Kev, your o2 mod looks the way to go - I'll definitely invest soon (saw your ebay listing).
The mechanic had a go at sorting the surging and did a pretty good job .... BUT, over time I realised it was at the expense of the top end of the rev range (harsh - esp freeway). He confirmed that he only played with the CO setting and now wants $85 dollars to change it back - it's been awhile, so I can't really argue too much - nor do I want to (argue or go back to him - other issues too).
I went into the CO setting and it was on 30, which seems pretty high from what I've read here. I changed it back to 20 and gave it a ride - the surge is marginally (?) worse, but the higher revs are noticeably better. The issue is I don't know what the original setting was. I'll try to get the original settings off him, but in case I can't .... from what I gather in the forum, 8-10 is the normal OEM setting. Is that about right?
I know it's different between bikes, but it can't be too different. FYI, bike is in Melb, Oz.

OK, rang mechanic, and he says they wouldn't have recorded it (!!) and it is usually 0 (zero) "on those bikes" what ever that means .. blah, blah ... obviously no real recollection, and my $85 session will be an episode of trial and error.
Right so, not going back to him.
Can anyone who has changed their CO1 levels, report back on what their original settings were, and maybe I can get a bit of a consensus/average and go from there?
Mine is a >2007 xtx if that makes a difference (2009 - with O2 sensor).

It would be Zero to +5 on a 2007 model, if they charged you $85 to adjust the Co they are a rip off, mechanic's like these guys give us a bad reputation.

The Co adjustment makes no A/F corrections over a TPS reading of 18 which is around 2% throttle opening, after a TPS angle of 18 or 2% throttle opening the bike runs on a pre-programmed fuel map which can only be adjusted with one of my fuel mods or Power Commander + one of my O2 Controllers or Dynojets O2 Optimizer.

Would that be the same for 2009?
.... sorry, I wasn't very clear - I was saying it's a post2007 and had the actual year in brackets - it's a 2009 (it's got the 5VK-8591A-11 ECU).
He/they also broke my left side tank cowl snap-mount - granted it was a tough ****** to slip out of the grommet, but I previously managed it without breaking it - they tried to glue it back with Tarzan's grip (or snot?)!! I promptly dropped the bike on it about a week later (broke it proper) so it was a moot point. But overall, very unimpressed.
Like I said, I took the CO1 back to 20 and the engine is revving much more freely now (again) - much nicer to ride. By the sound of it, I could wind it back even more (and I will try it). It seems pretty good - and the snatchy low end is coming back.
I'll play with the TPS angle a bit too. I also get the cut-out - usually when I'm blipping the throttle for a down-shift.

As mention the Co1 adjustment is basicaly from idle to 2% throttle & can not adjust the A/F ratio above 2% throttle openings.

I would set your Co1 to 5 to 10, a CO set above 20 on your bike will be to rich at part throttle & will cause the bike to cut out as mentioned.

The only way to reduce the surging is to control the open & closed loop fuellings, the Co1 adjustment can not adjust these areas.

Open loop with a Power Commander or one of my fuel mods.
Closed loop with a O2 optimizer or one of my O2 controller.

Yep, after reading up in here about open vs closed loop (and why Yamaha do it) I see why the gizmo is needed.
I definitely will wind the CO1 back some more. Riding today confirmed that it's better at high revs, but nowhere near as free spinning as it used to be. I'll live with the surging until I get the gizmo (O2 Optimiser) - I much prefer to be able to spin up the engine when I need to.
It really was nasty at high revs on the CO1=30 setting - actually, to be accurate, it was more like steady throttle at high revs (freeway etc) - although surging at low revs was pretty much gone.
Thanks for the advice - although I am a bit confused ... Are there 3 (Kev) mod options? - I thought that there were two:
1) Fuel Mod: (from 660.com store or self-build) - change air temp reading - richens A:F for more power and/or for intake/exhaust mods.
2) O2 Optimizer: (from eBay) - changes O2 reading - to control surging (makes closed loop A:F closer to open loop A:F)
3?) O2 Controller: (?) - superseded by O2 Optimizer?

I only sell two mods that controls the A/F ratio.

A fuel mod.

http://www.xt660.com/site/node/136

A O2 controller.

