The McCulloch Chainsaw Thread

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sawfun

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I had two types of throttle rods. One has the screw hold down as in Marks picture and one does not, both are shaped differently.
 

fechtichmac

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roadrunner

sorry,no saw - but also one fine little machine
this one is a very low hour unit.
i have the same for at least 20 years-always working fine

E.

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exSW

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What is a ballpark area for a Super 250's compression? Mine is easy to crank and blows about 125 on my gauge. Starts,idles and revs fine. Don't have it in wood yet.
 

leec12

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Has anyone done a rebuild thread on this or similar saw. My comp is down to 100psi. I do have new rings and would also do the seals.

Thanks,

Lee
 

heimannm

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Lee - there have been some partial threads I started over on AS including D-30/36, 640, and a 795 I believe. All are pretty similar and would give some good advice.

The secret to the large frame McCulloch saws is using the puller to take the crankcase side cover off to allow you to removed the piston and connecting rod once you have the bottom end off and the cap & bearing off the lower end of the rod. In many ways the top tank saws (Super series) are easier to work on since you don't have to disassemble the fuel and oil tank to get to the bottom end of the crankcase.

DSCN0350.jpg

ex - The old reed valve saw will run pretty well down to 100 PSI or so, just don't have the oomph as a saw with higher compression. My better SP125 is around 155-160 PSI but I have heard reports of 180 on the large frame saws.

Mark
 

RandyMac

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Cut a lot of the Redwood, it was a 100 year old stand, the owner thinned the crap trees out 30 years prior, the rest were 36'' to 42'' diameter, well over 200' tall, the trees were only 5-6' apart.
 

fechtichmac

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air vane gouvernor saws

I had two types of throttle rods. One has the screw hold down as in Marks picture and one does not, both are shaped differently.

this still has the correct throttle rod -but the air vane removed
also the idle screw assb. broken off.
i think my s44still has the complete,working gouvernor assembly.
still searching for this super55 a usable p+c ,since this one is badly worn out... Thanks E.
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fechtichmac

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air vane gouvernor saws

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looks like yours does not have the correct carb. rod and carburetor have to fit.
there is no spring on the shaft , that holds the carb throttle in OPEN position
easiest way,to get it working , is using the other trottle rod , that pushes the carb lever in forward direction.
can be easyly self made using a piece weldig wire with the correct diameter
View attachment 33544View attachment 33543
E.
 
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Eccentric

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What is a ballpark area for a Super 250's compression? Mine is easy to crank and blows about 125 on my gauge. Starts,idles and revs fine. Don't have it in wood yet.

My 650 is at about 150psi. My S-250 is a tad over that IIRC. If my memory serves, McCulloch said to rebuild a saw when compression fell below 100psi. The rings on your saw looked a tad worn in the seller's pics, but still OK. 125psi sound about right for how the rings looked. I wouldn't worry about it. You could throw a set of rings in it to boost things up a bit. Don't think I'd bother with that for a while....
 
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