As I understand it, Kev's O2 Controller increases the A/F ratio to about 13.6:1 from the standard 14.7:1 in the closed loop section of injection system.

The CO setting only affects the closed loop and by adjusting it up on the XTZ (with F1 tool) also increases the A/F ratio depending on the amount of upwards adjustment. Am I correct with this assumption ?

So by fitting the O2 controller, how does this affect the CO setting, or does it disconnect the bike's closed loop (CO) setting and just fix it at the 13.6 ratio ?

Kev's O2 controller is cheaper than the F1 tool (for the XTZ) and will essentially do the same if one just wanted to get the closed loop setting richer.

Or am I missing something here ?? Please enlighten me before I purchase one.

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2014 XT660Z - Barrett pipe, DNA stage1.5, Barkbuster hand guards and handlebars, Pivot pegs, Teknik suspension, Guard-it engine protector combo, B&B rear rack, Trax topbox.