2003 Fazer bogging

[Andy_Pagin]

Background, bikes done about 45000 miles, serviced a few months ago, new NGK plugs, air and oil filters, carb balance checked and spot on, no problems.

A couple of weeks ago after a night of heavy rain I noticed the right hand plug recesses were full of water, so cleaned them out started up and the bike ran terrible for a few miles, sort of burbling noise, hesitating on acceleration then the power suddenly kicking in. After a while it settled down. Yesterday morning exactly the same scenario, but running fine by the time I got to work. However coming home after the bike's spent the day in a bone-dry car park it ran terrible the whole way home (about 12 miles).

Also I've noticed the exhaust seems a bit noisier than usual, it's got stainless downpipes but a factory end can which might be on it's way out, though I doubt that's causing a problem.

So could a couple of nights with the spark plugs immersed in rainwater have ruined the plug caps? Or just coincidence? My gut feeling is it's a HT problem?
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They're coming to take me away, ho-ho, hee-hee, ha-haaa, hey-hey,
the men in white coats are coming to take me away.
Yamaha Vity -> YBR125 -> FZS600 Fazer -> FZ1-S Fazer

[Baffler186]

Yes HTs could be the problem, there is a good write-up of how to recondition them on the Fazer forum somewhere. You could try that before buying new ones. I believe Bodyguard had success with this on his.

When it's idling, does anything happen when you twist and wiggle the HT leads ? They are hard to get at I know.
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Current: 2009 SV650 S, 1990 Kawasaki GT550
Previous: 2009 CBF125, 1998 GSF600, 2004 FZ6 Fazer, 1978 CB400a Hondamatic

[P.]

Rip out on of the plug caps and untwist the cap off the HT lead.

Check for corrosion in the cap and also might be worth checking the end of the HT lead, even trimming a small amount off might help.

[Beehive Bedlam]

[Andy_Pagin]

[Andy_Pagin]

[Beehive Bedlam]

[Tdibs]

This sounds exactly like dropping a cylinder, HT lead/plug is arcing to the head.
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Previous : 09 Vanvan 125| 02' Sv650s || Current: 1999 Xj600n | 1992 DR650 RSE | 2005 Fazer 1000

[Andy_Pagin]

Ok, I trimmed the plug leads, noticed that #4 cap is broken at the bottom and #3 was arcing against the head, gave it a damn good clean and the arcing appears to have stopped. Had a run up the A10 and it seems a bit better though not 100%. So it's going to be new plug caps. Anyone know where I can get a decent aftermarket set? I've heard Yamaha replacement cost £50 each .
____________________
They're coming to take me away, ho-ho, hee-hee, ha-haaa, hey-hey,
the men in white coats are coming to take me away.
Yamaha Vity -> YBR125 -> FZS600 Fazer -> FZ1-S Fazer

[Beehive Bedlam]

Link.

[Andy_Pagin]

Fitted the new plug caps, now running much better.
BTW the angled plug caps won't fit over the Fazers' timing chain caps, have to use the straight ones.
____________________
They're coming to take me away, ho-ho, hee-hee, ha-haaa, hey-hey,
the men in white coats are coming to take me away.
Yamaha Vity -> YBR125 -> FZS600 Fazer -> FZ1-S Fazer