I dont know much about electrical stuff and electric starters in particular but I was wondering. Is it possible that Yamaha didnt get a starter with enough power to push the motor thru the compression stroke every time. When I used to use my starter (a long time ago) I would get that metalic clank that some are calling a backfire. I never thought it was a true backfire (I could be wrong). I just thought it was more of a kick back due to the starter just not having enough poop to get the piston thru the top of the compression stroke. This could also have a tie in with not enough battery power. Some posters said that if they had a real hot charge from a charger they never had a problem. Maybe we also need a starter with a few more windings and a battery with a little more umph. (I dont think umph is a very good technical electrical term but its the best I could do). Igor.