Originally Posted by waynovetten (Post 232635)

At the risk of asking the obvious did they or you change the plug because while it does show all the signs of ECU mine had similar problems and i�ve Come across others the same they have a habit of eating plugs when they feel like it.

Originally Posted by waynovetten (Post 232646)

how much are they quoting you for a new ecu?

Originally Posted by nikroc (Post 232647)

does the garage actually know what they're doing?

Originally Posted by jimbobjimmy (Post 232649)

�800 plus but have found a place in powys called motomatrix that have confirmed that its the ecu so going down the route of finding a second hand ecu and having it cleared back to factory settings as i have the master re key to use and reset it to the my ignition. �120 PLUS ECU ,told not to pay more than �75 for used ecu.
Guys seemend very helpful and will also contact their contacts to help me find one.

Originally Posted by CaptMoto (Post 232652)

:hello: and :welcome to :660:

What is the year of manufacture of your bike?

The run of faulty ECU's went from 2004 to late 2006 until all subsequent production was fitted with an upgraded ECU. There is something else you need to check, in 2006 Yamaha issued a recall on a limited batch of XTX/XTR declaring a faulty TPS (throttle position sensor) which was not returning to a decent tickover on shut throttle. After that recall, everything was ok for most of those like me who had 2004 to 2007 bike.

But unfortunately Yamaha couldn't leave things as they were, in 2007 they added a Lambda probe (O2 sensor) connected to the ECU which made thing worst by stopping a Power Commander or any fuel mod to work, and that was when Kev, our in house mechanic guru, started to work on his new mod that included an O2 eliminator.

So we recommend you get one and solve all your problems.

To be precise if your bike is a 2004 - 2006 production all you need is The Kev Mod without O2 eliminator see this link https://www.xt660.com/home/kev-shop/#fuel-mod

If your bike is a 2007 onward production then you'll need also the O2 eliminator and that is included with the mod follow this link: https://www.xt660.com/home/kev-shop/...r-and-fuel-mod

If you want to go the Power Commader way and have your bike Dyno'ed by a qualified DynoJet Centre you will need to purchase a DynoJet O2 sensor eliminator otherwise the engineer will not be able to work out a map and the PCommader won't work without on a 2007 production model.

Hope that helps, but please if your bike is a 2006-2007 model give your chassis number to an official Yamaha dealer and ask them if your bike was within the TPS recall or not, and if it was you can demand a replacement because the recall was official in the papers.

Good luck

Originally Posted by CaptMoto (Post 232656)

Next port of call is to check your wiring loom (specially under the tank) for corrosion, water from the front wheel on these bikes tends to cause all kinds of problems such as corrosion on the wiring loom and any spike or shortage can throw off the sensor and the ECU.