Cut the wire today as I was doing sweet F.A. so I took it out and its normal top speed was about 32MPH 34/5 downhill. Now the top speed is about 39MPH maybe 41 downhill. Thing is, on a straight road flat out it sounds like its struggling badly or is this normal? Theres no serious changes in tone or speed but it sits nicely at 39 but I tend to let off as it sounds pretty unhealthy. Though when I come to a stop it sounds completly normal