I was reading about sprocket changes and someone suggested getting a speedohealer so they don't gain more mileage than they actually have. Well I was thinking, whats stopping someone from getting a speedohealer and adjusting it to make the bike read less mileage than actual? I know it would throw off the speedometer, but I could see plenty of people not caring about that. I know messing with the odemeter is a serious offense, so are gearing/speedohealer changes technically illegal?