Hers somthing else to try.i hand start most all my engines but you must set it up this way to make it work.
Prime engine good first,rotate at least 4-6 times with finger over carb opening or choke.
set magnets on the flywheel at the 1-2 oclock position from the front of flywheel like looking at a clock.
set prop to line up between or in the center of both magnets.if theres three line up on center of middle one.
the secret if there is one is to get the prop to move fast past the coil in the space from the starting position(1-2 oclock) to the coil.you must flip it fast in this 2 inch arc.not forceful,just fast.remember the hand slap game where you put opponets palms on one another and the object is to slap the top of other persons hands before he moves,this is basiclly the movement.i hand start my echos,zenoahs,homlites,sachs,huskys all the time this way.