McCulloch Chain Saws

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I did take an 80 cc saw with me - a sightly used Echo CS-8000 of almost the same vintage as my PM800s. For those who like subjective hands-on comparisons - the Echo does not have the power or speed of the PM800 (Brian commented that the Echo sounded a little rich but I just ran it as it was). The Echo required more finesse to keep it in its happy zone which seemed narrower than the PM800's. The Echo felt sturdier to me but had more fine vibrations. Don't know whether it is the shape of the handle bar but the Echo seem to cut straighter than any of my MACs - I am always fighting a right side drift with my MACs and to a lesser extent with my Stihls. The other major difference I noted was fuel usage, the Echo cut at least 50% more than what I would have expected from my PM800s. The Echo holds 27.7 oz of fuel which is slightly more than the PM800 which holds 25.6 oz. Interesting to me to see that Echo recommends 25 to 1 versus MAC at 32 to 1.

I was cutting dead (read hard) 18 to 20" red oak which I don't cut that often so I will likely compare the two models side by side in the future for a better read.

Ron
 
I got to spend the afternoon with a legend in the mac world today. Drove up to a little town in north east Iowa and had the pleasure of Getting the grand tour from Mr Mark Hieman, aka hiemanm. We did some tinkering with my 250, scrounged some parts up for my 10-10s and put an oil tank gasket in my 700. I also managed to pry a couple sp80/81 parts saws from him to attempt putting 1 together. Sorry for the lack of pictures, but I was in a bit of sensory overload.
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Actually it was an SP81 and SP81E.

Mark
Lol, I gotta rember these things better. By the way, that 10-10 is in trouble. Pulled the plug and still bound up. Got drug out to the store so no more playtime for it tonight.

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@heimannm
On a 797:
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Old carb and possibly converting to
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HL63G
Could you possibly walk me thru the changeover or what is needed
Or photo of finished one

Thx in advance


Erik
 
I love the big saws , but have a soft spot for the little saw with heart . I bought a couple of these pipes off RC cars to try on some cheap saws . This saw was free and I think its perfect for the task . Anyone know what max stock rpm is ? Mini Mac 25 . A crisp 29cc ! Going to have to trim a couple fins around the exhaust port . It's super narrow now .

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Try to find a carburetor from another top tank saw so that stud isn't in the way. I think one of the numbers was 109.

Mark

Mark the carb # 103 is what was used on the early Super 797's and is a direct bolt in. Same as a 19
as long as it isn't the one used with the air vain governor. I have used the 63's many times but I cut
the threaded portion of that stud off.
 
So, this happened tonight, sp81 teardown. I think someone botched a re ring job, and someone has also done some goober welding on the lower wrap mount bosses. Anyone have a good piston and ring??? The jug looks great.
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Well I had some of the carburetor numbers right...

John - look at the top of the cylinder, if there is a letter "B" stamped, or no letter, Randy Duncan has NOS piston/rings/bearings for $50 with free shipping. That piston doesn't look so bad in the photos, what am I missing?

Mark
The piston in my eyes isn't bad at all. My main concern is all the welding in the back half of the case. Debating on taking the back half from the other saw and using it on this jug. Any pointers there? Also debating about swapping the electronic ignition onto this one. The coil with this one looks good but someone has butchered some of the plug wire. I'll check for that stamp this evening. I'm sure I'll be calling you
John

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Some ultra-fine lapping paper (20micron), a light touch and some patience should clean that piston up nicely. I'd probably replace the rings since the opportunity is there but they may also be ok. Check the end gap and see what you have. Seems to be quite a range of acceptable tolerances among folks. The closer the better, (obviously).
 
Should I just plan on crank seals also? The bearings look good, but someone has obviously been in here before. Lots of clear silicone all over.

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