got a 650 yesterday for the grand sum of $10. is missing top cover, shroud, and has ra muffler. were any 650's made w/this muffler? if not then I have a decent spare, and also need correct one... just throwin out a feeler for availability of these parts. saw rolls over w/ what feels like good comp, will check it over better today.
No the 650 never came with an RA muffler on it, the 650 was the last of the 600 series saws and used the same muffler as the 620, 620 Super