Halfway through a ride last week my bike would backfire, and pop on deceleration. It is weird because it ran fine the first half of the day. I am thinking it is the fmf factory 4 silencer ( air might be leaking where the midpipe meets the header)but I have had the silencer on for about 3 months now and I think the sealant( silicone )might have burnt off where the pipe meets the silencer. I just cleaned the carb, adjusted the air screw and tightened the air boot where it meets the carb, other than that I dont know what else to look for. Could the valves need adjusted? I forgot to mention it was about 85 degrees and humid so I dont know how it would have gotten lean??