I just purchased a used 2003 Reflex with 16,000 miles. I have heard others say that it will travel at a high speed of 85 MPH. I have had it up to 75-78 MPH. I can only assume it will go 85 down hill!!!! I was looking at one of the scooter dealer websites and they offer a top end kit, piston kit with engine body, for about $500.00. It will take the displacement up to about 289 CC´s. I would think that this modification will take it pass the 85 MPH.