Any problem like this is best fixed by calling the manufacturer...If it has the C&H ignition and is timed for the Falkon it will never run....
Falkon timing is 2 degrees BTDC, C&H is 28 degrees BTDC...
Take a spark plug wire off and slowly rotate the crank counterclockwise..Make a pencil mark on the hub and the case exactly where you hear the spark...Put the engine on TDC..Measure the distance between the marks...If they're realy close it's Falkon timing, if farther apart it's C&H timing...The exact distance between the 2 marks will be found by multiplying the diameter of the hub by .244..
For the Falkon ignition the distance is almost too small to worry about, a few degrees either way makes no measureable difference in performance...