Mcculloch sp125/101b kart saw build thread

[Bigmac]

Got a little eBay bling! Lol pretty happy with the factory chrome

 

[Lee H]

Nice, I like chrome

 

[Bigmac]

Have been wanting to do this color scheme for a very long time!

 

[Steve]

Have been wanting to do this color scheme for a very long time!View attachment 332702View attachment 332703 View attachment 332704View attachment 332705

That looks freakin' sweet Nathan!

 

[Lee H]

Ya can't hate that, Almost better than sex, Looks awesome Nate

 

[Bigmac]

So the black chip screen was kind a bugging my, and white ones are unobtanium…so I painted an nos one, hope it holds up!

looking for some larger kart spark plug boot covers, if anyone has some, or spots an auction, let me know!

 

[Lee H]

Saw porn right there. Looks great.

 

[Woodslasher]

I know this isn't a SP125 or a 101b, but I noticed something different on a CP125(?) and a pair of 125's I'm rebuilding. The 125's have a webbed brace on the front of the saw while the CP has a solid-type brace. Are the mounts any different? Why did Mac change styles? Am I over-thinking a rather trivial part?

 

[Bigmac]

I know this isn't a SP125 or a 101b, but I noticed something different on a CP125(?) and a pair of 125's I'm rebuilding. The 125's have a webbed brace on the front of the saw while the CP has a solid-type brace. Are the mounts any different? Why did Mac change styles? Am I over-thinking a rather trivial part?
View attachment 343381 View attachment 343382

I have not seen the solid mount, wonder if it homemade?

 

[Lee H]

I haven't seen one of the solid mounts either.

 

[jacob j.]

I have not seen the solid mount, wonder if it homemade?

I haven't seen one of the solid mounts either.

That would be my theory - that someone machined a replacement. I've never seen that style either.

 

[Woodslasher]

Interesting, if I remember I'll pull it off tonight and put up some pics.

 

[Woodslasher]

That would be my theory - that someone machined a replacement. I've never seen that style either.

Machined is a little kind, rasped is closer to the truth. The solid mount is...... plastic. Yep, a big ol' brick of plastic rasped into the shape of the mount. It's got a few splits in it but since my buddy likes preserving logger fixes on his tribute saws I'll probably mount it up on his saw.

 

[Lee H]

That looks plastic to me or some sort of. I would say definitely home made.

 

[heimannm]

For the big saw enthusiasts, I found a few of these this week.

69241 is for the CP125. I have a few 69242 and 69243 as well.



This was evidently and updated collector with integral line to connect to the fitting on the carburetor in the top tank saws fit with the Walbro/MAC carburetors. The earlier version was a stamped steel or plastic box with a separate line to connect to the carburetor and put any spitback back into the carburetor.



Plastic



Stamped steel



Mark

 

[qurotro]

Standard bore piston?

 

[heimannm]

69241 is the standard bore for the CP125 but I don't think they will work in the SP unless you change the connecting rod, maybe JJ or Nate will confirm that is correct.

69242 and 69243 are +0.0.010 and +0.020 respectively.

Mark

 

[jacob j.]

69241 is the standard bore for the CP125 but I don't think they will work in the SP unless you change the connecting rod, maybe JJ or Nate will confirm that is correct.

69242 and 69243 are +0.0.010 and +0.020 respectively.

Mark

Right on the money - CP pistons need the same 1/2" wrist pin connecting rod as the 101. The SP rod is markedly different and not interchangeable.

 

[Lee H]

Taking a brake on another project. Got this one today. It had been gone through but didn't run right
possible carb issue or leak somewhere although i was told it passed pressure vac test. So looked it over
a bit and decided to remove the muffler. Piston looked good then i see something. Now the saw is in pieces.

 

[jacob j.]

Was it just the wrist pin in backwards or was the entire piston in backwards? Were both wrist pin clips in there?