I have dual idf 40's on my trike. 1600cc stock motor. I had a flat spot right after shifting gears. It had 45 low speed jets and I went to 55's and it seemed to have straightened it up. I only rode it a short ride. I want to start over completely on tuning them and I have read several articles. I understand most everything except the air bleed screw. Some say it should be in all the way and some say it should be out from one half to one turn. I don't understand if it should be used in the tuning part. Some say it should be used by experience turners only which I am not. If anyone could shed any light on this I would appreciate it. Thanks