My '97 gixxer has always had a light backfire on off throttle decelleration from high RPM. This problem was very pronounced at the T&T at Mission. It also sometimes has a slight missfire from 2-3k RPM. It's got 24000km and I run normal 87 pump gas. I put new plugs in (schedualled anyway) and it smoothed out slightly but it not perfect. It's due for a carb sinc and valve adjustment but I haven't done that yet (could that be it?) I've also noticed that off idle response isn't as good as some of the other gixxers I've seen. Would this be part of the problem? I can get a carb sinc tool and do that job for now but the valve job will have to wait until next season as money is getting very tight (I just got into the pharmacy program at UBC). I appreciate any and all feedback. Thank you.