I measure A/F ratio by means of some specialised equipment from Honda.

I checked O2 sensr and it was dead. I replaced it with new one and car runs better, but still header temperature is to high and spark plugs are too grey, so I think the A/F is still too lean. On Monday I will be able to measure A/F, but it seems that O2 sensor was not the major reason for he problem.

What Can I do?