Ryobi 31cc question
Good explanation tkg. I agree with you completely. Lets not forget, the weedies are aimed at the sport flier as an economical power plant. If you want auto advance simply purchase a CH unit with auto advance.
I have a Ryobi with the fixed timing CH unit and it works great. If you want to advance the timing for a better high end, simply move the pick up a few degrees. On the other end of the scale, we are presently flight testing a stock Homelite 25cc with 7, 10, and 15 degree advance using the magneto (flywheel, coil) ignition. On the ground we are getting 8750 rpm on a 16*8 APC with the 15 degree advance unit. I'm sure its unloading well above that in the air. The engine 'hits' a little harder at idle but I wouldn't consider it a rough idle. Our Homelite project should be complete this month (Hooray) and we should start on the Ryobi by the first of september.