The spark advance module actually retards the timing on start up with the other necessary parts of the system being the flywheel (with the key slot actually offset to advance the timing), both mags, and necessary wiring. Most of the time they work fine, although occasionally some do act up, usually causing a hard start due to the timing being advanced during start up. Now the good part! The spark advance system (module, flywheel, mags & wiring) will actually increase the engine 2 horse power from a 20 to a 22 hp (small bore) and a 23 to a 25 hp (medium bore) and 25 to 27 hp (large bore). Back in my pulling days I ran the flywheel only advancing the timing all the time, so to prevent hard starting I also had a kill switch on the dash allowing the engine to crank over before I threw the spark to it.
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