it has to be the slide not closed like it should be. if it were just a vacuum leak the rpms could be high but not that high. The carb is allowing alot of fuel and air in.
Either the throttle linkage is messed up, or the slide isnt going all the way down.
With the filter or airbox off, look into the carb throat to see the slide...the gap at the bottom should be pretty small.
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