07-19-2006, 08:31 PM
Ehh it could be from being to rich, or it could be from running to hot. It looks alot like carbon build up from running rich and not hitting peak rpm's to clean it out often enough, but all the ripples on the black looks kind of like pitting, so i'm not to sure on this one.
-Pete
-Pete
Everything R/C Forsale-http://www.chitownrc.com/showthread.php?t=7476