That was my concern Dennis. As it is now if I idle for long enough the rotor speed will marry with the engine speed after a while. I don't know if that is because of over tight adjustment or just the nature of rubbing on the belt. The belt is plenty loose, but with any touching on the drive pulley I assume there will be movement. Is there a certain amount of resistance that I should feel if I hold back the rotors by hand? Of course they turn freely with engine off, but I"m sure that's because of the sprag.