back to carb. troubles again. was running fine till a few days ago i had to put a new clutch kit in. it sat for 2 days without running while i waited for the clutch to be ordered. as soon as i got it back together i am back to the choke issue once again. runs smooth with full choke, remove choke the engine starts missing badly and occasionally backfires thru carb. and dies. also when it dies you can raise the hood and there will be a lot of moisture on the base of the carb. and even at times a thick frost. it has been in the 20's to low 30's here for the past few days any thoughts on what is going on. btw its a 250 with 1 brrl.