Main Motorcycle: 98 Thunderbird
Join Date: Jun 2002
Location: Surrey, UK
Other Motorcycle: Down to my last 1
You can remove the neutral switch without draining the oil, but the flakey neutral light syndrome normally only manifests itself when the engine is hot. You can use a Bonneville etc neutral switch which has a longer plunger and that will work more often than not.
When my clutch switch went bad, it worked in reverse- clutch in, no start- clutch out, start. A shot of WD40 would cure it for a time. Eventually I gave up and replaced the switch.