that sounds like a loose/corroded connection,have a look at all the connections make sure there clean and secure
Hi!Old post, but I am facing this problem now. While I was driving speed and revs "needles" were dropping to zero, then crazy jumping and then again back to zero. This stopped when I turned on turn indicator. I stopped and when tried to turn on motorcycle it was dead (no signs). Previous owner had installed battery main switch (I guess he had faced similar problems as it is installed), I turned it off and on and then everything seemed fine again. I started motorcycle.Would you suggest me to check contacts and tighter wires on battery? Could it be ECU?Thanks!