I use a slightly different method f flipping my engines over.

I set the prop at 1 o'clock and keeping my hand as close to the center of the prop
as I can I flip the prop with a snapping action of the wrist.

The closer to the center of the prop you turn it, the faster the engine turns.
Mags needs speed to generate spark, some as much as 300 rpm.

I'd post a video but the RCVideo is down now.

Here we go:
http://www.rcuvideos.com/item/8PXSLQ2FFLSVFK62 Echo Chainsaw motor

http://www.rcuvideos.com/item/GYZZ4BDXYD2G4VVP Partners concrete saw

Both engines were cold set at 28 degrees and had the Carb primed.
The second video shows the flip a little better.