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89 cbr 600 bike will run. Fuel started pouring from carb overflow only while running. Just started today and has not had any recent carb work.. what could be causing this

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  • Motorcycles Master
  • 991 Answers

The spring loaded pin on the end of your needle and seat valve is not working. They jam up and then with vibration let extra fuel into the bowl and cause flooding.

Posted on May 02, 2015

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Posted on Jan 02, 2017

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SOURCE: 2003 WR250 F - eng. won't idle down and carb starts to overflow

Hi Jwelden,
Have you checked the float level in the float chamber?
I guess you may have to reset the float pin adjustment, its allowing more gas to pass through thn required and thus the overflow!
Not bad too, when you are working on the float assembly take the opportunity to blow out the fuel line from petcock to the carburator via the seat for the float pin,any foreign particals there would stop the float pin to seal up and thus overflow.
Fit in an inline fuel filter , this will help keep out the dirt or whatever.
Hope this helps.

Knight (Yamaha Seca XJ750A 1981)


Posted on Feb 13, 2009

  • 3567 Answers

SOURCE: Fuel pouring out of overflow tube

Yes, it sounds EXACTLY like a stuck float. You may be able to fix it yourself depending on how accessable the offending carburetor is. Quite often you can free up a stuck float by setting up a bit of vibration. Give this a try > tap the side of the carb repeatedly using the plasitc end of a screwdriver. You are not looking to hammer the thing to death, just create minor shocks. The shocks / vibration will often free up a stuck float. Please rate this solution and let me know if all went well.

Posted on Mar 16, 2009

  • 1 Answer

SOURCE: 89 fzr 1000 fuel pump problem

It seems likely that your fuel pump is not operating, you should hear the fuel pump priming when you turn on the ignition, if not the fuel pump is at fault, this is not uncommon and a replacement is the answer.

Posted on Mar 30, 2009

  • 1 Answer

SOURCE: Fuel System in Ducati DARK 600 Monster,

Strip and clean carbs, I had the same problem and that's how I fixed it. Take the carb to bits then soak all the bits in clean petrol (or prpsi believe it or not) for 1/2 an hour.

Posted on Jun 18, 2009

  • 202 Answers

SOURCE: Bike is backfiring through carb.

do u have the correct spark plug the one recommended by the manufacturer

Posted on Aug 02, 2009

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My 1993 cbr 600 is leaking gas in the muffler


Hi, Douglas "DO NOT!!!!!"start-run-drive your bike for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. If necessary, transport your bike to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your problem. 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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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.
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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.
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1 Answer

I have a 1995 cbr 600 f3. I stored it last fall and shut the gas off. Now when I start it and turn the gas on, gas pours out of a over flow line and doesn t quit unless I turn off the gas and bike the...


Floats are sticking in carbs and staying open which causes fuel to overflow.you can try tapping float bowls with screwdriver handle sometimes this will free up floats .If this dosen't work you have to remove and clean carbs.Good Luck

Apr 12, 2011 | 1996 Honda CBR 600 F(3)T

1 Answer

Hi my honda cbr 600 fl 1991 the bike pulls great


im not sure if this model has a fuel pump but follow your fuel line and see if it does wen u find it remove black plastic cap and check the points contact breakers are in good conditon ie not worn uneven or worn out and that they open and close.check your air filter spark plugs and your carbs could have a blocked jet so get them cleaned and balanced.

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2 Answers

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Check the vacuum pipe from the carbs to the fuel tap, if its gat a pin hole in as you demand more fuel the vacuum loss cuts downthe fuel flow and the bike will stop!

Jul 28, 2009 | 1997 Honda CBR 600 F(3)V

1 Answer

Fuel leaking out of the crankcase


Sounds like the float is stuck in the carb.. its not really pouring out of the bottom of the cranks case.. its an overflow hose that is routed down through the motor so it will drain out under the bike.

You probably need to pull the carb and clean it, and check the float.

Jul 18, 2009 | 2005 Honda CBR 600 RR

1 Answer

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Check compression ratio and valves clearance.The carbs leak any fuel from their o-rings.Spray through the air box with a carb cleaner spray while pressing start button but little bit at a time.Don't twist the throttle too much and always use choke until she fires up for good.

Jun 03, 2009 | 1996 Honda CBR 600 F(3)T

1 Answer

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wow, 7 years without use! try to check if the fuel pump motor is still working... also check the fuel lines if its clogged.. I hope you get your bike up and running again... feel that adrenaline rush when going 100+mph.. hehehe.. have a good one bro...

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1 Answer

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Check the compression. If it has low compression it will always be difficult to start. I have the same bike. It is a really good starter, comparatively to other older 'cycles I own. 1) Check the fuel level in the tank, and be sure to turn the fuel switch (left side of bike below tank and seat) to On, or even Reserve 2) In stock tuning, my bike likes full choke for cold start, in any ambient temperature, it likes to warm up with the choke on, until it starts to sputter from the rich mixture. 3) I believe this bike has vacuume tube that goes to the fuel petcock, this shuts off fuel to carbs when bike is not running. Thus if the bike has not run in a while, or the carbs drained, it will take several start attempts to get the carb float bowls filled. 4) This bike is hard to start if the battery is old or marginally charged. 5) Also pull the spark plugs, if they are brown, or black, change them. 6) check the air cleaner, if it is too dirty it will essentially act like a choke

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