Hi,

I really need advice to start my fireblade.
My engine is running on 2 cilinders (nr.3 and 4)
When i start my blade model 99 with carbs she runs for about 5 seconds on 4 cilinders but then cilinder 1 and 2 are flooding and there is coming fuel out of the carb breather pipe and through the small tube on the downside of the carb of cilinder 2. When i clean sparkplug 1 and 2 and let the fuel leak out of the cilinders it starts very easy but then again after 5 seconds she only runs on cilinder 3 and 4.
And when i feel the exhaust pipes only the one for cilinder 3 is getting really hot and 4 a bit less hot.
Does someone know what the problem could be ?
At this moment i really don't know what's wrong.

Thanks, Marco

Sounds like the carbs could do with a good clean. No 4 seems to be running about right, No 3 lean and 1 & 2 flooding, perhaps due to the floats not shutting off.

1) What fuel pump are you using
1b) Are you running a FPR, if so, what pressure
2) Have you blocked off the little pipe which comes out under cylinder 2? (sounds like no)

Hi,

1) fuelpump from a CBR 600 bike engine
2) not running a FPR, where is it for ???
3) have not blocked the pipe

Marco

You'll need new plugs for certainnow as well unfortunately!

quote:

---

Originally posted by marcotuinenburg
1) fuelpump from a CBR 600 bike engine
2) not running a FPR, where is it for ???
3) have not blocked the pipe

---

Oké, I need new sparkplugs and i think my fuel pump is from a carb'd engine.
But i don't understand why to block the pipe because that cilinder is flooding ?

Thanks, Marco

sounds like the carbs could do with cleaning also have you checked the fuel pump is pumping the correct amount? Instructions here

1. Get a suitable measuring jug, normal small kitchen jug will do.
2. Disconnect the fuel pipe by the carbs (make sure you have some ragkitchen roll under the pipe to catch any fuel that leaks out.
3. Put the end of the fuel pipe into the measuring jug and turn the ignition on so that the fuel pumps for 15 seconds.
4. Turn the ignition off and measure how much fuel was pumped through.
5. The pump needs to pump at least 900cc per minute so in 15 seconds you should have at least 225cc in the measuring jug.

Also check the fuel filter and confirm your pump is off a carbed bike and not injected as the pressure is far too high.

Rich.

sounds like the carbs could do with cleaning also have you checked the fuel pump is pumping the correct amount? Instructions here

1. Get a suitable measuring jug, normal small kitchen jug will do.
2. Disconnect the fuel pipe by the carbs (make sure you have some ragkitchen roll under the pipe to catch any fuel that leaks out.
3. Put the end of the fuel pipe into the measuring jug and turn the ignition on so that the fuel pumps for 15 seconds.
4. Turn the ignition off and measure how much fuel was pumped through.
5. The pump needs to pump at least 900cc per minute so in 15 seconds you should have at least 225cc in the measuring jug.

Also check the fuel filter and confirm your pump is off a carbed bike and not injected as the pressure is far too high.

Rich.

Before you buy new plugs try cleaning them by heating the end with a blow torch, worked fine for me.

Check your float heights, and fill your float bowls with fuel before refitting them and don't turn your carbs upside down. Floats can very easily stick open.

quote:

---

Originally posted by marcotuinenburg
Oké, I need new sparkplugs and i think my fuel pump is from a carb'd engine.
But i don't understand why to block the pipe because that cilinder is flooding ?

---

Oké,

Thanks for the help for now from all you guys, it's just great.
I'm going to check all those things.
The fuelpump does make a strange sound when he is on pressure.
It sound's like he is going on and off constantly, don't know if that is normal.

Thanks, Marco

[Edited on 11/9/06 by marcotuinenburg]

If the floats are stuck open the pump will alway be on, as it won't ever see the back pressure needed to switch it off.

Today i bought 4 new sparkplugs and some carbcleaner.
I measured the amount of fuel in 20 seconds.
It was 450 gram or 1 Lb of fuel in 20 seconds and that was at the side of the engine just after the filter.
Is that to much fuel for a carb engine ?

Marco

It's not the amount of fuel, it's the pressure at which it's delivered. The pump is pushing against the float valves and the only things stopping the carbs from flooding is the condition of the seal of the float valve and the bouyancy of the floats themselves.

The pump should only be delivering a few psi (5 or so), but if your pump is off any carb'd bike it should be fine as jap bikes use either Mikuni or Keihin carbs and the fuel control process is identical.

Check your float heights as shown in the manual, check to make sure that your floats float, check the condition of the float valve and if all is ok, reassemble with fuel in the float bowls.

[Edited on 12/9/06 by Coose]

Does the pump look like

No, this is the fuelpump.
Rescued attachment DSC00448.JPG

and from another angle

[Edited on 12/9/06 by marcotuinenburg]
Rescued attachment DSC00446.JPG

As far as I can see that is the correct pump, usually made by mitsubishi.

The amount that flows does matter as not enough will mean the carbs are not getting enough and I know this from personal experience as I had exactly this problem! changed the pump and it pumped the correct amount and the engine fired and ran fine.

The pump will make a noise while it gets to pressure and then shut off although mine is quite noisy alot of the time. It's not actually the CDI that shuts the pump down but it does shut itself down at about 2psi.

The pump should pump at least 900cc per minute so if you run it for 15 seconds and multiply it by 4 to see how much it would have flowed in a minute then you can see if it is flowing the correct amount

HTH,
Rich.

Oké,

Did a lot of work tonight.
The pump is pumping the correct amount of fuel.
I cleaned the carbs, there was sand inside the floating chambers
I cleaned them and after refitting the engine did run for a very short period on 4 cilinders and finally was running on 3, only number 1 is the lazy one.
Tomorrow i'm going to clean the floating chamber and needle of cilinder 1 again and hopefully that will work.

Thanks for all your advice everybody.
Marco

[Edited on 12/9/06 by marcotuinenburg]

Sand doesn't sound good, but at least you are getting somewhere.

Perhaps the bike the engine is off went into a gravel trap at some point

Glad you managed to get it mostly sorted. If you can't get the float right, try a very light sand papering/wet and drying of the float needle to aid in easy movement. Also check the valve seats fully.

if your sure the pump is ok u could try a fuel pressure regulator.

failing that take all the covers off the bottom of carbs float bowls you will then see the floats take out each little roll pin that holds in the float you can then pull out the needle valve need to soak them in carb cleaner and spray everything eles to get the inside of the carbs clean.
that should work.
also check the mixture screws that sit next to the float bowls count the turns as you screw one all the way in c if the rest are the same amount of turns ,i think i have mine set to 2 and a quarter turns out.
cheers
si