[Christ]

It's a very small, air cooled engine... it's going to be pretty susceptible to leaning out.

You could give it a try with an accelerator jet/pump, but that's going to add some complexity to the system overall, won't it?

Even with the idea that I had, you're still going to be running weird most of the time, because load still changes with throttle angle and situation, and you're not compensating for that with any sort of manifold pressure or airflow readings.