I think my evinrude starflite IV with selectric shift is an 1963. model 50931 serial 03651. 4000-5000 rpm. 75 hp. at 4500 rpm. V-4 stand up. my problem is, I think oil tipe. I can get it to idel good, but when i hit 1/4 throttel phut phut, die out, and fouled plugs. the people at mr o's keep...