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I found when I had AFR values in my 0% throttle column on my PCV's Autotune, bike ran nice and idled nice.

Did give a load of closed throttle anomalous values though but it ran sweet.

Soon as I removed the anomalous values but left the idle ones in, the bike started to stall as it had no higher RPM reference point.

Till I removed them completely as it was a pointless thing to do in the first place and just wanted to see if I could map to 0% (which I could)

If you remove the side cover where you put the key in to lift the seat...lift your seat off the bike....to remove side panel..(two 10mm nuts), and pull it off the grommits, and pull the panel backwards to clear the two ears behind the petrol tank, you will see the ECU. Tell us the numbers starting 5VK..

Not experienced any stalling issues yet, so I feel a bit hard done by. :042::042:

Quote:

Originally Posted by Kev (Post 139435)

I have personally fitted & tested every XTX/R ECU that has come out from 2004 to 2010 models.

My present 09 XTX is fitted with a 2006 01 ECU, does not stall at all.

Past XT with 00 ECU, stalled from brand new, 2004/2005 model.

10 ECU, never stalled much, 2007/2008 models.

11 ECU stalled at times, 2009/2010 model.

All of these ECU's have different reasons why the bikes stalled, the most common problems are idle speed to low & CO to rich.

Kev, you mean people who are stalling need to reduce the CO?

Because I often read that at the opposite people try ton increase CO valors.

And is there a method to recover the initial value for an XTX? Because on mine I don't know if the precedent owner already changed it.

You can play with the CO up or down it may help depending where your CO is set.

The main problem is Yamaha built a over run fuel shut off in the fuel mapping with 00 & 01 ECU's, so when the throttle is closed & the revs are dropping it sets the A/F ratio to 18:1 + until 1750rpm for the 00 ECU & 2000rpm for the 01 ECU then it starts injecting again at those RPMs, if you are in that range & pull in the clutch lever in the clutch switch sends a signal to the ECU to start injecting this also caused a problem with cutting out at times when your idle speed is set to low. Adding more fuel in the zero zone from 1750 to 2250rpm range does not fix the cutting out, adjusting the TPS to 16 & setting the idle to 1500 rpm works.

With 10 & 11 ECU's the over run cut off was no longer used & they leaned the A/F ratio out to 14:1 when the throttle is closed all the way to idle, this also causes a cutting out problem. The solution for the 10 & 11 ECU s to add fuel in the zero to 2% zones from 1750rpm to 2250 rpm by 5%, this stops the 00 & 01 ECU's from stalling.

Thanks Kev, I read a lot of things on this issue but never so precise :)

Finally, is there a model of ECU which works without need of customizing?

I am going to check mine to see the version (my XTX is 2006).

Unfortunately it's very hard to find ECUs for our bikes, except ordering in Yamaha and being slaughtered.

Quote:

Originally Posted by Kev (Post 142569)

Hi Kev,

the solution you mention for 10 and 11 ECUs, to add fuel in certain rpm ranges - I assume it is not possible to do that without a power commander or some other third party device?

thanks,
bundziur