I have a 1998 ZR500. Runs awesome but there are a few things that could use some work. #1- The clutch makes a rattling noise, very very faint when idling but as the throttle is pushed further it gets louder until about 6000 rpms. After that the noise stops. #2- Blue smoke from the exhaust 60% of the time when riding. #3- Speedometer doesn't work. #4- Sometimes between 5000 rpm and a little over 6000 rpm the engine lags slightly. Once its around 6000 rpm and above it doesn't lag at all. #5- Is it normal for the clutch to engage between 4000-4500 rpm? Or is this related to the previously mentioned clutch problem? Any and all help is greatly appreciated!!