my 147 had the same problem. was indeed the clutch switch. if its working correctly you should feel the pedal opening the switch before it starts to release the clutch plate. easy fix, twist the switch to release from the pedal assembly, remove the wire connector, disasemble the swith by releasing the plastic clips, inside youll find a metal clip that slots around the actual shaft that the clutch pedal presses, this clip slides too far up the shaft causing it to slide inside the switch housing. remove the metal clip an replace it near the bottom of the shaft. you may need a bit of trial and error to get the right length of shaft exposed.