This is waaaaaay out in left field, but since I'm grasping at straws I'll toss it in anyway. Could it be possible I'm letting the bike idle too long without moving and it's overheating? Pretty sure in the past I've idled longer without this problem but who knows. It's been anywhere from around 35-60 degrees in my garage so it's not exactly sweltering. Probably not but worth asking. Anyway today I try to determine if the floats/needles are working properly and go from there. Thanks to all that have taken the time to contribute so far.