A difference of only 12 bucks is a steal..C&H charges $130.95 for the single cylinder ingition with Syncro Spark...Brison probably pays C&H $102..for the system...

Not all mechanical advance systems are created equal..
My system, made for the last 15 years, uses a ball bearing ring mounted behind the hub on the crank,directly connected to the carb..The carb is turned so that the shaft is parallel to the cylinder. The servo connects to the same shaft, NO bell cranks, NO play, NO binding..Every other system except Byron Originals copied the old A&M setup....A $2.00 ball bearing is cheaper than a $40.00 Syncro spark module, and will outlast the rest of the engine....RC....