Aaron Rybicki
ArboristSite Operative
Alright, success but not after the key smacked me directly in the eye.. saw must’ve heard me badmouthing..
McCulloch Chain Saws
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Alright, success but not after the key smacked me directly in the eye.. saw must’ve heard me badmouthing..
Aaron Rybicki
ArboristSite Operative
Went in, cleaned the points, and checked gap at TDC and it was around .027. I regapped to .019. Is .027 a big enough error to create no spark at all? It should be noted that the points barely looked like they were contacting before I regapped them.
Aaron Rybicki
ArboristSite Operative
I guess I’m stumped at this point.
- NOS coil assembly /plug wire
- Donor flywheel from a running 125
- Condenser tested good with multi meter
- Points cleaned with file, blown out with air, dry and gapped to .019
- Flywheel coil gapped with business card (never had an issue before with this method)
- Stop wire replaced
- Spark tested with (2) separate plugs
- Spark tested with stop wire disconnected
Had no spark before, still has no spark now. Not even a lick! Gotta be something glaring that I’m missing. Suggestions anyone?
- NOS coil assembly /plug wire
- Donor flywheel from a running 125
- Condenser tested good with multi meter
- Points cleaned with file, blown out with air, dry and gapped to .019
- Flywheel coil gapped with business card (never had an issue before with this method)
- Stop wire replaced
- Spark tested with (2) separate plugs
- Spark tested with stop wire disconnected
Had no spark before, still has no spark now. Not even a lick! Gotta be something glaring that I’m missing. Suggestions anyone?
You are looking at the 2/3 of the top ring and that was all there was. Anyone have a 2 ring set 2.5 inch x 1.5mm .
I found a sheet of original tar rope , guy at a saw shop had a box of nos stuff and I knew what the black goo strips were for.
For 15$ try a chip it'll a least eliminate the points and condenser from the mix, you can always take it back out when you done. My local saw shops keep the in stock also.
Spark plug could be bad(even new).
I went through the same thing with my 1-41, even got an nos coil . It was the points, they cleaned up nicely and were gapped correctly but would not fire the saw ,so I put new points in and it fired. I also got a condenser from a mini mac. In retrospect I should have just tried a chip to see what end to work from.
Brownthumb
ArboristSite Operative
Question Mac 10-10 A are the top and bottom rings the same.
Short answer, yes
Brownthumb
ArboristSite Operative
What’s the long answer?
I've come across a number of bad plug wires on MAC's. Three on my MAC's I think. It could be grounding out or not making a good contact at the coil. You might try changing the wire out if you have a spare. If not, either cover the wire in heat shrink tube or electrical tape.
Do check the screw where the points and condenser hook up to make sure that's not grounding out and make sure the armature (laminations) are grounded.
If that looks good, make sure the points assembly is not grounded.
Failing that, you may have a bad coil. No specs on those 125's but if you can find info on the other older large MAC's or other chainsaw coils and how to test them, the info can lead you in the right direction.
Agree with the main supervisor, try a chip. I would bet a lot of money that youll have spark with one. And i would also say its the points. I know its been mentioned that i like those chips, and for good reason. They are cheap and simple. No gapping and cleaning and setting. Yes i have saws with them and i have saws without them. Both will run well. I have great luck with chips.
Yeeeeeeeeeeeeeeeeeeeeeeesssssssssss. Lol
Try a known good condenser.You can't trust any readings from a muti-meter on a condenser.The condenser can test "good",but it could be leaking severely.I have a capitence tester here & it's basically useless.I send my used condensers to Bob J.& he has a Graham tester that loads up a coil or condenser as if it were on the saw.
Ed
Brownthumb
ArboristSite Operative
Thank you, I received rings from a on line seller that said fit 10-10a and they are actually 20 oversize.
and one ring is like a oil ring.
First time I got into one of these girls
I think we have a problem Huston.
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Aaron Rybicki
ArboristSite Operative
Thanks for all the help and suggestions guys. I got her running now... I tested spark by pulling the rope before I dug into it and there was definitely none. After all was said and done, I began to test spark using the low speed setting on a impact drill.. but going the wrong way. 
Big dumb moment on my part... After a few tests I had the realization and just like that I had spark haha. Kinda weak looking but it was enough to run the big girl. I definitely won't forget that one. Digging into this 125 has been a good learning experience and interesting to see the engineering differences/similarities between it and the 10 series line up.
Big dumb moment on my part... After a few tests I had the realization and just like that I had spark haha. Kinda weak looking but it was enough to run the big girl. I definitely won't forget that one. Digging into this 125 has been a good learning experience and interesting to see the engineering differences/similarities between it and the 10 series line up.
Aaron Rybicki
ArboristSite Operative
Here's the ol' cursed girl barking up!
That is one awesome sound right there!! Congrats.
As long as the rings are the right width, you can fix that end gap. With a file and patience, take a bit off the end and test. Repeat until the endgap is correct. Dont get in a hurry, you can take off but you cannot add it back on.
20 what? Those are way wrong and may not seat against the bore correctly even with the ends filed back. 62814 is the OEM ring set. Caber also makes a set.
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