That's the pig-tail to the battery, for the battery tender, hanging out of the air slot in the front panel (the one we remove to adjust the valves and replace the spark plug)
Saw 'scooter in the sticks' guy doing this on his Vespa. I didn't have to do anything special - the wire lays down with no issues when I put the battery cover back on.
Come spring, I'll tuck it back in the battery area.
Very happy to be riding again today!(even if I have to push it a few 100 yards at 4:30 AM to get clear of the ice on the roads. 7 degrees)
Stig