I have been reading about widing the upper venturi of the carb to a 12mm opening to get a little more power. If I disassemble the carb can I use a 15/32 (11.9 mm) drill bit to drill out the venturi? I do not have a 12mm drill bit and I believe this opening would be larger enough. Has anyone done the to there carb and if so how did it work?

Thanks