My '02 426 has just started blowing a little bit of blue smoke after I start it. It only blows the smoke when I blip the throttle but not when it is at idle. The bike runs great and once the bike warms up it disappears. The bike does not use oil that I can tell, but then again I change it about every 8 hrs. Valve guides/seals? If it were the rings then it would smoke all the time wouldn't it?