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
S&S CYCLE Pinion Shaft - Big Twin 33-2024
S&S CYCLE
MSRP: $199.95Now: $179.96Was: $199.95The S&S Cycle Pinion Shaft is engineered for Big Twin engines that demand reliable, precision-machined drivetrain components. A quality pinion shaft ensures smooth power delivery and longevity under...09210167- SKU:
- 09210167
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- MATERIAL:
- STEEL
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- PINION SHAFT ASSEMBLY
MSRP: $199.95Now: $179.96Was: $199.95 -
On Sale
S&S CYCLE Pinion Shaft - Big Twin 33-2027
S&S CYCLE
MSRP: $183.95Now: $165.56Was: $183.95The S&S Cycle Pinion Shaft is a critical drivetrain component for Big Twin engines, engineered to handle the increased torque loads of performance builds. Whether you're upgrading your primary drive...09210168- SKU:
- 09210168
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- UNITS:
- EACH
- MATERIAL:
- STEEL
- PRODUCT NAME:
- PINION SHAFT ASSEMBLY
- RIDING STYLE:
- STREET
MSRP: $183.95Now: $165.56Was: $183.95 -
On Sale
S&S CYCLE Flywheel - Stroker - Twin Cam 320-0361
S&S CYCLE
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95If you're building a high-output stroker engine, your factory flywheel won't cut it. The S&S CYCLE Stroker Flywheel is engineered to handle the increased loads and rotational forces of a larger...09210524- SKU:
- 09210524
- Availability:
- Ships Same Business Day
- Weight:
- 39.40 LBS
- STROKE LENGTH IMPERIAL:
- 4-3/8'
- ENGINE TYPE:
- 'A' MOTOR
- FEATURES:
- WITHOUT SPROCKET BEARING RACE
- PRODUCT NAME:
- FLYWHEEL ASSEMBLY
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- UNITS:
- EACH
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95 -
On Sale
S&S CYCLE Motor Sprocket Shaft Assembly '36-'51 Big Twin 33-2001
S&S CYCLE
MSRP: $183.95Now: $165.56Was: $183.95The S&S Cycle Motor Sprocket Shaft Assembly is the foundation of reliable primary drive engagement on your Big Twin. A worn or damaged sprocket shaft compromises both power delivery and bearing...09210556- SKU:
- 09210556
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- PRODUCT NAME:
- SPROCKET SHAFT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
MSRP: $183.95Now: $165.56Was: $183.95 -
On Sale
S&S CYCLE Flywheel - Stroker - Twin Cam 320-0396
S&S CYCLE
MSRP: $1,794.95Now: $1,615.46Was: $1,794.95If you're pushing your Twin Cam beyond stock limits, a quality flywheel is non-negotiable. The S&S Cycle Stroker Flywheel handles the increased rotational demands of a stroker build while maintaining...09220120- SKU:
- 09220120
- Availability:
- Ships Same Business Day
- Weight:
- 38.73 LBS
- FEATURES:
- WITH SPROCKET BEARING RACE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- FLYWHEEL ASSEMBLY
- UNITS:
- EACH
- ENGINE TYPE:
- 'B' MOTOR
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4'
MSRP: $1,794.95Now: $1,615.46Was: $1,794.95 -
On Sale
S&S CYCLE Flywheel - Stroker - Twin Cam 320-0352
S&S CYCLE
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95If you're building a high-displacement stroker engine, your stock flywheel won't cut it. The S&S CYCLE Stroker Flywheel is engineered to handle the increased rotational loads and stress that come...09220121- SKU:
- 09220121
- Availability:
- Ships Same Business Day
- Weight:
- 38.73 LBS
- PRODUCT NAME:
- FLYWHEEL ASSEMBLY
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4-3/8'
- ENGINE TYPE:
- 'A' MOTOR
- FEATURES:
- WITH SPROCKET BEARING RACE
- MATERIAL:
- STEEL
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95 -
On Sale
S&S CYCLE Flywheel - Stroker - Twin Cam 320-0358
S&S CYCLE
MSRP: $1,795.95Now: $1,616.36Was: $1,795.95If you're pushing your Twin Cam engine toward higher displacement and increased power output, the stock flywheel becomes your limiting factor. The S&S CYCLE Stroker Flywheel is engineered to handle...09220122- SKU:
- 09220122
- Availability:
- Ships Same Business Day
- Weight:
- 39.44 LBS
- PRODUCT NAME:
- FLYWHEEL ASSEMBLY
- UNITS:
- EACH
- FEATURES:
- WITH SPROCKET BEARING RACE
- MATERIAL:
- STEEL
- STROKE LENGTH IMPERIAL:
- 4-3/8'
- ENGINE TYPE:
- 'B' MOTOR
- RIDING STYLE:
- STREET
MSRP: $1,795.95Now: $1,616.36Was: $1,795.95 -
On Sale
S&S CYCLE Flywheel - Stroker - Twin Cam 320-0351
S&S CYCLE
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95If you're building a high-displacement or high-RPM engine, stock flywheels are a liability. The S&S Cycle Stroker Flywheel is engineered to handle the increased loads and stresses of a stroker setup,...09220123- SKU:
