S&S Cycle 4-3/8 in Stroke Flywheel with Full Width Rods and Balancer Gear, Model 2017 M8, Part 320-0604

The flywheels are the heart of any performance engine and S&S Cycle has been perfecting the art for over six decades. Stronger, more durable, and trued to a spec others can only dream of, the new cranks for the Milwaukee-Eight® platform are the best of the best to build your high performance engine around.

• S&S High Strength Connecting Rods are designed with Finite Element Analysis to eliminate weak spots and handle more power!
• Heat Treated 4140 Material is harder & more than twice as strong as stock
• Full width wristpin connecting rods (requires S&S Performance Pistons)
• Stronger assembly eliminates need to weld crankpin
• Balanced for S&S Performance piston weight (1213g)
• Capable of higher RPM - More available power!
• Consistent balance & precision machining
• 4-3/8" Stroke (107 or 124ci)
• Perfect for Gear Drive Cams
• Balance Gear installed

The S&S Cycle 4-3/8-inch stroke flywheel assembly with full-width connecting rods and balancer gear is designed for 2017 Harley-Davidson Milwaukee-Eight models. Part number 320-0604 is manufactured by S&S Cycle and is also identified by vendor part number 320-0604.

The assembly features S&S High Strength Connecting Rods designed using Finite Element Analysis to help eliminate weak spots and handle increased power. The heat-treated 4140 material is harder and more than twice as strong as stock. Full-width wristpin connecting rods require S&S Performance Pistons. The stronger assembly eliminates the need to weld the crankpin and is balanced for S&S Performance piston weight of 1,213 grams.

With a 4-3/8-inch stroke, this flywheel is intended for 107 or 124 cubic-inch applications and is suitable for use with gear-drive cams. A balance gear is installed, and the assembly is designed for consistent balance, precision machining, and higher-RPM capability. Fitment includes the 2017 Harley-Davidson FLRT Freewheeler, FLHR Road King, FLHX Street Glide, FLTRX Road Glide, FLHXS Street Glide Special, FLTRXS Road Glide Special, FLHTCU Electra Glide Ultra Classic, FLTRU Road Glide Ultra, FLHTK Ultra Limited, and FLHTKL Ultra Limited Low.

Features:

• 4-3/8-inch stroke for 107 or 124 cubic-inch applications
• S&S High Strength Connecting Rods designed with Finite Element Analysis
• Heat-treated 4140 connecting rod material is harder and more than twice as strong as stock
• Full-width wristpin connecting rods require S&S Performance Pistons
• Stronger assembly eliminates the need to weld the crankpin
• Balanced for S&S Performance piston weight of 1,213 grams
• Designed for higher-RPM capability and increased available power
• Consistent balance and precision machining
• Suitable for gear-drive cam applications
• Balance gear installed
• Fits specified 2017 Harley-Davidson Milwaukee-Eight models

