Yamaha Outboard HPDI Fuel Injector Driver Lot Of 2 60v-8591b-00 B5 Posted on June 20, 2023 by admin Yamaha Outboard HPDI Fuel Injector Driver Qty 2 60v-8591b-00 B5. Price is for both drivers. Came off of a running engine that loss compression on 1 cylinder.