I've just bought a Haibike Sduro fullseven 6 LT ebike and it's great. However, after doing 30 miles I've noticed that the pedal engagement is quite clunky. If I'm freewheeling and then peddle there is aquite a loud clunk as the pedal engages the drives. I can feel it through the cranks. It's more noticeable when dabbing the pedals. If I spin the back wheel and then move the cranks until they engage I can feel the clunk every time. It feels like quite a hard clunk. Is this normal for a Yamaha engine ? The engineer in me says no. I compared it to a new bike and the new bike has a clunk but much softer.