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- - Faulty ECU affected range ( https://www.xt660.com/showthread.php?t=519)

Quote:

Originally Posted by CaptMoto

This is exactly why our good Kev has had to resolve to designing a Modifications which is a MUST HAVE, just ask Skeeter, WheelieNice, tomr1992 and Laksof who had the pleasure of receiving one for free and their response was positive on all accounts.

Listen guys i don't make any money out of selling these mods i am only trying to help the community here, the Kev Mods are made and despatched by Kev in Australia, I can only suggest you hurry and buy one as there are 3 now available on ebay, bearining in mind that Kev can only make so many at the time due to his busy work.

Good luck

Just to set a few things straight, my mod increases fueling & with the airbox mod gives a smoother ride & better rideability. It does not eliminate the surging totally, not even a power commander can do that.

People must not get confused between surging & drive line shunt, that comes with a high torque, lean burn, single & twin piston motors.

Surging is like an elastic band effect, when the throttle is in a set position you get this light surging feeling. This can usually be fixed with fueling or ignition timing due to emission control or lean burn motors.

Drive line shunt as it is known, is the kicking & bucking of the drive line against the engine braking at low engine speeds. That's why you have cushion drives in the back hub to try to absorb this effect. This can not be fixed as it is a characteristic of these bikes.

Just wanted to update things and say thanks for the info.

PM from member confirmed my ECU was in fact a faulty one, dealer changed ECU and got back the beast today. I would guess its eliminated 75% of the problem and with a tweak on the CO setting another 5-10% like everyone has said it wont get rid of it all but its one hell of an improvment. Anyone that thinks their bike is surging bad really has to ride one without the ECU being changed to see whats its all about.

Dealer even said thanks for technical details enclosed in post as they had been scratching their heads over one that they could not sort, seems they have only sold a couple xt's and hand't seen the Yamaha document attached.

Thanks again everyone for your help.

Tiny

Where is exactly the frame number and the ecu one guys???I cannot find it!

Well i got it off the logbook, easiest place to look.

Can comeone else help me???

The frame number is stamped to the side of the steering head,the ECU number is on a sticker on the ECU which can be found under the black left hand side panel ,CHECK THIS LINK

http://www.xt660.com/attachment.php?...6&d=1153748325

Quote:

Originally Posted by CaptMoto

The 2 attached documents I have got from JMC are leaked internal Yamaha UK memos to all dealerships and service workshops.

They show the range of the faulty ECU's up to frame number related, best thing to do is to check if your frame number falls within this range and if so print these 2 documents and take them to your dealer and they shall have no problem in sorting you out with a new ECU

The quality is not perfect but you can just about make out the frame numbers. Sorry but this was obtained by a mechanic and not officially from Yamaha.

For the benefit of all please note these are the affected frame numbers

XT660R Up to frame no. DM015-007858
XT660X Up to frame no. DM014-006257

And thanks very much to JMC for helping me with this even though now you are on the other side of the world, its great that you kept these things safe.

Dear CaptMoto ,

As Tiny I have XT-R dated with 2006 year but with frame number string with 011 - that could mean the bike is actually 2004. I am about to have the first service, so would like to have the documents you attached while asking the dealer to check my ECU and replace it if necessary.

Do you have those documents scanned with better quality � I personally almost can read nothing from them.
Thanks in advance.

Thanks,
Lyubomyr Humetskyy .

Lubko

i really wouldnt worry when i went into the dealers the fact that i had the documents was enough for them to know they existed and went off in search of their own copy. For a proper Yam dealer they obviously have the access required to get to the original and from what they said once they expalined to the people that deal with the warranty claims what was happening they immediatley knew what the problem was.

Tiny

Quote:

Originally Posted by Lubko

Sorry but those are the only documents I have in that poor quality.

Quote:

Originally Posted by Tiny

Tiny,

Did the dealer have ECU in stock or it took some time until the new ECU were delivered to the local dealer?

You also mentioned that somehow you identified that the original ECU was the old one. How did you do that? By the ECU number that finishes with 0 or 1?

Lyubomyr.