I have a 98 wr400 and have a few carb questions, first on the LH side of the carb there is a bypass valve or something that is between the hot start plunger and the intake - What really is it and what does it do? My 99YZ 400 does not have one. What is the starter jet for? Is it what controles the amount of fuel going through the enricher circuit when the knob is out? I have went through the carb a few times now and still have 6" flames that come out of the exhaust if I was to rev it up in neutral and then let off the throttle. It does not idle that great. I am running PJ 45 SJ 85 MJ 170 PAJ 75 MAJ 200 jet needle obdtm with the clip 3rd from the top fuel screw at 2 turns out I ride from 3000 to 6000 feet, the temp now is about 10 degrees C. I have the fmf powercore and the airbox lid is on the guy before me must have removed the throttle stop. I don't know if the grey wire is hooked up or not?? I have wr timing WHAT ELSE SHOULD I DO?