YS 63 question

[Chuck Czarnik]

Quiet in here..

Tried to help a friend out at the field on Mon with a pair of YS63's on a twin.  Flew fine on the first flight several months ago, but both of them now will not hold idle when he pulled the plane back out this week.  They mostly run at 3000 up, just abruptly die below that.. Like fuel starvation.  If you punch the throttle hard, the engines would usually backfire and immediately die unless you ran quite rich.  Looks like he may have had a cooling issue on both engines (no cowl air other than valve cover).  Both engines doing exact same thing.  Possible heat damage?    Something ate both regulators?  I ran out of ideas.

Not a pattern plane, but there is a lot of YS knowledge on this list..  Any thoughts?
TIA, Chuck


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