Some of the Ryobis have a pinned ring whereby the pin is the full depth of the ring land. This makes for a very wide ring gap by necessity as supplied originally. You can carefully grind the pin down half way into the ring land, then have Frank make a custom ring the has notches that go over the pin. Then the gap can be set very tight, even zero gap as recommended by Frank. This will help power a LOT on a Ryobi. Frank will modify pistons and pins for customers if desired.

The Ryobi will also like an 11mm carb and a free flowing muffler. Hopping up an engine is always a coordinated effort. Doing just one or two things seldom has the desired results...

AV8TOR