I am just wondering what you guys have yor 39mm FCR's set at for you 400ex, and what mods you have. I have 416 JE piston 10.8:1 , XR400 cam, mild porting, stock head pipe, yoshimura race slip on, K&N filter with 10 1 inch holes in lid of air box, and FCR carb. Right now my carb has a 168 jet, and the pilot jet it came with, i don't know if this is normal or not but when its idling before its warmed up, i push the throttle quick to wide open and quad just dies, but once its warm this goes away. Does any body else's FCR do this?