": 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<br>could be the transmission oil<br>or the level of this oil<br>or the quality, maybe renew ?<br>regards, alfons<p><br>"