I have an old Homelite EZ1 I think, I ran that thing once and oh boy is it loud... you can literally see the piston through the "muffler", probably like the above units, I've gotta get it to my place from my moms one of these days...
Newer 50cc poulan PR5020 was on the bench trouble shooting that got dropped off for a look. Needed carb kit to start and keep running.
Needs crankseals too once warmed up.
IMO not worth the $10 in seals for the plastic clamshell saws.
But some guys may do them just to learn on. If doing for yourself so labor is free.
I owned the older version in all yellow from new to test out to see 12 years ago. Was fine for cheap price point saw that ran 3/8" 20". Liked it better with 16".
IMO should have come with .325 like the version they sell overseas.
They did ad side tensioner to the newer one so thats nice.
Kind of reminds me of my Dad's old Lombard chainsaw...talk about an ear bleeder! What muffler?? At least all components of the saw were easy to get to! Photo taken probably 60 years ago.