MCCULLOCH The official McCulloch thread

[Jusgunn3]

Well got her home and I do not think it’s a runner. Recoil is having some issues and it hasn’t ran in years. Should I start by tearing it down and rebuilding the carb? It has a rusty bar and chain so I need to clean them up for sure.

 

[Squareground3691]

Well got her home and I do not think it’s a runner. Recoil is having some issues and it hasn’t ran in years. Should I start by tearing it down and rebuilding the carb? It has a rusty bar and chain so I need to clean them up for sure.

Pull muffler, check piston and cylinder, can you pull it over at all, compression ?

 

[Jusgunn3]

Pull muffler, check piston and cylinder, can you pull it over at all, compression ?

Yes, I can pull it over and it seems to have good compression. Doesn’t fire but the recoil will not rewind so it’s a process haha. I have cleaned it up and use the compressor to blow it off and clean out the fuel tank. Put some fresh fuel in it and pulled it over maybe 10 times so far. I will throw a new plug in it but the current one [Champion] looks ok.

 

[Jusgunn3]

The fuel cap has a hole in it, thinking there is supposed to be a few components in it like the pro Mac 700 cap? Duck bill and an o ring is gone.

 

[the 28inch mac man]

The fuel cap has a hole in it, thinking there is supposed to be a few components in it like the pro Mac 700 cap? Duck bill and an o ring is gone.

No duck bill on my 440 which is the baby brother of the 797. The first thing I would do ,as squarground3691 said, is to take off the muffler and check things out. Also have you checked for spark? You might have to clean the points.

 

[heimannm]

There were (are) several different types of fuel caps on both the large frame and the 10 Series saws. Only a few early front tank large frame models had an internal vent and so used a non vented fuel cap. Some of the early vented caps did not have a duckbill valve but had a spring and disc built in for a vent. The greatest number of fuel caps did indeed have a duckbill valve and a sintered metal vent (capillary seal).

Mark

 

[heimannm]

Max the Mac Man (Knightmax over on AS) came to see me last week and brought some additions for the museum. Max on the left and his friend Alan on the right.



That's a PM8200 cut off saw with labels in Japanese, evidently that model was adapted for use by the Japanese McCulloch factory.





Mark

 

[heimannm]

He also brought me this PM650 cutaway.











It was a little rough when it arrived.

Mark

 

[heimannm]

We did our best to clean it up a bit on Saturday.





It was missing the oiler so I did my best at creating a cutaway.





It was also missing the clutch assembly so I did my best at creating a cutaway version of that as well.



Mark

 

[heimannm]

Hard to see the clutch when the saw is all together, but I know it is there...



It was also missing the fuel cap, so another attempt at a cutaway.



You have to remove the cap to see the "cutaway" of the duckbill valve installation.



The final step was to try and create some sort of cutaway to illustrate how the bar operates.



I miscalculated a bit while milling bar to reveal the bar groove and the core, but you get the idea.



Mark

 

[nbbt]

Tinkered on the PM 700 that I picked up a couple of weeks ago. Finished cleaning it, and went through it a bit more.
All I could find for issues were very minor. It needs a screw or two and a bolt/washer for the starter shaft, a new air filter(on order-&-needed one for a 10-10 so got a couple), clutch bearing (maybe), and likely a chain if it was to be used regularly. Current chain in in near race trim, haha.

Started and ran with just a few pulls from dry storage with no fuel in it. Seems to oil, at least with the push to oil button.

I had thought I was going to flip this one, now I'm thinking it will needs to have a couple of days of use before I make any hasty decisions. It seeming to be a snappy Mo Fu, at least without any available trees to murder.

 

[Jusgunn3]

No duck bill on my 440 which is the baby brother of the 797. The first thing I would do ,as squarground3691 said, is to take off the muffler and check things out. Also have you checked for spark? You might have to clean the points.

How do I clean the points on this thing?

 

[hacskaroly]

How do I clean the points on this thing?

Just like anything else on a chainsaw...hammers, whack it with hammers!!!

Here is a video of a guy working on /cleaning points on a MAC 10-10...should be similar enough to yours to get you started.

 

[FergusonTO35]

Just like anything else on a chainsaw...hammers, whack it with hammers!!!

Or cars, guns, houses, etc. If I can't fix it then I make sure nobody else can! B-)

 

[the 28inch mac man]

How do I clean the points on this thing?

You file the points and re-gap just like a briggs or any other engine. What carb is on that saw?

 

[Jusgunn3]

You file the points and re-gap just like a briggs or any other engine. What carb is on that saw?

Ok, thanks! I need to make something up to get the flywheel off. Here are some photos of the carb and saw, thank you for the help.

 

[Jusgunn3]

Carb

 

[hacskaroly]

Carb

Tillotson? I think that is what I have in my D44.

 

[Jusgunn3]

Tillotson? I think that is what I have in my D44.

I see a port number 539461 or maybe 539466 but I do not see a name on it.

 

[heimannm]

That is a MAC/Walbro "flatback" with a primer.

There are some threads with more information buried out there somewhere.

Mark