Honda CB400 Super Four (NC31) 1999 Model What is the Exact Needle Value for carburetors?

I recently bought a used reconditioned, Honda CB400 Super Four (NC31) Year 1999 Motorcycle and now it has a fuel overflow problem. Carburetor needles that have are shorter than it should be(the black head thing on the needle value won't fit compltetly).

Can anyone tell me what is the exact type of needle to use on the carburetors to fix this issue, i tried cb250f ones, and didn't work.

Please help me to overcome this problem.

Thanks a lot…

Added (1). Correction on the topic, it should be Needle Valve*****

Added (2). fual off low problem, fuel comes through the exhaust pipes in the morning… Honda CB400 Super Four NC31 1999 Model What is the Exact Needle Value for carburetors - 1

Is this the correct needle type? Honda CB400 Super Four NC31 1999 Model What is the Exact Needle Value for carburetors - 1

Sounds like the carbs were not rebuilt. Get a rebuild kit from Honda and a Haynes / Clymer manual with the carb setup / balancing procedure. Gasoline flowing into the cylinders, diluting the engine oil, is a serious problem. Rebuilding carbs is easy if you take your time.

Purchase 4 sets of needle & seats.
They are not interchangeable.
Another repair procedure you may have overlooked - one of the floats might be leaking, preventing the float from rising with the fuel level.

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