Flywheel - 4-1/4" - Big Twin

Flywheel - 4-1/4" - Big Twin

• Flywheels are CNC machined from heat-treated, closed die, steel forgings, and are stronger than cast iron or late style steel flywheels
• Replaces the original flywheels in S&S® 80" SH80 engines with alternator style crankcases for '70-'84 Big Twin
• Can be used to overhaul an S&S engine or to build a custom engine using similar crankcases and pistons
• Features 4-1/4" stroke, 8-1/2" diameter flywheels, and 7.440" connecting rods
• May also be used in 88" engines with 3-5/8" bore cylinders
• Made in the USA