2007/08 XTX with 09 ECU - .: XT660.com

dan07 · # 1 02-03-09, 01:51

The 2007/08 XT has a few limitations when it comes to fuel management, it is delivered with the 10-ECU and an O2 sensor. A device such as a Power Commander is therefore at current not an option to fine tune this setup. The surging on my bike (OZ release) was quite substantial to that extend that my local bike shop had a few non fruiting goes at it and concluded in replacing the ECU with the one built into the 09 model ending in 11.

The setup to this point included a stage 1/2 air intake modification with the snorkel used as a door stop, and some mucking around with the CO setting.

After the ECU swap over and a few minor CO adjustments the surging was better but still noticeable across the whole lower rev range. Another interesting behavior was at around 50km/h cruising speed a constant switch (on/off) would become audible and the bike would enter super surge mode. I decided to live with this (and only ever ride the bike in the red area) since the mechanics have tried whatever they can do to rectify this issue and the next step would have been to cut my losses and hand it back.

After this decision I moved on and replaced the exhaust with a 2 into 1 from MM ending in a Scorpion muffler. Again not as straight forward as I hoped to get it to fit to my XTX model (seems to be a bolt on exercise on XTR). I had to get a local exhaust specialist to cut, bend and weld a few things to get the system to fit properly and clear every obstacle in the way.

Now here is where it gets interesting, the new exhaust seems to have rectified a lot of the above issues and surging has diminished almost completely which sort of indicates that the factory exhausts are part of this whole problem. Another nice side effect is that the bike now sounds more like the old ones used to, you can hear the single cylinder again - and yes it is quite loud, which I consider important in daily commutes to get the attention of the car drivers.

I like the bike a lot now, it looks understated and lighter without the pipes under the motor, still a bit on the heavy side and therefore underpowered but other aspects such as handling (not talking race track stuff) is great, it's very easy to ride and supposedly cheap to keep going in the long run (we will see) all of which are important aspects when I choose this bike for an everyday bike.

Kev · # 2 02-03-09, 10:44

Thanks for the feed back Dan, I would love to try the 11, 2009 ECU.

Glade you have found a set up that works for you. My 07 surged no matter what exhaust system I ran & now have found running the 05 ECU fixed mine from surging.

The clicking noise should be from the AIS mine did it all the time with the 07 ECU & now the clicking noise has gone with the 05 ECU, I suspect different emission mapping.

One last question did you refit the O2 sensor into the header?

Great looking bike mate.

dan07 · # 3 03-03-09, 11:19

Hi Kev,

yes the sensor is in, I'd like to add that the bike needs to be warm before it performs well (no big deal in WA). I did follow your path of converting back to the 05 cable tree and ECU, guess it is the best option at this point to gain control over the fueling but I just wanted to see if the 09 would fix it... which on its own it didn't. I sent a letter to Yamaha Australia to "please explain" why they would release a bike with fueling issues in the first place - lets see if and what they have to say about this subject. I also did follow the European forums (german) but they seem to be at a dead end as well as far as this subject is concerned and are currently discussing your fixes ;-).

cheers, dan

Kev · # 4 03-03-09, 12:51

Quote:

Originally Posted by dan07

Hi Kev,

yes the sensor is in, I'd like to add that the bike needs to be warm before it performs well (no big deal in WA). I did follow your path of converting back to the 05 cable tree and ECU, guess it is the best option at this point to gain control over the fueling but I just wanted to see if the 09 would fix it... which on its own it didn't. I sent a letter to Yamaha Australia to "please explain" why they would release a bike with fueling issues in the first place - lets see if and what they have to say about this subject. I also did follow the European forums (german) but they seem to be at a dead end as well as far as this subject is concerned and are currently discussing your fixes ;-).

cheers, dan

I have been writing letters to Yamaha Australia for 4 years now, telling them what I thought about their XT's surging. I have had one on one armed combat with them, they know me well. They even bought a Kev Fuel mod to test, with no feed back from them.

There is more to the puzzle of these 07 to 09 fueling problems. I have recently found out that AIS is in the O2 Air/Fuel ratio equation. The ECU compensates it's readings when the AIS valve is open, so we will get a different A/F ration when the AIS valve is open to when it is closed, the ECU compensates it's reading when the AIS valve is told to open, this is more then likely why I have been having problems in getting the surge under raps.

We are still working on a solution.

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