Whups, I meant degree wheel. You use their "degree wheel" to set the CTC ignition. 28-32 degrees Before Top Dead Center (BTDC). BTDC can be found, with the plug still in, by rocking the crank shaft in that little bit of play. Mark it right in the middle of that play.

Thanks Jody (man I'm dangerous).

http://www.ch-ignitions.com/timing.html