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.

Yes it does (although in practice it actually "decreases" the A/F ratio from 14.7 to 13.6:1).

Yes, but it only does so at idle and up to a 2% throttle opening. The CO setting exists simply to adjust/clean up emissions at idle and just off a closed throttle.

Fitting an O2 controller does not affect CO setting, this can still be changed manually in the DIAG mode. The O2 controller does not disconnect/eliminate the closed loop circuit. It still remains and the O2 sensor still does its stuff and feeds information to the ECU. However, what it does is intercept the signal and modify it, effectively changing the ECU's target value for A/F ratio from 14.7 to 13.6:1 in the closed loop.

No, they serve completely different purposes. The O2 controller is the only way to modify closed loop fuelling. Buying the Fi tool and adjusting the CO is not going to have the same effect at all.

Just get yourself an O2 controller. You will be pleasantly surprised by the difference it makes!

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One correction, the CO in the dash of FI adjustment has no affect on the closed loop A/F ratio, the CO is a static base mixture adjustment that can adjust the A/F ratio from idle to approx. 2% throttle or 18 on a TPS valve for the open loop map, after 18 on the TPS the bike will run on other maps & the manual CO adjust has no affect.

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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
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My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946

Hey DirkZ, from memory your South African Tenere is fitted with a DNA air filter? in which case your bike would definitely benefit from Kev's mod's to get the air fuel mixture to where it needs to be.

Or are you intending to fit them to your Australian bike? I have fitted both Kev mod's to mine & its been the best thing I've done to it to date.

Thanks so much clearing up the situation of CO and O2.
Desert Racer you are correct, my South African bike is so much more potent than the one in Aus and I'm just planning how to fix the "problem" in Aus. I'm taking a DNA air filter with me for that bike and will probably ride over to Kev to get an O2 controller from him.
I was just under the impression that when the DNA filter was installed (with aftermarket pipes), the standard A/F mix gets too lean and that's why the technicians here increase the CO to richen the fuel mix a bit.

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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.