RE: Capability of DYNATRON starters?
The problem is most likely your battery not being able to provide enough amps. Power is watts, IE volt x amps.
I can start my Saito and magnum 180's with a trusty 30 yrs old Sulivan starter. A model shop gell cell is insufficient. I use a yard tractor battery or hook to my car via jumper cables. Wind the prop back to compression before applying the starter.
Another trick is to close the throttle completely, spin it up then open to low.