Building a SP125C / 101B Kart Saw

[blsnelling]

Here's a portion of my manifolds......but looks like the slopers are straight, one dual and one single. I like the V-12 reed with the a big single burris mikuni or the twin tillitsons. The twin set-up can be alittle harder to tune. These are 4-sale.....with Leeha and RiverRat getting first choice......Don't even ask Brad!.......Hahahahahahaha!

Sweet assortment of manifolds there, Dennis. I don't see anything there I can use though. Keep trying

 

[MechanicMatt]

Dennis, that is a very impressive collection you got there. I have one question, Im fairly new to this site and am wondering, What is up with all the HAHAHAHAHHAHA? Is that like your calling card, kinda like "gigidy gigidy" or "I pity the fool" or WAIT I GOT IT, woody wood pecker, thats it! Right your copying Woody Wood Pecker? I loved that cartoon. You do have a nice collection of McCulloch speed there, I really like the dual carb setup. Kinda reminds me of a tunnel ram with two double pumper 750's on it. Looks mean just sitting there!

 

[Eccentric]

Dennis, that is a very impressive collection you got there. I have one question, Im fairly new to this site and am wondering, What is up with all the HAHAHAHAHHAHA? Is that like your calling card, kinda like "gigidy gigidy" or "I pity the fool" or WAIT I GOT IT, woody wood pecker, thats it! Right your copying Woody Wood Pecker? I loved that cartoon. You do have a nice collection of McCulloch speed there, I really like the dual carb setup. Kinda reminds me of a tunnel ram with two double pumper 750's on it. Looks mean just sitting there!

My guess is that it's an inside joke between Dennins and Brad....

 

[ausneil 1]

Here's a portion of my manifolds......but looks like the slopers are straight, one dual and one single. I like the V-12 reed with the a big single burris mikuni or the twin tillitsons. The twin set-up can be alittle harder to tune. These are 4-sale.....with Leeha and RiverRat getting first choice......Don't even ask Brad!.......Hahahahahahaha!

Dennis,, that BDC up the back, by chance is it a alky carby and if it is would it be any good to a working class aussie like me, I'm realizing of coarse others get first pic.

 

[blsnelling]

My guess is that it's an inside joke between Dennins and Brad....

Nope.

 

[youngs24]

Here's a portion of my manifolds......but looks like the slopers are straight, one dual and one single. I like the V-12 reed with the a big single burris mikuni or the twin tillitsons. The twin set-up can be alittle harder to tune. These are 4-sale.....with Leeha and RiverRat getting first choice......Don't even ask Brad!.......Hahahahahahaha!

come on dennis you have got to have one of the manifold that goes in place of the stuffer for a 4 carb set up where's it at? Thanks Troy!

 

[blsnelling]

I just talked to Terry Ives and got an excellent report. The block is good. He believes that .060" will clean it up. Also the exhaust port is standard height. It's just been filed on and needs cleaned up!

 

[parrisw]

I just talked to Terry Ives and got an excellent report. The block is good. He believes that .060" will clean it up. Also the exhaust port is standard height. It's just been filed on and needs cleaned up!

Good news!! Good to hear.

 

[Dennis Cahoon]

Dennis,, that BDC up the back, by chance is it a alky carby and if it is would it be any good to a working class aussie like me, I'm realizing of coarse others get first pic.

Neil, have several of those BDC's. Haven't looked to see if they're drilled for alkie or not. If you need them, let me know. Later Dennis

 

[ausneil 1]

Neil, have several of those BDC's. Haven't looked to see if they're drill for alkie or not. If you need them, let me know. Later Dennis

thankyou.

 

[blsnelling]

I also learned that this block has already been in a chainsaw, so the conversion work has already been done

Do I need a 101 stuffer, or can I use the one off the SP125C?

Herb told me this afternoon that someone's selling GEM like mufflers without the name on them. Anyone have a source for them?

 

[cpr]

The gusseted 101 stuffers won't work. Easiest to use a 125 stuffer so you don't have to drill the ao impulse port. The shape of them is the same anyway.

 

[blsnelling]

The gusseted 101 stuffers won't work. Easiest to use a 125 stuffer so you don't have to drill the ao impulse port. The shape of them is the same anyway.

More good news. Thanks mang.

 

[blsnelling]

I finally got around to tearing down this other SP125C that already had a 101 block in it. It had no compression and rattled when you pulled it over. I was told this saw ran and had great compression at one point. What I found is nothing short of amazing. The piston is .020" smaller than the bore! The rings are actually smaller than the piston! Three of the six head bolts were stripped out with no threads in them at all. How this thing could have possibly run is beyond me!

This .030" over piston I have is .010" bigger than the bore. It looks like an over bore of about .016" will make a nice fit for this piston.

What should be done with the rod bolts? Can they be tapped to a larger size, or should I put in steel inserts? I noticed that the threads are way receded on the three good holes. Is that necessary, or can they just be sufficiently below the surface so as to not affect head sealing?

Bore - 2.295"
Piston - 2.2715" bottom skirt, 2.2745" just below ring. Yes, smaller at the skirt.

 

[blsnelling]

Interestingly enough, the bore on my block, the one with Terry Ives, is the same. I'm thinking now that I can use that piston in this block. The bore is beautiful in this one that I'm working on.

 

[leeha]

What should be done with the rod bolts? Can they be tapped to a larger size, or should I put in steel inserts? I noticed that the threads are way receded on the three good holes. Is that necessary, or can they just be sufficiently below the surface so as to not affect head sealing.[/QUOTE]


Are you talking rod bolts or head bolts.
If rod bolts, Throw them away as well as the rod
if there damaged in anyway. If your talking head
bolts. Buy new bolts and the nuts they thread into.
The head bolts do not thread into the block itself.



Lee

 

[blsnelling]

Anyone have SKF or similiar seal PNs for these saws? How about the crank bearings?

 

[blsnelling]

Are you talking rod bolts or head bolts.
If rod bolts, Throw them away as well as the rod
if there damaged in anyway. If your talking head
bolts. Buy new bolts and the nuts they thread into.
The head bolts do not thread into the block itself.



Lee

You're right. I meant head bolts. I did have a few extra nuts laying around, lol. Guess I know where they go now. My isn't it fun learning a new engine I will be using new rod bolts.

Edit: I just went and looked. I see where three of the nuts are held in with clips, and three just slide into a recess. Those had fallen out.

 

[Jacob J.]

Anyone have SKF or similiar seal PNs for these saws? How about the crank bearings?

6620 is the SKF seal for the Flywheel side. Lee can correct me if I'm wrong but I believe 6203s are the bearings for both sides on the 125.

I can't remember the PTO side seal in SKF.

 

[blsnelling]

6620 is the SKF seal for the Flywheel side. Lee can correct me if I'm wrong but I believe 6203s are the bearings for both sides on the 125.

I can't remember the PTO side seal in SKF.

Thanks Jacob. Good ole 6203 huh? That's easy enough. Do they need to be C3?