I have a 2010 660 tenere, bought from new and not messed with.
I have had the engine "miss a beat" after long rides at high speeds. Its like the fuel has been cut for one stroke and if cranked over on the black top it can be rather un-nerving.
This has only happened when l have been giving it the berries on the road for about 2 hours. If l back off for a while (cool down) it doesnt come back.
Is this just a heat problem made worse with hot air getting sucked into the airbox?
I live in Western Australia so its never too cold. It happened the other day at 18 deg celsius and 135kph for a few hours.
Could this be fixed with Kevs' fuel mod?
Thanks
Rod
Next stop - MT21's That will slow me down.

Hi there, first we need to give you the lowdown on what is happening with your bike, which is a commmon problem covering the whole XT660 range.

The issue is that these bikes come restricted from the factory to comply with government emission rules. Their first approach to restriction is to virtually choke the bike, by using a snorkle on the filter and a constrictly intrinsecate air box.

In few words the bike is starved of air flow, therefore there are times that when on either high revolutions or the opposite way on very low revs once the engine is hot, fuel goes to the combustion chamber without enough air to combust so to speak and that is when the "choking" occurrs.

The Kev Mod was designed by Kev (who is an expert Volkswagen Engineer Foreman in Brisbane Australia) to trick the ECU by altering the send temp of the AF thus allowing more fuel into the mixture. Way back since 2006 when Kev first introduced this mod it has been very succesfull and everyone who fitted one has praised the simplicity and functionality of it.

In addition to the Kev mod it is recommended to fit a DNA stage 2(3) airbox cover filter, which opens up the airbox to the much needed air that will allow the bike to have the intended air influx. That, together with the Kev Mod or a more expensive powercommander will make this bike a high performing engine as intended by its designers.

You can see details about this side cover filter on the link below, this filter was designed by Dino Nikolaidis, MD of DNA Filters Ltd, in collaboration with us here at specifically to modify / open up the airbox with a water tight safe to use high flow quality filter

http://www.xt660.com/site/node/324

Also check the fuel tank breather, could be kinked.

Also check your air filter is it blocked? New spark plug?

As the Captain mentioned you can get your beast to run much better with a bit more air & fuel.

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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

Thanks Guys very very much for a comprehensive answer.
Now where did l hide my credit card. Time to subscribe.
Filter was a bit dirty but not blocked, might have to look closer to find the breather, definatly need some more air.
Will get the fuel mod and some DNA Air as soon as l have paid off the $1000 l spent last week on parts and clothing.
Forma Adventure boots, very comfy.
Went fishing in my new Rally Cross Pro dacks today in the sun, plus 400k yesterday, love 'em.
Waiting for my crash bars, centre stand, rear brake leaver and high front guard from OTR Germany to arrive.
Thanks Guv, Kev.

Tried to subscribe with my AUS MC but got denied
Will try again tommorrow or await your command master.