1999 Fazer 600 surging power

[fazerlad100]

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.

[darrsi]

What make air filter?

[His Dudeness]

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

[red98]

try putting the old plugs and filter back in and see what happens 

[ponkster]

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 .

[littlejohno]

Are dodgy air filters common !!!

[darrsi]

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.

[Lawrence]

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.

[littlejohno]

Mine bogs between 7ish to 10 now the old one had oil in as the bike was over filled when I bought it

[darrsi]

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.

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.

[His Dudeness]

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?

[fazerlad100]

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.

[darrsi]

Don't drop oil for fun, just make sure it has the correct amount in it.

[His Dudeness]

Can anyone explain how oil level effects performance other than the obvious no oil or 5 litres too much oil 

[darrsi]

Can anyone explain how oil level effects performance other than the obvious no oil or 5 litres too much oil 

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!

[fazerlad100]

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 
Thanks to all for the advice and suggestions.
 

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.

[Hedgetrimmer]

Can anyone explain how oil level effects performance other than the obvious no oil or 5 litres too much oil 

Something to do with pressurising the crankcase?

[His Dudeness]

Can anyone explain how oil level effects performance other than the obvious no oil or 5 litres too much oil 

Something to do with pressurising the crankcase?

Maybe. You can't argue with results but I don't understand it

[Hedgetrimmer]

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'.

[His Dudeness]

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!

[littlejohno]

I dropped 3.5 litres out of mine to take it to the Max I'd say there main issues for to much oil are blowing seals the risk of hydraulicking and possibly breathing so heavy it ruins on oil.
Luckily mine seems ok except the bogging fault

[Hedgetrimmer]

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!

A shot in the dark: Perhaps at lower revs, the drag is too minimal to create a noticeable difference. As revs increase, (speed of moving parts) so does drag coefficient, so performance loss is more noticeable. If you check back on this thread, Fizzy Pies doesn't say anything about problems at low revs when his was overfilled. Littlejohnos bogged higher up the rev range. Fazerlads initial post said it bogged when he tried to accelerate hard. All fit in with this idea. Of course, it could be complete b*****ks!

[His Dudeness]

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!

A shot in the dark: Perhaps at lower revs, the drag is too minimal to create a noticeable difference. As revs increase, (speed of moving parts) so does drag coefficient, so performance loss is more noticeable. If you check back on this thread, Fizzy Pies doesn't say anything about problems at low revs when his was overfilled. Littlejohnos bogged higher up the rev range. Fazerlads initial post said it bogged when he tried to accelerate hard. All fit in with this idea. Of course, it could be complete b*****ks!

I don't know could be right could be a load of horse manure  Are there any fluid mechanics experts on foc-u?

[JoeRock]

I would imagine that the higher the bike is revving, the more churned up and then frothy the oil gets?
Only thing I can think of!

[fazerlad100]

I don't understand it either just glad it's working again but I wish i'd tried one thing at a time rather than the both together then I would have known which one cured the problem. I suspect it was the oil though.
 

Can anyone explain how oil level effects performance other than the obvious no oil or 5 litres too much oil 

Something to do with pressurising the crankcase?

Maybe. You can't argue with results but I don't understand it