Well, big ABC engines may not be any harder to start after you break it in, but brand new out of the box they can be a bear.

Now that my Magnum XL1.08A is fully broken in, it turns over nicely and I can easily start it with a cheapo Tower starter. However, new out of the box it was so tight it creaked going over TDC like a duck being slaughtered. I had to buy a Sullivan Dynatron and put it on 24V to start the sucker.

This is why .91 - 1.08 is the upper limit nearly all manufacturer would built ABC engines. The 1.20 and 1.44 MVVS 2strokes are twins, so the individual cylinders are really .60 and .72 respectively - well within the practical limit of ABC engine size.