Over time, needles can wear out, deform, or accumulate fuel residues, compromising their functionality. A common problem is sticking, which occurs when the needle gets stuck in the open or closed position. This can lead to an incorrect air-fuel mixture, causing issues like irregular ignition, increased fuel consumption, or, in more severe cases, engine damage.
Sometimes it may also be necessary to replace the housing where the conical needle operates, check it during maintenance.