YS 1.60

[Robert & Casey Green]

I had a strange issue today with my 160.  Went flying this monring -- operated just fine.  Went out again, transfered the engine to a different bird.  For the life of me the low end kept surging.  Trying turning the pump in figuring it was a little rich.  For 2 hours this continued without fail.  Engine will go bak to YS for inspection.  Has anyone else had this happen to them???
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