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Hi kawas Yamaha Australia informs me that there is a revised ECU. Your bike may have been fitted with one of these ECU's which has the old part number, this may account for your bike not showing any surging & cutting out. If it is running ok leave it alone. All the XT660 have a little surge so don't worry about it. Hope this helps you. Kev Letter from Yamaha Australia below. Kevin, some bikes in the recalled Vin range have the revised ECU under special part number 90891-30032. This part is the revised ECU but does not have the part number 5VK-8591A-01 on the casing itself. It also can be idntified with a white dot on the rear side of this remapped ECU. __________________ |
:) I'll look for this magic white dot then.
Take care! Edit: Entered diag yesterday - CO is at 28 - does it mean that someone lift it? |
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So i bought used xtr (2004.) my guarantee expired in march 2007... my dealer said that there is no chance yamaha will change my ecu at their expence, the new one cost somewhere about 550� and that is way too much for me, i had too many problems with my xt allready, cut outs, my trestler (i don't know if it's the right word) cracked... :sick[1]: There's one more thing that i'm interested... I don't know why is that but when i rev my bike and i squeeze my throttle fast bike is choking... Is it because of CO or what?? thanks |
Write directly to your nearest Yamaha head office & complain to them on the running conditions of your bike.
Explain that the cutting out is dangers & will cause an accident because as it can stall at anytime & you could be rear ended, tell them that your bike has a flat spot & surging badly. Advise them that you have approached the dealer with your concerns & they have not addressed them. Tell them if this problem is not repaired under warranty that if the stalling or flat spot causes an accident they will be held responsible because it is a proven defect & Yamaha Japan has issued a recall replacing all the TPS & ECU's on the 04 model under warrant. It worked for me. The flat spot you are talking about is a lean mixture & is quite common on the 00 ECU, increasing the CO will help but not cure it, fitting the 01 ECU makes a big difference to the whole bike. |
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Thanks a lot Kev, when i talked to guy in my service (who drives also xt 2005) he adviced me to change tps and that they will try to contact our dealer Delta team Kr�ko but he believe that i'll have to buy the damn ecu... The only bad thing is that my warranty expired almost 2 months ago... |
Even though your bike is out of warranty there is still a period of good will from Yamaha.
I would contact Yamaha directly & plead your case, as the bike being dangerous. If you go through the dealer you won't get your ECU. Contact Yamaha through their web page http://www.delta-team.com/ |
well i have an 2004 it surges so bad irs unridable, it even stalls between gears i had the ecu change and its made no noticable difference c1 is at 20 on co2 i brought the bike back to yamaha and told them i d be picking it up whenit fixed..
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i have both the bike came with 00 ending ecu and was surging and stalling between gears wich made bike dangerous when dowshifting from 3 - 2 as the rear wheel locks i had the ecu replaced under warranty with the ending 01 and its the same trouble its so lean the engine stalls it surges so bad my 6 year old daughter cant hold on and its stall without fail at low engine rpm whenever it can expecially if i am joining traffic so i am just waiting to be run over!!!!my 77 xt 500 work 10000000 better
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My stalling problem was 90% cured by upping the CO by 10 and upping the tick-over very slightly. The best thing to happen to my XTX was to have the TPS replaced. The bike is now much more ridable, still a bit surgey when cruising at slow speeds and the throttle now feels like I'm operating it and not something else.
I've spoken to 2 different Yamaha dealers and Yamaha Customer Services and they all told me that Yamaha thought they had fixed a problem with the XTX by changing the ECU but then realised that the problem was the TPS. Now the TPS has been sorted I can say the bike is much more fun to ride, not perfect but still good fun. I must just add that any speed above 40mph is absolutely amazing. It worries the plastic fantastic brigade in the twisties. |
There are two problems with the XT's one is surging & the other is cutting out.
The TPS was changed from a A1 to a A2 which has a different potentiometer scaling & better segments, there has been some further problems with the rubber seal on the A2 TPS which is to tight & is causing the bike to cut out, I won't go into the reasons with a big explanation. I have had the problem on my bike which has the 01 ECU & the new A2 TPS. I now have a fix if your bike still cuts out with the new A2 TPS. The ECU was replaced from a 00 to a 01 because of a lean mapping for emission control, on the 01 ECU they have enriched the mixture through the low to mid ranges. It is far from perfect but has an improvement over the 00 ECU. Even with a Power Commander the XT still has a small surge which is more of a characteristic then a fault. Adjusting the CO1 is only adjusting the mixture at part throttle, as soon as you open the throttle it runs on the fuel map. The only way to improve the fuel mixture is to fit a fuelling device that increase the fuel mixture across the whole throttle range. There have been a few other reported reasons why the XT has been cutting out, from the bike not charging correctly low voltage, to faulty temp sender readings. So all avenues have to be explored to find the problem as not all machines are the same. |
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