Hello! Yesterday I was flying my YS 91AC engine and when I landed the plane it sounds a little bit weird. I noticed that there was no muffler. When I checked in the pit area, the thread of the muffler stripped while flying. How could this possible happen???
I just oredered a new one from YS service and parts.
Great service YS!!!
Alejandro Albors

If the muffler comes loose while the engine is running, it will strip due to vibration.

Thanks. Next time I will use a little bit of locktite!
Keep flying,
Alejandro