McCulloch Chain Saws

[Duke Thieroff]

Hey this a question for the board and Mark. Saws like the 1-70 and Super 44A have the vane type governor on the carb, yet they are equipped with high performance type Kart motors. Is it OK to nix the vane, so that the saw can wind up like a modern saw? If I hold the vane and rev the saw, it sounds really good. Maybe the problem was the old style hard nose bars could not handle the chain speed, but nowadays you can retrofit a sprocket nose in there. Anyways, interested to hear opinions on the subject.

Let me know what you come up with if you do this.



Chris

 

[Ambull]

Let me know what you come up with if you do this.



Chris

I already have, and like Mark said, there is no instantaneous explosion. For sure the Kart racers would disable these as quick as they got them. It is really easy. One screw and the vane is off.

I would not recommend doing it on a gear drive saw, as the gear box probably would not hold up under high speeds.

 

[Duke Thieroff]

I already have, and like Mark said, there is no instantaneous explosion. For sure the Kart racers would disable these as quick as they got them. It is really easy. One screw and the vane is off.

I would not recommend doing it on a gear drive saw, as the gear box probably would not hold up under high speeds.

Certainly not on the 650, but the 1-76 or 1-70 may be candidates for it.

Question is do any further adjustments need to be made to the carb after the vane is removed?

This would have to lead to additional wear/tear on all moving parts involved, am I right?

Did you notice faster revving?

Higher revs without going lean?

Forgive me, I'm not totally up to speed as to what these do.



Chris

 

[promac850]

From what I've gathered, the air vane simply is a rev limiter so you don't blow the saw up holding the trigger WFO out of the cut.

If there is a load on the engine, WFO as long as it is tuned right, seems like there would be no problems running without the air vane governor.

 

[cpr]

My D44 is bypassed, it's no problem. The only thing you MUST watch for is how the throttle linkage attaches to the carb. There is no positive return on it, the governor is supposed to do that. If the carb throttle shaft blade slips past the throttle linkage rod, your saw's going WFO and you can't stop it unless you shut it off.

 

[Brian13]

Say I want to advance the timing on one of my ported macs, how far should I advance it? 5, 10, or even 15 degrees?

From what I have been reading, its basically trial and error. JJ would probably have a better answer. But I believe you get a base time, then advance it a couple of degrees, if you see improvement advance it a couple more until there are no more gains, and then move it back to last adjustment.

 

[Eccentric]

I have a Mac 1-10 with the bullfrog carb on it, can these saws be converted over to an SDC carb?


I don't have an SDC handy, or I would have checked to see if the impulse hole and bolt holes lined up.


Chris

You have an SDC handy to look at Chris. Just remove the one on that PM10-10 I sent you. Rebuild it with the K10-SDC kit I sent and reinstall with the mounting gasket in the kit.

I remember seeing an SDC carb 'conversion kit' for the bullfrog equipped X-10 saws on feebay a while ago. Had an SDC cab, an adapter of some sort, a fuel line, throttle linkage, and some other little bits that I can't remember. Guy showed a pic of the packaging with the McCulloch part number on it. I should have saved that listing......

 

[Duke Thieroff]

You have an SDC handy to look at Chris. Just remove the one on that PM10-10 I sent you. Rebuild it with the K10-SDC kit I sent and reinstall with the mounting gasket in the kit.

I remember seeing an SDC carb 'conversion kit' for the bullfrog equipped X-10 saws on feebay a while ago. Had an SDC cab, an adapter of some sort, a fuel line, throttle linkage, and some other little bits that I can't remember. Guy showed a pic of the packaging with the McCulloch part number on it. I should have saved that listing......

Hey Aaron, how the heck you doin?

I guess I should've phrased that better, I didn't have a loose SDC around today to mess with.

I would prefer not to tinker with that 10-10 you gave me because it's a good runner. I think I may salvage that bullfrog carb, if I can. It's a cool piece of history, and to get it right, if possible, I would have that much more knowledge.

I have that 1-76 spread all over the bench right now, so any major projects as of right now are on hold until we have a good runner in that department. I wonder what that's going to turn out like. Had to snag a new piston assembly for it.

That 650 turned out to be a heck of a runner man. It needs some minor stuff, but it really has some stones. I'm impressed. Wish I had a monster bar for it and some big wood to sink it into.

How's things out in the stick of NorCal?

Chris

 

[heimannm]

Aaron - I think those "kits" were really just replacements with new fuel lines, no adapters. At least the one I bought was just a replacement carburetor with fuel line...and some dried out lock tite of some sort.

