McCulloch Chain Saws

[Beetlejuice]

Got em both for $70. Compression feels good on both.. Haven't had a chance to get into em yet.. Still listening to my wife who just had to go along. Thattle teach herView attachment 648791 View attachment 648792 View attachment 648793 View attachment 648794

The 250 purrs like a kitten.. No chance to look at the 1-50 yet. Still waiting on my wife to purr.. Maybe tomorrow

 

[Jethro 2t sniffer]

Another question for you good fellows. Are all 54cc 10-10 cylinders the same?

 

[Jethro 2t sniffer]

Got the pm800 for 135nz

 

[rwoods]

Got the pm800 for 135nz

Great. Ron

 

[Beetlejuice]

The 1-50 has life.. Needs to be force fed for now, but got spark..dont know how long it sat, but chain was on backwards and upside down.

 

[Brian Thacker]

Ron and I were cutting today. We cleaned up a old Locust that Ron had fell a month or so ago. Here is a few pics of our day. This is Ron with his PM800.



Brian

 

[Darrin Cromwell]

I am trying to Identify my mac model no. 6000004 service no. 12-20970 to no avail. It's seems to be a mac 10-10, but those numbers don't exist anywhere I've looked. Will you help me post my question please?

Sent from my SM-T377V using Tapatalk

 

[JimM]

I am trying to Identify my mac model no. 6000004 service no. 12-20970 to no avail. It's seems to be a mac 10-10, but those numbers don't exist anywhere I've looked. Will you help me post my question please?

Sent from my SM-T377V using Tapatalk

10-10A
600004?

 

[Jethro 2t sniffer]

Ron and I were cutting today. We cleaned up a old Locust that Ron had fell a month or so ago. Here is a few pics of our day. This is Ron with his PM800.

View attachment 649154 View attachment 649155 View attachment 649156

Brian

Good to see one in the wild.

 

[Walter Glover]

In the quest for understanding figured some actual numbers for piston skirt leakage might clear things somewhat. Setup a rotameter to measure flow out the skirt/cylinder clearance. Just off bdc it started at 1.5 scfh with 7.5psi applied 30 degrees up it went to 2.7 and at 40 it was 3.2scfh. Last flow was 4.4 about a quarter inch before the intake opened. So those numbers meant next to zero to me at that point so needing a second 'opinion' I tore down my cp70. Applied the same pressure and swept the piston through the same range and got one reading of 1.2scfh no matter where i checked. That made it more obvious how bad the sp80 condition is. So might try the new piston if the fit measures ok. Here is a pic

 

[rocketnorton]

might explain few hard startin but good runnin saws.

 

[Walter Glover]

Another test for the tool kit for sure. Saw with good compression and good seals but ran like crap.
What I initially thought to be flooding was actually spitting g due to this poor skirt fit. Will retest tomorrow with a new piston.

 

[fossil]

I am trying to Identify my mac model no. 6000004 service no. 12-20970 to no avail. It's seems to be a mac 10-10, but those numbers don't exist anywhere I've looked. Will you help me post my question please?

Sent from my SM-T377V using Tapatalk

It's a 10-10A made from 12/67 to 2/70

 

[Walter Glover]

CP70L back together and fired up first pull. Runs and idles swell
Now more ripping into the SP80

Edit
SP80 piston skirt measures 2.050" and bore measures 2.062"
Chainswr aftermarket piston measures 2.060" so much better for sure!
Figured out some bits to pull piston pin, installed new bearings into piston then installed piston on rod. Had to use original pin as new one slides right in. Being all careful to get piston on right I got it wrong! Oh bother!
So pulling pin to switch it around
Fellas is there any OEM piston pins out there? What a cornball design somebody came up with eh!!
Continue on......

 

[Walter Glover]

I need help with how to get the rings into the cylinder? Old ones had a lot less spring to them and gave no trouble
Is there some dimensions or tips wrt an entrance sleeve or sumsuch?
At wits end on that one

Edit:
Mark came through for me again! Thank you sir.
Ring grooves not deep enough for the rings on these Chainswr pistons. Took the Dremel after the inside surface and removed 0.005" from the two rings. Lightly emery tobreak sharp edges and the piston slid right in. Very pleased
Assembled engine to try to pressure test and flow check piston. Could not get a number as it now leaks past the rings. So going to run it and maybe the rings will break in.

 

[Walter Glover]

Ring width reduced from 0.090" to 0.085"

 

[ML12]

^^ I had this exact same issue with my chainsawr piston. I also had to clearance the skirt because it smacked the counterweights on the crank.

 

[Walter Glover]

Sp80 is a runner!
All back together and now carb adjustments make sense. Idle stop screw is out about an eight of an inch from before. Mixture screws are pretty much 1 turn out.
Idles sweet and starts easy. Compression is pretty good considering the shape of the cylinder. Will try and get it into some wood this week to seat those rings
Thanks again to Mark and Tim your tips mean a lot!
Cheers

 

[fossil]

Sp80 is a runner!
All back together and now carb adjustments make sense. Idle stop screw is out about an eight of an inch from before. Mixture screws are pretty much 1 turn out.
Idles sweet and starts easy. Compression is pretty good considering the shape of the cylinder. Will try and get it into some wood this week to seat those rings
Thanks again to Mark and Tim your tips mean a lot!
Cheers

Good to hear it Walter. When you cut with that I think you will be impressed.

 

[Brian Thacker]

Out cutting today. I had to top a tree so I could cut it dawn. I had the PM6 out with me to top the tree with and the PM610 to fell the tree after topping it. Love the PM6. Nice and lite up in a tree. Cuts great for a 32cc saw. Thanks Ron.



Brian