I should mention that, by nature, wet clutches suffer from something called viscous drag, particularly when they're cold. Viscous drag occurs when the viscosity of the cold oil creates enough drag between the plates to transfer some torque, even though you're holding the clutch in. If the drag is severe, punching the bike into gear can result in a loud clunk and maybe a small leap forward, or even a stall. Normally, this is only a problem when the bike is started for the first time on a cold day, or too heavy an oil is used, but the solution here is simple. Just let the bike warm up for a minute, preferably with the clutch disengaged, during the first start of the day, before putting it in gear.