S&S CYCLE - 320-0477 - Flywheel Assembly - 4-5/8” - 124” Big Twin '84-'99
For riders who demand quality in every component, the S&S CYCLE 320-0477 is a flywheel assembly built to the standards that experienced powersports enthusiasts recognize the moment they put it in their hands. Replaces the original flywheels in S&S® 124” V124 engine for '84-'99 Big Twin. Pinion and sprocket shafts are forged as part of the flywheel, giving you a level of quality that holds up across the full service life of the component. The only joints in the assembly are where the 1.671” diameter connecting rod crankpin is pressed into the flywheels. CNC machined from heat-treated, closed die, steel forgings, which are 114% stronger than late style stock steel flywheels. Fully assembled with premium quaility S&S® heavy duty 7.667” connecting rods, with full width wrist pin ends, and dynamically balanced. Whatever the application demands, the 320-0477 gives you a component built to meet it. Sold individually.
Features
- Replaces the original flywheels in S&S® 124” V124 engine for '84-'99 Big Twin
- Pinion and sprocket shafts are forged as part of the flywheel
- The only joints in the assembly are where the 1.671” diameter connecting rod crankpin is pressed into the flywheels
- CNC machined from heat-treated, closed die, steel forgings, which are 114% stronger than late style stock steel flywheels
- Fully assembled with premium quaility S&S® heavy duty 7.667” connecting rods, with full width wrist pin ends, and dynamically balanced
- Assembly is trued to less than .0005” runout on pinion and sprocket shaft bearing surfaces, making them capable of higher rpm
- Three piece design
- Left side flywheel is notched for crank position sensor.
- Balanced for S&S stock bore and 3-5/8” stroker pistons.
Specs
- Material: Steel
- Stroke Length: 4-5/8”
- Engine Type: S&S V-Series
- Product Name: Flywheel Assembly
- Riding Style: Street
- Units: Each
- Displacement: 124”
Frequently Asked Questions - S&S CYCLE - 320-0477 - Flywheel Assembly - 4-5/8” - 124” Big Twin '84-'99
How do I know if this part fits my vehicle?
Check the fitment information listed on this page against your exact year, make, model, and (where applicable) trim, engine size, or configuration. If your exact vehicle isn't listed, or you're not sure, use the product chat on this page or contact our support team before ordering - we're glad to help confirm fitment.
What does it mean if a product is listed as universal fit?
Universal fit means the product is designed to work across a range of vehicles, not that it's guaranteed to fit every one. Compare the listed measurements, mounting requirements, and connector or hardware specs against your specific vehicle before ordering, since some installations may need additional hardware or minor fabrication.
Where can I find installation instructions for this product?
General installation notes are provided above where available. For detailed step-by-step instructions, refer to the manufacturer's documentation included with the product, or use the product chat on this page for questions about difficulty, required tools, or whether professional installation is recommended.
What if I have more questions about this product?
Use the product chat on this page for fitment, specs, installation, and compatibility questions, or contact our support team directly for help before you order.
