Re: ignition timing adjustment methods
highseastravler, I think that you misunderstood me. I know there are a couple of ways to alter the fixed advance, what I meant is that it's not possible to get increasing advance with higher rpm.
A pity, because that would make these little engines perform better.
For fixed advance, setting an offset to the woodruff key is the easiest way, but as exavid says, they're already pretty well tuned for all-round performance.