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+--- Forum: FZS600 Fazer (https://foc-u.co.uk/mybb/forumdisplay.php?fid=78)
+--- Thread: Im flumoxed (/showthread.php?tid=75788)
Re: Im flumoxed - taylor - 01-06-16
I notice you got a new engine, its not restricted is it.
Re: Im flumoxed - joebloggs - 01-06-16
If you had the issue before then I would definitely be pulling the carb tops off, my old 600R had a split diaphragm and it would pull hard in the lower gears then struggle once under load at higher speeds. It may not be that simple but an easy one to rule out
Re: Im flumoxed - grizzler - 01-06-16
joebloggs, diaphragms are a ok (checked when stripped n cleaned). She pulls up to 120 and my bottle goes before the bikes willingness to go faster..lol..
Just for a bit more info, i believe it's a fuel starvation problem because i have to prime the carbs again after she conks out. I just cant seem to find the reason the fuel doesn't flow fast enough at higher speeds as it's a hard thing to test at 80mph..lol..
Re: Im flumoxed - Arfa - 01-06-16
Hmm very odd, had similar symptoms with my wife's old zzr400. Unfortunately, I never did resolve it. :-( Does it only become a problem when. travelling at 70 odd? I mean when at stand still can you rev the engine to a similar point? If so, then this may imply it's related to air flow at speed, or the Speed/gear the bike is in. We always suspected the Jap imported zzr400 was restricted based on speed/gear (did try grounding wires from CDI), or the ram air intake.
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Re: Im flumoxed - Fazerider - 01-06-16
Maybe the fuel is getting restricted after the T-piece.
If you compare the flow rates you can get from the carb drains it might be possible to judge which one isn't filling as fast as the others. It takes a surprisingly long time to empty a float bowl so you'd need to let each one pour for a couple of minutes before making a measurement.
Re: Im flumoxed - robby boy - 01-06-16
Carb icing?
Re: Im flumoxed - unfazed - 01-06-16
Did you do the pump bypass yet?
Re: Im flumoxed - Bretty - 01-06-16
How do you know the fuel pump is in good working order? Could it be functioning ok electrically but have a mechanical issue?
To me it does sound like the pump is not keeping up with demand for whatever reason.
Re: Im flumoxed - Jules-C - 02-06-16
Did you check the pump output? They don't last forever and it's output is down it would only show up at higher speeds.
Re: Im flumoxed - grizzler - 02-06-16
I am just heading down that path as I seem to be running out of reasons..lol.. no idea how to check that so bought a new one. Awaiting it's arrival with worms in my mouth......... ( baited breath)...
Re: Im flumoxed - Paul - 02-06-16
Given that you've checked everything else, I'd bypass the fuel pump and see what happens.
It could be a faulty pump or an intermittent electrical issue.
Re: Im flumoxed - darrsi - 02-06-16
(01-06-16, 10:49 PM)robby boy link Wrote: Carb icing?
My bike suffered carb icing when I first got it, his symptoms don't sound like that.
Once the carbs ice up the bike runs like absolute shite, it wouldn't be resolved with a few on/offs of the key, the ice needs to be melted before you can set off again.
Re: Im flumoxed - robby boy - 03-06-16
(02-06-16, 11:06 AM)darrsi link Wrote: [quote author=robby boy link=topic=20224.msg233356#msg233356 date=1464817750]
Carb icing?
My bike suffered carb icing when I first got it, his symptoms don't sound like that.
Once the carbs ice up the bike runs like absolute shite, it wouldn't be resolved with a few on/offs of the key, the ice needs to be melted before you can set off again.
[/quote]
Ah good point, I have never had it but seen it mentioned and thought I'd throw it into the mix.
Re: Im flumoxed - unfazed - 03-06-16
Carb icing only happens in temperatures of around 4 degrees or less. It can happens from startup on the fazers until they reach operating temperature, but not after as the carb heaters prevent it. Some of the fazers came from the factory with a blockage in the coolant circuit in the carbs and are more prone to it, but is easily fixed.
Since the issue happens during a run of a few miles in excess of 70mph and drains the carbs it is most likely the pump that is misbehaving.
Bypassing the pump on a full tank of fuel is the easiest way to check a faulty pump if you do not have special pressure testers.
Re: Im flumoxed - grizzler - 04-06-16
The new pump arrived today and is now installed I'll get to test it tomorrow.. I'll let you know the outcome. ..
Re: Im flumoxed - Ferg - 05-06-16
Fuel pump?
Re: Im flumoxed - grizzler - 06-06-16
Ok.. so new pump is good and i can now cruise at over 60 with no problems... All is good... or is it? I'm sure that the pump is not supposed to be constantly pumping. Turn on the ignition and off she goes, pumping for England till what is assume is a timer tells it to stop. Now here's the killer. Press the stater and fire her up and the pump is going 10 to the dozen . Never slows it's rate n does not stop. When stationery it sound like the little ends are knocking g to come out. It wouls believe this is not good but for the fact that although it's pumping hard there is no leaking of fuel anywhere.. it's just like my luck to buy a brand new duffer of a pump but as it had to change the electrical conecter in can't send the bleeder back. But at least in know where the original problem stemmed from.. do these pumps have an internal presure sensor that makes them stop or is that controlled elsewhere? ?? Ps I've started a new whole in my garage wall...lol..
Re: Im flumoxed - His Dudeness - 06-06-16
I'm pretty sure all fuel pumps shut off with pressure. I'd try disconnecting the outlet from the pump. Put your finger over the outlet while it's pumping and it should shut off. If it does shut off then the pump is working and the problem is probably the float needle in the carbs not seating properly and the carbs are flooding. If the pump keeps pumping with your finger over the outlet then the pump is the problem. Be careful with the petrol
Re: Im flumoxed - unfazed - 07-06-16
Yes, the pump should cut out with time or pressure and you should test it as his dudeness says.
Out of curiosity where did you get the pump? There are a number of cheaply made rubbish pumps around and the fact it had the wrong connector should have aroused suspicion immediately
Since the pump is not an overly common fault on the 600 I would have risked a one from a breakers like Fazerspares in Bristol or known reliable breakers in you own area.
Re: Im flumoxed - grizzler - 08-06-16
I have tested as suggested and it doesn't stop.
But as I said there is absolutely no fuel leakage anywhere nor is there the smell of petrol. So although the pump is pumping enough fuel for me to ride happily at autobahn speeds it would suggest that it isn't actually pumping excessive amounts of fuel to overflow or even flood the carbs. Stranger n stranger...