Hi, I have just bought a Gilera DNA 50cc GP Experience 2 Stroke for cheap. I've got this problem with the bike where I apply the throttle and it takes a few RPMs before the wheel even starts to turn. It would do this to the point where every time I stop at a junction, I have to over-rev it to even get it to move. It is derestricted, has a sports exhaust but everything else is standard. Do I put a 70cc Kit and 19mm carb on it to accommodate the de-restriction? or is it another problem. Any help would be great!