MCCULLOCH The official McCulloch thread

[justoldsaws]

No not yet, on Mike's site it says there only 1mm difference in the bore between 105 and 125.

 

[justoldsaws]

Freebie saw from a co worker, this was going to be thrown out by his uncle and he saved it for me.
I have 2 x 250's and a Super, this is my first with the black clutch cover.

 

[Al Smith]

Any time you put a 101 in a stock saw chassis you are detuning the 101.
The 101's came from the factory with a carb that has a 1-3/8 throttle bore.

I've seen vid clips where people had claimed to have a 101 in a 125 frame work .Quite frankly they didn't run as good as my two stock 125's . What ever oohs and aghs came from people who had never seen a good running 125 or a 101 for that matter .

 

[Al Smith]

With regards to the 250 I have several .Two or 3 yellow cover and one black cover which I'm not yet certain if it's a 250 or a super .The dang thing has a flat back back carb which is the biggest pain in my buttocks .Whoever designed that contraption should be neutered .Nothing was wrong with the original Tilley model HL and they hung that thing on them .If it had a choke instead of a primer things might have been different

 

[Al Smith]

I agree Al, probably iron of some kind, I was speaking in general terms

If it were steel my guess it would be type 4140 which is used for aircraft cylinders .The problem being two fold ,the thermal rate of expansion and the fact 4140 is much more difficult to finish than cast iron .FWIW the pistons rings for both the CP 125 and the SP 125 are the same which are tool steel .I'm not certain if those would work on hard steel like 4140 .Then the fact that cast iron has the ability to carry the oil film better than steel so it's more or less a guess on my part as to how well it might work .

 

[Al Smith]

--More --When I resleeved a 125 some 10-11 years ago I went with grade 50 fine grain cast iron .It's the same as what Harley used for cylinders .Ford,where I work I think uses nodular iron which is stronger but again is more difficult to finish .Keeping in mind that's all done on CNC machinery and all I have is a few old lathes and a milling machine that's older than me .I have not a clue what Harley uses these days on the modern aluminum engines .

 

[justoldsaws]

Have you measured the bore?

58mm

 

[Bigmac]

58mm

Great!! What are your plans for her?

 

[justoldsaws]

Great!! What are your plans for her?

Piston needs replacing for sure, hope the cylinder isn't scored as well.
Overall lots of work needed.

 

[Bigmac]

Cool! Make sure to check and see if you can find the cause of scoring, seals, intake boot, air leaks and what not!

 

[justoldsaws]

Today's Mac haul, was being thrown out, a buddy saved it for me.

 

[Bigmac]

Today's Mac haul, was being thrown out, a buddy saved it for me.
View attachment 122485

Nice haul!

 

[justoldsaws]

Nice haul!

I'm seeing 125 parts

 

[Bigmac]

I'm seeing 125 parts

Ya I looks like 2 oil tanks and maybe a starter base and cover, that great!

 

[justoldsaws]

I'm seeing 125 parts

 

[Bigmac]

View attachment 122487 View attachment 122488 View attachment 122489 View attachment 122490

Ya that’s great! Muffler cover lower handle and much more!! Way to go!

 

[justoldsaws]

Came across this while digging thru service bulletins, I'm sure someone came use this info.

 

[justoldsaws]

Continued

 

[justoldsaws]

 

[Al Smith]

What in the world did they use that thing on?