Rpms

I have a 80 cc engine about three months old or so and suddenly now when I pop the clutch the engine revs up super hi and takes off with out me touching the throttle I have tried ever uh thing I can think of plus help
 
I have a 80 cc engine about three months old or so and suddenly now when I pop the clutch the engine revs up super hi and takes off with out me touching the throttle I have tried ever uh thing I can think of plus help

methinks you have to set the throttle idle stop screw to close the throttle butterfly at idle.
 
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