About to look at a low mileage 2011 660r with view to buy. Does anyone know if the problematic XT surging issues have been sorted out by this year please?

I believe so, but no direct experience. For what it's worth, my 2006 is far better than the 2004 I used to have, to the point where I don't see any need to modify it. It's a little chunky off idle, but nothing you can't ride around and call it character. I think Yamaha improved the ECU over time, and I'm told that by 07 they had it sorted on the R, so I would reckon a 2011 would be fine. At least, that's how I would be approaching a possible purchase, i.e. not worried in the slightest

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XT660R (2006)
XT600E (1994)
Triumph Trident 750 (1992)
My blog: http://goingfastgettingnowhere.blogspot.com/

I recently bought a low mileage 2009 XTR, and the surging doesn't bother me. Coming from an inline four, I DO notice something odd holding constant speed in 2nd or 3rd around 30mph, but nothing that I would have commented on if it weren't for a million forum threads alerting me to a "problem". As Black Dog says, it's character!

I think it's easy to read about things like surging, buy a bike and then go looking for a problem. In reality, it's a thumper - it is what it is. Get it and enjoy it!

From what I understand, 2009 onwards has an "improved" ECU. My 2008 rode nicely, without significant issue when I test rode it. Then I changed the exhaust system which pronounced the issue to a state that made the bike less than enjoyable to live with.

However, should you find yourself in this position, there is a help available from the resident guru (Kev) on this forum. My bike is now (again) very enjoyable to ride, with the new exhaust.

Good luck!

The 11's still have a small amount of surging, you can always fit one of my 2012 O2 controllers which will stop 99% of the surging

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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

What's that then Kev? So much info to wade through, but couldn't find what you meant. Is it a difficult thing for someone with very basic mechanic skills to fit? Cheers.