Please check the carb and clean the jet and various nozzles as it seems that there is not enough fuel reaching the engine. May be the fuel filter is clogged. If so, then it needs replacement. Do that.
It might be that you have a clogged vacuum line. Had one do this to me. It would start and run til it got to about 3000 rpms. Then it would not take anymore throttle. Vacuum line had a dirt dopper nest built in it. Cleaned it out instantly ran like it should. It wouldn't let the diaphragms in the carbs open.
IT MIGHT BE THE SPARK PLUG, THE CARBURETOR OR THE CDI ACTING UP.
REGARDS.
PLZ. DON'T FORGET TO RATE
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