Can be bought via PM or off Ebay.

http://www.ebay.com.au/itm/130788019598?ssPageName=STRK:MESELX:IT&_trksid=p39 84.m1555.l2649

Dynojet sell a O2 Optimizer but it can only be bought with a PCV Power commander.

http://www.off-the-road.de/XT-660/XT-Power/Engine-Tuning/Intake/Power-Commander-XT660R-X-O2-Optimizer.html

Oh, then it was the O2 Controller I thought I was describing.
I think the dynojet stuff is a bit over priced, and you do good work here - and at ktmsmt.com (I'm thinking of the SMT as my next bike).
I was also thinking of trying the EJK EFI controller: http://www.kenma.com.au/electronic_jet_kit.html - interesting claims, and the fact that it is real world tuning (no dyno) and the price.

As you know from the SMT forum I do real live tuning on my SMR using Dynojets equipement then import the PCV map directly into the KTM's ECU, change the rev limiter turn off the O2 sensors & a whole lot of other stuff, this type of tuning is the future.

Live tuning can be done on the XT660 & the equipment is available I was persuing this avenue until I sold my XTX, in the end I could not go any further as Yamaha Australia stopped importuing the XTX & I wanted a new bike, I love my Motards & have moved on to a SMR.

This is the programmer that was used on the very first XTX ECU reflash where the rev limiter was raised.

http://www.aliexpress.com/item/Hotsale-Piasini-Serial-Suite-v4-1-master/566972809.html

Anyway we are getting a bit off track on the O2 sensor thread.

Kev, you are a wizard. The bike is excellent - standard intake/exhaust and still makes a huge difference - especially the snatching/surging. I'm singing your praise in the XT660 facebook group - hopefully you get some new customers.
Tax man likes me, so DNA 1 and 2 and I'll drill the airbox out.
Edit: For anyone interested ... I bought (from Kev) both the Fuel mod (set to 1 o'clock for now - because no air/exhaust mods yet) and the O2 Controller (see picture - I didn't want to impede the fan and ... OK, I was bored, so fabricated a mounting bracket for it).

Thanks for the feedback glad you are happy with the results, I know the surging used to drive me around the bend.

The mod is pretty dead at the moment we will see what the next few months bring.:glasses2:

Not much take up on this mod you guys must love the surge. :rolltfl::rolltfl::rolltfl::rolltfl:

Re: O2 sensor eliminator mod (By Kev with the help of dazmatic)
 

Any difference in the final ratios between this mod and the older loopy pipe mod?

Hey Kev, certainly not enjoying the surge! It wasn't evident before installing the MM 2 into 1 exhaust, now it is downright horrible.

:sad2:

Seeing as I have some other questions, I started a new thread.

:100:

Re: O2 sensor eliminator mod (By Kev with the help of dazmatic)
 

How you are not selling more of these ill never know.

Along with the fuel mod both mods together turn the bike around and stop 99% of the surging.

Ive owned 3 xtx and never had the o2 or fuel mod on any why i didnt buy them sooner ill never know :).

Anyone thing of buying 1 dont think just do it you wont be dissapointed :D

Sent from my GT-N7100 using Tapatalk 2

The older 2010 O2 eliminator turns off the O2 closed loop circuit & the ECU only runs in the open loop state, so the A/F ratio is determined to what ever you set it to with your fuel mod.

The latest 2012 O2 controller keep the A/F ratio around 13.6:1 in the closed loop & a fuel mod or Yamaha's pre-mapped mapping will set the A/F ratio in the open loop.

Thanks for your feedback mistman.

I'll second that!

X, R or Z - it doesn't matter - you will feel the benefit.

Hiya Guys good work as ever!!! Sorry I just found this thread and I wanna know how much do I need to send to whom to get this O2 Controller please?????????????

Send Kev a PM to start the ball rolling.

They can be bought off EBay

http://www.ebay.com.au/itm/Yamaha-XT...item1e77c5c493

Or via PM.

Cheers
Kev

Kev - received and installed on the XTR 5 minutes later. That must be a record for the quickest upgrade to a bike ever!

:respeck:

The result, fantastic and immediately noticeable. I'm happy to add my name to the long list of those that recommend this device.

:applause:

Combined with the fuel mod, the bike is much nicer to ride at slower speeds and also down low in the rev range for each gear. Exactly what I was hoping to achieve!

Cheers,
Dale

Thanks for your feedback Dale, glad you are happy with the results.:coolsmiley:

Hi Kev,

Just ordered (ebay) the O2 mod... Looking forward to surge free riding on my 2010 bog standard xtx!

jc

Hey Kev

I have been through this thread with interest, but I still have some - probably quite dumb - questions. I have 2011 XT660Z with DNA stage 3, LV exhausts, PCV and drilled throttle body. Would you recommend O2 optimiser for this set-up - do you think it will make noticeable difference in the running of the bike? If I understand explanation few pages back, it should at least adjust the Close loop regardless of the add-ons so my guess would be that it should.

Another question - the bike runs quite well with the mods, but is noticeable chirpier and smoother in cold air temperatures and more sluggish and rough at higher temperature. Would this mod help with making it more consistent, or do I need to do something else - some kind of booster plug that will trick the temperature sensors? As I said I have already PCV on the bike and the bike was dynoed by Freez (but before the throttle body drill).

Thank your for feedback.

In the closed loop mapping there are only 2 mods that can adjust the A/f ratio & they are Dyno jets O2 Optimizer & on my 2012 O2 controller.

A PCV will have no effect on the mapping in the closed loop, so adding the mod will not affect the PCV map at all. Fitting one of the O2 sensor controlling mods will smoothen your ride when you are on the cruise & light throttle openings.

If you have fitted a bored throttle body after the custom map the A/F ratio will now be lean & will require a new map.

Anyone want a O2 controller mod?

http://www.xt660.com/showthread.php?p=189638#post189638

Hey Kev, looks like the Nuda might suffer from this as well. I might be getting one (Nuda) - just looking at the forum and there is a topic on it 'hunting'. Rode one yesterday ... no hunting, but they say it starts after a while.
I'll be up in Brisbane soon, you near there? Maybe sort out a version for the Nuda?
Doesn't seem to be a DynoJet O2 optimizer for it.
I know it worked a treat on he XTX

If the Nuda has a 4 wire narrow band O2 sensor my O2 controller will work. The latest bike to add to the O2 controller collection is the 2012> KTM 690 Duke's http://www.ktmforums.com/forums/duke/17290-2012-690-sd-o2-controller-mod.html

Can you send me some detailed photo's of the O2 sensor plugs I need to see if I can get the OEM plugs + need to see the pin locations of the wires PM me your Email address & we will talk further, I am always looking for new challenges, I am in Brisbane if you know of anyone with a Nuda tell them to contact me.

Great - good to see you're busy.

Don't know if this will help, but the Nuda motor/chassis is based on the BMW F800gs, so I imagine the connectors will be the same.

I'm 1-4 weeks off getting my Nuda (can't wait) but I have posted in the forum asking for pictures - http://www.nudaforums.com/forum/show...ng-at-low-revs. If worse comes to worst, I can go into the dealer and ask to have a look.

I might be coming up to Brisbane but I am 2-3mths off moving (also could be Cairns or Townsville, depending on work) - definitely QLD though. So over Melbourne (from Sydney)

I am intressed in this mod.. Where can I buy it and what's the price?

I assume that My xt660x 2007 has an O2-sensor? Is the o2 sensor the same as the lambda sond? I have a connection for something like that on My left exhaust-pipe.. Is this the o2-sensor?

I want My bike less jerky in lower speeds..
I have BSM slipon, K&N-filter and a GPR powerjet..

Thanks in advance!

Ja o2 �r syre dvs syresensor har din -07

Sorry took this in my language forgot how to spell 02 :)

Skickat fr�n min GT-I9100 via Tapatalk 2

The O2 controller can be bought off Ebay or via PM less Ebay fees. If you want the cheaper version PM me your email address & I will send you an invoice.

The O2 controller is explained here.

http://www.ebay.com.au/sch/7416kevin...p2047675.l2562

After receiving the O2 eliminator, it took 10 minutes to install it. The bike, XT660ZA, runs much smoother en is it possible to "take" roundabouts in higher gears. Surging is almost gone, and i am happy with the results.

Thanks for your feedback.:wave:

Little question, is the eleminator heatproof? I mounted it almost against the engine, therefore is gets rather warm.

It will be fine.

With the MT-03 O2 controller mod coming on board I am fresh out of O2 controllers, a guy in Italy bought my complete stock so I have no more at this stage for sale. I hope to have some fresh stock in within 10 days.

I have 4 XT O2 controllers reserved for guys & if they have not paid up in a few days their mods will back up for sale.

Hi Kev, if one of those 4 comes free in coming days count me in. Otherwise PM me in a week or two when new batch is ready please....

Cheers,
Nate.

The 4 X O2 controller invoices expire tomorrow night Oz time, if they are not paid for by then they will all be up for sale, sorry guys I put these mods a side for you while waiting for payment & have some guys waiting for the mods.

You would be surprised how many forum members ask me for the forum discounted price & to send them a PayPal invoice & they don't pay within the 5 day invoice time, I put 5 days on the invoices because of this, EBay is so much easier.

Hello Kev.

Let me know if one of the 4 O2 controller comes available sooner than the 10 day you have quoted me.

Cheers Gary