You need the engine running to change the preload - perhaps you just had the ignition on? For the preload - set to one helmet on comfort and get off and bounce the back end, you should feel a well damped but fairly soft bounce, if you know what I mean.... Static sag around 25mm or so. Now set to 2 helmets - the bike rises up. Still on comfort, you will hardly be able to bounce the bike at all and will have no static sag, set to sport and should feel just about rock solid.