Originally Posted by
boomgagem
Yeah it's carbon build up. Byron's is bad about doing it, and it's normally because the tune is off.
Figures lol i got the engine from a guy who didnt know much and once i got it i put everything to stock settings because i could tell his tune was wrong, it ran fat for about 3 tanks then i tunned it and runs perfect just was wondering why it turned black like it was lean?