S&S Cycle 4-1/2in Stroke Flywheel with Tapered Rods and Balancer Gear, 2017 M8 Models, Part 320-0598

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
• Tapered wristpin connecting rods compatible with stock pistons
• Stronger assembly eliminates need to weld crankpin
• Capable of higher RPM - More available power!
• Balanced for stock piston weight (1060g)
• Consistent balance & precision machining
• 4-1/2" Stroke (114 or 128ci)
• Perfect for Gear Drive Cams
• Balance Gear installed

The S&S Cycle 4-1/2in Stroke Flywheel with Tapered Rods and Balancer Gear is designed for 2017 Harley-Davidson Milwaukee-Eight applications. Manufacturer part number 320-0598 and vendor part number 320-0598 identify this performance engine assembly from S&S Cycle.

The flywheel assembly features S&S High Strength Connecting Rods designed using Finite Element Analysis to help eliminate weak spots and handle increased power. Heat-treated 4140 material is harder and more than twice as strong as stock, while the tapered wristpin connecting rods are compatible with stock pistons. The stronger assembly eliminates the need to weld the crankpin and is capable of higher RPM for increased available power.

This assembly is balanced for a stock piston weight of 1060g and includes consistent balance, precision machining, and an installed balance gear. The 4-1/2in stroke is specified for 114 or 128ci applications and is suitable for gear drive cams.

Fitment includes the 2017 Harley-Davidson FLSTC Heritage Softail Classic, FLRT Freewheeler, FLHTCUTG Tri Glide Ultra, FLHR Road King, FLHX Street Glide, FLTRX Road Glide, FLHXS Street Glide Special, FLTRXS Road Glide Special, FLHTCU Electra Glide Ultra Classic, and FLTRU Road Glide Ultra.

Features:

• High-strength connecting rods designed with Finite Element Analysis to help eliminate weak spots and handle more power
• Heat-treated 4140 material is harder and more than twice as strong as stock
• Tapered wristpin connecting rods compatible with stock pistons
• Stronger assembly eliminates the need to weld the crankpin
• Capable of higher RPM for more available power
• Balanced for stock piston weight of 1060g
• Consistent balance and precision machining
• 4-1/2in stroke for 114 or 128ci applications
• Suitable for gear drive cams
• Balance gear installed

