"Hello,<p>I've got a Puch Maxi Europa, and since a week or so it's been acting strange.<br>Every time when my Puch must some hard work, for instance when I'm pulling somebody behind me on a bike, he starts to make really loud knocks that I can feel all trough moped. These knocks come every 2 or 3 rotations of my wheels. They don't seem to come from the cilinder so it's no bad ignition or something. Can it be my clutch? It's an automatic moped, and I don't know how exactly how this works so it's just a guess.<p>Please can anyone help me?<p>Thanks, Bart Dubelaar<p>"