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Registered
Join Date: Nov 2001
Location: Weatherford Tx. USA
Posts: 98
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If you're talking about the clean part of the piston (upper right hand corner) I think it's caused by incomplete combustion/unburnt fuel.
I think Smokey Unich's books talk about this and how to remedy it.
Scott
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75 911S Coupe 3.4 Twin Plug - ITB - MegaSquirt
84 Carrera Coupe M491
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