Tom,
My YS 1.10 was my first 4-stroke so I asked a lot of questions to all the Houston area
pattern flyers who have been flying YS engines for years and almost all of them said
the same thing , break it in flying on the airplane , don't run it much on the bench. Run
it rich for the first few tanks but break it in flying.
There is a lot of good YS information on Don Ramseys Barnstormers web site.
www.cox-internet.com/donramsey/

tommy s