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?


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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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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.

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1 Answer

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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.

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WHEN I FORGOT TO CLOSE THE FUEL **** THEN IT BEGUN TO OVERFLOW AFTER A FEW SECONDS, THEN IT'S NEVER START UNTIL YOU OPEN & CLEAN THE SPARKS PLUG, IS THIS THE INHERENT PROPERTIES OF A KMX, MINE IS A...


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


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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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