Building a SP125C / 101B Kart Saw

[Jacob J.]

Anyone have a flywheel key for a 125? How about a front lower AV mount, the one on the bottom of the wrap handle? I also need a coil for that will work on the 101 block.

The first saw is in primer. I'll be shooting the color here shortly.

The flywheel key can be had at a hardware store.

 

[ozflea]

Also, the 101b has a steel sleeve, so it can be overbored like a car engine. There are aftermarket pistons up to .060 over which pushes the displacement to over 130 cc's. Overboring the cylinder is very easy because of the removable head. It does not require a bottom bore, which is much more difficult. Combustion chamber stays the same, so compression ratio goes up as well. One of my saws is .050 over, which is 129cc I think.

Truth is they can be bored a bit further than that i have slugs here up to 110 thou with rings
Thats how they grow to 133cc

McBob.

 

[jra1100]

Try starting a SP125 without using the decomp and you'll understand that both the SP125 and 101 are bears and big nasty bears at that

McBob.

Now if that ain't the truth nothing is. I'm not sold on drop starting it, I did it once and it worked fine, tried again and near ripped my arm off. In the video he said to get it TDC, and perhaps that will help, I may need to have a few beers and screw up my courage. I'm not a small person either, and not real weak either. These are DEFINITELY not your average box store homeowner saws. Of course if your following this thread you already know all that. JR

 

[Dennis Cahoon]

Anyone have a flywheel key for a 125? How about a front lower AV mount, the one on the bottom of the wrap handle? I also need a coil for that will work on the 101 block.

Sure do!......How many do you want.......Hahahahahahaha!

 

[blsnelling]

Sure do!......How many do you want.......Hahahahahahaha!

Just one, lol. And throw a coil in there with it I've got one on this MC91 here, but it's a complete engine and I don't want to start scavenging parts off of it.

 

[blsnelling]

2 hours in the over @ 170°F.

 

[ozflea]

2 hours in the over @ 170°F.

Hate to be the bearer of bad news but unless you shave a few fins on top of the 101 head that SP125 cylinder cowl wont fit
Did you try it on before painting it ?

McBob.

 

[ozflea]

Sure do!......How many do you want.......Hahahahahahaha!

Nice to see your following this thread Dennis ................ you must be lacking entertainment elsewhere haven't you got a Plastic Honda to play with ? he, he, he, he, he, he, he, he, he, he, he, he,

 

[Brian13]

That turned out really nice Brad!! Cant wait to see it come together.

 

[Ambull]

Nice job on the paint. Looking good.

 

[Ambull]

Hate to be the bearer of bad news but unless you shave a few fins on top of the 101 head that SP125 cylinder cowl wont fit
Did you try it on before painting it ?

McBob.

I think that the cowl was on the saw when he got it, so either the fins have already been shaved, or for some reason it just fits.

 

[blsnelling]

I think that the cowl was on the saw when he got it, so either the fins have already been shaved, or for some reason it just fits.

The cowl that was on the saw was in very poor condition. The holes where the upper AV bracket mounted were all busted out and put together with washers. This is a NOS one that I got with all the parts with these two saws. I did put it on before painting, but did not bolt it down. It looked tight, but looked like it would fit. I'll find out today.

 

[Tzed250]

Duhtaylz please!! What paint? Color code?

 

[carym2a]

2 hours in the over @ 170°F.

Dang, sure is purdy

 

[blsnelling]

What a relief! When you're working with a repainted saw like this, you don't want to have problems with it, and have to keep taking it back apart. She fired right up, runs great, kill switch works, oiler works.... Amazing! I couldn't be happier. I have one thread to repair on the recoil. I'd like to accent the logo on it while I have it back off. It could also use a new spark plug cover and pull handle. I believe the owner has a newish handle to install on it when he gets it back.

[video=youtube_share;jmGycpqvpCU]http://youtu.be/jmGycpqvpCU[/video]

 

[Anthony_Va.]

Man that is just a thing of beauty! :msp_wub:

You've outdone yourself on this one ole boy.

 

[leeha]

Looks great Brad. Ya done good.



Lee

 

[Ambull]

That saw is really sharp. I'll bet it cuts pretty well too.

Good job man.

 

[gink595]

Beautiful saw, great build thread too

 

[Dennis Cahoon]

Nice looking saw Brad......but the blue isn't the right blue......just nit-picking!