Engine stalling under power
I saw a thread not long ago about the same problem but cant find it now.
I've got a 115hp yamaha V4 that runs absolutely perfect! However sometimes (never when cold) powering up the engine stuggles at about 1/4 throttle and then will either die or cough and be fine again.
ive also worked out that to overcome the problem when the engine struggles flick the electric choke on and it will suddenly pick up revs and be fine.
The engine runs perfect at WOT & tick over and once cruising its fine. its just the powering up stage getting the boat onto the plane & again it doesnt do it all the time.
Seems to me like fuel starvation? or dirty feul? anyone with any other ideas?