My bike 2010 Z, OTR blue foam filter kit, MTC titanium single can with home made baffle. Bike ran fine no surging pulled from low down ok. Fitted the 02 controller well ****** me it's like riding a different bike, I can change up earlier and potter in a higher gear. This did lead to a few problems at first mainly stalling the bike as I was in 2nd gear instead of 1st.
This made me want a Kev mod to improve top end and dash mount it had a look at Kev's but to big to fit behind plastic panel so made one (sorry Kev).
Now the interesting bit with the Kev mod is you can see it working. Bike in neutral get it warmed up hold at 3k rpm then play with your Knob, turn slowly up there will come a point when the rev's will suddenly rise mines about 3 o'clock turn back rev's drop.

Missed this one, thanks for your feedback nice to see my tinkering in my workshop helps other riders around the world.

No problem making your own fuel mod all the info is there for XT660.com supporters.

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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

Hmm, where can I buy this O2 controller? Didn't find it in the xt660-store? Do I need something else? I have a GPR powerjet (some sort of a power commander) and BSM-exhaust and K&N filter on My bike.. In slow speed the bike is a litle bit jerky I think..
Want to get rid of that if it's possible.

What's the difference between the o2-eliminator and the o2-controller?