Question about 2000 Honda NSR 125

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Nsr 125 2000 problem with petrol

When ive rode the bike and stop petrol comes out of the over flow not sure if its from carb or the tank

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  • Anonymous Apr 01, 2014

    Hey, my nsr has just started ******* oil out the overflow on the main oil tank, even when the bike is off after a ride it continues to pour on the ground, what could this be?



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Your description although very brief appears to relate to carburretor as overflow will only occur due to sticking float valve.
A clean up of internals required, attention carefully to float valve.
Good luck!
Oh if you respond positively with Fixya button it will be a great help?
Paul 'W'
Onyer~Edson(:0) {#><U.K.

Posted on Jan 18, 2009


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I have petrol leaking out of the bottom of my bike but the bike hasn't cut out ??

Let me get ths straight, there is petrol leaking out of your bike, more or less between your legs and you are still riding it??? STOP, if you have no concern for yourself, consider othrs around you. Dont ride this motorcycle until you find and repair the problem. I would suspect a vent or fuel line but it could be the carb over flow or a hole in the tank. Please get it fixed before you ride again.

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I have 97 marauder vz 800, the bike was in for a carb clean out a month ago rode it once and then put it in storage i tried to start it today and noticed a fuel leak, i took the tank off and checked the...

Hello Colin, the fuel leak from the upper hose would indicate excessive gas due to flooding, as you stated. It could be the float has stuck and not letting the float valve close to stop the fuel flow. This happens a lot when a bike is stored... Other possibilities - The float could have a pinhole in it causing a high fuel level, or not adjusted properly. Also, make sure the choke is not stuck partially closed. Remember, a "wet" gas soaked spark plug will not fire, so it's best to replace the plugs after they have been flooded or fouled. I hope this information is helpful.

Nov 07, 2011 | 2000 Suzuki VZ 800 Marauder

1 Answer

No fuel coming from tank into carb

1) This might sound daft but check if there is actually fuel in the tank. Many bikes have been stripped down by the hard of thinking only to find the tank was empty...or the tap was off... or should be on reserve... 2) Assuming this is a gravity tap (one main pipe) and not a vacuum tap (one main pipe and one smaller pipe at the side) Turn tap to off and remove pipe from tap. Turn tap on and see if fuel flows. If yes, then replace fuel pipe (this should sort it, try again with the pipe off at the carb end and see if fuel comes out. If it does but the bike still won't start then the carb jets are blocked.), if it still doesn't flow then go to3)
3) If there is fuel in the tank then remove tank and pour it out into a can. Remove tap from tank by unscrewing with the correct spanner. 4) Examine the guaze filter, it is probably full of crud and muck. Clean with fresh petrol and replace.
Hopefully that should sort it.

Mar 04, 2011 | 2001 Sym Husky 125

1 Answer


the only thing i can suggest, is a sticky needle and seat, if fuel is coming out the over flow, then the float is not shutting off the fuel running into the carb, it has to go some where, so it comes out the overflow. Pressure in the tank wont have any affect at all with your problem. I would take apart the carby again, and check and clean the needle and seat.
Hope this helps

Jun 13, 2010 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

Starting trouble

If the odd substance was at the bottom of the float bowl it was water. If it were oil it would have mixed with the gas and you would not have seen it. Drain the carb into a cup to remove any additional water from the carb and petrol tank. When no more water comes from the tank you should be okay to start the bike. Clean air filter? Water gets into the tank via condensation in the tank.

Dec 31, 2009 | 2001 Honda NSR 125 R

1 Answer

Fuel leak underneath bike

Most likely comes from the carburetor's overflow tube.Start looking in there to rule out the possibility of overflowing.If it is so you need carbs cleaning and adjusting.

Jun 06, 2009 | 2000 Honda NSR 125

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it sounds to me like the carb float levels are out of adjustment and it is overfilling the bowls,or,the needle valve seats are worn and leaking,which will allow fuel to continue filling the bowls even though it looks like they are closed,remove the carbs from the bike,remove the bowls,turn the cabs upside down close the floats(push them right to the top,this simulates full bowls)then blow throgh the fuel inlet pipe,if you can hear air escaping from around the seats they are faulty,also check that the seats themselves are tight in the carb body,i dont know why but gsxr carbs seem to shake the valve seats loose..hope this helps

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Check the carb diaphrams for any tears/pinholes? (They are on the top of the carbs) Have you reconnected the breather from the tank? Is fuel getting past fuel tap? Sometimes the vent in the fuel cap can get blocked with crud and create a vacuum which stops fuel flowing.

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Hi ..... Lots of variables on this one. Pull the petrol pipe from the carb(s) and ensure you have a stong/steady stream of petrol. Remove the spark plugs and have a look at their colour, should be a light tan. The petrol tank has a breather hole near the petrol filler OR through the filler itself make sure this is clear and unabstructed.
Let me know how you get on.

Jan 02, 2009 | 2005 Hyosung GT 250

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