starting issue

The left cylinder won't fire up. Thanks in advance!!! Your insights are much appreciated. The Bike: ‘79 CX500 Custom Bobbed about 10 years ago (hard-tailed, pods, etc). The Condition: Sitting for 5 years New battery Plugs were new when parked 5 years ago Ignition switch is new Cleaned...

My 1979 CX500C has come down with a couple issues. The horn stopped working earlier this year, and the running light in the back doesn't work as of last time turned it on. All other lights work, including the brake light and all other running lights. My fuses are all in working order. Last time...