RE: deja vu
Ozpulse, how does that one run? I have toyed with the idea of doing a reed valve Homelite 30, but with a better reed valve assembly. What differences do you notice with the reed valve? Slightly better low end, and better starting/idling characteristics? Did you lose much power?
ckangaroo70, The stock Ryobi has a restrictive muffler, a tiny carburetor, a poor ring setup, and sometimes very low exhaust port timing. Modify the stock muffler by taking out any and all baffling and making much larger outlet(s), or purchase a good aftermarket muffler. Put an 11mm Walbro two needle carb on it. Modify the ring pin in the piston to accomodate one of Frank Bowman's notched rings, and install a Frank Bowman ring. Check the exhaust port timing. You may find it as low as 120 degrees. Raise the exhaust port until you get a 150 degree exhaust duration. (Be sure to lightly chamfer the port edge afterwards.)
The other thing is if you can find one of the older cylinders without the "slits" in the cylinder ports, they are better.
You will be pleasantly surprised with the power you pick up from these mods. They are all proven and work. You will have to go to a larger prop to keep the static rpms down to 7500 rpms. If you want more static thrust, go to a 19 or 20" prop with a 6" pitch. If you want more speed, go to an 18 x 8 prop.
AV8TOR