This is the Homelite/Ryobi engine, made in China. The cylinder has excellent transfer ports but can use some help on the intake and exhaust. Properly modified, it should make serious power. I don't think parts will interchange with the early Homelite.

Today I got a new Homelite 30cc Yard Broom II for $80. This is the same engine as the Ryobi 30cc long shaft. I am in the process of matching the transfers to the crankcase and porting the cylinder. The intake manifold mounts the carb with the shaft vertical. This cylinder has a larger exhaust port but it is seriously reduced at the piston, it will require a lot of raising to get adequate exhaust timing.
The intake port is very small. I will post results when they are avai8lable.
The crank is different than the trimmer, there is a flat to drive the impeller and the length is different.