S&S Cycle 2017 M8 Models 4-3/8in Stroke Flywheel w/ Full Width Rods & Balancer Gear

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

Upgrade your Harley Davidson Milwaukee-Eight engine with the S&S Cycle 2017 flywheel, featuring a 4-3/8 inch stroke designed for high-performance applications. Crafted with precision and built for durability, this flywheel incorporates full width connecting rods that are heat-treated from 4140 steel, making them more than twice as strong as stock components. Utilizing Finite Element Analysis during its design process ensures that weak spots are eliminated, providing a robust foundation capable of handling increased power and higher RPMs for maximum performance.
The assembly is balanced specifically for S&S Performance pistons weighing 1213 grams, ensuring smooth operation and minimal vibration. This flywheel is perfectly suited for use with gear drive cams and includes a balanced gear installation for seamless integration. Its design also eliminates the need for crankpin welding, offering a more reliable and efficient setup that is ideal for high-performance engine builds. The 4-3/8 inch stroke allows for increased displacement, either 107 or 124 cubic inches, delivering more available power for demanding riding conditions.
Engineered for precision and longevity, the S&S Cycle flywheel is a critical component for builders aiming to enhance their engine's capability. It is compatible with various 2017 Harley Davidson models, including the Road King, Street Glide, and Ultra Classic, ensuring a versatile fit for your custom or performance build. Whether upgrading for increased power or improved durability, this flywheel provides the strength and precision necessary to push your Milwaukee-Eight engine to its limits.

Features:

• Designed for high-performance Milwaukee-Eight engines with a 4-3/8 inch stroke

• Full width connecting rods made from heat-treated 4140 steel for superior strength

• Finite Element Analysis optimized to eliminate weak spots

• Balanced for S&S Performance pistons weighing 1213 grams

• Includes a balanced gear for smooth operation

• Eliminates the need for crankpin welding for increased reliability

• Compatible with gear drive cams for enhanced performance

• Capable of higher RPMs, delivering more available power

Fitment:
Harley Davidson FLDE Deluxe 107 Base 2018
Harley Davidson FLDE Deluxe 107 Base 2019
Harley Davidson FLDE Deluxe 107 Base 2020
Harley Davidson FLFBS Fat Boy 114 Base 2018
Harley Davidson FLFBS Fat Boy 114 Base 2019
Harley Davidson FLFBS Fat Boy 114 Base 2020
Harley Davidson FLFBS Fat Boy 114 Base 2021
Harley Davidson FLHCS Heritage Classic 114 Base 2018
Harley Davidson FLHCS Heritage Classic 114 Base 2019
Harley Davidson FLHCS Heritage Classic 114 Base 2020
Harley Davidson FLHCS Heritage Classic 114 Base 2021
Harley Davidson FLHR Road King Base 2017
Harley Davidson FLHR Road King Base 2018
Harley Davidson FLHR Road King Base 2019
Harley Davidson FLHR Road King Base 2020
Harley Davidson FLHR Road King Base 2021
Harley Davidson FLHRXS Road King Special Base 2017
Harley Davidson FLHRXS Road King Special Base 2018
Harley Davidson FLHRXS Road King Special Base 2019
Harley Davidson FLHRXS Road King Special Base 2020
Harley Davidson FLHRXS Road King Special Base 2021
Harley Davidson FLHT Electra Glide Standard Base 2019
Harley Davidson FLHT Electra Glide Standard Base 2020
Harley Davidson FLHT Electra Glide Standard Base 2021
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 2017
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 2018
Harley Davidson FLHTCU Electra Glide Ultra Classic Base 2019
Harley Davidson FLHTCUTGSE CVO Tri Glide Base 2020
Harley Davidson FLHTCUTGSE CVO Tri Glide Base 2021
Harley Davidson FLHTK Ultra Limited Base 2017
Harley Davidson FLHTK Ultra Limited Base 2018
Harley Davidson FLHTK Ultra Limited Base 2019
Harley Davidson FLHTK Ultra Limited Base 2020
Harley Davidson FLHTK Ultra Limited Base 2021
Harley Davidson FLHTKL Ultra Limited Low Base 2017
Harley Davidson FLHTKL Ultra Limited Low Base 2018
Harley Davidson FLHTKL Ultra Limited Low Base 2019
Harley Davidson FLHTKSE CVO Limited Base 2017
Harley Davidson FLHTKSE CVO Limited Base 2018
Harley Davidson FLHTKSE CVO Limited Base 2019
Harley Davidson FLHTKSE CVO Limited Base 2020
Harley Davidson FLHTKSE CVO Limited Base 2021
Harley Davidson FLHX Street Glide Base 2017
Harley Davidson FLHX Street Glide Base 2018
Harley Davidson FLHX Street Glide Base 2019
Harley Davidson FLHX Street Glide Base 2020
Harley Davidson FLHX Street Glide Base 2021
Harley Davidson FLHXS Street Glide Special Base 2017
Harley Davidson FLHXS Street Glide Special Base 2018
Harley Davidson FLHXS Street Glide Special Base 2019
Harley Davidson FLHXS Street Glide Special Base 2020
Harley Davidson FLHXS Street Glide Special Base 2021
Harley Davidson FLHXSE CVO Street Glide Base 2017
Harley Davidson FLHXSE CVO Street Glide Base 2018
Harley Davidson FLHXSE CVO Street Glide Base 2019
Harley Davidson FLHXSE CVO Street Glide Base 2020
Harley Davidson FLHXSE CVO Street Glide Base 2021
Harley Davidson FLRT Freewheeler Base 2017
Harley Davidson FLRT Freewheeler Base 2018
Harley Davidson FLRT Freewheeler Base 2019
Harley Davidson FLRT Freewheeler Base 2020
Harley Davidson FLRT Freewheeler Base 2021
Harley Davidson FLTRK Road Glide Limited Base 2020
Harley Davidson FLTRK Road Glide Limited Base 2021
Harley Davidson FLTRU Road Glide Ultra Base 2017
Harley Davidson FLTRU Road Glide Ultra Base 2018
Harley Davidson FLTRU Road Glide Ultra Base 2019
Harley Davidson FLTRX Road Glide Base 2017
Harley Davidson FLTRX Road Glide Base 2018
Harley Davidson FLTRX Road Glide Base 2019
Harley Davidson FLTRX Road Glide Base 2020
Harley Davidson FLTRX Road Glide Base 2021
Harley Davidson FLTRXS Road Glide Special Base 2017
Harley Davidson FLTRXS Road Glide Special Base 2018
Harley Davidson FLTRXS Road Glide Special Base 2019
Harley Davidson FLTRXS Road Glide Special Base 2020
Harley Davidson FLTRXS Road Glide Special Base 2021
Harley Davidson FXBRS Breakout 114 Base 2018
Harley Davidson FXBRS Breakout 114 Base 2019
Harley Davidson FXBRS Breakout 114 Base 2020
Harley Davidson FXDRS FXDR 114 Base 2019
Harley Davidson FXDRS FXDR 114 Base 2020
Harley Davidson FXFBS Fat Bob 114 Base 2018
Harley Davidson FXFBS Fat Bob 114 Base 2019
Harley Davidson FXFBS Fat Bob 114 Base 2020
Harley Davidson FXFBS Fat Bob 114 Base 2021
Harley Davidson FXLRS Low Rider S 114 Base 2020