RE: another darn ryobi post (ryobi performance modification, analysis and comparison)
When you time an ignition set up you DO NOT TIME the location of the sensor and magnet, there are too many variables in the sensitivity of the sensor and the strength and width of the magnet.
You set up your degree wheel correctly and turn on the ignition and rotate the prop hub in the direction of normal rotation, when it sparks that's the timing. Adjust until it sparks @ 28-30 degrees BTDC.