Well you sure don't want the bike cutting out when you least expect it,,, it is like jamming on the brakes during a left turn,,,, and you are going down !! Now I have no experience with the ST11 what so ever. But I did have a very similar problem with my CB1000c,,, which would cut out during low speed turns and bumps. The issue was inside the ignition switch,,, and required disassembly, cleaning, lube,, and a bit of repair to the internal electrical contacts and insulators. Can you grab the harness and dublicate the cutout by moving it in the same motion that is created when turning the bars left ?? Cat'