6622 Electric Start ARC Billet Flywheel, Honda GX340/GX390 (3) SFI certified ARC Racing GX390 Electric Start Adjustable Flywheel for the Honda GX340 / GX390 / 420cc / 460cc engines. The ARC Billet Flywheels are CNC machined from 6061 T-6 Aluminum. It weighs 5.40... $265.00 Add to Cart The item has been added