I've recently purchased a 2007 (facelift) 660X and I'm having a few problems.

The bike starts and runs fine on tickover but it doesn't seem to pull clean through the revs, I can only explain it as having a huge flatspot?? If you give is some revs it will go through the flat spot no problem.

Also when its been running for about ten minutes it losses all power and won't start easily, when it does start it'll tick over then cut out if you try to rev it, if you don't rev it then it'll cut out on it's own after about 10 secs??

If i sit there for a few mins it'll finally start and run again.

I know all the usual issues they have as this is my 4th 660X

Any help would be greatly appreciated.

P.s the bike is standard with the exception of Pipeworx cans and snorkel removed

Does it have a power commander ? As I had the same issues but found I had wrong map for computer found another that worked better and solved my problem

Sent from my X10i using Tapatalk

That sounds to me like a TPS malfunction. (Throttle Position Sensor) Please speak to Kev and he can give you some pointers.

However to be able to receive Kev's one to one assistance you need to be an XT Supporter otherwise see if you can find the solution within our list of modifications as per my signature line.

Good luck

I have spare tps that i was going to try later

Thanks for your help

The faulty TPS range.

Any TPS below 46 is now in the faulty range, A1 or A2 versions included.

2009 > XT's now come with a different TPS again & it looks completely different to the one shown below.

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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

No it doesn't have a pc, I'll probably put kevs mod on the airbox sensor though

Sorry I forgot to mention that it all boiled down to a faulty plug cap/ht lead, not sure which one as I changed both.

Thanks again