RE: gp pt-19 and os 91 fx muffler problem
I have been told by O.S. support that you cannot remove the sleeve from the muffler, as it may overheat engine.
Jim @ Bisson said the inverted pitts muffler is in stock, and we can order it directly from him. My PT-19 arrived today, and I will decide on the muffler this weekend. I'll post my findings, if any.