Dear Prot, I would appreciate a more constructive comment than a negative one. Do you know what exactly causes the so called engine vibration? If you don't know and you don't have a solution for it then just read on and keep quite. The so called engine vibration may be just rough engine idling caused by poor quality fuel. I have experienced in my previous ride where changing to a better fuel helps rough engine idling and lessen the engine rattling noise. So there's no harm trying this out. I am just trying to help a fellow member to solve his problem and not selling snake oil here. Enough said.