The MHD uses a larger alternator and a thicker belt.
when you stop, the motor shuts off, when you push the gas the alternator acts as a motor and spins the engine. it is very seamless.
there is no engagement of gears, no sound, just goes.
it is like a gas powered golf cart, if you have ever driven one of those.
step on the pedal, the motor quietly starts and you drive off.