Northern Piped saw

[Yukon Stihl]

Hi All
I rescued this old girl from a shed in southeast Alaska.
Came with a 12 volt starter and was told "you need two big guys to hold her down when you start it"
Also was told that it was an alcohol saw. I would like to know what i would look for to see if it was an alcohol saw.
It looks like it is in the remnants of a 125 frame.It is seized,but supposedly ran at the state fair a few years ago.
It is now in my heated boiler building awaiting a chance to see how bad things are.Came with a nice roller nose bar.

 

[EvilRoySlade]

Hopefully it didn’t get seized because of alcohol. Sounds like fun times ahead.

 

[B440]

Alcohol? Look for a very large mainjet. It should start on gas, but it will be too rich and blubber out after a few seconds. Like that pipe!

 

[Chainsaw Jim]

Judging by the set up and fuel line size I would think it is set up for running alcohol.
Also, judging by the look of the leaf litter, it looks to have been sitting out in the open weather. Maybe rain made its way down the pipe and rusted the rings to the bore. Hopefully the chain is salvageable because it appears to be 1/2" chisel.

 

[jacob j.]

The pipe looks like an old shifter kart pipe, sized for a YT-125 or similar. The carb looks like a BDC carb. I'm betting it's a 101 engine or a variant. Look for the removable head.

 

[Chainsaw Jim]

Yeah Jacob, I'd say it's a removable head based on the size of gap where the gasket would be where both versions of the 125 seem to have the same gap as the rest of the fins. Also, the fin configuration matches the 101.

 

[Yukon Stihl]

Hi All
So i rescued it to late.
It is an alcohol saw because the PO neglected it after alcohol took hold of him.
I had some time this evening to take it apart as far as i could.I hope that i can get it to run again but it will take some parts and time.Too bad i believe it original owner died and it was sold to the guy i got it from.I used to buy sled parts from the original owner and I'll bet the saw had some money in it.
Does anyone have or know where i can get a socket for the rod bolts.The rollers were still shiny so i am hoping the crank will be savable.
The inside of the carb is full of white powder but seeing it is huge a person should be able to crawl through the passages and clean them.
The head is removable rough bore of 2 3/8" carb bore of 1 3/8" the cylinder from my IEL Beaver is 1 7/16"
Anything special about the read cage?

 

[Yukon Stihl]

The pipe had a cap in it as well as the cap over the carb...
3 years ago i was at the guys place just after he did a display for the state fair.The piped saw was in a log on a trailer out in the open,the pipe was not the culprit the water got in through the carb.
Seems to have a better quality fan shroud and fan?
Any guesses on the carb? no numbers or letters anywhere.

 

[Yukon Stihl]

And a few more...
How about the clutch anything special about it?
And some body mentioned chain it's been stoned on the sides and he was a Stihl dealer.36" from roller tip to body
Anyone ever seen a tank like that one around?
And a view through the exhaust.
So i would love to get any info anyone has on this saw.I hope to get it running again some day.I just had to see if thee was anything left to save and getting a socket for the rod will help.Once i get the crank out i can work on getting the piston out.Then the true story will be told.

 

[Redfin]

Clutch is press fit. May pop right off after nut is removed. Cool find, looks like you have your work cut out for you.

 

[Chainsaw Jim]

The pipe had a cap in it as well as the cap over the carb...
3 years ago i was at the guys place just after he did a display for the state fair.The piped saw was in a log on a trailer out in the open,the pipe was not the culprit the water got in through the carb.
Seems to have a better quality fan shroud and fan?
Any guesses on the carb? no numbers or letters anywhere.

It looks like a BDC carb.

 

[J_M____]

Get some marvel mystery oil soaking on that piston

 

[Marshy]

I live near a vintage snowmobile shop that has every imaginable part. If by chance it has snowmobile parts I can probably get some for you if needed. Identifying what you got is going to be the hardest part (obviously).

 

[Willard]

Yukon Stihl, yup those Macs were top dogs on the PNW coast in the 1970's- early '80s.
My older brothers ran a couple of Walkersized Mac 101 kart saws back then. They were running 34mm Tilly HR carbs on them. One of their buddies had one too. All 3 have been laying in card board boxes in pieces ever since here in northern Manitoba.

Get a hold of Bob Walker in Nanaimo, B.C. he was the guy who built these saws and I can"t think of anyone on the planet who knows these Macs like he does.

Here's a pic of my brother Dennis running his 101. They were darn quick at the time.

 

[RI Chevy]

@Lee H

 

[Lee H]

@Lee H

I know, I need to put a pipe on mine.

 

[Deets066]

I know, I need to put a pipe on mine.

So you could quiet it down some?
Lmfao

 

[Willard]

That pipe on my brothers 101 has a inverted stinger pipe inside the outer cone.
Works better then outside they say.
Couple of the 101s balance weights broke off the cranks and blew them up.

 

[Al Smith]

It isn't really a "pressed on" clutch .The shaft is tapered,but not keyed .The taper acts like a Morse taper drill bit with the wedging action .McCulloch outlined in a service alert the reason they went to that was to prevent tearing out of the keyway slot which ruins the crankshaft .Matter of fact I have several ruined cranks from 10 series engines that did just that .
You could probably save most of that saw but it will need some parts no doubt .

 

[Al Smith]

I think they called that reed set up a "V4 " which has more area than the double flat reeds .I'm not certain weather it was an OEM option or after market but would assume the later .During the golden age of two cycle karting there were many after market suppliers for just about every engine made including of all things an AH 47 Power products .