McCulloch Chain Saws

[Eccentric]

Hey - what kind of carb do I have here? I tore it down, cleaned and reassembled. Replaced the inlet welch plug after cleaning inside. The gaskets look good so I just reused. Any tips on initial settings? H/L 1.25/1? Thanks! Vic

I was talking with Bob Johnson before I left, Bob tells me he has the diaphragm and gasket kits for the flat back for $20 now. The needle is the same as the Walbro SDC.

Primers are a bit of a problem, I was fortunate to watch e-bay and get a few spares for the saws I like to have ready to go. For a GTG saw I don't mind having to give it a shot of prime to start.

Vic - that is a bit of an oddball that only appears on some of the D-30/36 and 1-40 saws. I think it is also a McCulloch by Walbro, the fuel pump diaphragms and gaskets are on e-bay quite a lot, Bill Robinson (Fayetteville Repair) and APSE have them as well. I have a few of them myself, but no spare metering diaphragms. In fact, I am not sure what the metering diaphragm looks like since I haven't had one apart in quite a while.

Mark Heimann

That looks like the early McCulloch/Walbro 'flatback' to me too. IIRC, somebody here was dealing with one a while ago and hooked up with Joe Salva regarding diaphragms/gaskets. If my memory is correct (don't put money on it), Joe is now producing the needed diaphragms/gaskets for these carbs. I go check his section on CSCF. BRB.....

Edit:

I searched the SCS section of CSCF (say that five times fast) for these diaphragms/gaskets. No luck. Mustn't be in production yet. Just the McCulloch 9 carb (later flatback). There was mention of upcoming 'bullfrog' carb kits (early 10-series saws for those that don't know). The last word (which was "coming soon!") was in 2009 however.....

Somewhere burried within the hundreds of pages of this thread are some discussion about those carbs. Gotta find it...

 

[a. palmer jr.]

I have a 1-40 saw which wouldn't start and I rebuilt the carb on it but don't remember what it had on it. What I do remember was the local mower shop had a kit in stock for it. It sure made a difference, starts up like a new saw. I'm probably wrong but seems like to me the carb was a Tillotson.

 

[Eccentric]

I have a 1-40 saw which wouldn't start and I rebuilt the carb on it but don't remember what it had on it. What I do remember was the local mower shop had a kit in stock for it. It sure made a difference, starts up like a new saw. I'm probably wrong but seems like to me the carb was a Tillotson.

The early direct drive Macs of that vintage had both Tillotson HL and 'early flatback' carbs. I think they installed whatever was handy....

 

[a. palmer jr.]

The early direct drive Macs of that vintage had both Tillotson HL and 'early flatback' carbs. I think they installed whatever was handy....

I remember when I bought the saw the fellow told me it needed the carb cleaned and a kit. I remember thinking, Oh no, not the dreaded flatback! When I got home I was surprised to find it was the Tilly, easy fix. I figured for $15 what the heck! I think I paid about $10 for the kit, so I didn't end up with too much in it.

 

[HeRoze]

That looks like the early McCulloch/Walbro 'flatback' to me too. IIRC, somebody here was dealing with one a while ago and hooked up with Joe Salva regarding diaphragms/gaskets. ====.

I am reusing the gaskets - they look good. But, Joe and I have been emailing a bit. He has this that looks right. I'm not sure about the one large diameter hole on the pump side though. Hope he doesn't mind me posting a pic.... credit for the pic goes to Joe Salva of Sugar Creek (to be clear)

View attachment 225752

 

[Eccentric]

Thanks for posting up Vic. I'm glad I wasn't imagining things!

The carb mounting gasket in that pic is interesting. It has impulse holes in both the HL and flatback locations. Cool. It's upside/down in the pic (the center tab hangs down when the gasket is mounted in the factory orientation). The HL impulse location is near the center and bottom (center and top in this pic.....and there are two holes so the gasket could be flipped). The actual impulse hole in the carb box flange is to the right of center.

The flatback impulse location is out to the side near the screw holes. Again, there are two holes so the gasket could be flipped. Actually, there are FOUR flatback impulse holes on that gasket, so a guy could mount the gasket upside/down with the tab sticking up instead of hangind down if he so chose when using that gasket with a flatback.

