No balance. On cars, ears can be in various places from left to right. However, on a Wing, ears are pretty much always centered and the same when they are in a helmet. Therefore, there is no need for a balance control. Your issue is almost always in aftermarket cords or in the headset. If your helmet has a pigtail hanging from it, be sure to check that one too.
Try to pull the connector where it plugs into the bike out @ 1/16". Some connectors are made differently and if they ground against the bikes connector, it wont work.