Mark

 

[a. palmer jr.]

I always thought so, but never was able/had to do it too much.

I just converted my 650 gear drive over to an HL, which really wasn't a whole lot of trouble with some McCulloch 1-43 linkages.

I wish that HL had a choke butterfly in it though, because unlike the 1-43 the oiler is on the left and the primer button is on the right.

The oiler is pretty much stuck in the same position, the linkage is very tough to bend and would requite that a lot more parts of the saw be dismantled just to get it out to modify it.

I may either leave it the way it is and choke it by hand, or eventually find a carb with a butterfly in it.

Chris

I didn't say that it was always worth it, just that it can be done. Sometimes it helps to know a machinist too.

 

[Eccentric]

Aaron - I think those "kits" were really just replacements with new fuel lines, no adapters. At least the one I bought was just a replacement carburetor with fuel line...and some dried out lock tite of some sort.

Mark

Good to know Mark. I should have known you would have tried one of them out. Too bad it didn't have an adapter.

Hey Aaron, how the heck you doin?

I guess I should've phrased that better, I didn't have a loose SDC around today to mess with.

I would prefer not to tinker with that 10-10 you gave me because it's a good runner. I think I may salvage that bullfrog carb, if I can. It's a cool piece of history, and to get it right, if possible, I would have that much more knowledge.

I have that 1-76 spread all over the bench right now, so any major projects as of right now are on hold until we have a good runner in that department. I wonder what that's going to turn out like. Had to snag a new piston assembly for it.

That 650 turned out to be a heck of a runner man. It needs some minor stuff, but it really has some stones. I'm impressed. Wish I had a monster bar for it and some big wood to sink it into.

How's things out in the stick of NorCal?

Chris

Hangin' in there. We may be clear of the rains for a little while, thank God. I feel bad for all the folks getting flooded and blasted by the storms in other parts of the country. Had a terrible migraine all day today. Worst I've had in a long time. No fun. Haven't worked on anything McCulloch in a few weeks.

You have a source or two of parts near you that'll probably have the bullfrog diaphragms. I've seen more than a few on feebay recently too. Be sure to track down Mark's info on these funky carbs (in this thread or his Mac carbs thread). They don't adjust like a 'normal' carb. One of Mac's ideas that didn't quite fly...

 

[OREGONLOGGER]

Talked to a nice fella in yesterday he had two Mac Super Pro 125 on CL he said he has a barn full of old Mac's he couldn't count how many I told him to come to the PNW GTG and bring the farm He named off saws for 30 minutes he had in the barn:msp_w00t: I'm camping next to this guy

 

[a. palmer jr.]

Good to know Mark. I should have known you would have tried one of them out. Too bad it didn't have an adapter.



Hangin' in there. We may be clear of the rains for a little while, thank God. I feel bad for all the folks getting flooded and blasted by the storms in other parts of the country. Had a terrible migraine all day today. Worst I've had in a long time. No fun. Haven't worked on anything McCulloch in a few weeks.

You have a source or two of parts near you that'll probably have the bullfrog diaphragms. I've seen more than a few on feebay recently too. Be sure to track down Mark's info on these funky carbs (in this thread or his Mac carbs thread). They don't adjust like a 'normal' carb. One of Mac's ideas that didn't quite fly...

My wife wants me to put some saws on ebay because of all the tornadoes and such, that they might sell well. I'll probably still wait until Fall.

 

[Mr. Bow Saw]

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[Steve NW WI]

Nice slide show Mr Bow Saw.

Now I know that the bow that was on the auction last week went on a two man. I'll be danged!

 

[nallac]

PM700 # 2 pic,crappy cell pic.
Its a hell of alot cleaner than i hoped for,looks near new.
I have done a temp fix the pull cord,has nice spark
I'll need to get some new cord tomorrow for a proper fix
And mix up some gas, at what ratio?????.42/1?.


Also Picking up PM700 #1 tomorrow, should have a 26" b/c combo in good nick.

 

[RandyMac]

Ok Steve, you are danged.

 

[spiderhaze]

I got a 3516

A friend of mine gave me his 3516 thats been sitting in his garage for years, It started on 2nd pull with fresh gas now, it won't turn over sounds like spark plug. I will clean and try again

 

[heimannm]

Now Cliff, How am I supposed to get any work done if I keep looking at and thinking about all those beautiful McCulloch saws?

Thanks for the great slide show!

Mark

 

[barneyrb]

I have a 1-46 that is not stuck but low compression. If anyone wants it pay for shipping and it's yours. I hate to see one go in the trash if anyone can use parts or pieces.

Let me know....