Before starting the bike be certain that the throttle closes onto the stop in the carb. Listen to it clicking when you let go of the throttle. Try this while you go from lock to lock with the handle bars.
Hi Mike,
If the headlight flasher works I would think that the power for the dip/main beam will be sourced from that possibly from the left switch gear internally.
Check with meter or bulb.
Happy New Year.
JK