McCulloch Chain Saws

[fossil]

T

Not too many extra parts with this particular project but there are always a couple. Any idea where this bushing and extra bumper belong? Couldn't seem to find em in the IPL's. BTW, if I learned anything doing this rebuild it was don't remove the bottom plate nubbers/bumpers and expect them to go back in easily! What a hassle. My fingers still ache from two nights ago. But about these two rubber bits....
Something to do with the manual oiler maybe???

View attachment 562702​

Poge have a look at the attached IPL on page 18 of 25.

The bumper and the grommet go into the lower handle (brace)

The parts are number 33 for the bumper and likely 28 for the grommet.

The diagram calls for two (part 33) of the bumpers to limit travel I assume so there should be one in there already.
It looks like 28 goes up against the mount.
The position of the bumpers is a mystery according to the IPL.

 

[happysaws]

I don't know what saw the fuel tank/air box came from but every 82 cc saw that I have does have a hole in through the air box for the carburetor adjustments. I used the PM805 for this illustration since the black plug stands out so well against the yellow air box. You can also see the notch for the idle screw adjustment.

View attachment 562753

For the choke linkage, the bottom "choke rod" seems to look more like it. The shorter leg with the hook in it connects to an eyelet on the end of the choke knob. You do need to have the rubber snubber there to hold the choke in place.

View attachment 562754

I have a few spare tanks in the attic, let me look tonight to see if I have one with the hole for the carburetor adjustments and the notch for the idle adjust screw. Not sure you want to go backwards or wait for your current project. All of the SDC carburetors used on the 82 cc saws have the long adjuster screws with the boot you seen in the photo above sealing the hole in the air box. I have had a few where I needed to bend the tab on the throttle shaft to make the idle speed screw work properly.

I changed the carburetor on one of my SP125's to a fully adjustable SDC with the large bore, yes the original was in fact the smaller bore carburetor with a fixed H jet. Making adjustments is not easy, but I find I don't have to move them very much or very often. This one is just a GTG saw that I take along to Baraboo each year.

The original

View attachment 562757

The replacement, fortunately the throttle rod just travels enough to be the idle speed adjustment as well. I did have to add the hole and the fitting for the impulse but that worked out even better than I could have hoped. I stole a fitting from another carburetor I had laying around and pressed it into a hole I drilled in the cover over the fuel pump diaphragms.

View attachment 562758

Mark

What are the numbers on the fully adjustable big bore SDC carb? Thanks!

 

[heimannm]

The bumpers go here, but I think he knows that.



happy - there are several different SDC carburetors with the larger bore and adjustable H and L jets, 18, 19, 20, 22, 37, 38, 44, and 65. There are some differences between these carburetors as some have the tab on the throttle shaft for the external idle speed adjust, some have the internal idle speed adjust. Only the SDC20 has the external pulse fitting so you have to be prepared to add that to use any of the others on a CP125 or SP105/125.

 

[brandonstc6]

This probably isn't much help, my pro Mac 10-10 has the screws more angled since there isn't a hole in the air box. As Mark said, your saw should have the long screws. If you changed your carburetor or someone before you then that explains the short screws. Yours appear less angled than on this saw.
That doesn't explain the lack of a hole for the boot tho.

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[brandonstc6]

I am trying to find a 10-24 2 3/4" long screw for a Mcculloch chain tensioner. Has anyone bought one of these screws locally? I tried napa and tractor supply with no luck. What other store might have one? I could get one online but the shipping would be more than the item.

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[heimannm]

If you have a local Fastenal store, they may have one on the shelf. You will probably have to settle for a 3" screw and cut it down.

Mark

 

[brandonstc6]

If you have a local Fastenal store, they may have one on the shelf. You will probably have to settle for a 3" screw and cut it down.

Mark

I do have a fastenal locally. I forgot about them. I will see if they have one.
Thanks


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[emf123]

Mark what got me thinking is this, This covers 17 years. There are 1725 service bullitens. Do the math to see how many service bullitens were averaged per year. Staggering..

Hey Mark,
See if you have any service bulletins that cover the BP1. They should be around #1164 - #1258.
I've got SB sets that simply removed them, like the saw never existed. I bought my original BP1 service bulletins on ebay as a set of documentation. I've also never seen any documents that covered the recall.
Eric

 

[rwoods]

The SP81 is beginning to resemble an SP81 again. ...

And something certainly seems to be missing here...

View attachment 562703

...​

If memory serves me correct that is a bracket to hold the plug wire on the two piece electronic ignition. Seems that at one time I had a bottom brace with it and one without it. I got rid of all my SP81e parts except the old two piece ignition when I gave the saw away so I am just going by memory.

Ron

 

[rwoods]

I don't know what saw the fuel tank/air box came from but every 82 cc saw that I have does have a hole in through the air box for the carburetor adjustments. I used the PM805 for this illustration since the black plug stands out so well against the yellow air box. You can also see the notch for the idle screw adjustment.

...

Mark

Don't forget the DE80 tank. But of course his isn't a DE80 tank given the lack of the OP lever and the factory looking name tag rivets.

Ron

 

[Modifiedmark]

Hey Mark,
See if you have any service bulletins that cover the BP1. They should be around #1164 - #1258.
I've got SB sets that simply removed them, like the saw never existed. I bought my original BP1 service bulletins on ebay as a set of documentation. I've also never seen any documents that covered the recall.
Eric

I noticed a ton of BP-1 service bulletins, hard to believe there were that many for a one year only saw.

Are you sure the recall was actually in a service bulletin? I for one would like to see that myself. Seems everyone has there own story about how that went down and it seems to get more embelished each time its told.

