Hello, I had bought a scooter 1 week ago the brand Keeway ry 8 which is currently driving only 20 km h the scooter has got a new piston and cylinder from the owner he thought the just has to drive in then the one is back to its pace (normal speed 25 km h should be the one) naturally drove and drove.. I still 20 km.I forgot to ask the owner how he was throttled you know how to show this I can not contact the seller anymore because I am I don’t have a number anymore like I bring the scooter from 20 to 30-32 km h without going to the workshop.