I recently bought a gs500k6, my first bike. I read that it is quite easy to adjust the preload of the rear suspension. I have checked mine and it is on the factory setting of 4. The bloke I bought it off was a pretty big guy ~120kg. I'm 100kg. Should I turn it up a bit? As it is my first bike and I haven't riden any others I'm not sure how soft/hard it should feel. Is there anything you can measure to indicate that it is the right setting for me?