In about two weeks I will start breaking in my first TH 75 engine that I am installing in my US60

. I will follow the advice of heating the head with a heat gun prior the first start.
Now to the question is: Are you having problems with the silencer being loose, vibrating too much, spitting black stuff due to vibration, or even loosing the silencer during flight?
I met this pilot at our field and he is having all of the problems above. He even lost the carb barrel locking screw and the barrel came out of the carb during flight right after seeing something coming off of the plane (silencer).[X(]
Please advise and comment your break in experiences and recommendations.
Thanks
Pedro