Setting the ignition timing by means of a battery and bulb

Insert a battery and bulb between the engine and the moveable contact of the vertical cylinder. Rotate the engine in the direction of the movement and set the contact so that it opens exactly 10° before top dead center. When the contact opens, the bulb will go off, allowing you to check the advance and make any necessary corrections.

For the other cylinder, follow the same procedure but rotate the engine 270° after top dead center.

During this entire operation, remember to set the contacts gap at 4 mm.