A PM55 is 57cc at 1.8" and change. 1.74" would be a 54cc 10-10 variant. That said, the tag number is for a ProMac55., so there would appear to be a little mix and match involved.
McCulloch Chain Saws
- Thread starter Bruce Hopf
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Think I'd measure again. My guess is it'll be closer to 1.8 than 1.7.
Will try another method. Didn’t realize they were that close. Thought it jumped to 2”. Block not disassembled.
Use a swizzle stick (or similar) through the exhaust port to the opposite side of the cylinder and run the piston up against it from below to create a mark. Measure. Usually a fairly accurate method without having to remove the cylinder.
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Just learned a new trick with my tool normally used for changing discs on an angle grinder!
Same idea but used soft solder! Thanks
Marvin B. - To the best of my knowledge, the PM55, 555, 570, and 10-10S saws all used thick rings (I am thinking they are 0.043-0.044"?) but some were slightly longer for use with pistons without locating pins (89436) and some were a bit shorter for use with pistons equipped with locating pins (92517).
Bob - The actual bore diameter is 1-13/16" or 1.8125"
Mark
Bob - The actual bore diameter is 1-13/16" or 1.8125"
Mark
I’m guessing this is the bigger piston then which doesn’t bother me a whole lot.
any clues on what it might be? I’m thinking fuel tank/ trigger assembly has been swapped.
Also , and I posted this elsewhere but I don’t think folks are seeing it, I have had a pro Mac 700 for a while. Picked up a “ professional 700 Friday and wander what if any difference is besides appearance.
The only difference besides appearances that im aware of is that the intake spacer between the cylinder and carb box is thinner in the 70cc saws due to the slightly larger cylinder.
Of course carburetor options and throttle locks have had changes.
There is also a 60cc cylinder out there from the ProMac60 which could be an option.
http://www.acresinternet.com/cscc.n...ab2c4eb6cab868aa88256c2e0075f710?OpenDocument
I believe the only real differences between the two 700's are the color scheme and the type of fasteners used. The "Professional" will have some socket head type screws and the PM700 are slotted.
Mark
Mark
To be completely honest here,I never knew that Mac made a "Professional" 700.I knew the 10-10S was considered to be in the "Professional" line.Were there any other models that fell into this category?
Thank you kind sir. If it is half the saw of my other one I’m going to be plum giddy!!!!
McCulloch added that "The Professional" to a number of models including the PM365, PM655, PM10-10S, PM700, and PM805. They even tagged one one of the Mini Mac models(165) with The Professional label. There may have been others but those are the ones that come to mind right off the bat.
The Professional models normally had a black flywheel cover and black clutch cover and used more socket head or Torx drive screws.
Mark
The Professional models normally had a black flywheel cover and black clutch cover and used more socket head or Torx drive screws.
Mark
That promac 655 looks alot like the 610/650's I have atleast the tank and rear of saw
Interesting. I’ve seen some but not all of those. Thanks for the info. Working on the little 3516 that was in that bunch first as I don’t intend to keep it. Then I’ll move to the 700 and the 10-10. Lastly the mini 6. Kinda anxious to stick it on my tractor.
As do the pm155 and pm515 little mac saws. 
Learn something new every day! Have a great day sir!
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