I was trying to syncronise carbs and couldn't get it as good as I wanted. I took one apart and found the needle in the slide all pitted and corroded looking, the other three are allright. I can't find a needle and jet set for the K. O. 750 part number 16012-300-004 need help to finde a vender that sells the old stock. Any help woould be very much appricated. Scott in San Diego Ca.