McCulloch 10-10 Auto - Running Problems

TomH

I was just given an old 10-10 by my grandfather. We had it running for about one minute earlier today then it died off. Had trouble starting it after that. Later in the day I tried starting it again and was able to, however it runs only for 5 seconds max before it dies again. We pulled the plug and I was able to shake what appeared to be carbon buildup out of the plug itself (the plug was brand new). I am wondering what route to take next, I have read about carb rebuilds, etc but not sure if that is my problem. It seems like the fuel supply is cutting out or something. Also on this saw, the pull start has about 3 to 4 inches of slack in it before pulling, like it is missing a wind? I will most likely start pulling it apart tommorow. Any suggestions on a course of action?

Bruce Hopf

There are a couple of things to look at. First, how strong is the spark. If you have a week spark, it would act that way, hard to start, and not stay running. Also, a plugged fuel line filter, could be the culprit as well.
If you have good spark, try putting a bit of gas/oil mix, down through the carburetor, and try starting the chain saw.
Once the chain saw starts to die, pull out the choke, and see if you can keep it running.
You might have to try and do this a couple of times, with the gas/oil mix in the carburetor, to get it running.
If no Ad val, you might have to go with a new carburetor repair kit, and go from there.
One other thing to look at, is the air gap, between the magnets of the flywheel, and the magneto, could be out of sink, and that will sure cause a very hard starting chain saw.
The air gap, between the magnets of the flywheel, and the two posts, of the magneto, is 0.010", to 0.012". I had the same problem with a couple of chain saws, that are in my signature below, that I had to adjust the air gap, and after that, I didn't have any more troubles.
Try these tips, and see how things work out for you, and if you need to get into a carburetor rebuild, I'll find a post that I started a while back on carburetor rebuilding, made easy.
Bruce.

__________________
McCulloch chain saws
1- Pro Mac 60, 1- Pro Mac 700, 2- Mac 10-10 Automatic's, 2- Mini Mac 30's, 2- Mac 110's,
2- Mini Mac 35's, 1- Mac 140 with Automatic Chain Sharpener,
1- Pro Mac 10-10, 1- Mac Cat, 2- Eager Beaver
2.0's, 1- Mac 1-10
Stihl chain saws
2- 044's, 2- 034's, 2- 024's, 1- 064, 1- 084,
Strunk chain saws
1- Busy Beaver, 1- SpeeDemon Special
Stand Back, I Have A Very Extreme Case of CAD (Chain Saw Addiction Disorder).

TomH

Right after I posted this I was going to take it apart. Before I did I decided I'd give it one last try. One pull with choke, one with no choke and it started right up. I didn't have the start position on the trigger either. Maybe it was flooded before? I have since taken it apart and cleaned it up a bit. I haven't messed with the carb. It is again hard to pull, may have flooded it again.