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Re: needle and seat are stuck closed
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,,,
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Hi Kelly, Seems like the problem is needle stuck in seat, The needle and seat let the gas into the bottom of the carby and as the gas rises in the bottom of the carby the float rises as well pushing the needle up into the seat slowing the gas flow into the bottom of the carby.... As the motor's using the gas in the bottom of the carby the float's lowering and the needle lowers as well allowing more gas into the bottom of the carby, If a needle's stuck inside the seat NO gas(petrol)will be let into the bottom of the carby. Sign of a needle stuck inside the seat is unscrew the bottom of the carby from the top and if NO gas(petrol) in bottom then it's stuck, Pull needle out from seat with fingers and spray up seat with a carby cleaner and wipe needle as well, Replace needle and push needle up and down with float to check it freely slides again.... I hope you know what I mean... CHEERS..
fuel leaks from a carby when the fuel pump is working indicates a stuck or faulty needle and seat assembly in the carby allowing the bowl to over flow . check the fuel pump pressure is not excessive and remove the needle and seat assy and check needle for cracked rubber around needle or something as simple as a hair stopping the needle from seating properly
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.
The float and needle are stuck. Check that the float has no fuel in it by removing and shaking the float. If anything in it, replace it. If float is good, then ensure that there is freedom of movement. If that is good, check the needle and seat. If do not find the problem, replace needle and seat. The seat can be removed with a wood screw, carefully, and the new seat can be installed with the flat end of a drill bit that closely approximates the size of the hole.
Sounds like the needle is not closing in the seat. Open it up and check to see that the needle is still attached to the float with the small spring. Or possibly a small piece of dirt got stuck on the needle and wont allow it to close. Clean it off and retry.
This is caused by a problem in the carburator, usually the needle valve is stuck open letting gas continue to flow into the motor even when the float bowl is full. Things to check for are that the float is still in tack and floats on the gas so it can close the valve. More likely there is something stuck in the needle valve holding it open. If the needle valve tip or seat is damaged it can also cause this problem.
If you have gas coming out of the top of the carburetor then you could have either a bad float, a stuck float or a bad needle and seat, all of which are inside the carburetor. The float rises with the level of fuel and shuts off the incoming fuel by pushing the needle valve against the seat thus stopping any more fuel from entering the carburetor until the fuel level drops slightly at which time the needle moves slightly away from the seat and allows more fuel to enter again. You could also have a piece of crud that has gotten between the needle and seat which will prevent the valve from fully closing but that's pretty rare. You will probably need to have the carburetor cleaned, inspected, and have a repair kit installed to fix the problem.