I think youre talking about a 660 not a 1200 z? Sorry dint read back 3 pages lol but the person asking about co2 rather then co1 . Co2 does nothing as that is for second cylinderd cylinder which the 600s dont have

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Yamaha xt660x 2009 blue/gold mods= iridium plug, stage1+2, removed snorkel, blocked ais, akrapovric pipes, power commander pc3usb (pre made map), adjusted tps, dynojet 02 optimiser 30amp aux relay, smoked puig screen, oxford heated grips and brembo carbon ceramic pads, rfx 30mm bar raisers, puig long adjustable leavers, plus much more and a cheep �30 alarm which stopped it been stolen