Another SP-125/101b build

[cpr]

FIRE. Literally. Too much fuel started a fire behind the header on the ground. Runs, but too much lever. It won't idle. Waiting for cool down to adjust.

This thing is so LOUD! Geez...

 

[cpr]

Yes! Purrs like a leopard.

New chain gets buried tomorrow!

 

[leeha]

Congrats Charles,
Can't wait to see the video.



Lee

 

[cpr]

Video is uploading now. It ran good until it got hot. It's in the low 80s today and I still have the carb set up rich. After a couple of cuts, it refused to start again until it cooled off, that and the camera quit on me again:bang:. That's just as well because I was plenty hot myself after playing with it and the stock 125c.

The next thing I need to go to work on is air filtration. There's way too much junk getting up in there and I know the saw is sucking in some of it. I'll never get a complete seal, but I need to get some foam and play around with closing off as much as I can.

I remember thinking that 6ci Macs were cantankerous, brutal, fun... and they are, but... .

 

[cpr]

[video=youtube_share;R0jT2a-gS_Q]http://youtu.be/R0jT2a-gS_Q[/video]

 

[leeha]

Didn't look bad while it lasted.
Damn camera's.



Lee

 

[blsnelling]

I'd have needed a Valium after the 101 stopped in the cut and died! That sounded just like it seized up. Did it not do that on the next cut?

 

[cpr]

I'd have needed a Valium after the 101 stopped in the cut and died! That sounded just like it seized up. Did it not do that on the next cut?

No, ran fine after that until the carb got heat soaked. After that it ran with throttle, but when it idled down it would just load up and quit. Remember, on a kart, the carb (and the rest of it) are in open air at between 30 and 90mph. No way to offer that sort of cooling here.

It's done that before and, as much trouble as I've had with it, I've always assumed a carb problem that I haven't been able to figure out. I'm beginning to wonder if I don't have a ground-fault in the kill switch wire somewhere though. Every time it has happened (that was the third), it stops suddenly, I pull it out, and it restarts like nothing happened. Could be tied also to the filtration problem. There's air-bleeds, pumping valves... all kind of stuff not in normal saw carbs and all it takes is one little piece of sawdust to pass through and interrupt the function. I need to work on that before I run it again. Long-term, that sawdust will wreck a very expensive engine.

 

[leeha]

Charles, On mine i bought a foam air filter for a small engine
and cut it out to fit around the lower part of the carb and
intake then installed the tank over it. It may not be a positive
seal to the air box but it's much better than nothing.




Lee

 

[cpr]

It's been quiet for too long.

I picked up this filter a while ago to try to improve the air going in.

I chopped it in there. It's not perfect. On the clutch side, the fuel line pushes it out and creates some gaps. I have the cut pieces and may try to plug the gaps with that.

 

[leeha]

Same basic idea i went with. Not perfect but better
than no filter at all.
I hope to be back on my 101 project this week.
Think i found a cure for my carb issue.




Lee