Mikey N.C.
Advanced Contributor
Have a 60 hp Yamaha. Runs great on muffs , replaced high pressure pump in vast chamber and filter, replaced gas in tank and lines from tank to engine new bulb. Boat in lake runs great for 100 yards then starts stumbling and dies. Crank engine back up and idles fine will idle all day. Full throttle about 100 yards and dies. Any ideas and how do you test crankshaft position sensor?