Question about 2000 Alfer VR 2000 Supermoto

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Needle and seat are stuck closed

HOW TO CHECK IF MY needle and seat are stuck closed

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Drain the old gas out put some new gas in the tank and turn the fuel petcock to PRI or ON and check that there is a flow of clean gas to the carbs. Tanks that are badly rusted will require a filter in the gas line to the carbs. If not see the Gas Tank Page. If the gas starts to come out the carb over flow tube(s) tap the carbs gently but sharply with a plastic hammer or the plastic end of a screwdriver. Do this to each carb several times or until the gas over flow stops. If it does not stop you will have to take the carbs apart and find out why the fuel valve (needle and seat) is not working. See the Carb page. If it will not start, try to drain the fuel out of the carb with the float bowel drain screw. If nothing comes out, nothing is going in ! In other words the needle and seat are stuck closed. Again, if tapping the carb doesn't start the gas flow, take the carb apart to find out wh,,,

Posted on Nov 10, 2008

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Fuel going to carby but dos'nt seem to be going into carby. Will start for a moment as i pour fuel into chambers?

Hi Kristian, Seems like the needle could be stuck inside the seat.... You need to pull your carby off and unscrew the bottom half from the top, 1st sign of a needle stuck inside the seat is a dry carby There you'll find the float, push the float up and down and see if the needle above the float slides up and down from the seat, If the needle stays up then it's stuck and NOT letting the fuel into the carby, Just pull it down with your fingers to loosen it up. I hope this helps.... CHEERS..

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What would cause my 1997 Honda Foreman 400 gas line running from the carburetor down to the bottom of the frame to leak?

This is most likely due to the carburetor bowl being too full. The float can be stuck in a position allowing fuel to flow from the tank to the carb.(not seating closed when full, might just be dirt in bowl) Quick way to remove debris is to shut of the fuel from the tank. Open the bowl drain with a screwdriver, catching the fuel in a plastic cup to see if dirt is present. While draining the bowl, GENTLY tap the bottom of the carb with the plastic handle of the screwdriver. This should help get the dirt out of the needle and seat. Flush the bowl a couple of times by opening the tank valve to carb. Close drain and see if the float is working correctly. If it still leaks, you will have to remove the bowl and see what is preventing the needle (attached to float) from seating.

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1 Answer

Spitting petrol out side of carb

Your float is stuck or your float needle and seat are not seating well, allowing the fuel height to rise too high which then comes out the side. This is assuming that your float is adjusted properly in the first place. Pull the carb and pull the bowl and check for dirt in the bowel, check the needle and needle seat. check float height. You can also open the bowel drain, before you take anything apart, drain the carb. Turn the fuel on and see if you can flush it out after the bowel has emptied. You can also spray carb cleaner in the fuel inlet on the carb with the drain open and the carb empty. Not really a fix but might get you by for a while.

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1 Answer

I have a 95 rf 600 when I start it gas drips out of the carb just the left side but it runs fine and it is even drivable what is causing that

I suspect a loose fitting of gasket failure. Second is that the needle and seat may have something stuck under the needle and not closing off properly.

Apr 27, 2013 | Motorcycles

1 Answer

I stored my bike for a few months I ran all the gas out b4 I stored it now when i ride it gas pours out the over flow tubes the one on the bottom and the one on top on the pipe side of carb

It sounds like the needle & seat in the carb float chamber is stuck open. Take out the needle attached to the float and clean and blow the jet out. Replace needle and check when you lift the float if the needle closes. Before you reassemble, attache the fuel pipe and see if the fuel still runs out when you lift the float and the needle closes.

Jul 13, 2012 | 2006 kawasaki KX 250 F

1 Answer


Open the fuel tap and give the carby a hit with a piece of wood or something that wont damage the carby.The needle and seat inside the carby is stuck open and will let fuel drain straight through.The hit,sometimes frees this up.The needle and seat control the float in the carby and they sometimes stick.
Hope this helps

Feb 17, 2011 | 2002 kawasaki KMX 125

1 Answer

Fuel leaking out of overflow float is not stuck, no petrol is getting to the engine???

If the float is not stuck the needle and seat are not sealing, it could be a worn needle/seat or dirt jamming the needle. With fuel running out of the overflow, your engine should be flooding if anything (and this will also prevent it from starting) check to see if the spark plug is very wet after you have tried to start it several times.

Jan 26, 2011 | 2004 HM CRM 125

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Stuck Floates for a mccooney carburetor 1997

you need to remove carb., take off fuel bowl. float should be held in place with small pin, remove pin, float and needle valve. clean needle, needle bore with carb cleaner. inspect needle seat and tip for any dirt/debris. install needle float as assembly, then check float adjustment height

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1 Answer

Carb and valve adjustment

Dear Craig,
Presuming that the carb is clean !
It seems that you have either set the float level incorrectly, or allowed the needle to become jammed. The float bowl should a little less than 3/4 full of fuel when the fuel is shut off by the needle and seat.
Check that the needle and seat are working correctly by blowing in the fuel pipe, and then closing the needle by hand. Check that the flow is stopped when the needle is fully raised.
The needle and seat do need to replaced from time to time, but generally last well.
If the needle and seat work, then look at the float level.
Further check to see that the floats are not filling with fuel. If this is the case, then the floats will have to be replaced as most repairs are only temporary.
When the floats are fuel logged the needle will not be raised and fuel flow to the carb will be continuous.

Feb 14, 2009 | 1996 Honda XR 600 R

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