mmz77

Member
Oct 15, 2006
435
0
I have a quick question on the air fuel mixture for my CR250. I would like to know if I should adjust it due to the fact my spark plug looks a little sooty and black, but I pulled it after I let it idle and didn't even drive it and it the engine didn't get a chance to warm up. Should the spark plug look like this even though I did not drive it or let it warm up?

The bike runs great, doesn't blow smoke when it is warm and doesn't foul plugs and has awesome response with throttle and never seems to bog down. Should I just leave it how it is?

I know that I am a Worry-Wert :laugh: Thanks
 

XR250rdr

Member
May 27, 2003
95
0
A plug check after idling means squat. It sounds like its running fine.

Since its gotten colder out, I'd pay attention if it starts surging when you close the throttle or pinging under load. Sometimes you need to fatten up the jetting if its much colder out. Often it will just start surging and turning in the air screw a bit will fix it.
 
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