My bike won't start!

I just added risers (or played with the windshield or moved my handlebars) and now the starter only clicks.

This is the infamous clutch/starter interlock switch disconnect trick. It's almost a given that any fiddling around the handlebars will disconnect the safety switch that plugs into your clutch lever and the starter will simply refuse to turn over no matter what.

Look at the base (inside) of the clutch lever assembly and you'll see a wire with black plug on the end (probably only separated from the lever assembly by a fraction of an inch). Plug it back in and you're good to go.