MCCULLOCH The official McCulloch thread

[Al Smith]

I've only got one sleeved engine which is a Mac125 C .I made and fitted the cylinder using a Lisle precisian hone to factory specs using grade 50 cast iron .Which I might mention is the same alloy Harley Davidson used on iron cylinders . It's been so long ago I have forgotten exactly how the compression was on basically a new engine .Since then,maybe15 17 years I have not ran that saw enough to even seat in the piston rings .In this portion of Ohio it's seldom you find a tree large enough to put a load on that big old redwood slayer .Too danged heavy to cut fire wood with unless you are 25 years old which is half a century ago for me .This spring I hope to fire up all my 100 plus cc saws just to blow the cob webs out so to speak .

 

[Al Smith]

I do have an 805 Mac with an 850 cylinder I managed to cook just with a straight gasoline prime,my fault entirely .I think the cylinder might clean up and just need a piston .If so I have enough parts to built another 82 cc engine .Worst case would be a sleeve which I can aleady tell is much more complicated than a reed valve engine . I might add I kept the original 805 cylinder that the chrome failed .That engine was made during the situation when hard Rodesian chrome was in short supply .Which was also when the bumpers for GMC cars would rust off in about 4-5 years .

 

[Sloughfoot]

McCulloch sighting (I think). Can anyone identify this saw?

 

[Woodslasher]

Looks like one of the Italian Titans to me.

 

[Sloughfoot]

Looks like one of the Italian Titans to me.

Is that a Mac built in Italy?

 

[Woodslasher]

Is that a Mac built in Italy?

Yes sir

 

[heimannm]

This is a Titan 57, looks pretty close to the saw in the Whaler ad.





Mark

 

[Frognc97]

This is a walbro sdc
I’m trying to confirm if this is the correct layout of these diaphragms on this carb I opened it up to inspect possibly replace just want to confirm the order/ layout or if they’re is actually suppose to be 2 excluding gasket
Some of the markings are as follows
21-85
9-76
37a

 

[legdelimber]

A rule of thumb for carbs I didn't have a diagram for?
look at your diaphragms for the tabs/flaps and I'd go with the flaps touching the flat machined surface. The carb body here.
The gasket against the die cast cover that has the raised ridge line around the face.
Watch for any holes being blocked.

I'd wager that double stacked diaphragms would make it awfully hard to ever get the engine started, if at all.
Thinking that I'd leave out the tan one and try things. Maybe set the mix screws to about a turn and half out, for a starting point.

For what it's worth, I try to find the black rubber ones. To me those seem to make for the easiest starting. The textured ones seem to take a lot of fuel on them to make a seal and pump. I really don't care for the blue or black plastic (shiny) ones either.

 

[Rallyeguy]

This is a walbro sdc
I’m trying to confirm if this is the correct layout of these diaphragms on this carb I opened it up to inspect possibly replace just want to confirm the order/ layout or if they’re is actually suppose to be 2 excluding gasket
Some of the markings are as follows
21-85
9-76
37a

This is for your SDC 37A. Other models can use slightly different configurations.... I'll also post the complete IPL here if anyone wants to try to figure out other SDC models. it's just checking your model part numbers against the expanded diagram.... If you have two gaskets, the thicker fuel pump gasket (#22) is used with stamped steel cover, and the thinner gasket is used with cast aluminum cover.

 

[heimannm]

The flaps on the tan Teflon diaphragm provide some "back up" to the rubber flaps on the fuel pump diaphragm without introducing any restriction to the movement of the diaphragm itself.

Mark

 

[Squareground3691]