Timing your Magneto is easy with the simple tool made for magnetos that has been used for years properly named a "buzz box".  Below is a link to step by step instructions on how to use one.  If you do not have one, we stock them.  Use this link to get your Magneto Buzz Box from SpeedMart.

http://www.speedmartinc.com/documents/Buzzing-A-Mag.pdf