I been having the devil trying to get this carb to stop flooding.I put a new kit in it, and the needle will not seat.Someone from this forum suggested it could be a different carb than what I bought the kit for.I went to shop evinrude and looked at every carb they had for this motor, and there was a small difference.This carb doesn't have the screw in the bottom of the bowl.It's very close but it may not be the original.It's a 1965 6hp Evinrude fisherman.The numbers on the float bowl are 310771 it has the letter m in a parallelagram ie square.with a circle around that.Where do I look to find out which carb this is? Can anyone help? Thanks