How do I fix the surging on my XT?

... is a question that is asked time and time again. So, to make life a little easier for everyone, I’ve put all the links to surging fixes and help in one place for easy reference.

Most of the mods listed below apply to the R and X models, which suffer the worst from this issue, but several are relevant to the Z as well. Many are cheap, and some don’t cost a penny to carry out; they are all relatively simple to do with basic tools and skills.

Just remember, that surging cannot be totally cured, particularly on bikes from certain years, but it can be improved considerably and almost totally eliminated on most models.

Join XT660.com supporters to access the “Ask Kev” 1:1 technical help section and access the free official Yamaha service manual for your bike: http://www.xt660.com/payments.php

Check you haven’t got a dodgy TPS (early bikes): http://www.xt660.com/showthread.php?t=948

Check you haven’t got a dodgy ECU (early bikes): http://www.xt660.com/showthread.php?t=519 & http://www.xt660.com/showthread.php?t=8546 (How to recognise different ECUs)

Twist-grip mod: http://www.xt660.com/showthread.php?p=154983

Cush drive rubber mod: http://www.xt660.com/showthread.php?t=12422

Adjust your CO: http://www.xt660.com/showthread.php?t=55

Adjust your TPS: http://www.xt660.com/showthread.php?t=56

Kev fuelling mod: http://www.xt660.com/showthread.php?t=194

O2 controller (If you have a later, post 2007 bike with an 02 sensor fitted): http://www.xt660.com/showthread.php?t=14746 (Current version explained from post #165)

Before attempting any of the above, make sure you bike is properly serviced, with a clean air filter, good correctly gapped spark plug, a tankful of fresh fuel, idle speed correctly adjusted to 1400-1500rpm and the correct chain slack.

In addition, have a read of the complete list of modifications available for the XT by clicking here.

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Nice work.

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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 /
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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