Mac 740 99cc

[Trent Curtis]

anybody run one of these toads? I’ve had this in my overflow saw trailer- loads of compression but needs carb gone through etc. do they run with the torque to justify the boat anchor like weight?

 

[leeha]

They actually run very well when tuned properly, They are not hi revers but have plenty of torque.

 

[Jethro 2t sniffer]

I don't have 1 or ever ran 1 but can assure you the torque will be incredible and absolutely worth getting it running. Will make that bar seem short.

If you have a big log to cut up there is not very many machines better from then or now.

 

[Trent Curtis]

I don't have 1 or ever ran 1 but can assure you the torque will be incredible and absolutely worth getting it running. Will make that bar seem short.

If you have a big log to cut up there is not very many machines better from then or now.

long as I don’t have to carry the saw to the log..... may be easier to carry the log to the saw

 

[Jethro 2t sniffer]

long as I don’t have to carry the saw to the log..... may be easier to carry the log to the saw

Haha character building fun

 

[SEAM]

50 years ago it was a state-of-the-art marvel... and it probably will do marvelous things even now after a little tinkering. A little on the heavy side, though, but I like my 795. They look and feel heavier than they actually are.

 

[Trent Curtis]

It fires right up after primed with the prime lever. But then runs outa fuel. Carb will need gone through and likely new fuel line. I may build better exhaust for this saw..... little short pipe off the muff.
it sounds awesome

 

[Jethro 2t sniffer]

Awesome come over to the mac thread with it for a yarn.

 

[Trent Curtis]

Awesome come over to the mac thread with it for a yarn.

where’s the Mac thread?

 

[Jethro 2t sniffer]

Right here

https://www.arboristsite.com/community/threads/mcculloch-chain-saws.71126/page-1860#post-7314005

 

[svk]

Nice specimen. Dude you have to get that thing going!

 

[leeha]

It fires right up after primed with the prime lever. But then runs outa fuel. Carb will need gone through and likely new fuel line. I may build better exhaust for this saw..... little short pipe off the muff.
it sounds awesome

Your very lucky to have a working primer. Those are extinct now a days.

 

[Trent Curtis]

Do these old beasts not have a choke?

 

[Trent Curtis]

And what is this lever?

I’m 300 miles from home- and it’s killing me that I can’t put this saw on the bench and get it torn down. Started to on my tailgate and decided I better wait to get home carbs needs taken apart- not pulling any fuel from the tank.
Carb is the same size as the dirt bikes I grew up on- huge.

 

[leeha]

No choke, They have a primer, The lever is a air vane governor that operates off the air from the flywheel.

 

[SEAM]

You can simulate a choke by blocking the carb bore with a sheet of copy paper when starting. The saw is ready to start without the sheet when the sheet gets wet...