Sounds and looks real good Lee. Another nice addition to the family.
Mcculloch CP125 reborn
- Thread starter leeha
- Start date
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Thanks alot guys.
Still need to find a thing or two for it.
But it's very close to being completed.
Lee
Still need to find a thing or two for it.
But it's very close to being completed.
Lee
Dennis Cahoon
Addicted to ArboristSite
That baby's still way tight!......run a few more tanks through it, then lean'er down!
Brian13
Addicted to ArboristSite
Looks great!!! The paint really looks good
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Dang, I missed that part. Guess I need to watch it again. :hmm3grin2orange:
Awesome job, Lee. Thanks for sharing!!
Well, Back to the drawing board.
After i shot the video's i really wasn't impressed with this
saw. So last sunday i did some more cuts making some
different carb adjustments. At one point the muffler turned
red. Oh no, So i shut her down. Brought it in the shop. I
then pull the pull rope and it didn't sound good. I then pulled
the muffler and noticed very light scratches on the intake
side. So now what. I knew it just didn't seem to have the guts
like all the other 123cc Mac's i have run. So i tore it down. The
piston was on the verge of scuffing. But on the intake side only.
It had light scratches and the cylinder was fine. I cleaned the piston
with a scotch bright pad and gave the cylinder a light hone. Looked
everything over, measured the piston and cylinder. .004 to .0045 clearance.
Should be fine. Checked the one big reed, seals, gaskets and so on.
Didn't find anything that would have caused this to happen. So i
reassembled the saw very carefully and checked everything again.
Points set at .020. I got it running last night and on the floor it
sounds great. Idles nice, rev's up nice. I put it in wood today and made
quite a few cuts and have determined that this CP125 is the most
gutless 123cc Mac i have ever run. Something is very wrong. Almost
like the timing is off.
Will keep you all posted when i get time to dig into it again but for
now i'm burned out on this saw. need to let it sit for awhile.
Lee
After i shot the video's i really wasn't impressed with this
saw. So last sunday i did some more cuts making some
different carb adjustments. At one point the muffler turned
red. Oh no, So i shut her down. Brought it in the shop. I
then pull the pull rope and it didn't sound good. I then pulled
the muffler and noticed very light scratches on the intake
side. So now what. I knew it just didn't seem to have the guts
like all the other 123cc Mac's i have run. So i tore it down. The
piston was on the verge of scuffing. But on the intake side only.
It had light scratches and the cylinder was fine. I cleaned the piston
with a scotch bright pad and gave the cylinder a light hone. Looked
everything over, measured the piston and cylinder. .004 to .0045 clearance.
Should be fine. Checked the one big reed, seals, gaskets and so on.
Didn't find anything that would have caused this to happen. So i
reassembled the saw very carefully and checked everything again.
Points set at .020. I got it running last night and on the floor it
sounds great. Idles nice, rev's up nice. I put it in wood today and made
quite a few cuts and have determined that this CP125 is the most
gutless 123cc Mac i have ever run. Something is very wrong. Almost
like the timing is off.
Will keep you all posted when i get time to dig into it again but for
now i'm burned out on this saw. need to let it sit for awhile.
Lee
I feel for you Lee. I know how frustrating it can be when you put all that time into a saw and it still doesn't run right. I had a 795 that just never seemed to run right, and eventually I found a tiny little crack in the fuel line on the tank side. I had to put that saw down for awhile as well. Usually the best pick-me-ups are the large Homelites. 1050, 2100 etc. 90% of them just need fuel lines and a HL carb kit. Builds the self esteem a little, lol.
From reading this board, most of the people "who know" say that the CP125 runs stronger than the SP125. If that is true, something must be wrong. Perhaps it is the timing. I am not sure how compatible the flywheels are, but maybe it has the wrong flywheel on it. If the timing was really late, it might do the things that you are experiencing. Are you using the points or a chip?
From reading this board, most of the people "who know" say that the CP125 runs stronger than the SP125. If that is true, something must be wrong. Perhaps it is the timing. I am not sure how compatible the flywheels are, but maybe it has the wrong flywheel on it. If the timing was really late, it might do the things that you are experiencing. Are you using the points or a chip?
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Dennis Cahoon
Addicted to ArboristSite
Maybe you should buy those 4 boxes of 125 parts the Saw King has for sale Lee.
On second thought, if he selling those parts......they're Junk!.......Hahahahahahaha!
http://www.ebay.com/itm/1-McCulloch...612180722?pt=US_Chainsaws&hash=item1e6917b6f2
On second thought, if he selling those parts......they're Junk!.......Hahahahahahaha!
http://www.ebay.com/itm/1-McCulloch...612180722?pt=US_Chainsaws&hash=item1e6917b6f2
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Eccentric
Mister Wizard
My guess is that there's a casting flaw (such as a porus casting) or crack somewhere that's creating an air leak. Check the block (of course), intake manifold, crankcase stuffer, and crancase cover (flywheel side) Maybe a small crack or imperfection at one of the crank seal bores. Who knows.....
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What a bummer, Lee. Everything I would know you already know times 25. If the timing is late as suggested by Ambull maybe it has a standard 101 flywheel instead of the 5 degree advance flywheel that the 125s run. Hope you figure it out. Ron
cpr
Addicted to ArboristSite
5 deg. advance flywheels suck. More on that later, elsewhere...
I always have thought the 5 degree flywheels were standard on kart motors.
And saws had just the standard flywheel.
Clue me in Charles.
Lee
StihlyinEly
Addicted to ArboristSite
Lee, I have no doubt you'll figure it out. When it comes to AS, you are the 1 percent! And I mean that in the best possible way. And I'll tell you, that saw is lookin better than I'm sure it did coming off the shelf all those years ago. You, sir, are an artist! 
cpr
Addicted to ArboristSite
Trying the new 125c this afternoon and I think it has the advanced flywheel because it kicked the starter and tore my hand off FOUR times! Still hurts.
cpr
Addicted to ArboristSite
You know I haven't had the flywheel cover off yet to check, lol. When it came I looked at the cylinder, checked compression, fired it on a prime, and then it sat until today. I'm going to the shop later to look things over.
I have a 790 i bought a few years back and it did what yours is doing.
That saw would literally rip your fingers off. I investigated and found
it had one of thems chippy things in it. I took it out and redid the points
and all is good. Nice running and easy starting saw now.
This CP125 isn't doing any of that. It starts nice, Using the decomp of coarse.
And runs great on the floor. It will idle all day, rev up nice. Everything you
would expect. It just has no power and has a ton of compression.
Lee
cpr
Addicted to ArboristSite
Any chance the reeds are weak and losing charge as spitback? Might also explain the intake side scoring? Just thinkin' out loud...
There is no spitback what so ever. This saw
has one big single reed and it looked fine.
I just did a compression test and i only got 145
Maybe the rings need some run time to get seated,
But i would have thought it would have had more.
I check a SP125 and it pulled 175 max.
Lee
has one big single reed and it looked fine.
I just did a compression test and i only got 145
Maybe the rings need some run time to get seated,
But i would have thought it would have had more.
I check a SP125 and it pulled 175 max.
Lee
I think that for once I laughed as hard as you at your post!!!
