I have a '98 YZF that has been a wonderful bike for the last few years. I bought it used from a guy that rode in Nevada at ~4000ft. I put an FMF exhaust system on it and changed the jetting to the recommended settings given by the FMF technician. Everything was working fine until I recently learned that excessive compression braking and backfiring during deccelerating was due to improper needle position. So I removed the carb and looked at my needle clip position. It was in the second position and was supposed to be in position four (standard). So I moved it down to the standard position and tried it out. I struggled to get the bike started at first but thought nothing of it since I had just removed the carb and the fuel needed to get to the carb. Needless to say, I rode for about two hours and was able to start the bike with the kick starter only one time (and yes, I am an expert in starting this bike... I've learned). The only way I got it started was by bump starting it. From what I know, the needle setting affects the 1/4 to 3/4 throttle acceleration. This range was acting perfectly. Could this needle change have caused my starting problem? Or could it be a result of removing the carb and not setting the throttle cables perfectly? Anything? I'm at a loss. Thanks.