McCulloch Chain Saws

[knightmax]

The joys of old saws


Thanks for that description.

When cold it starts n idles happily. Once warm the tune floats around at idle and has got worse. Before it would run mint as then stop after a while and had gone rich but only at idle. On throttle it was fine at any angle. Now it goes lean on throttle when tilted. Gotta be seals

Also a place to look. I had an 850 once that i chased all over trying to get it right. turned out the impulse nipple was cracked. I scratched my head on that one for a few months.

 

[ThistleIA]

Hello folks,
I am hoping for some information about an old saw. On the bottom of the case it has a big "1" next to 51 over 61. I am guessing the 1-51 is the base powerhead and 1-61 is the gear drive conversion? On the other side I see a "1692". Maybe the serial? Would anybody hazard a guess as to when this saw was made? I apologize if the information has already been posted. This thread is 2400 pages and I am slowly chewing through it.
I have been looking at this saw for days trying to figure out the model number. Then I blasted the underside with some brake cleaner to knock the old redwood dust and oil off. Well, don't do that. The old paint doesn't like brake cleaner. It curled right off. But it did reveal the model number.

I am hoping to get this saw running, purely for nostagia reasons. It was my grandpa's saw and he gave it to my dad in the 70's. It ran strong when dad parked it back in 1990 or so and hasn't been started since. Gotta drink some beer and burn some steaks right now but I will post more pictures later.

1-61 gear drive produced 3/9/60 to 4/19/61 4.9 cube,80cc displacement.Not fast compared to newer larger direct drive McCulloch's but has torque for days & is a fun saw to run.Need to get mine outta storage & give it a go,its been a couple-three years now.

 

[Jethro 2t sniffer]

Also a place to look. I had an 850 once that i chased all over trying to get it right. turned out the impulse nipple was cracked. I scratched my head on that one for a few months.

That is a head scratcher indeed

I dragged out an old friend
She's sat underneath my bench at work for a couple years but fired up pretty well. I think I had parked it for a leaky fuel tank. Runs a fixed jet tilly and goes real well. Was once a NZ Forestry products saw. She's seen some action

 

[Jeffrey F.]

Kit now available for the 3-25 more to come !!

 

[knightmax]

OK 125 experts. What is a McCulloch 125DX? New one on me

 

[heimannm]

You'd better send that one to me Max.

The only CP (Cushion Power) DX (Designated eXport) models I was familiar with were the CP60DX and CP80DX. I'd say that saw was likely and export model but it looks more like an SP than a CP from what I can see. I wonder if anyone noticed they misspelled cusion...I supposed it's possible some chucklehead just made a label to try and irritate us.

It also has the wide wrap handle to accommodate the chain brake, another confusing bit...

Mark

 

[heimannm]

Ira - just to eliminate confusion, the internal check valve in the carburetor only comes into play when the saw is at idle. At idle speeds the velocity through the venturi is low and with the throttle plate mostly closed it creates a bit of pressure in the venturi/high speed circuit. If the check valve is not functioning, the pressure in the fuel chamber will push excess fuel out the idle passages and cause flooding.



At higher engine speeds the saw will run normally with the low pressure in the venturi allowing fuel to flow out the high speed passage and have no effect on the idle circuit.



Once the engine slows to idle speeds and the velocity through the venturi drops the pressure can and will again push fuel out the idle ports and cause flooding.

Mark

 

[heimannm]

Can someone explain to me the purpose of the hole circled in red? The green circle shows the pulse passage that provide the signal to operate the automatic oil pump (pulse pump). I am trying to understand the function of the hole towards the bottom of the tank.





Mark

 

[Maintenance supervisor]

Ira - just to eliminate confusion, the internal check valve in the carburetor only comes into play when the saw is at idle. At idle speeds the velocity through the venturi is low and with the throttle plate mostly closed it creates a bit of pressure in the venturi/high speed circuit. If the check valve is not functioning, the pressure in the fuel chamber will push excess fuel out the idle passages and cause flooding.

View attachment 1095047

At higher engine speeds the saw will run normally with the low pressure in the venturi allowing fuel to flow out the high speed passage and have no effect on the idle circuit.

View attachment 1095048

Once the engine slows to idle speeds and the velocity through the venturi drops the pressure can and will again push fuel out the idle ports and cause flooding.

Mark

Your absolutely correct Mark, I've just noticed them to turn into some kind of "mushroomed goop" that blocks the passage from functioning.
Easy to test ,by cleaning the carb passages with carb spray ,as it will dissolve the "goop" and present the normal malfunction.

 

[matt_lamb_160]

Good question Mark. Do any stuffers actually have a hole there? This is one I made.

 

[knightmax]

https://www.facebook.com/groups/mcculloch.north.america/permalink/1984967198531258/?mibextid=W9rl1R
This is the link to Facebook for the 125DX and the guy has images of a sp80DX also. Word on the street is he’s legit. He’s from Asia

 

[heimannm]

That makes sense since the CP DX saws were export models.

I have a CP60DX and CP80DX, the 80DX came from Japan and the 60DX came from the McCulloch warehouse....



The 80DX is missing the extra brace for the 1/2 wrap.





Mark

 

[Squareground3691]

OK 125 experts. What is a McCulloch 125DX? New one on meView attachment 1095045

Maybe @Jacob J.

 

[edju1958]

I got the chain from Frawley's yesterday with 93 DL & it's still too short.I ended up taking the 32 in.modified Husky bar off the 1-75 & used a 97 DL chain off my Remington Super 754.It's at the end of the tensioner,but OK for now.

 

[Squareground3691]

I got the chain from Frawley's yesterday with 93 DL & it's still too short.I ended up taking the 32 in.modified Husky bar off the 1-75 & used a 97 DL chain off my Remington Super 754.It's at the end of the tensioner,but OK for now.

95DL ?

 

[rwoods]

DX - Given the differences in paint and the condition of the hand grip, I would hazard a guess that the grip is not original to the saw.

Gasket - maybe some chucklehead (new word for my vocabulary) made the hole to confuse. It isn’t shown in the IPL.


Ron

 

[edju1958]

95DL ?

Yeah,I'm returning the 93 DL chain & getting a 95 DL.

 

[Jethro 2t sniffer]

Well put the rebuilt sp70 carb on the 81 and seems to run fine.

Found the oiler issue

 

[Breckinridge Elkins]

I took a bunch of "before" pics to track this project. I threw the chain in the sonic cleaner and shot some PB Blaster on the muffler bolts. I am going to gently clean the outside before I tear into it. I already learned the hard way that the paint won't stand up to strong solvents.
Searching around on Ebay I see a carb kit and a fuel wick. I am guessing the seller is a member here? I also see an air filter for $60(!). New fuel hoses, make a gasket for the fuel tank halves, starter rope, clean and set the points?
One thing I am wondering about is the cast iron cylinder sleeve. This saw lived most of it's life near the coast, so I wonder if the sleeve could be rusted inside. I have resisted the urge to pull the starter cord. Once I get the plug out and the muffler off I will try to peak inside. Then maybe I will pour a little 2st oil into the cylinder and crank and swish it around inside.
Any suggestions are appreciated. My primary goal is to make it run and cut. The cosmetic stuff I will tackle later.

 

[Syncop8r]

Can anyone tell me what size #6 "Screw - Brake Arm 95671" is on a 610?