Hello
 

Hello,

New to all this so bear with me !

Formerly rode enduros in the 80's and 90's also like big singles (bikes that is !)
Had a XT600 Tenere a few years back and always liked the big Yamahas.


had a 2009 XTX for almost a year now and have fitted Kev mod and adjusted CO but can' t get clean throttle response coming off closed throttle entering corners. Very annoying as it upsets balance and also my confidence.
Waiting for kevs new plug and play O2 eliminator to make it the bike I always hoped it could be.

I have a Montesa 4RT trials bike with the most incredible accurate and responsive injection system you could imagine (think HRC moto gp technology in your own garage and you're somewhere near). If the XT could be set up like this it would be awesome.

:006: Welcome aboard oldf4art

Knackered cush drive rubbers on the XT can cause a very similar effect to what you are describing?

Is it a Repsol?

Thanks,

I did the old inner tube mod recently to tighten this up and was surprised how much difference it made. Also the amount of chain slack makes a big difference. The bike is better than it was. When I fitted MTC cans and K&N filter it was quite bad. Kev has a new "plug and play" O2 eliminator which I'm waiting for to see if I can get the last bit

No, not a Repsol. Too expensive. Chose to keep my 2009 and have an XT aswell !
The 2009 had a lot of upgrades which are not obvious until you ride it.
Repsol has a programmable ECU which you can plug into laptop and remap at your leisure - doesn't actually need it. If only the XT was this good. I'll keep trying.

And it's :hello: and :welcome: to :660: from me too

Hi oldf4RT and :welcome: from me, :newhere: too! I've got a 2009 XTX as well.
Have you tried adjusting your TPS yet? That may help a bit.
And what have you set your CO value to?

Ride it like you stole it mate:team[1]:

Welcome mate.

Kev,

Just so you know who I am, you just posted my plug and play O2 eliminator to the UK yesterday !

I thought it was about time I joined up !

CO2 value is up 25 from std.
Notplayed with TPS yet. One thing at a time is best I think.
I'm very hopeful Kev's new plug and play O2 eliminator (adjustsA/F) will do the trick.
I've done the cush drive inner tube trick to tighten things up and I know chain tension is also critical. (to my surprise).
I,ll update my details to show what I have on the bike.

Thanks everyone for making me feel welcome !

What does yours run like and what have you done to it ?

2009 White n red XTX, with Quill Evo2 cans, K&N stage 1 filter, and snorkel removed - that's how she was was kitted out when I bought her.
She runs real good at anything above say 5-10% throttle, pulls really strong from low down. But at slow speed and light throttle, especially in traffic, the glitchy fuelling became apparent.

Once I found out how to get into the diagnostics, I discovered the CO was set to 26, but never knew what the standard setting was. That sounded high to me, so I reduced it to 20 and immediately found a huge improvement in traffic. Tried further reductions to 17, 14, 12, but it made little further difference, it's now back up at 18.

On advice from local Yam dealer tech, I bought and refitted a snorkel, but it made things worse, not better! (That was before I discovered XT660.com!). The standard snorkel robbed the upper end of power (couldn't breathe properly). I subsequently modified the snorkel by shortening the intake and outlet lengths. The first iteration made the surging worse whilst still robbing top end, the second iteration (really short) has restored top end and cured the surging. I'd like to think the ultra-short version now fitted cleans up the air flow into the airbox, but I guess that's still open for discussion.

TPS was originally set to 16 at closed throttle - this was increased to 19. Apparently this should richen the mixture slightly, but it also means the closed-loop fuelling mode is exited earlier than standard at lower throttle openings.

Overall, the above mods have made a big improvement to the low-end response, but once out onto clearer roads the performance is excellent - I'm loving this new addition to my garage!!

Latest mod has been to add a Nitro-X fuelling module (similar in principle to the Kev mod) but I haven't had the chance to play with the settings sufficiently yet to determine the optimum value.

I shall be very interested to hear how you get on with the O2 eliminator mod!

Bit more background and some pics are in my introductory post here: http://www.xt660.com/showthread.php?t=19581

Cheers!
Dave.

Hi oldf4RT,

Let's continue our discussions in the Technical Forum here: http://www.xt660.com/showthread.php?p=178259#post178259