My H bridge is a commercial board. And yes, I did read the L298 datasheet.
A understand that there is a 1-1.5V loss of voltage. The 3.3 volts Tamiya motors however should work well even in that case as there is a 5 vots input from the batteries. That´s why I am so puzzled about these motors not moving at all.
So far even with all the valuable help I couldn´t get this sorted.