OK, I'm getting a little confused... I can't find a carb kit for this motor. Mercury Black Max 150 ser# 6455197. I think it is a 82-83 model. The Carbs have WH-27 stamped on them - maybe a (-1) on top carb. Can't see others. I've seen a lot of carb part #'s starting with WHM and numbers up to 25 then jumping to 28. Can anyone help?