i have a 1986 kawasaki kx125 it starts fine when cold and idles great, but as it runs for 1 -2 miniuts the idle slowly starts to increase all by itself, if you twist the throttle motor will rev up fine, but the longer it runs the higher the idle gets , if you shut it off for a while and restart it will again have a great idle but will again start to speed u by itself weather you touch the throttle of not