Trying to correct/improve the running of this mower. I bought it used and it surges. In checking old posts this seems to be a common issue with these 2 cycle engines. It was suggested the jets be inlarged, and or replace with jets from a toro. I am trying to find the toro jets to switch out but need a part number or the model of the toro mower. I can not find the wire drill bits to ream out the jets I currently have. Can anyone assist me?