McCulloch Chain Saws

[Warped5]

That's the beauty of this approach Randy, you can put the line on the fitting with the filter hanging down and just mount it to the tank. There is no need to replace the line when the tank is assembled, just open it up.

I don't have that one disassembled yet so I don't know the bore. I don't think it is a CP as it has the full shroud and no place for the AV mounts.

Makes me wonder if perhaps it was a kart engine? Did someone just add a compression release? The only similar model I have seen with location for that compression release is the 550 but neither of mine had the port machined out. Does anyone have a Super 550? Do they have a compression release?

??

Mark

My IPL shows no decomp valve and a quick eyeball of my Super 550 shows none as well.

 

[Eccentric]

I would bet they got their money's worth out of it.

If it's good for some parts I'm happy. I don't own a RH start cover yet.

He works for a masonry contractor and found this and a couple of cutoff saws, I can only imagine how beat they're going to be.

That saw looks like it will clean up better than one would think. Looks to have a 'protective layer' of mung. Also looks like it has the Walbro SDC instead of the bullfrog carb. The bullfrog saws don't have the external carb adjustment extensions in the side of the carb box.

I was messing with a few saws last night, getting ready for some firewood on Sunday.

Is it just me or is a sp81 (full wrap, no brake) lighter than a pm700 (half wrap, with brake)? I don't have a scale, but it sure felt that way. Maybe I was just feeling the effects of the Yellow Fever?

The long 'muffler guard' CB clutch covers add a lot of weight. I've noticed the same thing myself with my SP-81 and PM700.

Now fellow Mac heads, I need a little help identifying a block I found in the latest haul. Maybe I am missing something here but can anyone tell me which standard block (not the super series line 795/797) would have a compression release port and three hole exhaust? Note the back plate has the full shroud like the 200/300/400/500 model saws.

Any ideas?


Thanks,

Mark

As with you fellows, the only non super series large frame saw engines that I've seen with a boss for a DSP valve in that location (above the muffler) are the 550 and S-550............and the boss isn't machined. Interesting. Did you measure the bore yet? I once saw a picture of a front tank large frame Mac based blue Target demo saw. I should have grabbed the pic for later viewing, as I've never seen another one. Seen plenty of 795, 610, and 10-series based demo saw pics since. Maybe there was a 550/S-550 based machine that had a DSP valve...

I have a 795 based Target 14"-wheel machine coming to me in a trade too. Other than a busted starter cover (always pull the rope out when shutting off, or...) it looks to be complete, and has 150lbs of compression. I gave away my last 'spare' LH starter assembly months ago, so I'll need to scare up another cover. I don't need a machine that big, but am still looking forward to getting it.

 

[cpr]

Mark, I think that's a 795 block with a different side cover. I say that because of the decomp and 3rd port duct. A 797 would have boost ports, a late-model S797 or CP would have nothing back there.

EDIT: Now that I think about it, it's been so long since I was in my 795, I don't remember if it had a 3rd port either? I guess I have no idea, ha!

 

[heimannm]

Comparing with some photos I have on the computer I'd say that is a very good possibility Charles. I was mislead by the three hole exhaust but looking at some 795 blocks I have they do see to match up.

Interesting that someone would put it together with the other style cover, it would be nice to know what they were hoping to accomplish. If I have some time tomorrow I will see about getting the piston out and measuring the bore to confirm.

Thanks for the input.

Mark

 

[briantutt]

Thanks to Joey the Titan 50 is back to life!

Thanks Joey!

Brian

 

[cpr]

Well, call me intrigued. Pulled out the 795 and no 3rd port, no boost ports. I don't know what you've got....

 

[joeymt33]

I was looking for a SDC 38A for a SP81 today and I found this in my parts bin. It's a 51-A. No high or low needles. What Mac did this come on?

I checked the walbro website and had no luck. Also, while I was on the walbro website, I looked at the SDC 85 which is used in the DE80. It is described as having a governor. I guess one could put a 38-A in a DE80 and get a few more RPM?

Here I another thought, I looked at my two best running 82cc macs which is the PM800 and the PM850. Those two saws seems to have the best power and both are running Zama carbs. Just a coincidence?

 

[joeymt33]

Forgot the pic

 

[Arrowhead]

Is this the proper time line bar for the CP70? This is a nos bar I have, the one that came on it was similar, but had a bunch of paint wear.... not sure if it said Mac 10?

 

[heimannm]

Ed - Both the CP 70 and the yellow and black logo bar are early 70's so yes, that bar is period correct for the saw.

Mark

 

[heimannm]

Charles - I have a couple of 795 blocks in the attic, and comparing the two I'd they are the same thing.

Mark

 

[heimannm]

A couple more

Mark

 

[heimannm]

Hey Joey - That screw by your thumb is in fact the low speed adjustment. The idle speed screw is external against the wing on the throttle shaft. That carburetor will have a fixed high jet. I have two or three saws that I run with the fixed high speed jet and I like the way they work when I am cutting wood.

Mark

 

[Arrowhead]

Ed - Both the CP 70 and the yellow and black logo bar are early 70's so yes, that bar is period correct for the saw.

Mark

Thanks Mark. Does "Mac 10" basically mean the 10 series frame?

 

[cpr]

Hmmm. The plot thickens. On the block in question or the known 795, do the 3rd port passages actually lead to ports? Just curious and trying go learn.

 

[joeymt33]

Hey Joey - That screw by your thumb is in fact the low speed adjustment. The idle speed screw is external against the wing on the throttle shaft. That carburetor will have a fixed high jet. I have two or three saws that I run with the fixed high speed jet and I like the way they work when I am cutting wood.

Mark

Oh, I see. I thought it was the idle adjustment. Thanks.

 

[joeymt33]

Does anyone know where I can find the venturi size for the PM850 zama carb? It's a C2-M3A. I've been searching and can't find any info.

 

[Arrowhead]

A friend of mine found this in the back of a storage container, while doing some clean up at his yard. Looks like I'll have my first RH start Mac, this afternoon.

What model is it?

 

[ckelp]

super 10-10 i had one that had a problem disengaging the starter while i was pulling on it.. my shoulder still hurts
i did the worst thing i could do to that saw.. i gave it to aaron

Hey Joey - That screw by your thumb is in fact the low speed adjustment. The idle speed screw is external against the wing on the throttle shaft. That carburetor will have a fixed high jet. I have two or three saws that I run with the fixed high speed jet and I like the way they work when I am cutting wood.

Mark

do you use your saw to dig ditches too?

 

[Eccentric]

Dave that saw is a Super 2-10A. Looks like Tom's saw is similar, but not the same model. Tom's saw has a different kill switch (without the integrated throttle lock and DSP valve), and has the earlier AF cover and domed AF.