I've had 3 GMS 47's they wear out fast
I have went thru 7 muffers, they break at the transition where the header & muffler join, not enought metal to put up with the vibration caused by poorly balanced cranks. And yes all my props & spinners are balanced. They don't shut off, the carbs jam up or fall apart.

AND the manual suggests the use of a 9x6, which I was never brave enough to try, so a 10x6 is not a problem.