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Try disconnecting the pedal linkage and see what happens. It just snaps off and on.
If this won't get it down, check all the external linkage on the carb and see if it is binding holding the throttle open.
Check if the primary and secondary plates are completely closed. If not, find out what is holding them open.
The only way it will run this high is if the throttle plates are open and the carb is getting gas from the nozzles.
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