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

[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 .....

[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.
 

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 

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]

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?

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.

[Markvanloock]

Have you checked that the exup valve moves freely? The 600s do have exup valves, dont they? I only picked up my gen1 1000 yesterday, so I'm very new to these, but my yzf750 had a stuck exup valve, and the symptoms were the same as you describe.

[red98]

no exup on the 600....another one to cross off the list 

[Torque]

I've left my bike for about 1 month, because was quite busy last time.

I've tried to run it today, so I've opened the fuel and switched ignition twice so pump could build up pressure.
I think that my mistake was that month ago bike ran about 1 minute without tank, so there was not so much fuel left in carbs.

Now before pump could build a pressure there was leak from 2 hoses coming out from carbs, so I think that float valve was opened all the time.
Since leak was not the only issue, because bike was not running good before I've took of carbs and going to do proper job again.

Last time I've used Wynns carb cleaner, but as you see that was not enough.

I think about buying ultrasonic cleaner, but my question is if I clean it with ultrasonic cleaner, rinse it, do I need to have a compressor to remove the water or I can just leave them opened for few hours/days and they will be fine? I can not afford right now to buy ultrasonic cleaner and compressor at once.

What ultrasonic cleaner do you recommend to buy?

[His Dudeness]

Is it really worth spending the money on an ultrasonic cleaner and a compressor just to clean one set of carbs?  Why not give the carbs to a proper bike mechanic let him clean and inspect them. I'd say it wouldn't cost more than an hours labour

[Torque]

Yes and no. 1 hour of labour gives about 60 quids. This is the start price for Ultrasonic Cleaner right?

I know, but intstead of spending lots of money on paying for services I prefer to get more more workshop stuff.
That's possibly not my last bike, also I've got 2 cars... there is always anything to do with that.


... also I am not sure how long I will ride a bike during a winter... so I assume when there will be summer I will have to clean carbs again... so it means paying again for service.

[midden]

It so screams ignition breakdown. 

[Torque]

Yesterday all the evening I've disassembled carbs, splitted, boiled, joined together and soaked with spray carb cleaner.
Today I've spent morning assembling carbs back and afternoon fitting them back.

Bike started, however 3,4 cylinders are not firing. It seems to be fuel problem.
The good point is that even having 2 cylinders engine don't get choked and throttle is responsive.

I've drained 3,4 carbs and tried to apply some Wynns carb through the drain valve, however it did not help.

I've checked spark plugs and were dry, seems to be fuel problem.

Crap crap crap... I am pretty sure that's the problem when you don't have the compressor.

I am angry on myself, because maybe I should from very very start buying compressor + ultrasonic cleaner or just pay someone to do it.

[Torque]

I've got a compressor and few litres of vinegar. Update soon, fingers crossed it must work !

[Torque]

Right. Carbs cleaned very carefully. Dried with compressed air.
After carb sync, bike started run on all 4 gears. Idle is still rough as it was, but it's not worse.

You won't believe there is still the same issue, but now it looks different.
It stutters mostly on revs lower than 6k, but this is no clue it can stutters than runs fine, after few yards it can stutter again.

If you have high rev and add lots of gas it will stutter for few sec than go like rocket.
If you have medium&low rev it can stutter for few sec and start to accelerate normally but can die as well.

Basically now I don't think is the carbs issue. I am going to check ignition coils and ECU again (I've got replacement). If not then I will buy ignition coils. If it don't work then all I can do it's sell my bike ... but already invested too much effort. I want to really fix it.

[humbucker88]

Check your carb to head rubbers for a vacuum leak, easy to check, not so cheap to fix though.