Running rough.

[Kiwifruit]

Went for a ride with management on the pillion seat today. About 50kms into our ride and the bike starts running rough. It just wants to cut out and its hard to keep it running when changing down approaching give way or stop signs.
This has happened before but l have just opened the fuel cap and the problem has resolved itself leading me to believe it was a tank breather problem. Well today the problem plagued us all day despite continually opening the fuel cap.
Smelled hot when we stopped but pipe looks dark
Any thoughts please lads ?

[Blubber]

Bad fuel? Is in water contaminated?

[Kiwifruit]

Thanks Blubber. Will have the tank off this week and check for that and make sure filters are clean.

[froudy]

Check clutch switch operation..They can cause running problems if faulty.

[KiwiCol]

That's a shame Col, did opening the tank temporarily resolve it this time or just no effect now?

[Hooli]

Lube ya side stand...

I find mine gets slightly stiff & then doesn't fully seat upwards, which can mean the side stand switch is flickering on/off as the bike vibrates. As you know these bikes cut out in gear with the stand down so it can make them run rough. At higher revs they are smoother so it doesn't seem to happen.

I always give the switch a squirt too, as road dirt can build up on it's 'shaft' so it doesn't slide in fully as well.

[Eric GSX1400K3]

Id be looking at the sidestand switch as mentioned or the clutch switch if it got wet.  Check battery terminals too

[Kiwifruit]

Thanks guys will investigate those switches.
No change when opening tank cap Col.

[Horse]

Running rough and cutting out need definition ,not trying to be a smartarse its just that cutting out implies no fuel/spark and running rough , ie flooding/ missing on one cylinder is a different symptom  usually from my experience the clutch and side stand switch cut the ignition, the exception would be arcing which may give you what would I would describe rough running but with pipe looking dark , not sure how you pick that with unleaded fuel ? sounds like a fueling problem last time my bike had those symptoms it was a bad TPS anyway I hope this helps a little,

Have a good one ,
                            Horse

[Hooli]

Clutch & sidestand cut the ignition & fuel pump. But yes you'll notice the ignition cutting first.

[Kiwifruit]

We got home but l didnt enjoy being cruel to the bike. Lots of clutching to keep the revs up in slow traffic and to keep the engine running.
Most likely be the weekend before l get to look at things but am hoping its the sidestand switch.
Thanks for your input guys 

[DP1400]

Sounds like the exact same problem I had with my old Bandit `12, (however, it had been unused for a few months). Trim 5ml from the HT leads at the spark plug end. It turned out to be a 2 minute fix and the bike was running like new again.....gotto be worth a try on yours i`d think, assuming the side stand sensor is ok. 

[Kiwifruit]

First time out on the bike since my issue a month ago.
Cleaned the clutch and side stand switches. Bike ran faultless. Hopefully it's sorted. Thanks for the advice guys. 

[Kiwifruit]

Beautiful day today. So we set.off for Taupo about 9.30. Bike ran flawlessly until about 50kms out of Taupo heading home and it starts playing up again.
I pushed the sidestand down while going along and the bike totally cuts out when the stand is down 2 or3 inches so its not that.
The bike spits and farts black smoke so l'm thinking it has to be electrical.
So it's time for more investigation.
Thought l'd fixed it as it had run 60k on Tuesday and 170k today before starting to play up.
Now l'm grumpy   

[Eric GSX1400K3]

Black smoje = unburnt fuel, so either a cylinder isnt firing or the fuel balance is off.

Check your plugs, the blackest one will tell you more. Check the ht leads on that one  coil  pack and so on.

Then id be synchronizing the throttle bodies after checking the tps and stps readings.

Hope you get it sorted.