Thanks Kev FYI
I have a -01 ECU and a TPS starting with 46, the local Yamaha dealer showed me the recall form for the TPS and it had a list of PN's, starting with 45, 46, 47... etc. Some where "good / new " some "bad / old ". Unfortunately I did not write down the list, but I can tell you 46... was a "good" one, 45 and 47 bad. Even with that checked I am still getting a very jurky throtle at low revs. I have adjusted the CO levels and that has make some improvments. I told the dealer I was going to try out your Fuel injection mod, but he said hold off until he had talked to Yamaha. Because he had been riding the xt660 2007 and that was not smooth either ( OS sensor type ). I will tell you if I get joy :)

Hi Kev,

I have an Oct 2007 XTR and it also seems to suffer from a severe case of surging ( fortunately no cutting out). I've read most of the threads above and realized that there is not a lot of information available for the later models. Do you have any new ideas for surging in these models yet?

I've just done a trip to Cape Town with the bike and man, I don't want to sell it because of this slight irritating glitch. Changes to CO1 settings didn't offer any real improvements.

If your 07 XTR is fitted with a Lambda probe or O2 sensor, this will be difficult to cure, however if it doesn't have that sensor then you can safely fit a Kev Mod and experience a surge free bike, in which case please PM Kev for prices and availabilty.
Thanks

I have been working on a solution for the 07/08 XT's for a year now & keep finding hurdles when I think I am close. We are testing a few different ideas around the world at the moment. So hopefully we will find a solution soon.

I just want to check are you saying if your bike was bought second hand and has no warranty, that my yamaha dealer , still has to replace the ECU even though i bought the bike privately. Mine has the old ECU in it and it fluffs out at low revs if you dropping down gears at a junction etc.

The ECU is changed for surging problems, the TPS is changed for stalling when slowing down pulling the clutch in & blipping the throttle.

Once a bike is out of warranty Yamaha are not obligated to replace any part, they will how ever look at cases out of warranty at their discretion.

If you don't have any luck with the dealer, send off an E-mail to Yamaha asking for assistance & describe the fault, do not diagnose it for them saying you want a ECU or TPS they don't like that.

As I said in one of your previous post today, if you don't come right come back to me.

Good luck.

I don't quite get it with the chassi number range. Can you guys help me?
My chassi number is VG5DM011-000007626 does this fall in the "bad" range? :team[1]:

DM011 as far as I am aware is a 2004MY VIN (XTR?)

I'd say a DM011 VIN would fall into the above catagory as it is most certainly before (or up to) the two VIN numbers listed above.

Safest bet would be to check the part number on the ECU to see if it one of the "bad" ones. It may well have already been changed for the updated ECU by Yamaha earlier in the bike's life?

Yea it's a XTR. The thing is that I'am thinking of buying this bike. I've asked the owner to check the part number on the ECU but he could'nt figure it out. He said it was 5VK-090, and then he could'nt se anymore. He is the 7:th owner of the bike and doesn't know much about its history.

He's only found part of the ECU code. He obviously couldn't see the end of it (which is the important bit). Ask him to look again!