Just got this and been getting it ready to ride. Thing is it runs great at higher rpm but at idle it seams to be flooding out, and the idle is way to high. Put in new plug. checked everything including cleaning carb. The float in this one seems to be kinda wore.. someone removed the cap of the mixture screw. I have no idea of where to set it. With it on the engine I can’t figure how to get to it. Took it off and set the screw at 2 1/2 turns. Still runs rich at idle. from a good smooth run down to a high rpm idle and ruff running while sitting still. won’t idle down to normal rpm…staying about 2600 or so when sitting still or in neutral. Any idea of what I should do to fix this?