Hi i was just wondering. i was giveing a 2003 175 yamaha 4 christmas and im real happy with it how ever i have found it to be a bit gutless it doseĀ“nt go over 85 km an hour is there a problem with it or is it just the way they run because i know they are a learners bike but i think they would make it to go at least 100 km an hour. i have herd that this type of bike has ristrickters in them is this the problem ?.