I recenttly opened up the muffler on a new 066. Once I had removed the muffler I noticed a surprisingly poor matching of the exaust port, gasket and muffler. The gasket was missaligned and smaller than the port opening by about 3/32 on two sides and about a 1/16 of an inch on the top, the muffler was a bit off as well. Has any one else run ito this with Stihl or other saws?
I spent a bit of time with a file and dreml to match the gasket and muffler to the port, Im thinking I would have improved exaust flow, but wondered if the muffler restriction would nulify any gains. Not sure but I think it would only come to be a factor as the muffler opening was increased. I did open muffler up significantly.
Set the saw into some 18"-20" poplar, worked great before, works better now!
Maybe a good thing to check and correct alignment when doing a muffler mod.