1993 FZR1000 leaks fuel from overflows

[ironmanbrando]

I'm hoping someone can help me with a issue. I purchased a 1993 FZR1000 with 17,000 miles on it. I completely tore it down for rebuild as it was once a salvage bike.

I dis-assembled the carbs as the bike hadn't ran in quite sometime. I replaced almost every gasket I could find in the 4 carbs. When I re-assembled the carbs and bike, upon startup, fuel poured out the overflows. I figured the fuel pump regulator was bad as most older fuel pump regulators crap out after time, so I placed an inline pressure regulator in the system....to no avail.

Next I figured there was a stuck float, so I removed the bowls and manually closed each float with the pump on, and each shut off the fuel flow, but fuel still came out the overflows between the carbs. I am tempted to remove the fuel pump for a standard electric version, but was hoping to keep the Yamaha one there if possible.

Any suggestions as to how I fix the fuel coming from the overflows?

Thanks,
Lingle

[yamaha_george]

did you manually close ALL the floats down ? if not one of the others was letting it past.
Did you set the float heights correctly check the WIKI for the how to

[haro504]

did you try to blow into the fuel inlet of the carbs and see it there actually shutting off

[thatkid]

I have no knowledge of the 1k carbs.

I do know the 600 carbs have a rubber o-ring seal 13mm diameter (approx) that seals the float holder to the carb body. If the 1k has a similar o-ring, it's possible that is the cause of the leak.

My 600 was leaking fuel out of one of the overflows, the culprit was the mentioned o-ring.

[trifgeorge]

As yamaha_george said, there are pretty big chances to have the wrong float heights set. it happened to me when i tried to start a '92 1000. I set the floats to 14 mm (i hope i remember correctly) then it was running like a champ.

[fire-medic]

And if setting the float height doesn't do it, your float needles are in-need of replacement most-likely. You should be able to see which carb(s) is/are leaking by the overflow tube puking gas.

[tz250racer]

As yamaha_george said, there are pretty big chances to have the wrong float heights set. it happened to me when i tried to start a '92 1000. I set the floats to 14 mm (i hope i remember correctly) then it was running like a champ.

How you do that?.Yamaha service manual does not say how to set the floats level at 14mm but only how to check the fuel level.

[watto1]

Have you try`d tapping the carbs worked on a few occasions for me