The 3W and DA pickups are not hall sensors, so turning the prop slowly will not generate a spark..take the plug out and flip the prop fast, as in starting, to see if it sparks...Put the spark plug in the socket when you try this, and watch carefully, a .015 spark is hard to see....The plug is grounded through the outer braid on the wire and does not have to be touching the engine...[8D]
Also be sure you have the polarity right on the connections, it won't work very long, if at all, with + and - reversed......