 

[Eccentric]

Hey - what kind of carb do I have here? I tore it down, cleaned and reassembled. Replaced the inlet welch plug after cleaning inside. The gaskets look good so I just reused. Any tips on initial settings? H/L 1.25/1? Thanks! Vic

Vic I'm borrowning your pics. The top pic shows the impulse passage cast into the face of flatback carbs. The end of that passage nearest the bottom/center is where the HL impulse passage is (and where the passage is on top-tank Macs). The end of that passage nearest the carb mounting bolt hole is where the flatback passage enters the carb on later flatback carbs. This is also the location for the impulse passage on the carb box flange on front-tank Macs. Interesting. The adaptors used on HL equipped front-tank Macs have a similar passage in them to mate front-tank Mac carb box mounting flanges to HL carbs.

 

[cpr]

I'd say you're on the right track. Here's the thread on the early faultbacks for the Super 44A/55A different from the Mac 6/9/48890b: http://www.arboristsite.com/chainsaw/167592.htm

 

[HeRoze]

===

If you can't find the parts you need, contact me in a few weeks when I am home again and I expect we can set you up.

Mark

you outta town again??? wow.

I think (hope) the gaskets that came out are good - they look fine and seem pliable!

 

[GrizzlyAdams86]

Is the correct amount of drive links on a 32" .404 chain for the Super 250 105 drive links?

 

[wendell]

Is the correct amount of drive links on a 32" .404 chain for the Super 250 105 drive links?

Having only 20 fingers and toes can be frustrating, can't it?

 

[Eccentric]

Having only 20 fingers and toes can be frustrating, can't it?

20? I've got 18 fingers and toes...
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plus two thumbs!

 

[wendell]

I didn't want to make it any more complicated for him.

Thanks a lot, Aaron! :msp_mad:





J/K Grizz!

 

[Eccentric]

That's my job Steve. Making things complicated since 1973....

 

[promac850]

I'd say you're on the right track. Here's the thread on the early faultbacks for the Super 44A/55A different from the Mac 6/9/48890b: http://www.arboristsite.com/chainsaw/167592.htm

Quote from that thread...

"No, not a bullfrog and not a flatback Mac carby. It is something else, but parts are out there. I've got a set of gaskets and diaphragms enroute for mine (Super 55A)

Chris B. "

So, considering it ain't a bullfrog, nor a flatback... I figure it could be called a roundback (more of roundsides, really)

That's more or less the seized up/corroded carb that came out of my S44A... looks pretty much the same. I'll have to check and take a pic of the bottom of that carb and post it here. A Tilly is going in place of that corroded Mac carb, when I do get around to the S44A.


Tomorrow... gotta put new u-joints on the rear drive shaft. Later in the spring, new leaf spring mounts and shackles, gas tank straps (one broke) and fuel gauge sending unit... gonna slap Herculiner into the bed then as well... maybe throw a cb in... this thing is a money pit. Inexplicably, I still like the truck...


:help: I've got Chainsaw Acquisition Disorder, Car and Truck Addiction Disease, String Trimmer Acquisition Disorder, Tool Acquisition Disorder, and Lawn/Garden Tractor and Lawn Mower Acquisition disorder... apparently Snowblower Acquisition Disorder will be next... neighbor just gave me another one yesterday... I've got four of the buggers around here... three run... two CCR2000's and two 2 stage throwers... one needs valve work or something, he did have it running not too long ago.

Something tells me it ain't ever gonna end...


Momma keeps saying that once my little shed out back gets full, no more stuff... suuure... most of it just shows up outta nowhere. Nothing wrong with that, and I ain't gonna scrap it or throw it out unless it really is scrap and I can't see myself ever finding a use for it. Might sell some of it. I'll build another shed if I need to... Maybe open a museum somewhere. I would be quite okay being the curator and CEO of the museum. Crazy thing is that I already have all kinds of old cool stuff that could go in it...


Slap me if I'm rambling too much. I probably deserve it...

 

[leeha]

That's my job Steve. Making things complicated since 1973....

Join my world. Everything i do is complicated.
Complicated since 1959.
Thats why i have no HAIR.




Lee

 

[wendell]

Join my world. Everything i do is complicated.
Complicated since 1959.
Thats why i have no HAIR.

Lee

So that's the reason? I'm bald because of Aaron. That bastard.

 

[Eccentric]

Here's lookin' at you buddy...

So that's the reason? I'm bald because of Aaron. That bastard.

Methinks you were bald before me Steve.

 

[8433jeff]

Its that wool Santa hat and the high speed ride that took the Wendells hair.

Cancer and a good cause got Aarons.

Now I need a haircut.

 

[Eccentric]

Its that wool Santa hat and the high speed ride that took the Wendells hair.

Cancer and a good cause got Aarons.

Now I need a haircut.

Buzz it Jeff. Join the 'cold head club'. I've buzzed mine again since that pic was taken. Truth be told................most of the top was gone before the buzz however....