[pete]

Originally Posted by katflap

I would check the clutch switch as well.

For the starter relay energizing circuit to complete it needs to ground through either the gear switch in the neutral position or the clutch switch closed ( lever pulled in).

My simplified wiring diag below , hmm, helpful or confusing, I can't decide

Attachment 8679

if there is a diode where you put it...
the starter button is feed with AC current
from the rectifier.. not DC from the battery as you have it drawn..
unless the start button is very big and can handle the DC amp draw..