im not familiar with the optical ignition system on your combo.theres a member on here who built one much like yours a while back ,search the posts for it,it may give you some insight into the issues you are having.screen name is lockjaw,havent seen any posts from him in awhile,but he was really helpful on the omc stuff. theres alot of really smart omc guys on here(not me,lol)that know these 60 deg motors really well,hopefully they will chime in.