TYPE:
- ROLLER
- OUTSIDE DIAMETER IMPERIAL:
- STANDARD
- UNITS:
- SET
MSRP: $18.95Now: $17.24Was: $18.95 -
On Sale
EASTERN MOTORCYCLE PARTS Tappet Adjusting Screws - XL A-18554-57
EASTERN MOTORCYCLE PARTS
Now: $23.30Was: $25.60Proper valve clearance is essential for optimal engine performance, fuel efficiency, and longevity. These tappet adjusting screws ensure precise valve train geometry, preventing the performance loss...DS193142- SKU:
- DS193142
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- PRODUCT NAME:
- ADJUSTING SCREW
- RIDING STYLE:
- STREET
- UNITS:
- 4 PACK
- TYPE:
- TAPPET
Now: $23.30Was: $25.60 -
On Sale
EASTERN MOTORCYCLE PARTS Shifter Finger - Big Twin A-34165-36
EASTERN MOTORCYCLE PARTS
MSRP: $26.95Now: $24.52Was: $26.95A quality shifter finger is critical to reliable gear engagement and precise shift feel in Big Twin applications. The Eastern Motorcycle Parts A-34165-36 delivers consistent, positive actuation...DS193147- SKU:
- DS193147
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PRODUCT NAME:
- SHIFTER FINGER
- UNITS:
- EACH
- RIDING STYLE:
- STREET
MSRP: $26.95Now: $24.52Was: $26.95 -
On Sale
EASTERN MOTORCYCLE PARTS Main Bearing Retention Ring A-35114-02
EASTERN MOTORCYCLE PARTS
Now: $8.55Was: $9.40A failing main bearing retention ring compromises crankshaft stability and can lead to catastrophic engine failure. This OE-specification replacement ring ensures proper bearing preload and...09500222- SKU:
- 09500222
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- STEEL
- TYPE:
- MAINSHAFT
- UNITS:
- 10 PACK
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- RETAINING RING
Now: $8.55Was: $9.40 -
On Sale
EASTERN MOTORCYCLE PARTS Main Bearing Retention Ring A-35115-99
EASTERN MOTORCYCLE PARTS
Now: $8.46Was: $9.30A worn or failing main bearing retention ring can compromise crankshaft stability and accelerate bearing wear across your entire engine. This OE-specification Eastern Motorcycle Parts ring restores...09500223- SKU:
- 09500223
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- PRODUCT NAME:
- RETAINING RING
- TYPE:
- MAINSHAFT
- UNITS:
- 10 PACK
Now: $8.46Was: $9.30Qty in Cart: 0Quantity:Price:Now: $8.46Was: $9.30Subtotal: -
Hastings HASTINGS Piston Rings - 1200 2M6482040
HASTINGS
$85.02Piston rings are a critical wear item that directly impacts compression, oil control, and engine longevity. The Hastings 2M6482040 ring set delivers precision bore sealing and consistent blowby...DS750824- SKU:
- DS750824
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- PISTON RING
- RING MATERIAL:
- MOLY COATED
- STYLE:
- PERFORMANCE REPLACEMENT
- BORE - OVERSIZE:
- +0,040'
- BORE OVERSIZE - IMPERIAL:
- +0.040'
- UNITS:
- SET
- BORE SIZE IMPERIAL:
- 3.477'
- RIDING STYLE:
- STREET
$85.02 -
Hastings HASTINGS Piston Rings - 1200 2M6482030
HASTINGS
$85.02Piston rings are critical to engine sealing, compression, and oil control—worn or improper rings lead to blow-by, loss of power, and accelerated engine wear. The Hastings 2M6482030 ring set delivers...DS750823- SKU:
- DS750823
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- RING MATERIAL:
- MOLY COATED
- RIDING STYLE:
- STREET
- BORE - OVERSIZE:
- +0,030'
- BORE OVERSIZE - IMPERIAL:
- +0.030'
- BORE SIZE IMPERIAL:
- 3.467'
- PRODUCT NAME:
- PISTON RING
- STYLE:
- PERFORMANCE REPLACEMENT
- UNITS:
- SET
$85.02 -
Hastings HASTINGS Piston Rings - XL 2M7003020
HASTINGS
$89.95Hastings piston rings deliver the precision fit and durability that high-performance engines demand. Engineered specifically for KB pistons, these rings reduce blow-by, extend component life, and...DS750812- SKU:
- DS750812
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RING MATERIAL:
- MOLY COATED
- BORE - OVERSIZE:
- +0,020'
- RIDING STYLE:
- STREET