Air Freight Prohibited: false
Not Carb Approved: false
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 FLHTCUTG Tri Glide Ultra 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 FLSTC Heritage Softail Classic Base
2017 Harley Davidson FLTRU Road Glide Ultra Base
2017 Harley Davidson FLTRX Road Glide Base
2017 Harley Davidson FLTRXS Road Glide Special Base
2017 Harley-Davidson FLHRC Road King Classic Base
2018 Harley Davidson FLDE Deluxe 107 Base
2018 Harley Davidson FLFB Fat Boy 107 Base
2018 Harley Davidson FLFBS Fat Boy 114 Base
2018 Harley Davidson FLHC Heritage Classic 107 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 FLHTCUTG Tri Glide Ultra 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 FLSB Sport Glide 107 Base
2018 Harley Davidson FLSL Softail Slim 107 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 FLTRXSE CVO Road Glide Base
2018 Harley Davidson FXBB Street Bob 107 Base
2018 Harley Davidson FXBR Breakout 107 Base
2018 Harley Davidson FXBRS Breakout 114 Base
2018 Harley Davidson FXFB Fat Bob 107 Base
2018 Harley Davidson FXFBS Fat Bob 114 Base
2018 Harley Davidson FXLR Low Rider 107 Base
2018 Harley-Davidson FLHRC Road King Classic Base
2019 Harley Davidson FLDE Deluxe 107 Base
2019 Harley Davidson FLFB Fat Boy 107 Base
2019 Harley Davidson FLFBS Fat Boy 114 Base
2019 Harley Davidson FLHC Heritage Classic 107 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 FLHTCUTG Tri Glide Ultra 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 FLSB Sport Glide 107 Base
2019 Harley Davidson FLSL Softail Slim 107 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 FLTRXSE CVO Road Glide Base
2019 Harley Davidson FXBB Street Bob 107 Base
2019 Harley Davidson FXBR Breakout 107 Base
2019 Harley Davidson FXBRS Breakout 114 Base
2019 Harley Davidson FXDRS FXDR 114 Base
2019 Harley Davidson FXFB Fat Bob 107 Base
2019 Harley Davidson FXFBS Fat Bob 114 Base
2019 Harley Davidson FXLR Low Rider 107 Base
2019 Harley-Davidson FLHRC Road King Classic Base
2020 Harley Davidson FLDE Deluxe 107 Base
2020 Harley Davidson FLFBS Fat Boy 114 Base
2020 Harley Davidson FLHC Heritage Classic 107 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 FLHTCUTG Tri Glide Ultra Base
2020 Harley Davidson FLHTCUTGSE CVO Tri Glide 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 FLSB Sport Glide 107 Base
2020 Harley Davidson FLSL Softail Slim 107 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 FLTRXSE CVO Road Glide Base
2020 Harley Davidson FXBB Street Bob 107 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 FXLR Low Rider 107 Base
2020 Harley Davidson FXLRS Low Rider S 114 Base
2020 Harley Davidson FXST Softail Standard 107 Base
2020 Harley-Davidson FLFB Fat Boy 107 Base
2020 Harley-Davidson FXFB Fat Bob 107 Base
2021 Harley Davidson FLFBS Fat Boy 114 Base
2021 Harley Davidson FLH Electra Glide Revival Base
2021 Harley Davidson FLHC Heritage Classic 107 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 FLHTCUTG Tri Glide Ultra Base
2021 Harley Davidson FLHTCUTGSE CVO Tri Glide 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 FLSB Sport Glide 107 Base
2021 Harley Davidson FLSL Softail Slim 107 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 FLTRXSE CVO Road Glide Base
2021 Harley Davidson FXBBS Street Bob 114 Base
2021 Harley Davidson FXFBS Fat Bob 114 Base
2021 Harley Davidson FXLRS Low Rider S 114 Base
2021 Harley Davidson FXST Softail Standard 107 Base
2022 Harley-Davidson FLFBS Fat Boy 114 Base
2022 Harley-Davidson FLHCS Heritage Classic 114 Base
2022 Harley-Davidson FLHR Road King Base
2022 Harley-Davidson FLHRXS Road King Special Base
2022 Harley-Davidson FLHT Electra Glide Standard Base
2022 Harley-Davidson FLHTCUTG Tri Glide Ultra Base
2022 Harley-Davidson FLHTCUTG Tri Glide Ultra G.I. Base
2022 Harley-Davidson FLHTCUTGSE CVO Tri Glide Base
2022 Harley-Davidson FLHX Street Glide Base
2022 Harley-Davidson FLHXS Street Glide Special Base
