Tea bag filter

[seth]

Just out of interest - how much fuel was in your tank at the time? If very low, it could be that the symptoms you had were as a result of scavenging, as where the pick up for fuel is towards the middle/front of the tank, under hard acceleration or if going up a steep hill, fuel goes towards the rear of the tank, so if low, can cause scavenging and thus a bit of overheating as the engine runs slightly weak due to slight fuel starvation.

If it was this and your plugs got a little too hot as a result, that could explain why it did what it did then and runs ok now.

The fuel pick up is at the rear of the tank but under strong acceleration you could still get fuel starvation on low fuel loads.

[KiwiCol]

It was at idle though Seth.  Mick didn't say anything about rough running at higher rpm, just at tick over.

[seth]

It was but it started after a high speed high revs run so thinking it might have a fuel starvation problem that's now cleared again .
I think both plugs and filters need a check over just to make sure everything is ok .

[gsxbarmy]

I'd agree and is what I was alluding to earlier in that I think that possibly fuel starvation when doing the run "cooked" the plugs at bit which left it running rough at tickover afterwards. Now everything has cooled down, things are back to normal. Although if what we are saying is correct, not sure how much longer the plugs may last

[Mick_J]

Thanks for all the input but the tank was full, hardly ever run the bike will less than half a tank and fill up every time I use it.

[Mick_J]

Replaced the coils and took it along the same private road and it worked perfectly, no coughing and spluttering at the end so I think that's cured.  I think that must have been my original fault a year ago but as I rarely run at high revs it has not been a problem, sorted now.

[Speedy1959]

I think you are so lucky having a handy supply of "private roads" ahem...
On a Sunday morning the group I ride with seem to find many "private roads"...

[Mick_J]

Well that didn't work out, bike is still doing it so it's out with the pump next to strip and clean it out.  I've changed plugs, coils, checked the timing rotor is tight and all connections are clean, I get no fault codes but the bike still runs rough and will not tick over every now and again 

[Mick_J]

Took the pump out and it was spotless, no crud in the tank or filter.  Cleaned it anyway and went out today, bike runs like a bag of shite.  On an open throttle it pulls well but on a closed or trailing throttle it farts, coughs and tried to die, have to rev it at light just to keep the motor turning, exhaust was all black and sooty when I got home.  Has anyone got any ideas on how to fix the bastard, I've changed coils and plugs, cleaned out the pump and checked all sensors, I have no error codes and it's driving me mad (er).

[froudy]

Not the clutch switch playing up is it?

[Mick_J]

No, I've checked that and the side stand switches.

[froudy]

No probs..It was just a thought

Hope you get it sorted.

[Andre]

Black soot indicates incomplete combustion to me. I know you changed the sparc plugs but what do  they look like now.  Signs of overfueling on one - maybe a stuck open injector. Checked the airfilter?

[gsxbarmy]

Given what else you have checked I agree with Andre - get your injectors cleaned and checked, not expensive, http://gsx1400owners.org/forum/index.php?topic=95.0

[Mick_J]

Well yesterday I took the bike apart and checked/cleaned everything relavent, disconnected all the plugs/sockets and cleaned all the contacts with contact cleaner and replaced the plugs.  When I took the plugs out they were all very badly sooted up as was the exhaust tail pipe which tells me the bike is running very rich confirmed by the economy plumetting to less than 30mpg.  Took it out for a test this morning and it was fine until it warmed up and then it started coughing and finally died as I pulled into my drive, quickly checking the tail pipe it was all sooty again.  This  suggests to me that the bike thinks everything is fine but the ECU thinks there is a need for more fuel which soots up the plugs and causes the coughing as the motor is flooding, full throttle stops this, so I am now looking at the temp sensors or ECU as I get no error codes but the ECU is pooring fuel into the engine.  I have ruled out plugs (replaced), coils (replaced) and injectors as all plus are equally sooty.  Will keep you posted but any help would be appreiciated.