The Versys, as all bikes that have multiple carbs or throttle bodies do, has a mechanism to sync the throttle bodies. You are subverting that mechanism by linking the throttle bodies. While this may slightly tame an engine that is grossly out of sync it will not make it as smooth running as it could be if you understand how the intake system works.
As the intake valves wear one cylinder may suck in slightly more air/fuel than the other, due to better intake and exhaust valve sealing, causing one cylinder to have a greater power pulse than the other. The syncing process compensates for this by restricting the intake on one side more than the other smoothing things out and balancing the volume of air/fuel in each cylinder. Because the Versys has an uneven firing order, 0, 180, 720 degrees attaching the throttle bodies together will subvert this - the second intake stroke, which closely follows the first will be negatively impacted by the vacuum in the first throttle body, if you join the throttle bodies together. The engineers who designed the engine knew what they were doing.
If you want smooth running engine get hold of a sync gauge and sync your throttle bodies as the service manual describes. Ideally it is best to do this once a season or every time you change your oil every 12K km/7200 miles. It is critically important to do immediately after a valve clearance adjustment.
Last edited by twowheels; 09-22-2017 at 06:03 PM.