Mac question

[ericjeeper]

local small engine shop has a couple of old macs.. I have not went and looked at em. Just spoke to the owner over breakfast. He says they have the old 93v motor in em.. whatever that means.. I am looking for a GTG toy. At acres nothing is mentioned about a 93v. is this guy nuts?

 

[PES+]

I don't know if he's nuts or not

But I am and will look in the national registry and see if he's listed.

Could he have meant 33B? I don't recall a 93V associated with any macs

 

[Scooterbum]

They do list one

Mc Culloch 90 series engines

Model....................Crank No...........Bore / Stroke...............Conrod No...............Size..........................Crank PTO type

MC5
1960.........................50756..............2.125/1.375.................55009..................4.9........................................1
MC6
1961.........................48744..............2.125/1.500..................55009..................5.3.......................................1
MC7
1962.........................48586..............2.165/1.635..................48905................6.05.......................................1
MC8
1963.........................48586b............2.165/1.635..................47782................6.05.......................................1
MC9
1964.........................48586c............2.165/1.635..................47903................6.05.......................................1
MC90
1966..........................48586c...........2.165/1.635..................47903................6.05.......................................1
MC91
1966..........................48586c............2.165/1.635..................47903...............6.05.......................................1

91A...........................48586c............2.165/1.635..................47903...............6.05.......................................1
1968
91B...........................48586c............2.165/1.635..................47903...............6.05.......................................1
1970
91B/1........................48586c............2.165/1.635...................47903...............6.05......................................1
1970
91C............................48586c...........2.165/1.635...................47903..............6.05.......................................1
1972
91M/C........................89140............2.165/1.635...................47903...............6.05...............Straight grove and key
1973
MC92.........................91085............2.165/1.635...................47903...............6.05......................................2
1974
MC93.........................91085a..........2.165/1.635...................47903...............6.05......................................2
1977

By the way that's a Kart engine,I don't know if Mac ever fit one to a chain saw like they did the 125.

 

[PES+]

I remember a 91B but not a 93B but I was already running the 101s by that time so maybe there was a 93B though the 93 came out about the end of the kart engine production.

So an eyeball inspection is the way to tell which he has.

The shape will tell all.

 

[ericjeeper]

what will the shape tell?

I know nothing about old Macs. I just wanted a decent runner for gtgs

 

[Al Smith]

I know nothing about old Macs. I just wanted a decent runner for gtgs

A 90 series Mac kart engine has plenty of go in it.If those things are in decent shape for a decent price I know one old farm boy in Ohio that could take a few if they are too much hastle.

I think I can find that part of Indiana again .:hmm3grin2orange:

 

[PES+]

The 90 kart motors were 100 CC class (99 actual standard bore)

Not too many 99 CC chainsaws and most if not all of them were gear drives if I remember right....I am missing a few of my Mac books

 

[ericjeeper]

I am going there in a few

I will write down model numbers and report back. Thanks

 

[ericjeeper]

well wasted trip

Two old beaters, missing parts, no model numbers to be found..(without scraping off the last 100 years of goo.) So I told him I was looking for something a little more complete.

 

[Al Smith]

Not too many 99 CC chainsaws and most if not all of them were gear drives if I remember right....I am missing a few of my Mac books

I think the model 550 is one of the 99 cc models .

 

[gatkeper1]

I think the model 550 is one of the 99 cc models .

Yup 550.S550,740
I would have taken them just for the parts value unless he thought what he had was gold

 

[ericjeeper]

well they were built like the 550

except the air filter cover was shorter.Fuel tank was on top, or oil tank one.. Filler cap was slightly behind the top handle.But they were missing screws, and bars and chains.,
The engine was in that layout. cylinder was to the rear.

 

[Scooterbum]

Look like this?

 

[Al Smith]

Well , the super 550 is an RCH bigger than 99 cc's.The 550 is a 2.165 bore by 1.635 stroke.The super is 2.217 bore by 1.635 stroke giving it 6.3 cubic inchs ,instead of 6.03 of the 550,if I read my micros correctly .

What,if any of the parts interchange between the 90 series kart engines and these,I have no idea.How some ever,Mac being Mac,any thing is possible.

 

[ericjeeper]

No the recoils are on the left.

and which ever tank is on the top. it has a smaller fill hole.

 

[thomas72]

You may be looking at a G-70 or Lg-6. Some of these models can have a left side starter. I have seen some lg-6 saws with the starter on both sides of the saw.

 

[Scooterbum]

Check this site

http://www.acresinternet.com/cscc.nsf/GasbyManufacturer?OpenView

See if you see it.