I want to bore out my stock carbs on my 400ex because I have heard a few poeple say it really helps but I am not quite sure what the specs are that they need to be bored to? Is it a straight bore or a taper bore? How many mm should I bore it to? I have some CNC equipment that I can use and I am a machinist by trade so I thought I would give it a try. Any info would be appreciated.