hi Peter, i had very similiar issue few months ago, but my issue has evolved and i wasn't able to start the engine several times..once the engine turned off when i stopped on red lights....first one in a row of course.
anyway, the problem was in voltage regulator. i bought a new one from aliexpress and since then everything is working fine and I can finally ride with main beems on
in addition to this, if your regulator is damaged (one of diods might not work properly) it can cause damage of stator, which is much more expensive part.
unfortunately, it seems that voltage regulator is a common issue in downtowns, i have friend who had the same issue. both of us had approx. 25000km when the part died
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