I hope I picked the right off topic place for asking for help.I Googled this question before coming here with it and people are all over the board with the right answer.I have a Honda front wheel drive push mower with the GVC160 engine.I am hooking a tach to the plug wire to adjust the RPMs.I need to know how many times the spark plug fires per revolution to set the tach up.My choices are (1) spark plug fires twice per revolution,(2) spark plug fires once per revolution,(3) spark plug fires every other revolution.I called a Honda service center and there answer was bring it in we will set the RPMs for you and would not give me the answer,.Please don't just say try each setting,someone out there knows the truth.Thanks to any small engine guru that can help me.