Generally a flickering neutral light indicates that the switch is worn, particularly its internal spring which keeps the contacts closed/open. The flickering will only get worse as time goes by. It's a fairly common problem on bikes as they age - just think how many times that switch has been open and closed during its life!

Removing the switch from casing (LHS) and giving it a clean helps. It is also worth tracing the wiring back to the connector block and making sure all is good, clean and there are no areas where the insulation has worn through.

If the neutral switch is temperamental (or stops working) the biggest problem you will have is the bike won't start on the sidestand as the start inhibit system will think it is in gear.

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