Hi reader,

After installing the O2 + Fuel mod from Kev (have not yet but will today ), does the CO setting with the F1 Diag tool still matter? I know its only for the <2% throttle idling but I am worried going full Stage 2 filter that my idling will be too lean if i do not adjust the CO with the Diag tool. My thinking is that I do not have to worry about it seeing that the two mods from Kev takes care op both open and closed loops right?

If it does matter what is the recommended setting with the Diag tool (will take it to Yamaha to set).

Thanks for any answers.

Leave the CO as it is. There really is no need to alter it on the XT660Z models.

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