I bought new seals for my sons 2012 CRF150F and cleaned the carb and jets. When I took it apart the bottom adjustable screw on the carb was all the way in seated tight. (I believe the bottom screw is the pilot or air mix screw, top one is larger and is idle adjustment)
I thought that the fuel mixture screw should be 1 1/2 turns out, but when I re-assembled the carb with the mixture screw out, the fuel leaks out the bottom of the carb as soon as I turned the fuel back on?? I thought it was maybe the float, but it isn't. Even with the carb apart and pouring gas into the float bowl alone, the fuel comes out the "overflow". Only way to stop the fuel from coming out was to keep the mixture screw all the way in.
the screw has a new o ring and I tired it with both the new and old o ring and same issue. Is this normal?
The bike is running well, but seems weird to me that there is no adjustment capabilities on an adjustable and accesable screw on a carb like this? Ideas?