Setting max rpm on predator 212cc box stock with governor intact

So my track Jackson speedway has a max rpm rule of 5,500 rpm max and no governor removal for box stock predator class, how to do i set max rpms
 
You can put the throttle rod spring in a different hole in the governor arm, changing spring tension. Seems to me making the spring stiffer allows more rpm. There are a lot of holes to choose from.
 
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