Hi All,

I have a 2004 XT660x with DNA stage 2 & 3 air filter, Kev fuel mod, MTC exhausts with baffles in. Been running fine but i felt it was possibly a little rich, so dialled it back from 6 -5 -4 o'clock on the Kev mod thing and felt it was a bit crisper. Anyway, rode it 30 miles home from work last night and it was running like a dream.

Came out this morning and pressed the starter and instead of jumping into life it just span over? So I thought perhaps I'd leaned it out too much and put it back to 6 o'clock. Stumbled it a bit but crept into life? Rode up teh road and it seemed fine, got to a junction and went to pull away and it died and wouldn't start again. Spins over fine but no signs of life. There is no back firing or anything, just dead?

I've parked it in the garden and will get into it on Saturday, any ideas on where to start, or has anyone else had this happen?

Many thanks.

First thing Id check is the plug..maybe have a new plug ready?..

Defo agree about the plug, and while it's out being checked/replaced reconnect it and check for a good spark .

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2011 xt660z.
Yoshimura cans ,kev mod,Dna 2, Stahlkoffer panniers,Hepco Becker box,Givi crash bars,Mita e07 tyres.

May I ask how long you have had the fuel mod fitted

Hi All,

Thanks for the replies. It came to me recently with the kev mod fitted and its been fitted for over a year with no problems.

Weird thing is, I came home from work tonight, stuck the key in and it fired up like it normally does, or did? I dont have the time to test it until the weekend and working intermittently is worse than a total failure to me, but I'll have to have a dig round it over Xmas.

I'll keep you all posted/ask for advice etc.

If the fuel mod fails the engine light will be on logging a fault for air temp senor.

Where is the CO set at in the dash? It should be around 10 to 15max.

How old is the fuel in the tank, how many kms since the last spark plug change, is the battery spinning the motor over at the correct speed?

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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