- 09220123
- Availability:
- Ships Same Business Day
- Weight:
- 39.20 LBS
- MATERIAL:
- STEEL
- FEATURES:
- WITHOUT SPROCKET BEARING RACE
- PRODUCT NAME:
- FLYWHEEL ASSEMBLY
- UNITS:
- EACH
- ENGINE TYPE:
- 'A' MOTOR
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4-3/8'
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95 -
On Sale
S&S CYCLE Piston Kit 92-2046
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95If you're running a Harley Big Twin and want genuine displacement gains without an engine swap, the S&S CYCLE 1250cc Piston Kit delivers the capacity increase your machine needs. Moving from 883cc or...09100295- SKU:
- 09100295
- Availability:
- Ships Same Business Day
- Weight:
- 2.70 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 89'
- TYPE:
- REPLACEMENT
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4-5/8'
- BORE SIZE IMPERIAL:
- 3.500'
- PISTON HEAD SHAPE:
- DOMED
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
MSRP: $484.95Now: $436.46Was: $484.95 -
On Sale
S&S CYCLE Piston Kit 92-2047
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95If you're running an 883cc or 1200cc Big Twin and want real power gains without a complete engine rebuild, the S&S CYCLE Piston Kit 92-2047 delivers a straightforward path to 1250cc displacement and...09100297- SKU:
- 09100297
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- BORE - OVERSIZE:
- +0,010'
- PISTON HEAD SHAPE:
- DOMED
- TYPE:
- REPLACEMENT
- DISPLACEMENT:
- 89'
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- STREET
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH IMPERIAL:
- 4-5/8'
- UNITS:
- KIT
MSRP: $484.95Now: $436.46Was: $484.95Qty in Cart: 0Quantity:Price:MSRP: $484.95Now: $436.46Was: $484.95Subtotal: -
On Sale
S&S CYCLE Piston Kit 106-5495
S&S CYCLE
MSRP: $469.95Now: $422.96Was: $469.95A piston kit is foundational to reliable high-RPM performance and longevity. The S&S Cycle 106-5495 delivers forged construction that resists detonation and thermal stress, while modern alloy...09101918- SKU:
- 09101918
- Availability:
- Ships Same Business Day
- Weight:
- 2.89 LBS
- BORE SIZE IMPERIAL:
- 3.4375'
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH IMPERIAL:
- 3-31/32'
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 8.0:1
- DISPLACEMENT:
- 74'
- TYPE:
- LOW COMPRESSION
- RIDING STYLE:
- STREET
MSRP: $469.95Now: $422.96Was: $469.95 -
On Sale
S&S CYCLE Piston Kit 106-5511
S&S CYCLE
MSRP: $410.95Now: $369.86Was: $410.95If you're building or rebuilding a high-displacement engine, piston quality directly impacts reliability, ring seal, and how your engine responds under sustained load. The S&S Cycle 106-5511 delivers...09101923- SKU:
- 09101923
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 8.0:1
- TYPE:
- LOW COMPRESSION
- DISPLACEMENT:
- 80'
- STROKE LENGTH IMPERIAL:
- 4-1/4'
MSRP: $410.95Now: $369.86Was: $410.95Qty in Cart: 0Quantity:Price:MSRP: $410.95Now: $369.86Was: $410.95Subtotal: -
On Sale
S&S CYCLE Piston Kit 106-5512
S&S CYCLE
MSRP: $410.95Now: $369.86Was: $410.95A quality piston kit is the foundation of reliable engine performance, and the S&S Cycle 106-5512 delivers the strength and precision you need for high-demand applications. These forged pistons are...09101924- SKU:
- 09101924
- Availability:
- Ships Same Business Day
- Weight:
- 2.80 LBS
- BORE - OVERSIZE:
- +0,010'
- BORE SIZE IMPERIAL:
- 3.510'
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- UNITS:
- KIT
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- DISPLACEMENT:
- 80'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- TYPE:
- LOW COMPRESSION
- COMPRESSION RATIO IMPERIAL:
- 8.0:1
- PISTON MATERIAL:
- FORGED
MSRP: $410.95Now: $369.86Was: $410.95Qty in Cart: 0Quantity:Price:MSRP: $410.95Now: $369.86Was: $410.95Subtotal: -
On Sale
S&S CYCLE Piston Kit 106-5513
S&S CYCLE
MSRP: $410.95Now: $369.86Was: $410.95Upgrading to forged pistons is essential if you're pushing your engine beyond stock limits—factory pistons simply can't handle the sustained stress of high RPM and boost conditions. The S&S CYCLE...09101925- SKU:
- 09101925
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- BORE - OVERSIZE:
- +0,020'
- DISPLACEMENT:
- 80'
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.520'
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- COMPRESSION RATIO IMPERIAL:
- 8.0:1
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- TYPE:
