Question about 2007 CCM 404 Enduro

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Float needle valve and seat are not sealing very wel

When i make the tank full my carburator run over throught the overflowtube. Can somebody tell me why? I have to make the fuel tap OFF when i stoppage and take off the motor.

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If it only does it when the tank is full I think it will be that the float needle valve and seat are not sealing very well and will need to be cleaned or replaced. If it does it all the time then I would say its down to the float height being incorrect.,

Posted on Nov 10, 2008

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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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Hi Anonymous, and the usual suspects are:
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You need to remove and clean the carbureator, the needle and seat are dirty and allowing the fuel to leak by and out the overflow. A good cleaning should fix the trouble.

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# carb not getting fuel

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Theres a problem to the front carburator thus the flooding, the float pin is not sealing of the fuel supply once the bowl is full.You will have to reset the float, remove the bowl and operate the float manually( by your fingers lifting it to seal) letting the fuel to flow, if it stops thn for sure the float needs adjusting, if it doesnt stop the flow thn the pin is not sealing,you may have to replace the float pin.
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Knight (Yamaha seca XJ750R 1981)

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1 Answer

Fuel pump and overflow

The problem is not so major. There are a couple of things you need to check.
  1. Make sure you are not getting dirt in the system because it will cause the "needle and seat" to not seal properly when the float chambers are full.
  2. Reset the float level. In time the "needle and seat" in the carbs wears and consequently you will need to reset the float level. You can contact me if you cannot find the float specs and I'll tell you how to do it without elaborate measuring equipment. It's sort of complicated to explain but easy to do.
  3. Worse case scenario you will need to replace the "needle and seats" in the carbs. They come as a unit sold separately so you will need one for each carb.
  4. You do NOT need to replace the carbs. DO NOT go buy a new set, you're wasting money. The fix is really quite simple and at a fraction of the cost if any.
My experience tells me that you should almost be able to simply readjust the float level to cure the problem. The needle and seat will endure up to 12.5 lbs of fuel pressure minimum so not to worry.
Best of luck and let me know if you need further assistance.

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