Hi. I bought a Aprilia SR 50(1995) last week. Since then I had unfortunately already 2 piston clamps. The scooter braked strongly, went out and screamed grossly. After one hour of cooling it has jumped again. How can I prevent the next piston clamp the next time? I have already tipped some extra oil into the petrol tank, hoping that the engine will be better cooled and lubricated. I have seen that the cylinder cover is missing, which is why the engine could probably overheat. Or maybe the oil pump is defective and I can check it? During the ride I often hear a noise that sounds like a circular saw is cutting or as if someone is flexing with a flex. I thought that was the cooling, but maybe this is also a symptom if the piston rubs badly on the cylinder? Would I be happy about your experiences and tips. t had already others the noise while driving.