Timing issues, Bosch magneto/ laurel cylinder head

[rotorwrench]

In aviation, we use a magneto timing light to set the timing for the exact time the breaker points open. They are made to set two mags at a time so that they can be synchronized. On a single mag set up, only one of the lights would be necessary. It sure makes adjustment a lot easier and more accurate.

https://www.aircraftspruce.com/catal...r_12-16901.php