FZS600 - No power, won't go faster than 50, engine not smooth

[Paul]

Have you tried by-passing the fuel pump and fuel filter yet?

[CRH]

if the sliders are sticking?....that wont help matters!!

[Torque]

have you chkd the diaphrams in top of carbs?..ie, for splits or holes etc?....also make sure sliders are moving freely?....

They are fine, sliders move freely.

Choke's not stuck in the "on" position is it?

They are not stuck. It's fine.

Have you tried by-passing the fuel pump and fuel filter yet?

Yes. Did not help.

Have you checked the air filter? Sounds like classic symptoms of a badger in the airbox. I'd check the airfilter and if its ok clean the carbs.

Not yet. Thanks for advice. Definitely will do it tomorrow.

This still sounds like fuel over or under supply or air starvation to me.
Are the plugs sooting up? Check the fuel levels in the carbs by opening the drain with a length of transparent tube attached in a "U".
Have you checked the air intake is clear?

When I changed plugs. Old were suprisingly clean, so it's like under supply or air starvation?


Assuming:I've dismantled carbs, cleaned with some Halford carb cleaner and screwed them back.
However I was fighting almost 2 hours to fit them on bike and it's f**** hard to me.

First I've spent almost 30 minutes on connecting throttle links.
After that about 1 hour fitting carbs into airbox rubber gums then still did not manage them to fit into engine.
I think also that doing that on the cold evening does not help, since temperature make that rubber not soft enough.

I don't know what's the easy method to do that? Maybe use some soap/oil to fill the rubbers from the inside?


However seeing above advice, will check the airbox when carbs are fitted properly (hopefully)

[dBfazer600]

Had same problem refitting carbs tonight.

I put the support bracket on that holds the coils, fuel pump and filter. I then use minimal amount of carb cleaner sprayed onto metal carbs and used a screw driver to jimmy from the support bracket and it slipped in solidly.

Check that none of the rubber connections are cracked/split and do the everything up tight. after replacing everything I turned the ignition on twice before firing her up. The fuel pump clicked less the second time I primed the fuel. Bike started like a dream and then I adjusted the idle.

I only ran the bike for 5 mins as my water level is lower due to working on the carbs. So in the morning I am flushing the coolant and adding new. I also replaced my air filter with a K&N.

I noticed when I clean my carbs I had a black sooty substance in carbs 2 & 3 and put this down to the U bend filter that I also used carb cleaner on. I did leave this for 7 days to dry out

Hope you get her fixed soon mate.

Daz

PS make sure the you have tightened up the air box

[CRH]

also chk that none of the inlet rubbers are folded in on themselves after you put carbs bk on?..someone on here had that problem?.....plus did you chk those diaphrams?

[darrsi]

also chk that none of the inlet rubbers are folded in on themselves after you put carbs bk on?..someone on here had that problem?.....plus did you chk those diaphrams?

That'll be me  :'(

[CRH]

YEP!!....it was him above"...remember now :lol .....

[Torque]

[...]Bike started like a dream and then I adjusted the idle. [...]

Hope you get her fixed soon mate.
Daz

PS make sure the you have tightened up the air box

I am glad yours fixed.
BTW. Did you adjust idle jet? Mine were 4 turns unscrewed, so I've made them 2 turns out (start position for further adjustments) instead.

[quote author=CRH link=topic=10534.msg112237#msg112237 date=1383982292]
also chk that none of the inlet rubbers are folded in on themselves after you put carbs bk on?..someone on here had that problem?.....plus did you chk those diaphrams?

That'll be me  :'(
[/quote]
Thanks guys. I will triple check everything. Of course don't want to repeat mistakes .
However if you do not make any mistakes, how do we learn and avoid them?


I wait till it stops raining, since don't have own garage. Cheers

[Torque]

OK so I have fitted carbs back. I've turned off then turned on the ignition twice, so pump built some pressure.
After igniting about 6-7 times for 3-4 seconds bike started to give some noise, then ignited, but only 1 and 4 cylinder were working.
I've checked and one of the coils was connected in the wrong way. After I've connected coil back, bike ignited on 4 cylinders.
However still issue exists.

So I have checked fuel level in float tanks in carbs. I've only checked 1,2 and 4 cylinder since could not fit the plastic hose because of starter motor (below the carb). Fuel level was fine.

I've also checked the air filter and it was not clogged.

I have no ideas what could be wrong. Bike starts and runs fine, but if you add gas quickly it dies.
I've also noticed that it runs much better when choke is enabled (you can add gas quickly and it won't die), so I think it's under fuelling?
I can't understand it how bike can run very fine one day and be not driveable the other day? I would understand if it started slightly stuttering, but this is terrible.

Basically I've gave up today and totally have no ideas about that.

[Ruby Racing]

I'm not an expert, but I think you may have some crap in one of the carb jets. Sorry if someone has already suggested this.

[Torque]

1. I don't have much experience, so if one cylinder it's not working due to carb issue does it affect other cylinders very much?
I thought that engine will still rev fine, but less power and some vibrations and different noise.

2. I've noticed that my carburetors have some kind of air hose:
http://postimg.org/image/6v0zxde45/

but it's not connected anywhere, should it be?

[wezdavo]

That hose coming from the fuel filter should return to the fuel pump....

Surely its not that as it  would piss fuel everywhere??

[Torque]

My fuel hoses are connected like: tank -> filter -> pump -> carbs.
I am pretty sure that this one has something to do with air, not fuel.

[wezdavo]

Net filter, number 37?

[CRH]

chk ..number 18...for rips,or pin holes!!

[wezdavo]

The more I read this I keep thinking "fuel pump", not delivering enough when its needed...

How do the plugs look??

[dBfazer600]

[size=1em]2. I've noticed that my carburetors have some kind of air hose:[/size]
[size=1em]http://postimg.org/image/6v0zxde45/[/size]

[size=1em]but it's not connected anywhere, should it be?[/size]

That filter just sits in that position and nothing is connected the open side. It has a metal mesh inside I took mine off and sprayed it with carb cleaner then left it to dry completely.

The jets you mention are you talking about the pilot screw jets? That sit on the under side of carb housing and is accessed with out taking the bowls of? If So I nipped mine up and then did 5 half turns that would equate to 2 full and 1 half turn. My number four pilot screw was no where near the other 3. So make sure they are all similar.

Unsure if it has solved my stuttering problem as I have not had chance to take it for a run. I also did a coolant flush and I could not believe the amount of particulates that I flushed out.

Daz

[wezdavo]

Pump info

[Captain Haddock]

You say the tank breather is blocked to stop it leaking, if air can't get into the tank fuel can't get out, try it with the cap open and see if the problem goes away.
Does it make a sucking sound when you open the cap?

[Torque]

You say the tank breather is blocked to stop it leaking, if air can't get into the tank fuel can't get out, try it with the cap open and see if the problem goes away.
Does it make a sucking sound when you open the cap?

There are 2 hoses, breath and drain.
[size=78%]I've got now drain hose blocked, but breath it's not blocked.[/size]

Net filter, number 37?

Right, I've got it, but was curious if it's connected to anywhere.

chk ..number 18...for rips,or pin holes!!

They look almost like brand new.