I left my idle jet alone on my 212cc predator. I did swap main jet and emulsion tube with a 0.37" main jet and a 140 emulsion tube. I put on a header and a KnN filter first. It sounds good and yes shoots a small blue flame. I left on the gov., because I can not find a billet flt wheel for it. Anyone know if they are out there? Do I need a different spark plug, what size? Thanks and let's make noise:smile: