Hi everyone,
I bought an 09 XTX just a few weeks ago and I'm lovin' it! Glad to have found your site I and look forward to exchanging some hints 'n' tips on XT ownership on here. I'm very impressed with the wealth of specialist knowledge on here, and I've only had a limited browse around so far!

Been ridin' bikes 35 years without any gaps; for the last couple of years I've had two big heavy bikes (a Suzuki GSX1400 and a Harley Fat Bob) but I've been missing having something light and chuckable to enjoy on the back lanes and in the traffic on the daily commute - the XT660X certainly fits the bill!

A few years back I had a couple of Honda XR400R's for green laning, but latterly I supermoto'd one and it was a total weapon on the road. Unfortunately it got stolen, so I guess I've been hankering ever since to get back onto something similar. I looked at the KTM 690 but it didn't quite gel for me. I didn't like the style of the older ones and the newer ones were too pricey. Then I test-rode my XTX and fell in love with it instantly. Just luuurve the instant punch from that gutsy motor.

I was lucky with my purchase, it's already got Quill Evo2 (titanium) cans on it, big-bore link pipes, and a K&N air filter.

On my test ride route I had lots of open road and little traffic, so I didn't notice the fuelling glitches that later became apparent once I used her at slower speeds and light throttle in traffic. Now improved a lot following a TPS tweak to 19 and setting the CO to 17-20, but there's still a noticeable glitch so I'd like to try and improve that further.

Sorry for the long intro, but thought you should know a bit about me!

Cheers all, look forward to chatting here on the forum!
DaveR.

Hello Dave and welcome aboard.

Sounds like you've done a fair bit of fettling already! May I be so bold as to suggest a Kev mod next, might just help with your fuelling woes?

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and to

Hi to Pleiades & "The Guv'nor" and thanks both for the welcome.

Yep, the Kev Mod was already flagged up on my radar of mods to investigate further, but actually there's a bit more background to my bike purchase which I didn't put in my introduction for fear of making it too long-winded...

Both my other bikes have after-market exhausts fitted, and I'm up to speed with the need to sort the fuelling accordingly - I have a Power Commander (III USB) on the GSX1400 and the SEPST on the Harley, both of which can be tweaked on the laptop.

So when I was into my negotiations the salesman before buying the XTX, I made a point of asking what fuelling mods, if any, were on the bike to make the best of the Quill cans and K&N filter mods. He didn't know off-hand, so we went through the paperwork that came with the bike (lots of receipts, always a good sign when buying a secondhand bike).

Well, there in the pack, was a fitting instructions sheet for a Nitro-X module, which I'd never heard of before. As you well know, it was full of bullsh*t about "programming" the module, trying to make out it was some kind of Power Commander-type fuelling device. However, satisfied at that point that the fuelling had been sorted, I went ahead with the purchase, and in the meantime did some hunting on the web for info on the Nitro-X. It was universally slagged off as a load of crap on most forums (always by those who had never tried it, of course!) and the rare occasions when someone who HAD tried it and had some success spoke up in its defence, themselves just got slagged off! Needless to say, I hadn't discovered xt660.com at that point!

Anyway, I bought the bike, and very quickly discovered the fuelling glitches at the low end (there were no issues when I was on the gas a bit more). So, I decided to check the current setting on the Nitro-X and have a play with tweaking it up and down a bit. But I quickly discovered there wasn't even one fitted!

Well, long story short and all that, the dealer agreed to get said Nitro-X for me free-of-charge 'cos it should've been on there as part of the deal, and I duly collected this just two days ago and plan to fit it this weekend. Since it basically works on exactly the same principle as the Kev Mod, I'll give it a whirl and see what it can do for the fuelling. If it's no good, then I'll probably go for the Kev Mod.

I know a Power Commander would probably do a much better job, however I'm a bit reluctant to spend �350 on a PC-V (which is over 10% of the price I paid for the bike!) when it's not actually running that badly anyway at the moment.

This morning I measured the resistances of the 15 different settings on the Nitro-X; it increases in nice steady increments from 1.25 k-ohm to 6.83 k-ohm. (NB: isn't the Kev Mod a 1.0 k-ohm pot?) Anyway - more of that later when I've tried it out.

I've also tried various mods with the snorkel; with it fitted as standard, with it removed; and with it modified by shortening it, in two stages. I can post some pictures of my attempts if you're interested. My local Yamaha dealer technician told me removing the snorkel would make the surge problem worse, but having tried it, I beg to differ; it was the first shortening mod that was worst. In other respects he knew his sh*t, it was his recommendation to increase the TPS.

A bit later, I also want to try the AIS-blocking mod which I've just read about on this forum - sounds similar to blocking off the PAIRS system on my GSX1400. And maybe after that I might go for the DNA Stage 2 airbox mod.

Anyway guys, better wind this up, it's turning into War & Peace!
Thanks again and look forward to exchanging more info.

Cheers!
Dave.

p.s. Not being a "Supporter" yet (gimme a chance!) there are a few links I can't access, including the ones showing how the Kev Mod is fitted. So is the IAT sensor connected in series with the variable pot, or does the pot replace the IAT sensor? Just wondered because it might be nice to retain the ability to sense the change in ambient temperature as well as off-setting the zero, rather than just having a fixed offset as with the Nitro-X. That may also explain the difference in resistance values?

Hi Dave get modin

FYI The current Kev mod is 0 - 10K ohms.

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Thanks buddy - that makes sense. Checking the service manual, I see the standard IAT sensor spec is 2.21 - 2.69K ohms at 20C. Being a NTC (negative temperature coefficient) device, the resistance rises as the temperature falls so we need a higher resistance to "fool" the ECU into thinking the air is colder and needs more fuel. Yep, that all makes sense now.
Cheers!

According to my Kev mod book the resistor is 1k ohm. On my bike that gives me 0 to -8 degrees air temp adjustment.

I think we need to move this somewhere else on the forum but not sure how. I'll ask my 16 year old son tomorrow - i can hear him even now - "give it here then - it's easy"

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White 2009 XTX. MTC Cans, K&N filter stage 1, DNA Stage 2, Kev mod, Co value +25 from std, New Kev O2 Controller, Dunlop Sportmax Mutant.
Montesa 4RT -best bike I've ever had by far !

3 teenage sons, 9 radio control models, Beta Evo 125, 6 push bikes - garage too small ! Not enough time to ride th' XT !

The older I get the better I used to be !!!

DaveR please don't feel under any pressure to join the XT Supporters, it is not compulsory but entirely voluntary. 1000's of technical data is accessible in this subforum http://www.xt660.com/showthread.php?t=630 so all you need is there, the XT Supporter scheme is for those who require not only one to one tech assistance from Kev but also need further access to other areas of the forum as explained in this thread: http://www.xt660.com/showthread.php?t=1475

Enjoy!

Hello and welcome to

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2011 XT660Z

2008 TDM 900