I can't say I've paid much attention to this before... The other day I was messing around popping wheelies, had the bike in turbo mode and was going from very slow riding to putting the power down then stopping peddling. I noticed that when I stopped peddling the motor would continue to drive the bike for maybe a second before stopping. Is this normal for the Shimano motor? I would have expected the motor to stop almost straight away or is there a lag in detecting the lack of pedal input before the motor turns off?