- LOW COMPRESSION
MSRP: $410.95Now: $369.86Was: $410.95 -
On Sale
S&S CYCLE Piston Kit 106-5514
S&S CYCLE
MSRP: $410.95Now: $369.86Was: $410.95If you're building or rebuilding a high-performance engine, piston quality directly impacts reliability, longevity, and power output. The S&S Cycle 106-5514 delivers forged strength with modern alloy...09101926- SKU:
- 09101926
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- DISPLACEMENT:
- 80'
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- BORE SIZE IMPERIAL:
- 3.530'
- COMPRESSION RATIO IMPERIAL:
- 8.0:1
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- TYPE:
- LOW COMPRESSION
- UNITS:
- KIT
- BORE OVERSIZE - IMPERIAL:
- +0.030'
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +0,030'
MSRP: $410.95Now: $369.86Was: $410.95 -
On Sale
S&S CYCLE Piston Kit 106-5503
S&S CYCLE
MSRP: $469.95Now: $422.96Was: $469.95Engine longevity and reliable power delivery depend on piston quality—and S&S Cycle's forged construction delivers the strength and thermal stability your engine demands. Whether you're building a...09101927- SKU:
- 09101927
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- STREET
- TYPE:
- HIGH COMPRESSION
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- BORE SIZE IMPERIAL:
- 3.4375'
- DISPLACEMENT:
- 74'
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH IMPERIAL:
- 3-31/32'
- UNITS:
- KIT
MSRP: $469.95Now: $422.96Was: $469.95Qty in Cart: 0Quantity:Price:MSRP: $469.95Now: $422.96Was: $469.95Subtotal: -
On Sale
S&S CYCLE Piston Kit 106-5519
S&S CYCLE
MSRP: $410.95Now: $369.86Was: $410.95A quality piston kit is the foundation of a reliable, high-revving engine—and the S&S Cycle 106-5519 delivers the strength and precision your build demands. Forged construction provides superior...09101932- SKU:
- 09101932
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 80'
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- TYPE:
- HIGH COMPRESSION
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE IMPERIAL:
- 3.500'
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
MSRP: $410.95Now: $369.86Was: $410.95Qty in Cart: 0Quantity:Price:MSRP: $410.95Now: $369.86Was: $410.95Subtotal: -
On Sale
S&S CYCLE Piston Kit 106-5520
S&S CYCLE
MSRP: $410.95Now: $369.86Was: $410.95Whether you're building a high-output big-twin or refreshing a time-tested engine, the S&S Cycle 106-5520 piston kit delivers the strength and longevity you need for sustained performance. Forged...09101933- SKU:
- 09101933
- Availability:
- Ships Same Business Day
- Weight:
- 2.95 LBS
- BORE - OVERSIZE:
- +0,010'
- DISPLACEMENT:
- 80'
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- BORE SIZE IMPERIAL:
- 3.510'
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- BORE OVERSIZE - IMPERIAL:
- +0.010'
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- STREET
- TYPE:
- HIGH COMPRESSION
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
MSRP: $410.95Now: $369.86Was: $410.95 -
On Sale
S&S CYCLE Piston Kit 106-5521
S&S CYCLE
MSRP: $410.95Now: $369.86Was: $410.95When you're building or rebuilding a high-performance engine, your pistons are the foundation of reliability and power delivery. The S&S Cycle 106-5521 piston kit delivers forged strength and modern...09101934- SKU:
- 09101934
- Availability:
- Ships Same Business Day
- Weight:
- 3.00 LBS
- BORE - OVERSIZE:
- +0,020'
- BORE SIZE IMPERIAL:
- 3.520'
- DISPLACEMENT:
- 80'
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- BORE OVERSIZE - IMPERIAL:
- +0.020'
- PISTON MATERIAL:
- FORGED
- TYPE:
- HIGH COMPRESSION
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
MSRP: $410.95Now: $369.86Was: $410.95 -
On Sale
S&S CYCLE Piston Kit 106-5522
S&S CYCLE
MSRP: $410.95Now: $369.86Was: $410.95Engine longevity and reliable performance depend on pistons engineered to withstand extreme combustion pressures without sacrificing efficiency. The S&S Cycle Piston Kit 106-5522 delivers forged...09101935- SKU:
- 09101935
- Availability:
- Ships Same Business Day
- Weight:
- 3.00 LBS
- BORE - OVERSIZE:
- +0,030'
- DISPLACEMENT:
- 80'
- STROKE LENGTH IMPERIAL:
- 4-1/4'
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.530'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- TYPE:
- HIGH COMPRESSION
- BORE OVERSIZE - IMPERIAL:
- +0.030'
- PISTON MATERIAL:
- FORGED
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
MSRP: $410.95Now: $369.86Was: $410.95Qty in Cart: 0Quantity:Price:MSRP: $410.95Now: $369.86Was: $410.95Subtotal:
