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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On Sale
S&S CYCLE Motor Sprocket Shaft Assembly - Big Twin 33-2004
S&S CYCLE
MSRP: $163.95Now: $147.56Was: $163.95The S&S Cycle Motor Sprocket Shaft Assembly is engineered for Big Twin engines that demand reliable power transfer and precise timing control. This domestically manufactured component ensures...09210221- SKU:
- 09210221
- Availability:
- Ships Same Business Day
- Weight:
- 1.79 LBS
- PRODUCT NAME:
- SPROCKET SHAFT ASSEMBLY
- UNITS:
- EACH
- RIDING STYLE:
- STREET
MSRP: $163.95Now: $147.56Was: $163.95 -
On Sale
S&S CYCLE Flywheel Assembly - Twin Cam 320-0353
S&S CYCLE
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95If you're building a high-performance Twin Cam engine that demands reliability under extreme load, the S&S CYCLE 3-piece flywheel assembly eliminates the weak link in your drivetrain. The larger 1...09220111- SKU:
- 09220111
- Availability:
- Ships Same Business Day
- Weight:
- 37.07 LBS
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4-3/8'
- ENGINE TYPE:
- 'A' MOTOR
- MATERIAL:
- STEEL
- FEATURES:
- WITHOUT SPROCKET BEARING RACE
- PRODUCT NAME:
- FLYWHEEL ASSEMBLY
- UNITS:
- EACH
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95 -
On Sale
S&S CYCLE Flywheel Assembly - Twin Cam 320-0359
S&S CYCLE
MSRP: $1,795.95Now: $1,616.36Was: $1,795.95If you're pushing your Twin Cam engine to its limits, a stock flywheel assembly won't cut it. The S&S Cycle 3-piece flywheel is purpose-built for high-RPM reliability and sustained performance,...09220112- SKU:
- 09220112
- Availability:
- Ships Same Business Day
- Weight:
- 39.20 LBS
- ENGINE TYPE:
- 'B' MOTOR
- MATERIAL:
- STEEL
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4-3/8'
- FEATURES:
- WITHOUT SPROCKET BEARING RACE
- PRODUCT NAME:
- FLYWHEEL ASSEMBLY
- UNITS:
- EACH
MSRP: $1,795.95Now: $1,616.36Was: $1,795.95 -
On Sale
S&S CYCLE Flywheel Assembly - Twin Cam 320-0403
S&S CYCLE
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95If you're running high-horsepower forced induction or high-RPM applications, your stock flywheel assembly is a liability waiting to fail. The S&S Cycle 3-piece flywheel with integral main shaft...09220113- SKU:
- 09220113
- Availability:
- Ships Same Business Day
- Weight:
- 38.50 LBS
- FEATURES:
- WITHOUT SPROCKET BEARING RACE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- FLYWHEEL ASSEMBLY
- UNITS:
- EACH
- ENGINE TYPE:
- 'A' MOTOR
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4'
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95 -
On Sale
S&S CYCLE Flywheel Assembly - Twin Cam 320-0397
S&S CYCLE
MSRP: $1,794.95Now: $1,615.46Was: $1,794.95If you're running high-rpm applications or building a bulletproof Harley-Davidson Twin Cam engine, stock flywheels are your weak link. S&S Cycle's 3-piece flywheel assembly eliminates the failure...09220114- SKU:
- 09220114
- Availability:
- Ships Same Business Day
- Weight:
- 38.84 LBS
- FEATURES:
- WITHOUT SPROCKET BEARING RACE
- PRODUCT NAME:
- FLYWHEEL ASSEMBLY
- MATERIAL:
- STEEL
- UNITS:
- EACH
- ENGINE TYPE:
- 'B' MOTOR
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4'
MSRP: $1,794.95Now: $1,615.46Was: $1,794.95Qty in Cart: 0Quantity:Price:MSRP: $1,794.95Now: $1,615.46Was: $1,794.95Subtotal: -
On Sale
S&S CYCLE Stroker Kit - 106" 320-0450
S&S CYCLE
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95If you're running a stock or early 95" big-twin motor and want genuine displacement gains without extensive case work, the S&S 106" Stroker Kit delivers the cubic inches you need with minimal...09220115- SKU:
- 09220115
- Availability:
- Ships Same Business Day
- Weight:
- 39.32 LBS
- DISPLACEMENT:
- 106'
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- FLYWHEEL ASSEMBLY
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- FEATURES:
- WITHOUT SPROCKET BEARING RACE
- TYPE:
- STROKER
- STROKE LENGTH IMPERIAL:
- 4-1/2'
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95Qty in Cart: 0Quantity:Price:MSRP: $1,695.95Now: $1,526.36Was: $1,695.95Subtotal: -
On Sale
S&S CYCLE Stroker Kit - 106" 320-0460
S&S CYCLE
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95If you're serious about maximizing displacement and low-end torque in your big-twin Harley, the S&S CYCLE 106" Stroker Kit delivers the cubic inches you need without requiring expensive case...09220117- SKU:
- 09220117
- Availability:
- Ships Same Business Day
- Weight:
- 39.20 LBS
- DISPLACEMENT:
- 106'
- PRODUCT NAME:
- FLYWHEEL ASSEMBLY
- RIDING STYLE:
- STREET
- FEATURES:
- WITHOUT SPROCKET BEARING RACE
- STROKE LENGTH IMPERIAL:
- 4-1/2'
- TYPE:
- STROKER
- ENGINE TYPE:
- 4-STROKE
- UNITS:
- EACH
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95 -
On Sale
S&S CYCLE Stroker Kit - 106" 320-0454
S&S CYCLE
MSRP: $1,794.95Now: $1,615.46Was: $1,794.95If you're serious about maximizing displacement and power output on your Harley-Davidson, the S&S Cycle 106" Stroker Kit delivers the cubic inches and mechanical advantage you need. This...09220118- SKU:
- 09220118
- Availability:
- Ships Same Business Day
- Weight:
- 39.45 LBS
- FEATURES:
- WITHOUT SPROCKET BEARING RACE
- STROKE LENGTH IMPERIAL:
- 4-1/2'
- TYPE:
- STROKER
- DISPLACEMENT:
- 106'
- PRODUCT NAME:
- FLYWHEEL ASSEMBLY
- RIDING STYLE:
- STREET
- ENGINE TYPE:
- 4-STROKE
- UNITS:
- EACH
MSRP: $1,794.95Now: $1,615.46Was: $1,794.95 -
On Sale
S&S CYCLE Flywheel - Stroker - Twin Cam 320-0402
S&S CYCLE
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95If you're building a high-displacement stroker engine or pushing power limits on a Twin Cam platform, the factory flywheel becomes your weak point. The S&S Cycle Stroker Flywheel eliminates that...09220119- SKU:
- 09220119
- Availability:
- Ships Same Business Day
- Weight:
- 38.60 LBS
- RIDING STYLE:
- STREET
- STROKE LENGTH IMPERIAL:
- 4'
- ENGINE TYPE:
- 'A' MOTOR
- FEATURES:
- WITH SPROCKET BEARING RACE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- FLYWHEEL ASSEMBLY
- UNITS:
- EACH
MSRP: $1,695.95Now: $1,526.36Was: $1,695.95 -
On Sale
S&S CYCLE Replacement Pistons with Rings 92-2026
S&S CYCLE
MSRP: $484.95Now: $436.46Was: $484.95If you're building or rebuilding a high-performance engine with S&S Cycle heads, these replacement pistons are essential to unlocking the full potential of your investment. The 10:1 compression ratio...09100005- SKU:
- 09100005
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE OVERSIZE - IMPERIAL:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PISTON HEAD SHAPE:
- DOMED
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
MSRP: $484.95Now: $436.46Was: $484.95 -
On Sale
S&S CYCLE Replacement Pistons with Rings 92-20265
S&S CYCLE
MSRP: $459.95Now: $413.96Was: $459.95Whether you're building a high-compression Harley engine or upgrading an existing platform, S&S Cycle pistons deliver the compression ratio and ring sealing you need for consistent power gains and...09100006- SKU:
- 09100006
- Availability:
- Ships Same Business Day
- Weight:
- 2.90 LBS
- BORE OVERSIZE - IMPERIAL:
- +0.005'
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.500'
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,005'
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- PISTON HEAD SHAPE:
- DOMED
MSRP: $459.95Now: $413.96Was: $459.95 -
On Sale
S&S CYCLE Retro Top End Conversion Kit 106-1071
S&S CYCLE
MSRP: $4,499.95Now: $4,049.96Was: $4,499.95If you're running a Shovelhead and want that classic Panhead aesthetic without sacrificing modern reliability, the S&S Cycle Retro Top End Conversion Kit delivers authentic vintage looks backed by...09300090- SKU:
- 09300090
- Availability:
- Ships Same Business Day
- Weight:
- 40.87 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- TYPE:
- CYLINDER
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.625'
- PRODUCT NAME:
- CONVERSION KIT
MSRP: $4,499.95Now: $4,049.96Was: $4,499.95 -
On Sale
S&S CYCLE Performance Replacement Head 106-3466
S&S CYCLE
MSRP: $1,559.95Now: $1,403.96Was: $1,559.95The S&S Cycle Performance Replacement Head (106-3466) delivers measurable gains in airflow and compression without sacrificing the reliability you need for sustained high-RPM operation. Built for...09300060- SKU:
- 09300060
- Availability:
- Ships Same Business Day
- Weight:
- 24.00 LBS
- COLOR/FINISH:
- POWDER-COATED
- COLOR/FINISH:
- SILVER
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- SUPER STOCK
- PRODUCT NAME:
- CYLINDER HEAD KIT
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- DISPLACEMENT:
- 82 CC
MSRP: $1,559.95Now: $1,403.96Was: $1,559.95 -
On Sale
S&S CYCLE Performance Replacement Head 106-4570
S&S CYCLE
MSRP: $1,559.95Now: $1,403.96Was: $1,559.95If you're running a smaller-displacement engine and leaving performance on the table with stock heads, the S&S CYCLE 106-4570 delivers measurable gains in flow and compression without sacrificing the...09300061- SKU:
- 09300061
- Availability:
- Ships Same Business Day
- Weight:
- 24.25 LBS
- PRODUCT NAME:
- CYLINDER HEAD KIT
- DISPLACEMENT:
- 82 CC
- MATERIAL:
- STAINLESS STEEL
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPER STOCK
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
MSRP: $1,559.95Now: $1,403.96Was: $1,559.95 -
On Sale
S&S CYCLE Cam - 465C - M8 310-1007B
S&S CYCLE
MSRP: $1,721.95Now: $1,549.76Was: $1,721.95The S&S CYCLE 465C cam is engineered for riders who demand reliable torque delivery and stable valvetrain operation across high-RPM, high-lift conditions. This billet-aluminum cam eliminates the...09251357- SKU:
- 09251357
- Availability:
- Ships Same Business Day
- Weight:
- 11.25 LBS
- TYPE:
- CHAIN
- GRIND:
- 465C
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- GLOSS
- FEATURES:
- WATER COOLED
- PRODUCT NAME:
- CAMCHEST KIT
- UNITS:
- KIT
MSRP: $1,721.95Now: $1,549.76Was: $1,721.95Qty in Cart: 0Quantity:Price:MSRP: $1,721.95Now: $1,549.76Was: $1,721.95Subtotal: -
On Sale
S&S CYCLE Cam Chest Kit - 475C - M8 310-1008B
S&S CYCLE
MSRP: $1,721.95Now: $1,549.76Was: $1,721.95The S&S CYCLE 475C Cam Chest Kit transforms your M8's oiling system into a precision-engineered circuit capable of supporting high-RPM performance without compromise. Independent scavenge sections...09251358- SKU:
- 09251358
- Availability:
- Ships Same Business Day
- Weight:
- 10.90 LBS
- TYPE:
- CHAIN
- COLOR/FINISH:
- GLOSS
- RIDING STYLE:
- STREET
- GRIND:
- 475C
- COLOR/FINISH:
- BLACK
- FEATURES:
- WATER COOLED
- PRODUCT NAME:
- CAMCHEST KIT
- UNITS:
- KIT
MSRP: $1,721.95Now: $1,549.76Was: $1,721.95Qty in Cart: 0Quantity:Price:MSRP: $1,721.95Now: $1,549.76Was: $1,721.95Subtotal: -
On Sale
S&S CYCLE Cam - 465C - M8 310-1011B
S&S CYCLE
MSRP: $1,721.95Now: $1,549.76Was: $1,721.95The S&S Cycle 465C cam is engineered for M8 Harley-Davidson engines that demand reliable torque delivery across the RPM band without sacrificing longevity. If you're running a touring rig or street...09251359- SKU:
- 09251359
- Availability:
- Ships Same Business Day
- Weight:
- 11.30 LBS
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- CAMCHEST KIT
- UNITS:
- KIT
- COLOR/FINISH:
- GLOSS
- GRIND:
- 465C
- RIDING STYLE:
- STREET
- FEATURES:
- OIL COOLED
- TYPE:
- CHAIN
MSRP: $1,721.95Now: $1,549.76Was: $1,721.95Qty in Cart: 0Quantity:Price:MSRP: $1,721.95Now: $1,549.76Was: $1,721.95Subtotal: -
On Sale
S&S CYCLE Cam with Plate - 550C - M8 - Twin Cooled 310-1080B
S&S CYCLE
MSRP: $1,899.95Now: $1,709.96Was: $1,899.95If you're building a high-displacement M8 engine that demands reliable oiling under sustained high-RPM operation, the S&S Cycle Cam with Plate 550C delivers the flow capacity and debris protection...09251361- SKU:
- 09251361
- Availability:
- Ships Same Business Day
- Weight:
- 12.35 LBS
- COLOR/FINISH:
- CHROME
- GRIND:
- 550C
- FEATURES:
- WATER COOLED
- PRODUCT NAME:
- CAMCHEST KIT
- UNITS:
- KIT
- TYPE:
- CHAIN
- RIDING STYLE:
- STREET
MSRP: $1,899.95Now: $1,709.96Was: $1,899.95Qty in Cart: 0Quantity:Price:MSRP: $1,899.95Now: $1,709.96Was: $1,899.95Subtotal: -
On Sale
S&S CYCLE Camshaft - 540C - Chain Drive - M8 310-1118A
S&S CYCLE
MSRP: $1,721.95Now: $1,549.76Was: $1,721.95If you're running a big-bore M8 and prioritizing low-to-mid-range torque delivery, the S&S Cycle 540C camshaft is engineered to maximize power below 6000 rpm—ideal for street performance, cruising,...09251363- SKU:
- 09251363
- Availability:
- Ships Same Business Day
- Weight:
- 12.10 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CAMCHEST KIT
- UNITS:
- KIT
- FEATURES:
- OIL COOLED
- GRIND:
- 540G
- RIDING STYLE:
- STREET
- TYPE:
- CHAIN
MSRP: $1,721.95Now: $1,549.76Was: $1,721.95 -
On Sale
S&S CYCLE HVHP Oil Pump Kit - Universal 31-6302
S&S CYCLE
MSRP: $715.95Now: $644.36Was: $715.95Stock oil pumps struggle to handle the demands of modified engines—they under-deliver volume on the supply side while failing to scavenge adequately on the return, leading to excessive crankcase...316302- SKU:
- 316302
- Availability:
- Ships Same Business Day
- Weight:
- 3.60 LBS
- UNITS:
- KIT
- BASE COLOR:
- SILVER
- FLOW RATE:
- HIGH VOLUME
- COLOR/FINISH:
- ALUMINUM
- FEATURES:
- S&S FLYWHEELS OR PINION SHAFT
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PUMP
- RIDING STYLE:
- STREET
- STYLE:
- UNIVERSAL COVER
- TYPE:
- OIL
MSRP: $715.95Now: $644.36Was: $715.95