 

[rwoods]

I am trying to find a 10-24 2 3/4" long screw for a Mcculloch chain tensioner. Has anyone bought one of these screws locally? I tried napa and tractor supply with no luck. What other store might have one? I could get one online but the shipping would be more than the item.

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All of the fully threaded screws I could find were soft and easily bent. I got hardened socket head screws from Fastenal and threaded them with a die. If you go that route I suggest that you also cut a slot in the head for a flat head screwdriver. The sockets pack with sawdust and can be a pain to clean out enough for a wrench. Ron

 

[brandonstc6]

All of the fully threaded screws I could find were soft and easily bent. I got hardened socket head screws from Fastenal and threaded them with a die. If you go that route I suggest that you also cut a slot in the head for a flat head screwdriver. The sockets pack with sawdust and can be a pain to clean out enough for a wrench. Ron

I cleaned up the old screw some and it seems to turn smoothly with the adjustment pin. I think the old one will be fine since I cleaned it up. I was just contemplating a new one if a good option locally was available. I think for now I am going to stick with the original adjuster. This is going a spare clutch cover anyway. I have a pm55 that I may use it on. I'm not sure yet.
Thanks


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[emf123]

I noticed a ton of BP-1 service bulletins, hard to believe there were that many for a one year only saw.

Are you sure the recall was actually in a service bulletin? I for one would like to see that myself. Seems everyone has there own story about how that went down and it seems to get more embelished each time its told.

Whoa, that's cool that you got them! It seems that in later years they didn't reprint any info on the BP1. Not in any newer service bulletins or microfiches that I have or seen on ebay either.
I have no idea what they sent our for a recall notice, I've never seen anything that documented how it went down.

 

[fechtichmac]

If memory serves me correct that is a bracket to hold the plug wire on the two piece electronic ignition. Seems that at one time I had a bottom brace with it and one without it. I got rid of all my SP81e parts except the old two piece ignition when I gave the saw away so I am just going by memory.

Ron

I think, this is for using on cp 70 , since there is a different lower av mount

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[Modifiedmark]

Whoa, that's cool that you got them! It seems that in later years they didn't reprint any info on the BP1. Not in any newer service bulletins or microfiches that I have or seen on ebay either.
I have no idea what they sent our for a recall notice, I've never seen anything that documented how it went down.

Nor have I. You would think that someone would have documentation on how that went down. If it was ever posted here or anywhere else, I don't recall it. Seems to be mostly theories now days and if someone did know and say the real story you still wouldn't know what to believe after hearing so many stories already.

Like I said, this binder full of stuff is interesting and eye opening to me, being a casual Mac observer.

 

[CM76]

I don't know what saw the fuel tank/air box came from but every 82 cc saw that I have does have a hole in through the air box for the carburetor adjustments. I used the PM805 for this illustration since the black plug stands out so well against the yellow air box. You can also see the notch for the idle screw adjustment.

View attachment 562753

For the choke linkage, the bottom "choke rod" seems to look more like it. The shorter leg with the hook in it connects to an eyelet on the end of the choke knob. You do need to have the rubber snubber there to hold the choke in place.

View attachment 562754

I have a few spare tanks in the attic, let me look tonight to see if I have one with the hole for the carburetor adjustments and the notch for the idle adjust screw. Not sure you want to go backwards or wait for your current project. All of the SDC carburetors used on the 82 cc saws have the long adjuster screws with the boot you seen in the photo above sealing the hole in the air box. I have had a few where I needed to bend the tab on the throttle shaft to make the idle speed screw work properly.

I changed the carburetor on one of my SP125's to a fully adjustable SDC with the large bore, yes the original was in fact the smaller bore carburetor with a fixed H jet. Making adjustments is not easy, but I find I don't have to move them very much or very often. This one is just a GTG saw that I take along to Baraboo each year.

The original

View attachment 562757

The replacement, fortunately the throttle rod just travels enough to be the idle speed adjustment as well. I did have to add the hole and the fitting for the impulse but that worked out even better than I could have hoped. I stole a fitting from another carburetor I had laying around and pressed it into a hole I drilled in the cover over the fuel pump diaphragms.

View attachment 562758

Mark

Did you relocate that ID tag on the 125C Mark? I've never seen one in this spot before. Nearly all of the 125C's that I come across in Australia do not have tags, however the later models which have the chainbrake do. The tags are always riveted in the normal spot at the front of the airbox. My 125's from the USA are almost always fitted with tags, and these are mounted in the usual spot at the front of the airbox as well.

Chris

 

[rwoods]

Makes more sense. At one time I thought I had figured it out but I can't now remember. The coil is tucked underneath on the two piece version and the plug wire is attached to something - maybe MAC repurposed the mount. I bet Mark has a CP and a SP that could answer the question. The IPL for both the SP70 and the SP81E show the bracket with nothing attaching to it. The SP81E shows two grommets and a 3/8" clip guide for the plug wire but doesn't show where they go.

Ron

 

[CM76]

You may need to inspect the air cleaner on the 10-10. There is alot of foreign material inside that airbox, and I dare say that a fair amount is getting into the engine.

 

[brandonstc6]

You may need to inspect the air cleaner on the 10-10. There is alot of foreign material inside that airbox, and I dare say that a fair amount is getting into the engine.

I haven't done too much with the saw. I just bought it Saturday. It seems to have compression. The air filter had a hole about 3/16" in diameter it in. I am hoping not too much damage has been done. I already have a new air filter for it. Would you recommend just cleaning everything good and running it? Or?
Thanks


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