McCulloch Chain Saws

[Eccentric]

I am getting no 35A love at all tonight

I fiddled a lot more with it and after removing the main needle and pushing on the needle itself I feel it is hanging up when intially pushed which leads me to believe it might not be closing properly causing the flooding issue. At one point after reassembling the carb and trying to start it it idled for some time and after a couple throttle plips it flooded again to never run again.

Other concern is maybe the ball that seats with the metal tab over it is somehow the incorrect size? allowing to much fuel past it?

Where is Mark when you need him......seems to be MIA

I think Mark's in Panama or some other far away place right now. IIRC that carb doesn't use a needle/seat arrangement, but instead uses a ball and seat. Assuming your metering diaphragm is in good shape (and it may well not be), then you may have the wrong size ball. It may also be pitted and/or the seat could be damaged. The IPL states that the ball is supposed to be .125" in diameter.

i could start a little business here, my rate would be cheap but the shipping would increase the cost for you guys. seriously though, let me know i could help.

You would get as much business from us as you wanted.............and more. I have a few yellow saws, plus some red and green saws that could sure use some stripping and powdercoating. As I work my way though my projects, I'll be contacting you to see if you're wanting to take on any work at that time. Very generous of you to offer to help.:msp_thumbup:

 

[struggle]

I think Mark's in Panama or some other far away place right now. IIRC that carb doesn't use a needle/seat arrangement, but instead uses a ball and seat. Assuming your metering diaphragm is in good shape (and it may well not be), then you may have the wrong size ball. It may also be pitted and/or the seat could be damaged. The IPL states that the ball is supposed to be .125" in diameter.

The metering ball is a concern. I will measure it based off what you mentioned.

The main jet has a needle that comesout of it the the throttle rod pushed down to richen the fuel misture. WHne I intially push that needle down as it would when you pull the throttle it sticks which makes me think that it is not seating correctly.

What is frustrating is I am so close to gettign it to run but yet can't get it right. I am thinking of tabling it until the next GTG and maybe Mark can look at it. Based off the IPL I see some gaskets on the tank pump that are not there. There shows two on the diaphram but only the diaphram is there. Not the other one. But I don't think that is the problem as it only moves fule to the carb and it is getting that.

What is not happening is the fuel shutting off from the carb. This is a very funky carb set up to say the least:msp_confused:

It took me a little while to understand the operation of the lean/rich setting lever but I get it now as it really only comes into play at full throttle as from there you can adjust it to proper mixture. At this point that has not come into play.

 

[leeha]

Sweet SP81 Joey, You did a fine job.
Has some real snot too.


Nice video Struggle. The SP125 is a fun saw to run.




Lee

 

[Arrowhead]

I'm fixing a mini mac for a friend.... :bang:

I bought a MDC carb kit. Does anybody know the proper way to adjust the metering lever??

 

[8433jeff]

I'm fixing a mini mac for a friend.... :bang:

I bought a MDC carb kit. Does anybody know the proper way to adjust the metering lever??

I don't think it matters as long as the rest of the saw is in the garbage barrel with it. Give him one of the Wild Things.

 

[struggle]

I don't think it matters as long as the rest of the saw is in the garbage barrel with it. Give him one of the Wild Things.

After the time I spent on this Mac 35A I find working on mini-macs a breeze.

The 35A takes it to another new level of frustration:msp_mad:

 

[Eccentric]

After the time I spent on this Mac 35A I find working on mini-macs a breeze.

The 35A takes it to another new level of frustration:msp_mad:

Bah. The 33/35/39 saws are much easier to work on, so long as you have the needed parts.

 

[Warped5]

I'm fixing a mini mac for a friend.... :bang:

I bought a MDC carb kit. Does anybody know the proper way to adjust the metering lever??

Sure do! With plastic explosives in the middle of an empty field!

 

[struggle]

Bah. The 33/35/39 saws are much easier to work on, so long as you have the needed parts.

That I think is part of the problem. Apparently I am not the first person to have this saw apart.

From looking at the IPL I see things on there that I don't have, but wonder if it has more to do with running changes to the unit:msp_confused:

 

[Eccentric]

That I think is part of the problem. Apparently I am not the first person to have this saw apart.

From looking at the IPL I see things on there that I don't have, but wonder if it has more to do with running changes to the unit:msp_confused:

You have email Shane!