2022 Harley-Davidson FLHXSE CVO Street Glide Base
2022 Harley-Davidson FLHXST Street Glide ST Base
2022 Harley-Davidson FLRT Freewheeler Base
2022 Harley-Davidson FLSB Sport Glide 107 Base
2022 Harley-Davidson FLTRK Road Glide Limited Base
2022 Harley-Davidson FLTRKSE CVO Road Glide Limited Base
2022 Harley-Davidson FLTRX Road Glide Base
2022 Harley-Davidson FLTRXS Road Glide Special Base
2022 Harley-Davidson FLTRXSE CVO Road Glide Base
2022 Harley-Davidson FLTRXST Road Glide ST Base
2022 Harley-Davidson FXBBS Street Bob 114 Base
2022 Harley-Davidson FXFBS Fat Bob 114 Base
2022 Harley-Davidson FXLRS Low Rider S 117 Base
2022 Harley-Davidson FXLRST Low Rider ST 117 Base
2022 Harley-Davidson FXRST Low Rider El Diablo 117 Base
2022 Harley-Davidson FXST Softail Standard 107 Base
2023 Harley-Davidson FLFBS Fat Boy 114 Base
2023 Harley-Davidson FLHCS Heritage Classic 114 Base
2023 Harley-Davidson FLHFB Electra Glide Highway King Base
2023 Harley-Davidson FLHRXS Road King Special Base
2023 Harley-Davidson FLHTCUTG Tri Glide Ultra Base
2023 Harley-Davidson FLHX Street Glide Base
2023 Harley-Davidson FLHXS Street Glide Special Base
2023 Harley-Davidson FLHXSE CVO Street Glide Base
2023 Harley-Davidson FLHXST Street Glide ST Base
2023 Harley-Davidson FLRT Freewheeler Base
2023 Harley-Davidson FLSB Sport Glide 107 Base
2023 Harley-Davidson FLTRK Road Glide Limited Base
2023 Harley-Davidson FLTRX Road Glide Base
2023 Harley-Davidson FLTRXS Road Glide Special Base
2023 Harley-Davidson FLTRXSE CVO Road Glide Base
2023 Harley-Davidson FLTRXST Road Glide ST Base
2023 Harley-Davidson FXBBS Street Bob 114 Base
2023 Harley-Davidson FXFBS Fat Bob 114 Base
2023 Harley-Davidson FXLRS Low Rider S 117 Base
2023 Harley-Davidson FXLRST Low Rider ST 117 Base
2023 Harley-Davidson FXST Softail Standard 107 Base
2024 Harley-Davidson FLHCS Heritage Classic 114 Base
2024 Harley-Davidson FLHRXS Road King Special Base
2024 Harley-Davidson FLHTCUTG Tri Glide Ultra Base
2024 Harley-Davidson FLHX Street Glide Base
2024 Harley-Davidson FLHXSE CVO Street Glide Base
2024 Harley-Davidson FLI Hydra-Glide Revival Base
2024 Harley-Davidson FLRT Freewheeler Base
2024 Harley-Davidson FLSB Sport Glide 107 Base
2024 Harley-Davidson FLTRK Road Glide Limited Base
2024 Harley-Davidson FLTRT Road Glide 3 Base
2024 Harley-Davidson FLTRX Road Glide Base
2024 Harley-Davidson FLTRXSE CVO Road Glide Base
2024 Harley-Davidson FXBBS Street Bob 114 Base
2024 Harley-Davidson FXBR Breakout 117 Base
2024 Harley-Davidson FXLRS Low Rider S 117 Base
2024 Harley-Davidson FXLRST Low Rider ST 117 Base
2024 Harley-Davidson FXST Softail Standard 107 Base
2025 Harley-Davidson FLFB Fat Boy 117 Base
2025 Harley-Davidson FLHRXS Road King Special Base
2025 Harley-Davidson FLHTCUTG Tri Glide Ultra Base
2025 Harley-Davidson FLHX Street Glide Base
2025 Harley-Davidson FLHXSE CVO Street Glide Base
2025 Harley-Davidson FLHXU Street Glide Ultra Base
2025 Harley-Davidson FLRT Freewheeler Base
2025 Harley-Davidson FLSTFI Fat Boy Gray Ghost Base
2025 Harley-Davidson FLTRT Road Glide 3 Base
2025 Harley-Davidson FLTRX Road Glide Base
2025 Harley-Davidson FLTRXRRSE CVO Road Glide RR Base
2025 Harley-Davidson FLTRXSE CVO Road Glide Base
2025 Harley-Davidson FLTRXSTSE CVO Road Glide ST Base
2025 Harley-Davidson FXBB Street Bob 117 Base
2025 Harley-Davidson FXBR Breakout 117 Base
2025 Harley-Davidson FXLRS Low Rider S 117 Base
2025 Harley-Davidson FXLRST Low Rider ST 117 Base
2026 Harley-Davidson FLFB Fat Boy 117 Base
2026 Harley-Davidson FLHC Heritage Classic 117 Base
2026 Harley-Davidson FLHX Street Glide Base
2026 Harley-Davidson FLHXSE CVO Street Glide Base
2026 Harley-Davidson FLTRT Road Glide 3 Base
2026 Harley-Davidson FLTRX Road Glide Base
2026 Harley-Davidson FLTRXSTSE CVO Road Glide ST Base
2026 Harley-Davidson FXBB Street Bob 117 Base
2026 Harley-Davidson FXBR Breakout 117 Base
2026 Harley-Davidson FXLRS Low Rider S 117 Base
2026 Harley-Davidson FXLRST Low Rider ST 117 Base