One thing I do is to rtv the mag cover and where the wires go into the motor to prevent any water or moisture in the magneto. I cannot count the times I have ridden in the rain.
I don't like riding in the rain during winter gets a little colder then I like. But a ride on a nice summer rainy day is awesome!
I could not video my ride in the rain or I would have killed my camera, but here is a ride after a summer storm.
Motorized Bicycle After Thunder Storm - YouTube