Jester, I do not know what ignition you are trying to adjust the timing on. Some flywheel mags have a advance curve built in, and seems to be perfect for best idle, yet revs up real good also. The engine I am talking about is a Mac MB290. You will see in photo below, I found this out with a timming light. I cannot wait untill they come up with a super light mag that will give good spark and weigh 1/10 th the weight. The rotor could be more flat and the coil could be thinner and hang in place a brake rotor. Come on guys...get to work and design one!!!! Capt,n