go 40 pilot air fual scwer 1.5 out. idle speed screw 2.5 or three turns in from slide all the way down. back idle speed screw all the way out. keep your finger on the slide .then turn it in slow untill you feel the slide start to move them go in like 3 turns that's a good starting point .a lot of guys take the spring off the idle scwer to lean out a fat pilot.that how I got my bike so cheap.had a 55 idle speed screw all the way in. to lift the slide to let in more air.so I bot a five dollar scwer and put it on with the spring.would not run till I put a 45 in air screw was to 2.5 or 3 out.40 was better .