my xt is one month old and since new has had a problem, on steady throttle it jerks kinda like fuel problem or the break is being applied on and off. i decided to wait until its first 1k service but they told me it was normal and was something to do with pollution levels. this does not sound true to me, i cant believe i now have to go jerking around roundabouts etc because of co2 levels.
anyone else had this problem, does this sound true to anyone ? thanks dan w

Firstly to

As to your surging etc - it is well documented and if you click on the multi-coloured Mods link in my signature below you will find a number of ways to reduce the problem.

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motonacio, thanks buddy for a reply, i am going to try the co2, really dont understand why yamaha can sell a bike new that jerks, going around roundabouts in the wet cant be safe when the bike is jerking. lets be honest a brand new bike should be smooth as silk.
thanks again for the reply, i will let you know how the co2 change goes.

Welcome to the forum mate.

You say you have a new XTR is it a 2008 model with O2 sensor on the left hand exhast pipe?

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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
[
My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946

hi kev, yes 2008 with sensor,

Yes they do surge, at the moment there is no positive fix. It is due to emission control, they run the motor lean on the closed loop circuit of the oxygen sensor when you are on the cruise & it surges. Try up your CO1 by 5 to 10 this may help in the short term. The CO2 setting will not adjust the fueling only the CO1 setting will work.

Step 1. Before turning the ignition on press and hold Select and Reset buttons, turn the ignition on and keep holding both buttons until you see the Diag screen appear.

Step 2. Press Select once to toggle to the CO MODE

Step 3. Press both Select and Reset together. Hold for about 3 seconds to enter co mode. The number displayed is the cylinder selected (genereric computer for all Yamahas) You need to select 1, Press select to scroll up and Reset to scroll down.

Step 4. Press both Select and Reset simultaneousley for a few seconds to see the setting for the selected cylinder. This number will be different on every bike and has no relationship to the mixture its just a number it can range from -128 to +128. Write down the number and keep it in a safe place in case you need to return to your original settings.

Step 5. Pressing select will increase the value (richen the mixture), pressing Reset will decrease it.


I have a fuel mod made right now for the 07 onwards XT's. It is just waiting for me to finish off the O2 simulator which should be ready in a months time hopefully. I am not able to ride my bike at the moment due to my leg being in a brace. I should be able to ride in 2 weeks time so testing will be done then & hopefully we will stop the 07 & 08 XTX/R from surging.

__________________
Click here to join the XT Supporter's scheme

Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
[
My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946

ok great thanks kev, will try the co1 setting as above, hope your leg gets better quick, thanks again mate

and to

good luck with your surging problem, you know you will get help resolving it here in this forum but for any further assistance please click on the 2nd part of my signature re XT Supporter scheme which will entitle you to one-2-one assistance.

Cheers

Hi mate don't listen to the dealers crap take it back..... tell them that Yamaha will replace the ECU under warranty. Do not mess with the Co2 settings as this will only make the bike worse but never better. Had the same prob myself ECU replaced and turned the bike into a proper hooligan like it should be!

As an XTZ owner I am glad I havnt suffered these problems. But I think its crazy that Yamaha can get away with this. Yamaha Dealers seem to be under the impression we are all thick. I have had this attitude before from delears and I think its a real shame. I bought my bike from Tamworth but will get it surviced at Alf England as they seem to have a good reputation.