Air Freight Prohibited: false
Not Carb Approved: true
Ltl Freight Required: false
Prop 65: Unknown
Part Type: powersports
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: false
Units Per Sku: 1
Fitment:
2017 Harley Davidson FLHR Road King Base
2017 Harley Davidson FLHRXS Road King Special Base
2017 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2017 Harley Davidson FLHTK Ultra Limited Base
2017 Harley Davidson FLHTKL Ultra Limited Low Base
2017 Harley Davidson FLHTKSE CVO Limited Base
2017 Harley Davidson FLHX Street Glide Base
2017 Harley Davidson FLHXS Street Glide Special Base
2017 Harley Davidson FLHXSE CVO Street Glide Base
2017 Harley Davidson FLRT Freewheeler Base
2017 Harley Davidson FLTRU Road Glide Ultra Base
2017 Harley Davidson FLTRX Road Glide Base
2017 Harley Davidson FLTRXS Road Glide Special Base
2018 Harley Davidson FLDE Deluxe 107 Base
2018 Harley Davidson FLFBS Fat Boy 114 Base
2018 Harley Davidson FLHCS Heritage Classic 114 Base
2018 Harley Davidson FLHR Road King Base
2018 Harley Davidson FLHRXS Road King Special Base
2018 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2018 Harley Davidson FLHTK Ultra Limited Base
2018 Harley Davidson FLHTKL Ultra Limited Low Base
2018 Harley Davidson FLHTKSE CVO Limited Base
2018 Harley Davidson FLHX Street Glide Base
2018 Harley Davidson FLHXS Street Glide Special Base
2018 Harley Davidson FLHXSE CVO Street Glide Base
2018 Harley Davidson FLRT Freewheeler Base
2018 Harley Davidson FLTRU Road Glide Ultra Base
2018 Harley Davidson FLTRX Road Glide Base
2018 Harley Davidson FLTRXS Road Glide Special Base
2018 Harley Davidson FXBRS Breakout 114 Base
2018 Harley Davidson FXFBS Fat Bob 114 Base
2019 Harley Davidson FLDE Deluxe 107 Base
2019 Harley Davidson FLFBS Fat Boy 114 Base
2019 Harley Davidson FLHCS Heritage Classic 114 Base
2019 Harley Davidson FLHR Road King Base
2019 Harley Davidson FLHRXS Road King Special Base
2019 Harley Davidson FLHT Electra Glide Standard Base
2019 Harley Davidson FLHTCU Electra Glide Ultra Classic Base
2019 Harley Davidson FLHTK Ultra Limited Base
2019 Harley Davidson FLHTKL Ultra Limited Low Base
2019 Harley Davidson FLHTKSE CVO Limited Base
2019 Harley Davidson FLHX Street Glide Base
2019 Harley Davidson FLHXS Street Glide Special Base
2019 Harley Davidson FLHXSE CVO Street Glide Base
2019 Harley Davidson FLRT Freewheeler Base
2019 Harley Davidson FLTRU Road Glide Ultra Base
2019 Harley Davidson FLTRX Road Glide Base
2019 Harley Davidson FLTRXS Road Glide Special Base
2019 Harley Davidson FXBRS Breakout 114 Base
2019 Harley Davidson FXDRS FXDR 114 Base
2019 Harley Davidson FXFBS Fat Bob 114 Base
2020 Harley Davidson FLDE Deluxe 107 Base
2020 Harley Davidson FLFBS Fat Boy 114 Base
2020 Harley Davidson FLHCS Heritage Classic 114 Base
2020 Harley Davidson FLHR Road King Base
2020 Harley Davidson FLHRXS Road King Special Base
2020 Harley Davidson FLHT Electra Glide Standard Base
2020 Harley Davidson FLHTCUTGSE CVO Tri Glide Base
2020 Harley Davidson FLHTK Ultra Limited Base
2020 Harley Davidson FLHTKSE CVO Limited Base
2020 Harley Davidson FLHX Street Glide Base
2020 Harley Davidson FLHXS Street Glide Special Base
2020 Harley Davidson FLHXSE CVO Street Glide Base
2020 Harley Davidson FLRT Freewheeler Base
2020 Harley Davidson FLTRK Road Glide Limited Base
2020 Harley Davidson FLTRX Road Glide Base
2020 Harley Davidson FLTRXS Road Glide Special Base
2020 Harley Davidson FXBRS Breakout 114 Base
2020 Harley Davidson FXDRS FXDR 114 Base
2020 Harley Davidson FXFBS Fat Bob 114 Base
2020 Harley Davidson FXLRS Low Rider S 114 Base
2021 Harley Davidson FLFBS Fat Boy 114 Base
2021 Harley Davidson FLHCS Heritage Classic 114 Base
2021 Harley Davidson FLHR Road King Base
2021 Harley Davidson FLHRXS Road King Special Base
2021 Harley Davidson FLHT Electra Glide Standard Base
2021 Harley Davidson FLHTCUTGSE CVO Tri Glide Base
2021 Harley Davidson FLHTK Ultra Limited Base
2021 Harley Davidson FLHTKSE CVO Limited Base
2021 Harley Davidson FLHX Street Glide Base
2021 Harley Davidson FLHXS Street Glide Special Base
2021 Harley Davidson FLHXSE CVO Street Glide Base
2021 Harley Davidson FLRT Freewheeler Base
2021 Harley Davidson FLTRK Road Glide Limited Base
2021 Harley Davidson FLTRX Road Glide Base
2021 Harley Davidson FLTRXS Road Glide Special Base
2021 Harley Davidson FXFBS Fat Bob 114 Base