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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Os 50 Hyper what would be the cause
04-26-2009 03:07 AM  9 years agoPost 41
Pulento

rrVeteran

CHILE

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That engine was run lean most of the time, Does not matter where the needle was set.
+1

Maybe the bearing broke. But it was running lean way before that, that amount on varnish on the piston is the proof. The whole piston is brown !

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04-26-2009 10:45 AM  9 years agoPost 42
datidun

rrElite Veteran

N Ireland

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there is nothing wrong with the bearing as i said before ,its the piton ring that broke

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04-27-2009 08:11 PM  9 years agoPost 43
Tolla

rrApprentice

Cape Town, South Africa

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Not so long ago I had a piston ring break and cause exactly the same damage.Replaced piston , ring and sleeve as well as the bearing since the motor was open in any case. Run her in again and she's as good as new.I'm still running the orignal dinged head.

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