This is quite the characteristics of this particular model. The 260E is no exception. The start kicks off at 2nd gear and thus we lose the torque at low revs. You'd notice a surge of power when it changes from 3rd at 4,000 revs on.
Engine kick starts usually at the 1st crank, but commonly at 2 or 3. 5 would require more patience and perhaps a check on your ignition motor, clutch and plugs. I think.
126 tailed by a 203, 129 leading the pack.