I help a friend do his WR400 mods, throttle stop, exhaust cam timing and removed the baffle. The bike has sat for a year or two before the mods. Cleaned out the carburator. We live in the desert at 3000 ft elevation. 1) we have to really bump up the idle stop position to get it to idle (and it "seems" close to idle rpm) and 2) the header pipe will turn red just riding it up and down the block one time. The airbox cover is removed and it has an on-road conversion kit installed. We rechecked the cam positions with TDC and they both looked good, we check the throttle position sensor and it was good. The article for the cam mod said that stock jetting was fine for these mods, but with the header pipe turning red, I'm concerned somethings not right.