I have a 1976 Mariner 20hp.Made by Yamaha;It's new to me,so maybe I'm wrong.When you crank it(pull-start)you have to have throddle almost wide open.It starts fine,but i was thinking it should crank at a much lower speed,maybe even idle?Could there be an adjustment needed,or does it sound like I need to have it tested by a pro.?thax for any help.dude11