If the carb throttle "butterfly" is "up side down" or backwards, it will definitely cause problems. High idle, mixture problems, and problems with throttling up. If yours was/is backwards, reverse it and try again.

Your bigger problem is that your connecting rod is now apparently worn out..... Install a new rod if the crank pin is undamaged, and run no less than 16% of good quality oil in your fuel. (160cc of oil per liter of gasoline)

AV8TOR