Majortom, THANK YOU! I am having similar problems with my YS110. I would get 10 flights, then would have trouble transitioning from idle. My solution was to change plugs (OSF's) but obviously this was getting expensive. Dave ran out of advise unfortunately, but I'm going to try the 3 turn suggestion.

I'll also agree that when YS's are running they are powerful and sweet, but one does need to tune them a lot more than an OS or Saito.