I have the MVVS 45 and I'm having alot of trouble setting the low end. I usually put a pipe on the fuel inlet and blow while turning the low end needle little by little till some air comes out. this has always worked good but on the MVVS I ca't stop the air from flowing even with the needle all the way in. Is that the way their carb is designed or should I order a new needle valve assembly?

Thanks
Pat