Can't find any reference on here from past discussions on O2 Eliminators and Emulators, but can anyone please confirm the type of O2 sensor that the XT's use? Narrow band Zirconium per chance? 0.1-0.9v? There's plenty of 4 wire universal sensors available at a fraction of the OEM (Denso) price.
I'm all googled out trying to get my head around it!

Thanks!!

Narrow band 0.1 to 0.9 V, not sure if it is a Zirconium.

You can't use a fixed voltage to fool the ECU, it will run rich & lean in cycles if it sees a fixed Voltage between 0.1 to 0.9V. You either need to turn the closed loop circuit off or build a emulator that fluctuates the voltage at given time cycles.

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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

Cool. Thanks for the reply Kev.

I actually want to keep the fuelling standard (as much as it can be with a K&N filter, chopped and 180 degree rotated snorkel and now a single MTC can).
Just didn't wanna pay OEM prices for a suspected duff sensor! (Bike running rich and has done 95,000+miles).

When I know I've got " 1, 2, 3, 4, 5.........sensors working overtime"!! (XTC) if there's still fuelling issues then I'll see what's worth doing.

...in case of future use for anyone:

O2 Sensor part no is 1B9-8592A 00 00 and is also fitted to the YW125 Zuma scooter (USA) and was for a while on the XP500 TMax. It seems to typically retail at about $170-190 in the States. Hence wanting to find a cheaper alternative!

The manual for the Zuma (excert below) confirms that it is Zirconia thimble type sensor with a heating element resistance between 11.7 - 15.5ohms.
I suspect that the heater element output is the main issue hence the need to confirm impedence of any universal type replacement.

Found this a useful source of info:
http://www.picoauto.com/applications/lambda-sensor.html

Of course, if funds aren't an issue then just forget all this and get a PCV & WideBand datalogger!!

Attached Images

	O2Sensor.jpg (93.1 KB, 20 views)
	O2SensorSpec.jpg (102.8 KB, 16 views)

Did you manage to find an aftermarket sensor to suit? If so can you link it up please? I've had a few hunting issues with mine and I'm wondering if the sensor is on the way out.

I haven't taken the plunge/made a choice yet as I'm still in the process of circuit testing (slightly delayed due to hernia op so can't move/bend too quickly or lift much). I'm also still trying to get my head around sensor design. So now my head hurts!!!!

If you do a google/ebay search with a combination of "universal, 4 wire, zirconia, oxygen, o2, lamda, sensor" plenty of cheap options come up. The only problem is knowing if you'll get one with the right power heating element. It's worth noting that the OEM Denso sensor has a wide body (the exposed part) - for the reference air/heating element??
Whereas cheaper "universal" sensors appear to be a lot narrower; so that may also affect their effectiveness/heat up time??? Alot of them do appear to have a less powerful heating element (eg. 6ohms).

For info: It seems like the generic Yamaha code for the sensors is 8592A(-00-00). There's just different prefixes for different applications. Eg. FJR1300 sensor (2D2-8592A-00), XP500 Tmax (5VU-8592A-00) and XT660R/X/Z (1B9-8592A-00)

This German site lists the European models that use "our" O2 sensor which may help in tracking down a "nearly new" one.

However, it's clearly worth eliminating all other possiblities first before replacing your O2 sensor (especially if you have no way of testing it).