McCullough super pro 81

[bobdag]

New to me saw. Has spark and compression. Won't start. I put fuel down the intake and nothing. It's just a wall hanger but I want to hear it run!

 

[happysaws]

That saw is more than just a wall hanger... It will keep up with newer saws, and be way more fun to run.

 

[Brian72]

Nice saw! Get it running and feed it.

Sent from my E6782 using Tapatalk

 

[FamilyTradition]

Nice saw indeed. Full wrap, chain brake, nice cosmetic condition. Good luck with it! MT.

 

[ccarley]

Nice, congrats on the Mac.

When I picked up my PM610, it sure felt like it had compression too; however someone had straight gassed it in the past and the rings were stuck. Spark, fuel, and nothing. The view through the exhaust port told all.

I'm sure it's fixable. That will be a great saw when you get it running! Keep us posted.

Clay

 

[heimannm]

How much compression? They typically won't run below 110 PSI, make sure the compression release is able to close after a pop.

Very nice saws indeed and will hang with many modern high speed units, the 82 cc McCulloch saws have a lot of guts.



Mark

 

[bobdag]

How much compression? They typically won't run below 110 PSI, make sure the compression release is able to close after a pop.

Very nice saws indeed and will hang with many modern high speed units, the 82 cc McCulloch saws have a lot of guts.

View attachment 605951

Mark

Well I can hardly pull it over with the comp relief off. I'll put a tester on it later. Can you still get parts for these old girls?

 

[rwoods]

Most parts are no problem to find - complete older mufflers are rare and cost $50+. Many here would say that the older 82cc Macs such as yours have more umph than the more modern ones. I am have a weakness for the newer ones. Ron

Old picture - few more out of sight - PM 700 in middle:

 

[bobdag]

150psi without the carb on. Not to bad.

 

[heimannm]

Certainly should be enough to run.

Mark

 

[raumati01]

Do these take a 10-10 chainbrake or do they need a specific one?

 

[heimannm]

All of the 10 Series clutch covers are interchangeable. The only exception is the long clutch cover on the PM805/800/8200 type saws with the oversize mufflers, those have and extra "bump" in them to accommodate the muffler.

These will all interchange



The long cover for the PM models



The long cover for the PM805/800/8200 etc.



Some have a notch for the DSP / compression release



Mark

 

[raumati01]

Heimanmm , thanks for that.

 

[bobdag]

Would a cracked intake boot cause some of the non start issue? I haven't had a chance to work on it yet.

 

[heimannm]

If you put enough fuel straight down the carburetor or through the plug hole it should at least pop even with a torn boot, don't do it too much since it will run out of fuel and run lean at the end of every trial.

Mark

 

[bobdag]

If you put enough fuel straight down the carburetor or through the plug hole it should at least pop even with a torn boot, don't do it too much since it will run out of fuel and run lean at the end of every trial.

Mark

I put fuel in with a catheter down the carb. Not even a pop. Checked for spark. It's there. Pulled again nothing, more fuel down the carb, nothin. I'm leaning torwads a sheared flywheel key.

 

[happysaws]

I put fuel in with a catheter down the carb. Not even a pop. Checked for spark. It's there. Pulled again nothing, more fuel down the carb, nothin. I'm leaning torwads a sheared flywheel key.

Have you tried a different plug?
I've had plugs that produced spark, yet wouldn't let the saw run because the porcelain was cracked.

 

[bobdag]

Have you tried a different plug?
I've had plugs that produced spark, yet wouldn't let the saw run because the porcelain was cracked.

Ya. I put a new plug in when I checked for spark. Curiously the on off switch isn't working. It has spark in both positions.

 

[happysaws]

Ya. I put a new plug in when I checked for spark. Curiously the on off switch isn't working. It has spark in both positions.

Could be that the switch is dirty, or a wire is grounding somewhere...

 

[rwoods]

bobdag, I know less than most of the Macmen but I have experienced new plugs that will spark in open air but apparently don't under compression. I would try another plug. If you get the same results then your timing may be off. Or you don't have the priming down to the science. There has been many times I couldn't get a pop and I could not tell if I flooded it or didn't give it enough fuel. Usually before I fling the saw across the yard, I just do something else for a while and then come back and try again - most times that solves the too much too little fuel dilemma. Ron