Rough Idle on Fazer after rain

[snikks]

So, my Fazer was running perfectly yesterday, no issues at all. Got home, parked up, all fine. Over the rest of the afternoon and the evening, we had a couple of intense but short bursts of rain.

This morning I started it up, it starts Ok but is idling a little rough. I put this down to the engine being cold. Further down the street when I stop for traffic lights it's still doing it, and when I eventually arrive at work (should be more than long enough to warm it up) it's still doing it.

The bike seems to run fine as soon as a little throttle or choke is applied - smooth as ever and no apparent loss in power. However on idle, it feels a little like it's missing a beat, if that makes sense. The RPM is very unsteady, wobbling between 1.5k (which is where it's supposed to be) and 1k,

First thought is obviously that water may've got in somewhere it shouldn't, but I was wondering whether the specific symptoms pointed to anything in particular that the gurus of BCF might be able to suggest.
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- CBT: 02/01/11 Theory: 26/04/11 Mod 1: 19/05/11 Mod 2: 19/08/11
- 2007 Honda XL125V Varadero (Sold), 1999 Yamaha FZS600 Fazer (Sold), 2001 CBR600F

[temeluchus]

give the ht caps and leads a good spray of wd40.

drain the float bowls.

report back.
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Some shite cruiser. Now with guns and FREEDOM!

[herulach]

mine did the same thing when the plug caps need replacing.
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YBR 125>FZS600

[snikks]

Well it seemed to be running better by the time I got home, no more missing, at least. However unfortunately it's pissing it down AGAIN and as I have no garage to work in, there's no point getting the HT leads out and so on, as I'm more likely to put extra moisture in than get any out. So I settled for putting it under a cover tonight and hoping for the best.

If one was doing the same when the caps needed replacing, that suggests further that that's where the problem is, so I'll try giving them a squirt as soon as it's dry enough to be worth-while.
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- CBT: 02/01/11 Theory: 26/04/11 Mod 1: 19/05/11 Mod 2: 19/08/11
- 2007 Honda XL125V Varadero (Sold), 1999 Yamaha FZS600 Fazer (Sold), 2001 CBR600F

[temeluchus]

[Fizzer Thou]

Many plug caps are able to be disassembled and the internal resistor removed and cleaned,especially where condensation has caused corrosion.
Look up inside of the cap where it fits over the spark plug.If you see a flat blade screwdriver slot on the brass insert you can take that part out and clean the long spring and the resisitor element.

A few years ago I was 'making good progress' along a favourite section of road and the Exup1000 went onto three cylinders.On a machine like this you soon notice a drop in performance when this sort of thing happens.Once I got home I changed the plugs,drained the carbs,did a compression check,measured the high voltage coil output and all appeared okay.But the plug caps that I had checked,cleaned and reinstalled over the Winter layoff were the last things that I suspected.Once I measured the suspicious plug cap I knew staright away that the internal resistor had gone open circuit.As these are not available seperately I made up some short lengths of brazing rod and installed them instead and have had no problems in over 35,000 miles.
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Just talk bikes.What else is there?

Always have a 'Plan B'

[snikks]

Excellent, well I've given them a good spray around with WD-40, under the cover. As soon as dry weather presents itself (fat chance) I shall have a good look at them.
____________________
- CBT: 02/01/11 Theory: 26/04/11 Mod 1: 19/05/11 Mod 2: 19/08/11
- 2007 Honda XL125V Varadero (Sold), 1999 Yamaha FZS600 Fazer (Sold), 2001 CBR600F