Mcculloch sp125/101b kart saw build thread

[Bigmac]

May I join the club? Just got it a few days ago. Read all threads nothing but good, however this saw is as old as my father, I might have some stupid question later on..
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That’s a nice cp125s! Looks really original too! Welcome, and ask away!

 

[jacob j.]

May I join the club? Just got it a few days ago. Read all threads nothing but good, however this saw is as old as my father, I might have some stupid question later on..
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Welcome to the Mcculloch 123cc club, Looks like you found a nice CP125S, Ask any questions you like.
There are a few of us here that have been in these saws many times.

That’s a nice cp125s! Looks really original too! Welcome, and ask away!

We should be able to help with anything you need on your CP-125 project. There's quite a few years of McCulloch experience just among the guys in this thread.

 

[qurotro]

Thanks for the welcome!
I've found out this beast will run on prime! Piston looks fine. The intake boot is broken as usual, like other threads I read.
Is this the two pedal reed? I haven't seen a pic of the big single reed you gentlemen said as the original CP125 come with the single one.
Ordered carb kit because

 

[Bigmac]

Thanks for the welcome!
I've found out this beast will run on prime! Piston looks fine. The intake boot is broken as usual, like other threads I read.
Is this the two pedal reed? I haven't seen a pic of the big single reed you gentlemen said as the original CP125 come with the single one.View attachment 319171
Ordered carb kit because
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Your model is a cp125s, lts a later version, and may have come with the dual reed setup, or someone changed it

 

[Al Smith]

On that boot if you have all of it it can be repaired .Loctite makes a product ,401 which is used to glue o-rings together which are Buna n rubber same as the boot .The repair point will be stronger than the material .

 

[Woodslasher]

Or @Duke Thieroff makes new intake boots now, I believe.

 

[jacob j.]

Or @Duke Thieroff makes new intake boots now, I believe.

Yes, he sure does and they are a quality piece.

 

[Bigmac]

Or @Duke Thieroff makes new intake boots now, I believe.

You beat me to it!

Yes, he sure does and they are a quality piece.

They are quality for sure! They feel better than any of my nos ones do!

 

[Bigmac]

Saw this the other day, like to see your guys thoughts!

Have you guys seen a horstman block before? Do you think it’s a ported Mac block? I have my opinion

 

[Woodslasher]

Saw this the other day, like to see your guys thoughts!

Have you guys seen a horstman block before? Do you think it’s a ported Mac block? I have my opinion

I've heard of legendary 6-port 2100 jugs, maybe it was done by the same guys?

 

[Bigmac]

Did a little prep for tomorrow. Cut some gaskets, I kinda enjoy it! The paper punch is pretty handy for bolt holes!! installed the impulse barb, red loctite and clear epoxy, stated truing the surfaces, going to need a little more work!



hoping to get her mostly together tomorrow!

 

[heimannm]

Very nice work Nate.

 

[Bigmac]

Today was a struggle! The oil tank I was planning on using had stripped oil pump threads, so plan b! Lol missing a few more bolts, and make the air filter mount. Still happy with progress
Going to need the long starter ratchet and the inner tin cover behind the clutch and a falling dog, but I think I will try to fire her up tomorrow

 

[jacob j.]

Looking great Nathan - you're making more progress than I am.

 

[Lee H]

Ya lookin great, I see your CP125 has the throttle lock, I think both of mine
do not have it and never did as there is no hole for it.

 

[qurotro]

Ya lookin great, I see your CP125 has the throttle lock, I think both of mine
do not have it and never did as there is no hole for it.

My CP125S has the hole in it though. Not sure if it's there from the factory. But the throttle trigger has an adjustment screw for something.

 

[jacob j.]

My CP125S has the hole in it though. Not sure if it's there from the factory. But the throttle trigger has an adjustment screw for something.

That's the set-screw for adjusting the throttle position for the high idle/start function.

 

[Bigmac]

Ya lookin great, I see your CP125 has the throttle lock, I think both of mine
do not have it and never did as there is no hole for it.

Thanks, this saw is a mutt! It’s actually a Sp125 mostly. I would love to get an older clutch cover too, but am happy to have it he part i have!

I kinda wanted to build it as a cp125s clone, want to tear it back down and powdercoat everything if she is a runner

 

[Bigmac]

That's the set-screw for adjusting the throttle position for the high idle/start function.

It’s one of my favorite features of the late cp125s and sp saws! Makes cold starts a lot easier!

 

[jacob j.]

Thanks, this saw is a mutt! It’s actually a Sp125 mostly. I would love to get an older clutch cover too, but am happy to have it he part i have!

I kinda wanted to build it as a cp125s clone, want to tear it back down and powdercoat everything if she is a runner

The tall handle does look kind of weird though - like a short person wearing a stove pipe hat.