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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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  #1  
Old 11-15-2013, 04:26 PM
nokturnal nokturnal is offline
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Arrow Strange spots on piston

Is this normal for the coating to come off like this? I know wearing off is normal, but I have not seen these blobby spots before...

It's an S3 top-end/cylinder kit. ~15h on it.






What do you think??

TIA


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Old 11-15-2013, 04:39 PM
AZRickD AZRickD is offline
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Looks like a low-pressure fluid flow after shut down rather than a high compression blow-by.
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Old 11-15-2013, 04:49 PM
nokturnal nokturnal is offline
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to be clear, i am talking about the silver blob marks, where it appears the "moly"(??) coating has worn/chipped off.
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Old 11-15-2013, 04:50 PM
nokturnal nokturnal is offline
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Quote:
Originally Posted by AZRickD View Post
Looks like a low-pressure fluid flow after shut down rather than a high compression blow-by.
Are you saying something (like gas?) is eating the coating off after shutdown?
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Old 11-15-2013, 11:22 PM
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Default strange pattern

I am having trouble w pic. Is that the piston skirt, or is it cylinder wall w piston at bdc? Either way, i have never seen that. Just trying to understand what i am looking at.
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Old 11-16-2013, 12:47 AM
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Its piston skirt. I've not seen the coating wear off like that either..
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Old 11-16-2013, 06:38 AM
nokturnal nokturnal is offline
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Yep. It's the skirt and you can't feel them.

Someone with a lot of experience with engine building figures it was just not cleaned well prior to coating.
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Old 11-16-2013, 08:01 AM
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Mine are like that.
Probably from the ethanol blended swill.
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Old 11-16-2013, 08:51 AM
nokturnal nokturnal is offline
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no ethanol has touched this engine since I have owned the bike. well before rebuild.
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Old 11-17-2013, 11:57 PM
vmxwinn vmxwinn is offline
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The coating on my Worsner piston came off too, but a little more uniformly. See you on the RZ site also.
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