Join Date: Apr 2006
Location: GREECE & USA
Motorcycle: Suzuki GSX-R, Honda VFR, 1971 CB750, 1976 OMER 50 sport, Aprilia Habana
Re: Spark plug change?!?!?
CR8 is a hotter plug. Same design, just runs one level hotter, which should burn better if you are running rich.
I blackish plug would indicate a rich mixture, or oil going up there. A hotter plug can cure some of that.
Cons: You got to watch your detonation. You may have to switch to higher octane gas as regular may explodes before its time due to the heat.
Also make sure that is the cause. For example, you may have a dirty air filter not allowing enough air. Consequently more fuel than air goes in and the plugs foul or get black.