19mm and yeah it can affect EVERYTHING. Float level is the first setting you need to make before worrying about jetting or any other carb adjustment. Don't frget to check it while it is on it's side.
hmm i was wondering the same.. i rejetted but never touched the float tab. simply bc idk how to. mine bogs on take off when its cold but when it warms up its fine idk if its jetting or the tab... i read the how to on adjusting it but im burnt i still don understand