My 2006 CRF450 is a pain to start the 1st time of the day. Jetting is stock, fuel screw is stock and engine only has 10 hours on it so no valve issues. Any ideas? Or any special starting procedures do the trick? Also a friend has a 2008 CRF250 and 2009 CRF 250 and they both are a pain to start also....all three bikes start fine when warm. We are in Atlanta 500-1000ft.