Start with the basic's, replace your spark plug, make sure the bike has fresh fuel.

I've already tried a new Iridium plug and it has had tanks of fuel through it since the problem started.

Im going to clean the fuel system, test the electrics and go from there. Might even take the bike back to standard spec to rule out a problem with the pipes or power commander.

Thanks for all your suggestions guys, looks like I'm in for a busy week!

You could always ask advise from a proper dealer.......not the idiots that say everything ok guv......and to me it sounds like electrical rather than fuel so coil/plug/plus leads etc would be my first port of call. Good luck!!

Cheers mate

I took the bike to my local Yamaha dealer (Arnolds in Burton) the first time and they said there is nothing wrong with it! To be fair to them no fault codes were showing and the bike was running fine when i collected it from them. I have a couple of hours spare now, so will check over the coil, ht lead and plug.

I would pull the tank off & check every electrical connector, pull them apart looking for corrosion, also check the main wiring loop that runs under the seat to the battery we have seen the loom rub through to the frame & cause short to earth problems.

The loom looks fine to me. I do keep getting the fuel gauge flashing constantly since I put the power commander on, checked all the connections to it this afternoon and they seem fine. The underlying problem started way before the commander was added though.
I'm thinking of taking the bike bike to standard and going from there, at least it will eliminate the pipes, filters and PC from the equation. I've bought a new NGK plug cap and plug, just need a decent HT lead (any recommendations?). My plan is to ride the bike until it starts to happen, change the plug, cap and lead at the roadside and see if it helps. Cold and damp weather seems to increase the problem, I think it has to be electrical. Is it ok to put a bit of silicone grease in electrical connections to help keep damp out?

Thanks for your help Kev, this is really starting to get me down now!

Use a low suppressed HT lead, if I remember right I used a 2500k on my XTX instead of the standard 6500K ohm HT lead.

My 2007 harley was fitted with 'race tuner' fuel management system. I started experiencing stalling and general rough riding conditions which required several expensive visits to the dealer for a variety of misdiagnosis. To make a long story short, the race tuner was faulty and once removed my problems disappeared. You may want to swap out your power commander, just to rule it out as the source of your problem. I wish I had done that $ooner.

This sounds to me like a fuel pump issue. I have a WR250R (2012) fitted with the later pump, and it fails intermittently with exactly the same symptoms as your bike exhibited initially. Most of the time, the WR runs fine, which means no chance of warranty until it fails completely.

Pumps do fail gradually at times, and my 250 is like this. A Chinese pump is in stock here at home ready to be fitted. I bought a spare Tenere one too. Total cost: about $90AUD.

The Chinese ones come with a new in-tank filter, too.

Regardless of what your issue is, I hope you get it sorted soon.

Similar problems
 

Hello buddies ..
I've got similar problems with my XT660Z.
riding at low speeds with the engine warm, the motorcycle begins to choke, failing losing acceleration. at some moments at high, 6000..6500 RPM she cuts without at least reaching 7000RPMs.
coincidence or not, soon began when I changed the stock exhaust for a LEOVINCE, and the only change was to close the injection of air into the exhaust to reduce the levels of carbon dioxide.
what do you think?

P.S .: excuse the English, I do not have socializing
best Regards