Sboxer,
I have a question for you, could you please let me and everyone else in this thread know the exact model and serial number of the trimmer. I have a few Ryobis that I got from a mower shop just waiting for rebuild and I would like to use the double ring piston, if it actually has it. A quick peak in the exhaust opening would verify this. As far as balancing, Im getting all the flywhels machined down that I have and the guy doing it says the are pretty close to balancing from the factory, as long as weight is removed evenly it shouldnt be a problem. Not that I doubt him, I do have the Dubro Tru-Spin Prop Balance (#499) so for laughs and craps (poops and hahas) I will check them to be sure. Im thinking everything you can do to these little engines to improve performance will be a plus. One day when the money flows in, which it never seems to do, I will look into electronic ignition. ALW