Well I finally got outside and let my bike rip. I was very happy with it however I noticed an occational fairly healthy backfire on deceleration. I have done the BK mod and the ACV mod and everything else in the carb is stock. It ran very strong from bottom to top. It just has an occational backfire that I couldn't seem to get rid of with the fuel screw. It was fairly cold out when I rode and I know that leans it out some. So I guess my question is...Should I worry about it or should I just be happy with it? thanks in advance.