951carmine
New member
i have a 2007 90 hp 2 stroke 1b513442 outboard that has a misfire at idle that is worse when it is cold. it blows out a puff of smoke and some times stalls but runs pretty smooth at high rpm's when its warm it barely noticeable. i have owned the boat for 2 months so i dont know its history. i have changed 2 sets of plugs which come out black. i live on a small lake so 90% of the time that i am running it is between 1500-2500 rpm. i am very familiar with 2 stroke jet ski motors because i used to race the pro tour but this is my first outboard motor so i am not familiar with the common problems with outboards and any help would be appreciated.