Hi Wypipo
Is the bike new to you? I guess it is as it sounds like the first time you've opened the carb to see what's in there.
Before you start tuning the jetting, check the basics...
Clean air filter.
Check exhaust silencer is clear and not blocked (may sound daft but worth checking).
Check float height and operation of float valve.
Strip and clean carb, check all jets and orifices are clear.
All the best, Dave.
