google it and i am sure there will be someone that has done it.I would suspect its a restrictor in the carburetor. or actualy between the carb and the block. it could be the main juet in the carb is smaller too. you need the manual to find out the jet size.(or ask the local dealer what jets come in the parts list. if there is two different ones then you may be on a winner.)
old peterol head
December 2007