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Neutral indicator light

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Chris400F:
That was the query, the body of the switch is plastic. There is a metal cap at the 'plunger' end but I don't
think that is intended to contact with any part of the crankcase; electrically it is not connected to anywhere else.

I played around with the switches I had and found one that seems to work. The short circuit is between the
metal 'plunger' and the terminal. There is a raised area on the gear selector that depresses the plunger when
in neutral, closes the circuit and the neutral light comes on. It seems a slightly strange to me, using gearbox
components as part of the circuit, but obviously works (as long as the switch is OK).

I fitted that switch and the neutral light now works as it should. However I still need another switch as the one
that worked came from a G5 engine I have on the bench which now does not have a working neutral switch.

AshimotoK0:
you are right the spring loaded contact comes into contact with something inside the gearbox possibly. manual is very vague on it and last time I stripped one of those engines was in 1986. On the twins its an oval shaped bit of plastic with a brass section moulded into it but can't remember on the 400F. On the 250/350 twins the switch is open to all of the chain flung grease etc as it's in the transmission cover, so actually  a better (slightly) design on the 400/4

My copy of Honda shop  manual is here BTW


https://www.dropbox.com/s/zh31qynxfimw8pb/400_4%20Shop%20Manual.pdf?dl=0




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Chris400F:
Thanks Ash.
Yes, the switch comes into contact with what looks like half a ball bearing on the selector drum.
You can see this down the hole for the switch but I can't get a decent photo of it.
On the G5 twins the switch is also in the transmission cover with just a metal guard to keep the worst of the grease and muck off.
Can't be that bad an arrangement though - that is the switch that worked!

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