Do you think the grey ring on the outside of the center tip is suspicious ? :plemplem:

I suspect it could be the cause of some *small* *occasional* troubles at high-rpm...

And yes, I'm running too rich. BUt what matters to me is this "grey" ring....

It's a B8HS NGK running on a stock PX125E.

Thanks

KTy

http://www.spark-plugs.co.uk/pages/technical/diagnosis.htm

edit:

heard this grey ring comes from additives in modern fuel.

i'm not quite sure about this.

Bearbeitet 6. April 200620 Jr. von King Kerosin

looks delicious!! no problem with this spark!! Put it back in your scooter and drive!!

Greetings

Jo