Author Topic: Black Piston  (Read 615 times)

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Offline dpjones

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Black Piston
« on: September 19, 2017, 02:03:17 pm »
This is the piston from an 029s with the 039 A/M cylinder. This is the second time I've tore it down after milling about 500 or so board feet of yellow pine. At the time it was what I had, got a 660 now. The rings are stuck and the exaust side of the pistone is solid black. I'm was 93 octane with Klotz synthetic oil the first time, second time was Motul 710, same gas at 50:1. Just don't seem normal to me, any ideas? I thought the oil would be ok, maybe not?
Thanks
DPJ

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Offline dpjones

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Re: Black Piston
« Reply #1 on: September 19, 2017, 02:07:04 pm »
Forgot the piston

Offline Cut4fun .

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Re: Black Piston
« Reply #2 on: September 19, 2017, 02:14:33 pm »
Which klotz oil?  That looks like super techniplate.   I had it start doing that to my saws about 10 years ago and quit using it.

I dont know anything about the Motul 710 oil. Mike does I think. 

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Offline Cut4fun .

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Re: Black Piston
« Reply #3 on: September 19, 2017, 02:16:58 pm »
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Offline mdavlee .

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Re: Black Piston
« Reply #4 on: September 19, 2017, 08:09:14 pm »
Motul 710 was a clean burning oil. What kind of tune are you running?
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Offline dpjones

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Re: Black Piston
« Reply #5 on: September 19, 2017, 09:10:24 pm »
Your rite, it is the super techniplate, and I didn't run the saw too much after I started using the Motul cause I got my 660 and the 029 was running awfull.  I thought I may have been a little lean on the tune, the spark plug tip was  a lite color, sure looks rich on the piston though and the black is sticky/gummy also. My 038s done the same thing only not as bad, rings didn't stick. I thought the rings might be leaking the exaust by them? When I rebuild it I'll go back with Caber.

You seemed to have spotted the techniplate oil right off so maybe it's not good in saws.
I just thought it might lube better milling.
 I've went through allmost a quart of the Motul 710 in my 660 at 50:1 I'll pull the cylinder and check it. If it's like this I guess I'll just run stihl oil. Any advise is appreciated, milling seems all together different on the saws than firewooding
Thanks
DJ

Offline mdavlee .

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Re: Black Piston
« Reply #6 on: September 20, 2017, 08:07:16 am »
I've run down to 16:1 with some of the bike oils milling. I never run less than 32:1 since that's about 60% more oil. Heat is the killer and 50:1 doesn't leave much oil for bearibgs. Pistons are cheap compared to a crank.

Offline dpjones

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Re: Black Piston
« Reply #7 on: September 20, 2017, 10:35:56 am »
You think at 50:1 it ran hot and heat caused the piston to look like that? I don't see any wear, the first time I tore it down it was just as bad, when I got it cleaned up it looked fine, ring gap was same as when new, machine lines still on piston, maybe the cylinder an piston was a dudd, when I got it the impulse line connector was missing from the cylinder, had to rob one from another cylinder. I'll run the 32:1 don't mind at all, I don't want this to happen to my 660 or even the 029 for that matter.
Thanks
Dj

Offline Cut4fun .

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Re: Black Piston
« Reply #8 on: September 20, 2017, 12:38:28 pm »
JMO if going to use Klotz go to the  Klotz KL-200 Original Techniplate 100% Synthetic. Thats what I switched to 10 years ago and never a problem. https://cometkartsales.com/Klotz-KL-200-Original-Techniplate-Quart.html

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Offline dpjones

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Re: Black Piston
« Reply #9 on: September 20, 2017, 01:01:44 pm »
I had the other Klotz. Allmost afraid to do any more milling till I find out what the problem is or was? Maybe my tuning, When I set the high side, I set it so it would 4-stroke untill I put it in the cut and cleared up, when I set for milling same thing and then turned out maybe 1/8 more. I'm not doing something right though

 

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