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
  • 45,445 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

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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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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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1 Answer

1989 Honda CBR 600 F Hurricane gas leaking from the vent tube


Hi, Anonymous 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.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
http://www.fireblades.org/forums/honda-cbr-600/97399-gas-leaking-vent-tubes-going-air-box-help.html
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1 Answer

1993 Honda CBR 600 F(2)P carburetors leaking fuel


Hi, Anonymous if your bike has been sitting idle for months or years and you did not do any pre-storage maintenance I feel your pain it will probably have a dead battery and not want to start or if it starts it will not idle unless the choke is full on and run poorly then stall, here are the following steps necessary to complete in order to get your bike back to an acceptable running condition and in the future pour in a bottle of fuel stabilizer and injector cleaner for you FI folks at least 2 times a year and before storage.
1. If your battery was 2-3 years old when you last had the bike running you should replace it.
2. If you believe your battery might still be serviceable remove it from the bike and put it on a 1 or 2 amp trickle charger for 24 hours. If it is the old lead acid type with visible cells and acid levels fill each cell to the top line with distilled water and replace the caps, run the vent tube into a plastic or styrofoam cup, any cells that are cloudy/milky replace the battery.
3. After charging the battery remove the leads and let it sit for a couple of hours then check the battery voltage with a voltmeter, you should have 12.5 volts or more, any readings in the 11 volt range you need to do a proper "LOAD" test on the battery and replace as necessary, you may have 12.5 volts or better but little or zero amps, any readings in the 10 volt range you have a dead cell and the battery needs to be replaced.
4. Drain and flush fuel tank if it rusty there is a cheap and easy fix. https://www.youtube.com/watch?v=fUYr_7SwGms
5. Remove and inspect your air cleaner paper elements that are not oil soaked can be cleaned with a soft brush and low pressure compressed air, oil-soaked elements must be replaced. Gause mesh and foam elements can be cleaned by soaking them in a container big enough to completely cover them with a solution of 1 gallon of water and 1 oz. of Dawn dishwashing liquid for small and medium size elements, for monster size double the formula and let soak for at least one hour then rinse with warm water shake off excess and let air dry, "WARNING" do not use compressed air as this will embed micro-sized dirt and road grime and destroy the mesh pattern and stretch foam elements out of shape just squeeze it like a sponge and let air dry, use a fan if you're in a hurry. When completely dry spray a very fine mist of air filter oil evenly around the whole element.
6. Remove the carburetors, disassemble and decontaminate with a "CARB DIP" or if you have EFI remove injectors and clean with carb spray and compressed air
7. Check intake manifold and seals for leaks and craks.
8. Remove fuel valve and filter disassemble and clean as necessary, remove, clean, and inspect fuel and vacuum lines and replace as necessary.
9. Replace spark plugs with new ones and check for spark.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Fuel leaking from carb overflow CBR Forum Enthusiast forums for Honda CBR...
CBR 600 F2 1994 Fuel overflow Honda Motorcycles FireBlades org
1991 1994 CBR600F2 Service Repair Manual Download Manuals Technical $15
https://www.partsfish.com/page/oem-parts-for-honda
http://www.hondampe.com.au/docs/owning_a_honda/owners_manuals/motorcycles/CBR600F-1994.pdf

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1 Answer

1993 Honda CBR 900 RR will not idle


Hi, Nicky and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
13. Multi carburetors not in sync.
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.
http://www.fireblades.org/forums/honda-fireblade/65790-1995-cbr900rr-sputters-dies.html
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Aug 26, 2011 | 1993 Honda CBR 900 RR Fireblade

1 Answer

Would the carbs from a 93 honda cbr 900rr fit on my 92 cbr 600 f2


Hi, Briault16 the answer to this question is way above my pay grade for this situation, I would call or visit my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
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.
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Honda CBR600F4I 2001 Service Manual
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1 Answer

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.

Nov 20, 2009 | 1998 Honda CBR 900 RR Fireblade

1 Answer

Fuel leaking into crankcase on 2001 Honda CBR 600 F4i, Bike sat for 3 years tank had rusted religned inside of tank and changed fuel pump however when religning tank i filled vent tube so the tank didn't...


it's probably leaking from the carb and down the cylinder into the crankcase.
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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1 Answer

Gas Leak via Overflow


The usual culprit is a blocked vent tube. Verify it's open. The usual indicator is either a pressure release when you open the gas cap, or a vacuum "sucking" noise when opening it first thing in the morning. On a carb equipped bike, the carb overflow lines will leak, but in a fuel injected bike like yours, it'll be out the overflow vent. The next time it begins leaking, open the gas cap. It should stop immediately as pressure inside is released. Good luck.

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