Mac Identification

[TPAC]

Good Morning,
I recently got a saw from my father that he picked up a the local flea market. I need help identifying the saw so I can hopefully find parts to rebuild the carburetor. From what I have seen and/or read here on this very cool forum, the saw appears to be a Mac 250 and the carb appears to be a Tillotson/HL. I am posting some pics of the saw and the carb if any of you kind souls would like to help me ID it and maybe turn me on to a good place to get a rebuild kit for it.
Thanks very much in advance for any help/insight you can offer.

A picture of the saw:

http://img122.exs.cx/my.php?loc=img122&image=macsaw17yy.jpg

A picture of the carb:

http://img10.exs.cx/my.php?loc=img10&image=carb0073jx.jpg

thanks again!

TPAC

 

[Lewis Brander]

Hello TPAC.

Hello TAPAC and welcome to the site. Try turning the saw over and looking on the crankcase for the model numbers stamped into the case. I'm no McCulloch expert but the carb looks to be a McCulloch carb instead of a Tillotson. I'm sure the McCulloch people here will jump in and give you their help. **** luck. Lewis.

 

[Ax-man]

That is a Mac carb, I just got a 1-53 with that same carb, or similar to it, compared it to my 300 which has a different carb, they are almost identical saws, except carbs are just different. It is going to fun to see if I can get this 1-53 running. The carb is impressive for a chain saw. My diaphrams are all dried out and strectched. Kits are rare from what I have heard.

Would a Tilly carb swap if you could change the linkage for a conventional choke as opposed to that 60's style primer??

I'm not a Mac expert either, some days I think I have lost my marbles looking at those old saws to buy. My shed isn't full of them yet

Larry

 

[Al Smith]

Mac primer carb

It looks like a 250,with a Mac primer type carb.The parts for these are rare as a hens tooth.Nobody that knows were to get them,will fess up. All I can tell you to do,is clean it up,as best you can,and try it out.More times,than not,the diaphragm will be puckered,causing the fuel lever to not allow shut off,at the end of the impulse cycle.I did a half fast[say that real fast] fix,by setting the fuel lever lower than normal,thus fixing the problem,at least temporally.

 

[TPAC]

Thanks Much!

Hello and thankyou to all those that have given input on my question(s). After looking closely at the carburetor and tearing it down, I think all I need is the needle seat (?) and possibly a diaphragm. I suppose these are the parts that are nearly non-existent? haha. If anyone out there knows how I can get ahold of some parts for this thing, please let me know. Thanks again for all the input, and by all means, don't stop now...I would like to hear anything that you experts have to say. Any advice (even if it's "throw the darned thing away") is greatly appreciated.

thanks so much!
TPAC

 

[heviarti]

that's not a 250, that's a 1 series saw, like a 1-43. the 250 had a carapace shaped air filter cover, where the 1 series has the dome with the ribs on the side. yes, that's a small throat mac flatback carb. At some point all us mac people need to get together and get some company to make those diaphragms for us.

 

[ozflea]

Making small amounts of items

Just experianced this very same thing with the Mc (duckbill valve) which became available again Elders Rubbers are producing a limited run of 2000 of these at $1-65 ea, my order is already in, but as regards diaphrams well there's still a need but who will order the first initial batch and where from as the Kart boy's organised the reed valve (duckbill) and i was lucky to stumble across this on their site and contacted Elders direct alas i bought 20.
The good part of this order is it is made from more appropriate material and won't swell as quickly like the origionals did.

We have work to do.

Bob Cornwell

 

[heviarti]

you mean diaphragms are available for this carb again?

http://www.acresinternet.com/cscc.n...18a6903168e698fe88256e1900118b70?OpenDocument

if they are I think we can probably scare some people up. Randy Duncan for instance, or maybe we can all collectively start a fund and make a bulk order with it.
maybe such a thing as everyone puts in however much they can (at least the price of one kit) and gets a return of as many or fewer kits than they paid for. then for all the kits they paid for and do not require, when someone not in the fund, or already fully paid by the fund needs another, they pay the fund, who then pays the first memeber in alphabetical order who isn't square with kits or cash back....

cgjunk on ebay keeps having those diaphragms, but the sucker won't answer my email. It's very difficult to gamble with a part you need.

 

[TPAC]

Saw ID

I have a question about the saws final ID. I took the advice given earlier and turned the saw over to examine the numbers stamped on the bottom of the crankcase. I am somewhat confused now. On the bottom of the saw there is a large "1" and just to the right of the "1" there is a "43" and then under the "43" there is a ""46". Can I assume that this is a model 1-43? Or is it a 1-46? I definitely have the carb ID'd as a MAC "flatback" carb prodced by Walbro. The picture that heviarti posted in this thread is indeed the carb that I have. One question about the carb. On the picture that was posted what is the proper name for part 12? I would call that the needle, but I am no carb expert. Will someone please enlighten me? And, also, isn't there supposed to be a seat for that "needle" to sit in? I don't see that listed on the parts chart. The "needle" that I have no longer has a rubber tip on it, and I assume this is essential to proper operation of the carburetor and thus the saw. Is this one of the parts that is next to impossible to find?
You folks have been awesomely wonderful with helping me learn about my saw.I suppose it's kinda like holding an infants hand and making sure he learns how to walk. I greatly appreciate your patience.

best regards,
TPAC

 

[Lawn Masters]

I've got a picture or two of a 1-42, since I own one, but that will only rule out the 1-42 model. a 1-43, I cant say what the top cover looks like, because I dont have one.
I can post the pictures of my saw if you'd like.

 

[Lewis Brander]

1-43 Pic.

Hello to all. I have an 1-43/46 saw. It has a Tillotson carb on it without any primer bulb. I'll post a pick. Lewis.

 

[ozflea]

Heviarti,
Old mate old buddy no not the diaphram but the rubber check valve the Karters got back into exsistance for the Mc BDC carby as these were non exsistant.

We just need to approach a manufacturer with an origional diaphram and see if they will fill an order of say 500 or more, sounds easy enough but whose going to start the ball rolling and who is going to cover the cost as they will proberly work out to be more expensive per unit.

Bob

 

[Lawn Masters]

Its a 1-46. http://www.acresinternet.com/cscc.n...e08ca34c5d97747f88256b00006b1c6f?OpenDocument

 

[Al Smith]

250 covers

It most likely is a 1-43,but the 250's also had that type of cover,on some of them.The enclosed pictures,show the 2 types of covers,that I know of.The one with the black cover,has that dang[for want to use a stronger word],Mac flatback.The yellow one has the good ole Tilly HL.Note the numbers,if you can read them,on the yellow covered saw.It says,200,below is 250 ,below that,in larger stamping,is 450.On the black covered one,it's just 250.

 

[Lawn Masters]

Al, I have a quick question you probably know the answer to, where is the tank vent on the fuel tank for these models? I dont want to tear it all apart just to find a vent.

 

[Al Smith]

Built into the cap.

 

[Lewis Brander]

Tank vent.

Oldsaw Addict: My tank vent on the 1-43 is in the gas cap, if that helps. Lewis.

 

[Lawn Masters]

Thanks, I didnt see one there but I'll look closer and see.

 

[Ax-man]

Count me in on this the carb kit for my 1-53.

Question?? How many different style of carbs are there for these old Macs. Mine doesn't quite look the same as the ones pictured , very similar but a little different.

Larry

 

[TPAC]

1-43/46 carb

Hey, mine doesn't look *exactly* like the one pictured either. Can anyone tell me where and if I can get a check valve, the rubber tipped one? I would appreciate it. This might just fix my saw up and make it run. I appreciate any input.

thanks!
TPAC