 

[ChainsawmanXX]

thanks Ron for the part! i got it blasted this evening and put one coat of paint on it. i'll get the painted pics up when the second coat is dry.

Iv been finding that popcorn on some of my parts.. even when I thought I had them all clean :bang:

Worked on the Sp81 alittle last night, installed the coil. And cleaned up some of the other parts.
Here it is before I installed the coil.

Waiting to get the intake spacer, before I go to much farther. Cant wait to get the saw running

 

[a. palmer jr.]

Iv been finding that popcorn on some of my parts.. even when I thought I had them all clean :bang:

Worked on the Sp81 alittle last night, installed the coil. And cleaned up some of the other parts.
Here it is before I installed the coil.

Waiting to get the intake spacer, before I go to much farther. Cant wait to get the saw running

I think if I ever send someone an item packed with popcorn I'd first put the item in a plastic bag.

 

[heimannm]

Home again.

Mrs. Heimann adjusted the setting on the modem while I was away and now I have no internet connection at home. Hopefully that can be resolved this week.

Otherwise I will pop in from time to time when I have a moment here in the office.

Shane, fuel is not supposed to come out of that hole, I think Eccentric is on to it with something going on with the ball and seat, good place to start anyway.

Did you find the instructions on the basic setting for the 33/35 carburetors? I know I have them somewhere if you don't have a copy.

I am going to be a while getting caught back up again...

Mark

 

[cpr]

You've got mail...

View attachment 222140

 

[heimannm]

Is that the "Easy Mac" drum with the fixed rim sprocket? I just picked up a couple more in .404/7T along with a few spare spline drums for for the 9/16" shaft like the SP105/125 etc. saws.

Looks like you have at least $225 in parts there if everthing is new. The round mufflers were $60 apiece the last time I bought a new one.

Mark

 

[cpr]

Thankfully, I didn't give quite that much for it. The seller had more mufflers and I probably should have bought the rest... not an easymac. Looks like it in the shrink-wrap. Standard spline hub with a 3/8 7pin. That will take a hike for the one on the left...

 

[heimannm]

You did well then Charles, you did well.

If you can find any more of the round mufflers NOS let me know.

I have a few of the rectangular ones for the 700/800 and SP styles saws but only one (maybe two) of the round ones. The third mounting screw seems to make them a bit more difficult to find.

Somewhere, maybe even back in this thread, I put together a string of photos of different mufflers and the way they mount, differences between the very early (3-27 /47) type saw vs. 33 / 35 type vs. the horizontal saws. The round ones seem to have a really nice tone.

Mark

 

[OldDeadWood]

Mark's Muffler Post

Next up, a 33/35 style welded muffler, only two mounting screws on this one.

And now the two screw 200/250 etc. style, two screws hold it together and two screws mount it to the block. These tended to be somewhat cheaper mufflers that are often very badly rusty or burned out.

The stack, work on virtually any saw if you have the right gasket.

And the winner is the three piece clamp style muffler with three mounting screws. This is the replacement part for the rectangular mufflers - part number 68240.

Mark

Here it is guys.

There's more on page 598

ODW

 

[OldDeadWood]

Mark's Muffler Post

I said a while back I would post a few photo's of different McCulloch mufflers. Let's get started.

First up, SP105/125. I don't know why but these mufflers and the mounts were completely different from everything else I encountered.

Here is the stock muffler on the saw. This one happens to be an SP105. Notice the very special screws that hold the muffer to the saw, large diameter and "hollow" with internal threads to hold the muffler cover in place.

The muffler and all three mounting screws lay in the same plane, and the gasket is a larger piece than you find on most.

Under the gasket you can see the configuration of the block to support the muffler and the gasket.

Here you can see that the older style mufflers would fit, but you'd lose the third attachment point unless you made a spacer. Of course then you would have to come up with some peculiar sort of gasket.

Finally, the SP style muffler disected

Mark

Oh what the heck.

ODW

 

[OldDeadWood]

Mark's Muffler Post

Here is a better shot of a 700/800 type rectangular muffler.

And a few views of some different blocks showing the muffler mounts. Not sure on this first one, may be a 200 with the closed center port. Notice the third hole tapped and ready for the extra support.

I think this one is a 1-40, no third hole support and a removeable head.

Mac15 block, closed center port again and the tapped third hole for support.

I think this is a 795 block since it has the DSP port.

Mark

A little more.

ODW