Hello All, Another newbie in Gloucester
 

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! :D

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. :054: 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.
:smilies0349:

:006: 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?

:hello: and :welcome: to :660:

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:family::family::grouphug5:

Welcome to the fold buddy. Enjoy ur new machine!

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

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. :glasses2:
Cheers!

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 :660:

Hi Capt,
Thanks for the kind words, but fear not, I don't feel under any pressure, I simply meant that I've only been a member a couple of days, so it'll just take me a little longer a get "a round tuit", heh-heh.

The XT Supporters offers some excellent services and goodies (such as the photo gallery, For Sale ads, attachments to posts, not to mention the Forum Stickers!), so I'll almost certainly sign up before too long!!

Thanks a lot,
Dave.

:thumbsup[1]:

Hi and welcome, looks like you don't mind getting stuck in early on,

all the best

Hi guys,
A short update for any of you who may be following this thread. Well, I'm pleased to report that I installed the Nitro-X module last weekend, and it's working just fine and dandy. :D

I carried out a bit of lab-style testing before installation. Using a multimeter, I measured the resistance of the IAT (inlet air temp) sensor at several temperatures, cross-checked it against the sensor specifications in the Service Manual, then measured the resistance of the Nitro-X on various settings so that I could determine accurately what the "zero" setting was.

I was able to determine the actual values of the four on-board resistances and, with a little basic electrical theory for resistors in parallel, successfully proved and verified the other eleven settings available. (1/RT = 1/R1 + 1/R2 etc.)

Once the Nitro-X was installed, of course, you can just read off the temperature from the on-board diagnostics display (D05: Inlet Air Temp) which the ECU is being "fooled" into believing. All I need to do now is determine the best setting to use for my particular mods, which is the same as deciding what position to set the knob to on the Kev Mod. Unfortunately I don't have access to a gas-analyser, so it'll have to be seat-of-the-pants tests for me!

Would be pleased to share any or all of this data with anyone if you're interested, but I'll take it to one of the technical forums if you do - the Newbie's Lounge isn't the place for too much detailed info!

Cheers all!

:thumbsup::angel13:

Hi, and welcome :) waiting for your solution since i'm also not sure how far i have to twist that knob :)

Hi iShoe,
Still yet to determine the best setting for my bike, only had the chance of a couple of short rides so far.

If some more guys show some interest, I will as suggested, post some more detailed info in one of the technical sub-forums.

But if you can't wait, PM me and I'll spill the beans! :D

Cheers,
Dave.

Didn't post up any photos of my ride previously, but now I've got 'em onto Photobucket, I'll try the whizzy links trick to see if it works...

http://i247.photobucket.com/albums/g...Photo-0443.jpg
http://i247.photobucket.com/albums/g...Photo-0439.jpg
http://i247.photobucket.com/albums/g...Photo-0441.jpg

Sorry for the poor quality - they were taken on my phone-camera.

Oooohhh... that works fine - hey, they don't even look half bad!
Enjoy!
Cheers guys :)

Nice pics Dave, the bike is looking lovely!

Ais mod works very well. Did mine last week and stops almost all the popping. Block the pipe off at the airbox and re-fit as per Kevs mod' guide. much better - I don't mind an odd pop but it was too much before.


The CO number can be different for each bike and can be anywhere from -128 to +128. I know what mine was originally and have increased the value by 20. I intend to put it back before using the new O2 eliminator.

Made my own Kev mod with a 1k ohm resistor from Maplin. Total cost incl' housing box, knob and wiring was less than �5. Sometimes I think it works and some days not ? I believe you need to control the O2 sensor (not eliminate it) as this senses oxygen level and adjusts at low throttle openings whatever else you do so overrides everything else. I may not be exactly correct but I've thought i'd cured it a couple of times only for it to come back.

I also think that somedays being more confident (sub consciously ?) and opening the throttle earlier and slightly harder going into the middle of a corner might make a difference. Also and I know I've said it before but chain slack and loose cush drive rubbers makes more difference than you'd believe. Several other people have pointed this out to me in the couple of days since I joined the forum.

Good luck.

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"

Daver, i can wait for now since bike is kind of back to normal running :) Just a quick shot... do you guys feel like bike is kind of bad on colder days :) ? That got me to think i didnt put the mix by right proportions :)

Also chain slack would mean loose chain right? That could be one of issues when i think of it :/

Hi guys,

This thread is getting a bit technical and too detailed for the Newbies Lounge now, so I've created a new thread in the Technical Forum. Find it here: http://www.xt660.com/showthread.php?p=178259#post178259

I look forward to continuing our discussions there... :D
Cheers!