From another board. No key / bad switch or other problem to get it running.
Best way to try it just hot wire it about all jap bikes are easy to start don't need a key even, run a hot wire from the positive side of the battery to the ignition fuse on a gl 1800 that's about eight inches, hit the stater it should start.
Had a bike with a bad ignition switch that's the way we got it started I wired a toggle switch in the hot wire so the guy could shut it off that got him back home.