I am trying to make sense of what yall are doing but cant make my mind understand. Are yall drilling a hole in the black diphram piston on that top of the carb? On my 00 foreman the needle comes through the bottom of it and I believe there are 2 holes, one on each side. I guess it does, but how does drilling a hole improve a vaccum pressure? Can anyone take a picture of what they drilled?
If I could figure it out I think I will do it to help get my 27' vamps goin in addition to my new borejob and piston.