I have the OS 75 and only ran about 3 or 4 tanks through. I installed it on a Extra 300S side ways. The problem I'm have is when I start it she runs really rich and slow like its losing power. I have it set at the required 2 to 2.5 turns as the manual says. When it runs I have a LOT of fuel coming from the exhaust. Any suguestion would really be appericated....Thanks