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- BORE SIZE IMPERIAL:
- 3.1875'
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$89.95Qty in Cart: 0Quantity:Price:$89.95Subtotal: -
DRAG SPECIALTIES Piston - XL 750767-BX-LB1
DRAG SPECIALTIES
$132.45If you're rebuilding your engine or replacing a worn piston, OEM-quality performance matters. This DRAG SPECIALTIES piston delivers cast aluminum durability with a friction-reducing coating that...DS750767- SKU:
- DS750767
- Availability:
- Ships Same Business Day
- Weight:
- 3.06 LBS
- BORE SIZE IMPERIAL:
- 3.498'
- PISTON DIAMETER IMPERIAL:
- 3.498'
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 3-13/16'
- BORE - OVERSIZE:
- +0,005'
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- PRODUCT NAME:
- PISTON
- UNITS:
- KIT
$132.45 -
DRAG SPECIALTIES Piston - XL 750766-BX-LB1
DRAG SPECIALTIES
$132.45Your engine's pistons are the hardworking core of combustion—when they wear, power drops and efficiency suffers. The DRAG SPECIALTIES XL 750766-BX-LB1 delivers OEM-quality reliability at a price that...DS750766- SKU:
- DS750766
- Availability:
- Ships Same Business Day
- Weight:
- 2.94 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- BORE SIZE IMPERIAL:
- 3.498'
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 3-13/16'
- PISTON DIAMETER IMPERIAL:
- 3.498'
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- UNITS:
- KIT
$132.45 -
DRAG SPECIALTIES Piston - XL 750755-BX-LB1
DRAG SPECIALTIES
$108.07If you're running your XL 750755-BX-LB1 at the limit, worn pistons are a direct hit to power output and engine longevity. This DRAG SPECIALTIES piston kit delivers OEM-quality construction with a...DS750755- SKU:
- DS750755
- Availability:
- Ships Same Business Day
- Weight:
- 2.38 LBS
- BORE SIZE IMPERIAL:
- 3.237'
- PRODUCT NAME:
- PISTON
- PISTON MATERIAL:
- ALUMINUM
- PISTON DIAMETER IMPERIAL:
- 3.237'
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 3-13/16'
- UNITS:
- PAIR
- BORE - OVERSIZE:
- +0,050'
- BORE OVERSIZE - IMPERIAL:
- +0.050'
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
$108.07 -
DRAG SPECIALTIES Rod Bearing Retainers - XL 26526-HC3
DRAG SPECIALTIES
$31.88Rod bearing retainers are critical to maintaining proper bearing clearance and preventing catastrophic engine failure—especially in high-RPM applications where tolerances are unforgiving. DRAG...DS194017- SKU:
- DS194017
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- ROD BEARING
- UNITS:
- 3 PACK
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- RETAINER
- RIDING STYLE:
- STREET
$31.88Qty in Cart: 0Quantity:Price:$31.88Subtotal: -
GARDNER-WESTCOTT Rocker Box Bolt Kit - 80" C-80-115Y
GARDNER-WESTCOTT
$56.95Installing rocker boxes requires precision fastening—using an incomplete or mismatched bolt kit compromises valve train integrity and can lead to catastrophic engine failure. The GARDNER-WESTCOTT...DS190307- SKU:
- DS190307
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- MOUNTING KIT
- TYPE:
- ROCKER BOX
$56.95 -
GARDNER-WESTCOTT Stainless Steel Switch House SP-74-150B
GARDNER-WESTCOTT
$20.95If you're building or restoring a Harley-Davidson engine, quality switch house covers are non-negotiable—they protect critical internal components while maintaining a clean, professional appearance...DS189390- SKU:
- DS189390
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BASE FINISH:
- NATURAL
- BASE FINISH:
- POLISHED
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- BOLT KIT
- TYPE:
- HANDLE BAR LEVER
- TYPE:
- SWITCH BOX
- UNITS:
- KIT
- COLOR/FINISH:
- NATURAL
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- STREET
- BASE COLOR:
- SILVER
- COLOR/FINISH:
- POLISHED
- STYLE:
- SOCKET-HEAD
$20.95Qty in Cart: 0Quantity:Price:$20.95Subtotal:
