Ray,

I have the same problem with Rossi 45, loading up at idle. You are milling the end of the spraybar from the carb barrel side? There is slot in the bottom of my spray bar, about 3/32 long, in the middle of the carb barrel, pointing down into the engine. When I open and close the throttle, rotating the barrel, the low speed needle opens and closes that slot. What does milling the end of spray bar do? Thanks. I just want to understand before I start removing brass.

Paul