Question about kawasaki EL 250 Eliminator Motorcycles

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I have a problem with the carburetor, overflowing because I let the pressure of air from the compressor in the fuel supply hose to the carburetor, since then we overflowing, what do I do? that part could fail?

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  • dr_parrazit Apr 03, 2011

    thank you very much for this solution it was helpful,i'v take down the carburateur and clean up and this is it,petrol was very bad in tank and this is was the problem when i applied the pressure into carburateur and damaged the filter and and therefore the pressure I crammed the dirt inside the carburetor

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You have probably damaged the float valve, it is very delicate, depending on how much pressure you applied, depends on how much damage, the float valve is a small pin with a point at one end, when the carb fills, a float pushes up on this pin, and the point of this pin blocks the flow of incoming petrol.
Remove the carb, remove the the screws holding the bottom of the carb and remove it
Inside the bottom of the carb is the float, it will be made of brass or plastic, it is delicate and very easy to bend, be careful, the float hinges on a pin that can be slid sideways to remove it, look at this closely, near the centre of this pin there should be a metal tab that pushes onto the float valve pin, sometimes the valve pin is held in a slot in the tab.
Slide out the float hinge pin, and gently lift the float upwards, check that the float is not punctured by shaking it gently by your ear to make sure there is no fuel inside.
Now you should be able to see the valve pin sitting in its hole, lift out the pin and examine closely at the sides of the point, any wear, and it will not be able to stop petrol and will overflow, also, even the smallest speck of dirt will cause this valve to fail, and the carb to overflow, all must be spotless.
the valve pin is not repairable, if it is worn or scratched, it must be replaced, on old bikes the pin point was made of metat, on newer bikes the point is made of a black rubber to give a better seal, both are very easy to damage, good luck, H

Posted on Mar 25, 2011

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Posted on Jan 02, 2017

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Carburetor leaks fuel in the combustion chamber and out through the area of the throttle plate into the air filter.This happened after I had to replace the fuel lines .


This is not as easy as it appears!
The image below is the proper routing for the fuel lines from the tank through the primer and carburetor.

It is so easy to assemble this backwards and pump unfiltered fuel through the carburetor. Or Assemble it so that the primer pushes fuel into the carburetor.

The primer pulls the fuel through the filter located in the tank up the inlet hose into the carburetor internal fuel pump filling up the carburetor and purging out any air. The output of the primer returns any excess fuel back into the tank via the return hose.

26117870-p2kvwqjbo3oi50ps2xua1eg1-2-0.gif The center connection at the primer bulb is the output return to the tank and the off center connection at the primer bulb is the inlet from the carburetor.

26117870-p2kvwqjbo3oi50ps2xua1eg1-2-2.png If it is correct you need to perform a leak check on the fuel system. Reach into the tank and retrieve the fuel filter attached to the hose. Carefully remove the filter from the hose and with your finger over the end of the hose pump the primer. You should hold a vacuum. If the primer will not stay down air is leaking into the fuel system. Any air will disable the engine from running. The carburetor needs to be air free to function.

If air is not leaking from a hose connection and is internal to the carburetor it is likely that contamination has logged either in the needle valve or check valve.
Below is the check valve that prevents air from entering the fuel passages from the fuel jets when you prime/purge the carburetor with the primer bulb.
26117870-p2kvwqjbo3oi50ps2xua1eg1-2-5.jpg

If the carburetor is filling with fuel when you prime it is likely that the the primer is pushing (incorrect hose routing) the fuel into the carburetor through the impulse pump and through this check valve. Correct pluming and try again.

The needle valve is located under the four screws under the diaphragm and is actuated by the diaphragm.

Cleaning the check valve is almost impossible. Most have a rubber washer that can easily be moved out of place from the use of excessive air pressure. The claim is that the check valve can be replaced. I've never been successful and ended up replacing the carburetor. Messing with the needle and diaphragm has not always resulted Joy either. You can leak check the needle valve by plugging the inlet hose and pull the fuel out the primer bulb connection using the primer bulb. Cleaning the carburetor with the small holes and blind fuel passages can create a problem by plugging the tiny fuel feed holes you are trying to clean.. In the newer machine the adjustment screws are not removable preventing the cleaning of the needle clearances. This is a bumpy road well traveled by many!!
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1 Answer

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Do not mix them up!! Doing so will bring debris into carburetor. Assuming the line from back of tank to carburetor is the fuel feed line then you should also plan to replace it if the other lines have failed..

The primer bulb sucks (pulls) the air fuel through the carburetor thus venting out any air. The process draws the fuel through the in tank filter through the impulse fuel pump. The fuel connects via an internal carburetor passage from the pump to the needle valve and during the prime passes the needle valve into the pressure diaphragm chamber. From there the fuel is drawn(sucked) into the inlet side of the purge/prime valve and returns the air fuel into the tank.

The center hose on the primer is the return into the fuel tank. The hose from the center of the primer bulb goes directly to the fuel tank and is the return. The outer diameter hose connection to the primer is the connection made to the carburetor. By closing off the end of the hose you can test with your finger the function of each hose. You do not want to pass fuel into the carburetor by reversing the primer hoses.




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