Question about 1993 Honda CBR 900 RR Fireblade

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1993 CBR 900rr gas is leaking from vent tube

I have a 1993 CBR 900rr and gas is leaking from the carb air vent tube. Took the top cap off carbs and there appears to be gas and a muddy substance there. Diaphrams seem to be intact yet they definitely have had contact with the gas. Any Ideas?

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  • Honda Master
  • 39,929 Answers

Hi, Blackwidowbi and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
8. Damaged petcock diaphragm allowing fuel to flow through the vacuum line into the combustion chamber.
9. Contaminated fuel tank.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Leaky Carburetor CBR Forum Enthusiast forums for Honda CBR Owners
CBR 600 F2 1994 Fuel overflow Honda Motorcycles FireBlades org
Honda CBR900RR Service Manual
http://www.partsfish.com/page/oem-parts-for-honda
Honda CBR900RR Fire Blade Owner Manual

Posted on Jun 22, 2017

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Posted on Jan 02, 2017

  • 921 Answers

SOURCE: rebuild the carb on a 98 honda cbr 900rr. Where

Dont rebuild unless absolutetly necessary or need to rejet. Try some Seafoam first, it might save you hundreds of dollars and a lot of frustration.
read directions on can or just try pouring 1/3 can into two gallons gas and really get on it ...it might clear up any hesitation or stalling if thats whats happening. I got mine at Autozone for $10.( And it fixed the problem after riding for about 15 miles.)

Posted on Sep 15, 2009

mark24354
  • 776 Answers

SOURCE: i have a 93 honda cbr 900rr. the gas is mixing

Could be the carbs (difficult).
It could also be lack of spark (easy fix if you only have to replace spark plugs. Fix is more difficult if you have bad spark plug wires or a problem with the ignition system that makes the spark at the right time).


In any case, the unburned gas has to go somewhere so it runs down the cylinder wall and the piston rings will not seal well enough to keep it out.

Posted on Nov 20, 2009

  • 17 Answers

SOURCE: i have a 1999

definately need to purge your fuel system, fluch the tank real well and make sure there is no rust inside, and yes you will have to do a thorough carb clean, use parts cleaner and clean and **** every jet and port and make sure you clean them really well. only thing to be careful of is when you **** the jets and ports to not force and **** into the holes you dont want to accidently bore out your jets to a bigger size.

Posted on Jun 10, 2011

oorcru
  • 22 Answers

SOURCE: I bought a 96' cbr

disconnect the carb and do a flush threw

Posted on Sep 29, 2011

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1 Answer

Why is bike flooding and pushing gas out top over flow hose on carb after it runs for a min or two. Carb float been replaced still doing it.


Hi, Paige and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
For more information about your issue please visit the websites below. Good luck and have nice a day.
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Hi, Rick and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have nice a day.
http://www.thegsresources.com/_forum/showthread.php?94636-Leaking-Gas-from-Carb-Vent-Hose
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Vf750c


I to am having gas flowing from the Air Vent Tube "No. 6" The Air Vent Tube is connected to a "T" Connection, that branches into, the top of the Carbs. I refered to the Honda Service Manual. It stated to connect the Vent tube to the Carb. But which one and where? So I looked at the photos. no doubt. a puzzle to try to figure locations and angles.....but I cold find no cconnection for the No 6 Vent Tube?

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Hi Anonymous, if you have a carburator the usual suspects are:
1. Damaged or restricted fuel tank venting system (gas cap).
2. Inlet system air leak.
3. Vacuum piston malfunction.
4. Accelerator pump leaking or no output.
5. Plugged bowl vent.
6. Fuel level (float chamber) too low.
7. Restriccted fuel supply passages.
8. Plugged jets or passages.
9. Worn or damaged needle or needle jet.
10. Enrichner valve not seated or leaking.
Good luck

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Check for fuel supply problems (clogged cap vent, dirty tank fuel filter, clogged or faulty fuel intake lines, leaky or cracked primer bulb, air leak in rear crankcase cover...check 4 screws above gas tank, air leak in carb gasket...check carb nuts, trashed up carburetor...needs cleaning or rebuild, mixture screws need adjusting)....a myriad of possibilities here but I would guess it's a dirty carb....hope it helps

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I have a 93 honda cbr 900rr. the gas is mixing with the oil. can the problem be the carbs.


Could be the carbs (difficult).
It could also be lack of spark (easy fix if you only have to replace spark plugs. Fix is more difficult if you have bad spark plug wires or a problem with the ignition system that makes the spark at the right time).


In any case, the unburned gas has to go somewhere so it runs down the cylinder wall and the piston rings will not seal well enough to keep it out.

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it is probably due to a stuck float in the carb. take the float bowl off and make sure it is clean. the float can also be full of gas not letting it float up and stop the gas flow. the carb will fill up and leak wherever it can which is likely the case

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