i just my ecu changed this week end mine is a 04 xtx had the tps changed as a recall part at xmass made my bike even worse but now its like a new bike no cutting out n the power line is alot better( it not on or off no more)



pete

ok - so I bought my 04 XTX a few days ago - unaware of these ECU/Surging problems. I have noticed some surging and i've had the bike cut out on me twice whilst at traffic lights.

Thanks to the posts on this thread i've checked out my bike/frame number/ECU number and they fall into the range of faulty bikes.

My question is this - do I a) return the bike to the dealer and try to get a replacement ECU (probably at more expense or would this still be covered under warranty takingg into account its a 04 bike and 2nd hand to me?) and hope the problem is solved or b) invalidate my 3 month warranty by trying to up the CO2 level and doing some of the advised mods and hope this helps to solve it.
Any advice gratefully recieved!

Print the 2 attachments and go to your Yamaha dealer they should change your ecu under warranty. However if you have bought your bike 2nd hand chances are the previous owner has already done this, can you open your panel on the left hand side of your air box and read the ecu number? Then I can ask Kev if that is the new or old ecu.

By left hand I mean your left when sitting on the bike.

Cheers

hi mate - yes i've looked at the bike and here is the ECU number -
5VK 8591A-00...according to other members this is one of the 'bad' ones.
My frame number also lies within the range you said.
Thanks for your help on this...

mines an 04, 2nd hand & they sorted mine a few weeks back with no charge

Ok in that case then its definately one of the affected ones, so you need to go to your dealer and show thme the 2 attached memos.

Good luck

Cheers - something tells me i'm gona need it!
I'll let you know how i get on.

ok contacted dealer and they said they were 'unaware' of this so they've gone off to ring the warranty people to see if i'm telling fibs...lol

My dealer will not even bother ringing up Yamaha to check!!! Is there any way of finding out directly from Yamaha?
My ECU number ends in 00 and my frame number is within the affected range.
Z

What we have found out about our XT660 ECU's so far, there is 3 models ECU's currently.

2004>2005 part number: 5VK-8591A-00.
Known surging & cutting out problems. 2004 TPS recall must have a A2 stamped on the inside of the TPS, you have to remove the TPS to see the A2. ECU recall 2004, Yamaha supplies 5VK-8591A-01 to fix surging & cutting out problem.

2005>2006 part number: 5VK-8591A-01, known surging but greatly improved on, few cutting out issues.

2007> part number: 5VK-8591A-10 with lambda probe, awaiting feed back from owners on surging & cutting out.