Magneto Timing

The magneto timing can be checked to make sure that both magnetos are firing at the correct time i.e. the correct number of degrees before the piston reaches Top Dead Centre on the compression stroke for No 1 cylinder.  The timing can drift as it depends on a clamp on the magneto flange to maintaiin the angular position of the magneto relative to the engine block. Incorrect timing can damage the engine as well as  affecting performance.