If you get a spark when the ignition is turned on and off the ignition is good...If no spark when the crank is rotated the sensor is bad...All ignitions from C&H operate the same, syncro or otherwise...The South pole of the magnet activates the sensor...Sensors are available from C&H, they just plug in on most engines...The sensor should be as close to the magnet as possible without rubbing..They will work to about 1/16 from the magnet...distance from the magnet has no effect on the timing....Pulse switches(Hall sensors) are very reliable and normally last a long time, so much so that I epoxy mine into the engine case...
How'd I do, TKG ?[8D]