My Homie 30 also doesn't have the performance I expected. I am getting 6900 RPMs with a 17 x 8 prop opened stock muffler, stock carb and on magneto. It is starting to appear to me that the Homie requires more detailed modifications to extract it's potential.

My first and only other convert, was a Poulan whacker engine. I took it from 5700 RPM to 7200 RPM on an 18 x 8 just by changing some parts.