same thing happens when I ride up near Branch (east of Ludington) the cold air at 45-50, I have to go up 2 mains to get it to stop spitting on WOT.Also lower my clip one to fatten up the mids.
sorrry didn't read the above too well what size jets are in it and pilots your compression is good enough to start it.The problem by reading is that your not getting fuel at start up that would be between the pilots and the air screws, your getting fuel once its started. Poss a grain of sand caught and not coming out in one of the pilots.
My search has ended try to replace my left side exhaust and broke down and bought a new set so I have a right side fmf gold for someone who has a dent or scratch and wants a new right side pipe. 30 shipped in the 48 it is bright shiny chrome not dull nor scratched or dented.if you a want PM me.