Zx6r -99 engine noise and wont start? Help me
 

So got myself a little problem bought myself a zx6r that wont start if you dont push start it. But after you have driven it for about 15 min you can turn it off and it will start without any problems at all. And there is aswell a engine noise that comes and goes sometimes its more clicky and sometimes its more rattling or sweeping.

For the starting issue i have tried to clean the carbs 2-3 times and bought a repair kit for it aswell and it still wont start without push starting it. Any ideas?

And for the engine noise im planning on trying to take it apart in the winter (first time for me to disassembling an engine) if i dont get it back together i will have to buy another engine wich i have to do anyway if it blows next summer. So what could the engine noise be when it comes and goes? possibly a bearing or camchain?

It runs on all 4 cylinders.