2005 KX250 - Is this too lean?

[Enginerd]

I went for a ride on my 2005 KX 250 today, and did a plug chop at the end of my ride. I pulled the plug at home when the engine was cool. Does this plug look too lean?


I was using pump premium 91 octane fuel with no ethanol, mixed at 40:1 with Motul 800. I am in northwest Wyoming at about 5,200 feet above sea level. The ambient temp was 40 degrees F with very low humidity. This plug is an NGK B8ES. It looks OK to me, and should be just a touch rich this summer when its 80 degrees out.

What are your opinions?

Thanks!

[Foxx4Beaver]

that looks like it's running "safe"....both my 250 and 500 are running even lighter tan than that, and I consider them good.

[Enginerd]

Thanks for the assurance sir! The plug actually looks a bit lighter than it seems in the picture.

[Foxx4Beaver]

cool...it looks good...and if you say it's running good, I wouldn't touch a thing until it gets warm out again...roost on!