Date: 19-09-17  Time: 14:26 PM

Author Topic: 2000 FZS 600 runs lumpy after a trip to the Alps  (Read 109 times)

redmandan

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2000 FZS 600 runs lumpy after a trip to the Alps
« on: 13 September 2017, 08:26:18 PM »
Hi guys


Been lurking as a guest for a while but as I'm about to take the bike to bits I thought I would ask some advice to make sure I'm on the right track:


Backstory:
English guy living in Belgium, passed my test about a year ago and bought a fabulous 2000 Fazer with 42000 km on the clock for what I thought was a great price. Rode it to the Ardennes, rode it to work, rode it every time I could, it started up great every time and had me smiling from ear to ear. A big group of us planned a longer trip to the Alps so I prepped the bike with new tyres and a small service (oil change and once over from a local guy).


On the trip everything was fine until about the third day when we were at the base of the Alps. I had been putting the cover on the bike at night but regrettably I didn't do it this time as it was such good weather when we went to bed, it chucked it down all night. Went to start the bike in the morning and it was not raring to go like normal. No low end power, revving the engine just to keep it going, petrol smell from the exhaust. I adjusted the idle screw so it would run and made my way, albeit cautiously, up the alps in the continuing rain and heavy traffic. It was horrible bunny hopping round the hairpins. After about 3pm it got warmer and sunnier, I started to notice she was running a bit better. After stopping for fuel I hit the start button and it sprang to life like I was used to! Self healing bike!

On the trip back it rained again and all the old problems came back. What a bike though; it still got me home. It still has the same problems after sitting on the drive under cover for a few days, weather has been sunny with intermittent heavy showers. It will run if I turn it over for a good 10 seconds and give some gas but it doesn't want to keep running.

I suspect it is the coils as the exhaust for cylinders 1 and 4 get hot but 2 and 3 don't. I've been reading that 2 and 3 are on one coil whilst 1 and 4 are on the other. I also suspect the carbs need cleaning as petrol pours out of one of the overflow pipes when it is running. If the pilot jets are blocked this would explain the cold exhausts and bunny hopping at low revs. I have been reading pointer2null's post (http://foc-u.co.uk/index.php?topic=91.0) about carb balancing

Jobs:
Remove tank to get at it
Check coils: Can I just swap the HT leads from 1 to 2 and 3 to 4 to test them or will they not fire at the right time?
New spark plugs all round
Check compression
Adjust valve clearences
Remove carbs and give thorough clean
Balance carbs
Replace the rubbers: I originally thought this might be the problem as they are all cracked and split
...

Anything else I might have missed let me know

bandit

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Re: 2000 FZS 600 runs lumpy after a trip to the Alps
« Reply #1 on: 13 September 2017, 09:13:35 PM »
Hi, when you left the bike uncovered was it on the side stand?, if the drain holes on the cylinder head are blocked water can lay in the spark plug holes causing a misfire, dry & clean around the plugs use compressed air through the drain holes & around plugs,don't wont any crap dropping down the holes if you remove them also check plug caps are dry to. You can always switch plugs around to see if problem moves to another cylinder,a failing spark plug would be wet with petrol.       

redmandan

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Re: 2000 FZS 600 runs lumpy after a trip to the Alps
« Reply #2 on: 13 September 2017, 09:38:26 PM »
It was on the centre stand as I had oiled up the chain that evening. Thanks for the advice though Bandit I will check that when I get the tank off. Just need to find time and suitable weather....

fazersharp

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Re: 2000 FZS 600 runs lumpy after a trip to the Alps
« Reply #3 on: 13 September 2017, 09:43:20 PM »
(sigh ) oooook
Runny lumps after a trip to the Alps ---------------was it something you ate.
There you go - carry on - as you were 
I don't do rain or threat there of. dry rider only with no shame.

His Dudeness

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Re: 2000 FZS 600 runs lumpy after a trip to the Alps
« Reply #4 on: 13 September 2017, 10:19:50 PM »
Running poorly after rain is usually water getting in around the spark plug caps and then you lose spark due to arcing to the engine. If you've still got the original Yamaha spark plug caps it's probably time to change them. There's an NGK cap SD05F  that will work on the Fazer and they are very cheap so well worth getting. That should solve most of the running problem. If your carbs are over flowing it's probably a float valve, float height, float seat or o ring under the float valve seat that is the problem.

Disorderlypunk

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Re: 2000 FZS 600 runs lumpy after a trip to the Alps
« Reply #5 on: 13 September 2017, 10:45:13 PM »
as for replacing the rubbers mine are cracked on the outside but absolutly fine inside
so its most likely just for asthetics but at £90 a set mine can stay cracked
i read somewhere that the rubber inlets are made of two different rubbers and its only the outside that reacts to the heat but weather thats true or not i dont know


as your problems were mainly in the rain i would certainly be replacing the plug caps first with the SD05F remember to snip a little cable off the ht lead (i just took 10mm off) and check all the drain holes from around the spark plug are clear (mine were full of crap when i got it)

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