This video is a step by step process on how to verify ignition timing on small single cylinder engines. The calculation at the end of the video that shows the distance of ignition degrees is correct for 2 strokes but will need to be doubled for 4stroke engines. 4stroke small engines fire a wasted spark on the exhaust stroke while 2 stroke fire every stroke.

LINK FOR DEGREE WHEEL: http://amzn.to/2iBD7jL