Thanks for the help guys- it is sincerely appreciated
An update: My son has got it running fairly well using the suggestions here, however, it smokes (white/gray color) a bit more than I remembered. He did a full carb cleaning (ultrasonic), cleaned out fuel tank, hose, and filter, and new spark plug. The carb diaphram "appeared " in surprisingly good condition (still pliable, with no holes) so did not try replacing it - yet. If memory serves me (less and less reliable every year) I purchased this new for a specific project back in the mid-1980's when I was a builder. It was used to cut large beams down to size before raising them up with a hoist on a home I was building in Palm Springs, CA. I bet the saw never saw more than 50 cuts, and was put back in its case and has been stored in my garage ever since. Accordingly, with such limited use, I would think that the saw would not even be close to being worn out (bore/rings) and should be able to provide service for years to come?
I finally did get a hold of Homelite customer service (telephone), and they told me that chainsaw was manufactured in 1981 (33 years old!). They did not have a operating manual or parts diagram for it, (nothing before 1984) and when they entered the UT # for THIS chainsaw, another UT # now comes up (UT 10578). She emailed me both the manual and parts diagram for THAT saw, and while it is somewhat similar, it is not the same saw.
To bgsengine- There is no letter after the UT 10656. Thank you for your help (as always) and I would welcome any documents you may be able to locate.
To KE4AVB - Yes, it is the "little red" all plastic case XL, however, NOT the "190"
To Kiss4aFrog- The link you provided actually brings up/defers to the UT10578 model which Homelite provided me.
To Skywatcher- Yes, working on it is "for our own interest" (actually my son's)
To Roym- Thank you, duly noted.
Regards,
Michael
Sidebar: I think that my son Jeff will be posting some photos of the saw later today or this evening.