McCulloch Chain Saws

Arborist Forum

Help Support Arborist Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Mac 850 question. I was showing someone a picture of something on my phone and he saw a picture of my newly acquired yellow Mac. He asks me if I’m into Macs, and I said I really liked them. He then says he has two 850s, one runs good, other doesn’t but has good compression. Says he’d like $1k for both. I don’t need them, but thought they might keep me going on the collection. So, is that a fair price? Thanks.
 
Welcome McS55A. Your saw appears to have an H&S spike, a very nice addition. Personally I don't like painting a saw that has character, I've only had a paint two or three that were just too far gone to ignore. In all likelihood I will have to paint one or two of the 2 man saws I have awaiting attention since 90%+ of the original paint is gone or flaking off.

On your saw, the crankcase and the gear case (filled with gear oil) are only separated by a seal, if that seal is leaking it could be allowing oil from the gear case into the crankcase which would certainly lead to a lot of blue smoke.

Your saw is also equipped with an air vane governor, try forcing the throttle open at the carburetor (not with the throttle trigger) to see if that makes any difference. It is possible that the governor is closing the throttle when you are trying to run at high speeds.

I have a 55 (72cc version of the same saw) that runs very well.

McCulloch 55 2.jpg

Mark
 
Welcome McS55A. Your saw appears to have an H&S spike, a very nice addition. Personally I don't like painting a saw that has character, I've only had a paint two or three that were just too far gone to ignore. In all likelihood I will have to paint one or two of the 2 man saws I have awaiting attention since 90%+ of the original paint is gone or flaking off.

On your saw, the crankcase and the gear case (filled with gear oil) are only separated by a seal, if that seal is leaking it could be allowing oil from the gear case into the crankcase which would certainly lead to a lot of blue smoke.

Your saw is also equipped with an air vane governor, try forcing the throttle open at the carburetor (not with the throttle trigger) to see if that makes any difference. It is possible that the governor is closing the throttle when you are trying to run at high speeds.

I have a 55 (72cc version of the same saw) that runs very well.

View attachment 1176670

Mark
Thanks for the suggestions. I think I have tried bypassing the governor before, but I will definitely try again. For the gear case seal, it there a definitive test I can do to see if it is in fact the gear case leaking? Could I pressurize the gear case and spray soapy water and look for bubbles?

Thanks again,
Andrew
 
Yea id pass also. Thats a bit high for my pocket book right now. Ive paid more but things happen. I did get me a pro 10-10 automatic from a flea mkt yesterday. 13 bucks and it has great paint. If nothing else it has many many great parts. Well worth 13 dollars for a 10-10 that is complete and not busted up.
IMG_20240513_101626.jpg
 
Yea id pass also. Thats a bit high for my pocket book right now. Ive paid more but things happen. I did get me a pro 10-10 automatic from a flea mkt yesterday. 13 bucks and it has great paint. If nothing else it has many many great parts. Well worth 13 dollars for a 10-10 that is complete and not busted up.
View attachment 1177006
👍 That's a helluva deal on that 10-10,the bar & chain alone is worth that much,if not a little more.
 
I have an odd ask. Does anyone have an old stock photo of Lee Majors, '6 Million Dollar Man' actor, in a tin hard hat holding a McCulloch chainsaw? I believe it was an advertisement pamphlet years ago. I came across it online a while ago but now would like to use the image. Thx
 
I have an odd ask. Does anyone have an old stock photo of Lee Majors, '6 Million Dollar Man' actor, in a tin hard hat holding a McCulloch chainsaw? I believe it was an advertisement pamphlet years ago. I came across it online a while ago but now would like to use the image. Thx
Lee Majors Mac.jpeg
 
Hey just a quick question guys. What oil is recommended for the gear drive gear cases? Saws in question 650 and 640. Thanks in advance!
 

Attachments

  • 20200202_140424.jpg
    20200202_140424.jpg
    4.5 MB
Back
Top