have probably 25-30 hours on my 06. The exhaust side seems to come loose often. I have already adjusted it twice. is this the same for everybody else? bike starts and runs great. Another thing is the top-end noise. The bike seems louder in the top-end than the few other 450s (none being suzukis) that I have heard run. The noise really only seems noticeable at idle. Has anybody else noticed this? Have checked clearance of valves and timing chain for tightness. I believe the suzukis may just be noisier.