Hi all,
i'm new to the forum. Had my 1999 Fazer 600 for 4 yrs now. I gave it a service yesterday, plugs, air filter and new oil and filter. took it out today and it aint running right at all. Under hard acceleration it is losing power then as you roll off the throttle it seems to pick up again. I'm thinking it could be the park plugs but thought i'd stick a post on here for some much needed advice as going on a tour of Scotland next month.
Thanks in advance for your replies.
What make air filter?
More people are born because of alcohol than will ever die from it.
Don't think the oil level would effect running. Could be a dodgy air filter but maybe check the hoses around the tank for kinks
try putting the old plugs and filter back in and see what happens 
One, is never going to be enough.....
sounds like an air/fuel mix problem ,take the airfilter out and go for a run and if it gets worse its a fuel issue - as some one said probable a kinked fuel pipe but if it improves its the air filter restricting the airflow too much .
"Don't Die with Fun in the Bank!"
Are dodgy air filters common !!!
(07-07-13, 09:33 PM)littlejohno link Wrote: Are dodgy air filters common !!!
I had a cheap Hi-Flo filter that i felt wasn't letting enough air through.
And it wasn't until i replaced it for a K&N that i realised how ill fitting it was too in comparison.
It rattled about by a good 5mm whereas the K&N was a very snug fit.
More people are born because of alcohol than will ever die from it.
(07-07-13, 10:02 PM)darrsi link Wrote: I had a cheap Hi-Flo filter that i felt wasn't letting enough air through.
And it wasn't until i replaced it for a K&N that i realised how ill fitting it was too in comparison.
It rattled about by a good 5mm whereas the K&N was a very snug fit. ![[Image: hijack.gif]](http://www.fourdoorbronco.com/board/images/smilies/hijack.gif)
What symptoms did you get? I have one of those filters but have always had a hesitation when opening it up.
Mine bogs between 7ish to 10 now the old one had oil in as the bike was over filled when I bought it
08-07-13, 05:56 AM
(This post was last modified: 08-07-13, 09:42 AM by darrsi.)
(07-07-13, 11:05 PM)Lawrence link Wrote: [quote author=darrsi link=topic=8716.msg86349#msg86349 date=1373230931]
I had a cheap Hi-Flo filter that i felt wasn't letting enough air through.
And it wasn't until i replaced it for a K&N that i realised how ill fitting it was too in comparison.
It rattled about by a good 5mm whereas the K&N was a very snug fit.
What symptoms did you get? I have one of those filters but have always had a hesitation when opening it up.
[/quote]
From what i can remember it just felt like it was gasping for air, as if the filter paper was too thick.
These bikes generally run a bit rich anyway so starving them of air could well be a cause of a hesitation problem.
If you want a quick test, just take the filter out for 10mins while the weather is good and go for a little test ride and see if the hesitation goes away.
If it does then it's a K&N all the way! 
NOTE: This hot weather won't help matters if you have any breathing problems with an air filter.
More people are born because of alcohol than will ever die from it.
(07-07-13, 11:44 PM)Fizzy Pies link Wrote: when i changed my oil the bike ran shite between 4-8k, there was no power.
dropped it so it was 1mm above the lowest point on the sight gauge and it was like having my bike back but better.
That's a strange one. Does it burn oil?
Thanks to all for the advice so far. Going to try the air filter, checked for kinked pipe under tank and also may drop a little oil out.
Thanks again.
Don't drop oil for fun, just make sure it has the correct amount in it.
More people are born because of alcohol than will ever die from it.
Can anyone explain how oil level effects performance other than the obvious no oil or 5 litres too much oil :lol
08-07-13, 11:44 PM
(This post was last modified: 09-07-13, 12:52 AM by darrsi.)
(08-07-13, 09:49 PM)His Dudeness link Wrote: Can anyone explain how oil level effects performance other than the obvious no oil or 5 litres too much oil :lol
Too much oil burst my cam chain tensioner gasket after a heavy duty blast, other than that i can't see any issues?
That was 4 litres by the previous owner instead of 2.5.
Basically the bike had too much beer and was sick!
More people are born because of alcohol than will ever die from it.
Drooped some oil out of mine today and it is now working and running great yet again. I also put the old air filter back in so not quite sure which one cured the problem, should have done one at a time :lol
Thanks to all for the advice and suggestions.
(07-07-13, 11:44 PM)Fizzy Pies link Wrote: when i changed my oil the bike ran shite between 4-8k, there was no power.
dropped it so it was 1mm above the lowest point on the sight gauge and it was like having my bike back but better.
(08-07-13, 09:49 PM)His Dudeness link Wrote: Can anyone explain how oil level effects performance other than the obvious no oil or 5 litres too much oil :lol Something to do with pressurising the crankcase?
(12-07-13, 09:05 PM)nick crisp link Wrote: [quote author=His Dudeness link=topic=8716.msg86594#msg86594 date=1373316572]
Can anyone explain how oil level effects performance other than the obvious no oil or 5 litres too much oil :lol Something to do with pressurising the crankcase?
[/quote]
Maybe. You can't argue with results but I don't understand it
Just read a couple of articles on this, interesting, but not sure conclusive in this case. One result of too much oil is that you wind up with bearings/crankshaft sitting in oil, creating excess drag, thus reducing performance. However, all those moving parts sitting directly in the oil churn it up and cause it to foam. This reduces lubricating quality, actually decreases oil pressure, with resulting carnage. Horror stories of broken con rods, holed cases, spark plugs blown out etc! Surprised nothing blew out of the breather pipe tho'.
(12-07-13, 09:56 PM)nick crisp link Wrote: Just read a couple of articles on this, interesting, but not sure conclusive in this case. One result of too much oil is that you wind up with bearings/crankshaft sitting in oil, creating excess drag, thus reducing performance. However, all those moving parts sitting directly in the oil churn it up and cause it to foam. This reduces lubricating quality, actually decreases oil pressure, with resulting carnage. Horror stories of broken con rods, holed cases, spark plugs blown out etc! Surprised nothing blew out of the breather pipe tho'.
Interesting stuff. I don't know enough about how the oil circulates to understand what happens when too much is put in but I know you can wreck an engine with too much oil and I could see how you could have a drop in the power that it's putting out but you'd think it would effect the whole rpm range rather than between 8-10k or 4-6k. The circulation of oil is definitely something to look into though. An interesting area indeed!
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