What is the Syncro Spark that CH Electronics (now CH Ignitions) sells?
The SyncroSpark is an electronic timing module, which is available as an add-on, or built into the CH Ignition system. Without it, you set the ignition to fire somewhere between 27 and 30 degrees before top dead center. (DBTDC) Your ignition will fire at that point regardless of the rpm the engine is running. When you plug a Syncro Spark in between the sensor and the ignition module, you will have an engine with variable timing on the ignition. It will retard the timing for starting by about 24 degrees, so you can hand start the engine with it firing at about 4 DBTDC. That makes hand starting MUCH easier. The Syncro Spark also calculates the spark timing (advance/retard) based on the current RPM. When the engine is idling, the spark is retarded significantly, to smooth out the engine. As you increase the throttle, the module senses this and decreases the amount of retard. (Which is like advancing the timing.) This allows the engine to develop more power, since you can time it to run op
