Hi Rikard,
I am not very technical, but perhaps a couple of my thoughts will help get your answer - I don't mind commenting and getting shot down!
I think it is only the older bikes fitted with a magneto that will start without a battery fitted (ignoring the offered battery elimination kits you see on Ebay, etc...). Our coil system requires a battery. I think I would look to the alternator not supplying sufficient charge first. The Clymer Manual has the testing method to be followed - do you have a manual?
My gut feel is that the regulator would give you a more concrete problem if it was at fault (i.e. the bike would just not start). Fyi, there is no testing procedure noted for the regulator.
Hope you get to the bottom of your problem.
Ciao, Geoff
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