Yep, It's anywhere from a 1-43, 1-46, 1-51, 1-52, 1-53, 1-56 and another number or two like maybe 250. You can find the model on the block casing, Mark can tell you where if you do not already know.
Once you find the exact model you can do a sold search on flea bay to get a value or just do a regular search and see if any are for sale. If they say vintage Kart saw engine, some are modded to fit onto a go kart which seller use to described to up the price of the motor.
Very heavy saw and price of shipping sometimes cost more than price of the saw.
I've got 3 or 4 of them that I only use when I get a big log down and just lay the saw on top and hold the throttle down and let the weight of the saw do the cutting.
Some are really hard to start if they have been in storage and quite common for carb too need a kit.
A not desirable carb was the McCulloch carb and most have a tillotson carb HL type and you can go to the tillotson carb site to see the description.
Not a very desirable saw IMHO unless you are a Mac collector. Very heavy for the power to weight and usually have to have the throttle tied wide open for most to start after giving them a prime of gas and have the saw on the ground especially when the engine is cold. (and when they are running correct and the carb correctly adjusted they really sound good and like to make the 4 stroke sound.
Takes a real man to operate one of these type McCulloch's, no Nancy's or Pansies.
Here is couple of ebay links just to give you an idea of a 80CC 1-53
The first link is some for sale and the second link in next post is some
that have sold.
https://www.ebay.com/sch/i.html?_odkw=mcculloch+1-53&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.TRS0&_nkw=mcculloch+1-53&_sacat=0
