The old loop scavenged K&B 61 will hold its own power wise compared with the modern day schneurle ported 61.

A friend has a Telemaster with a 91 two stroke. It is not over powered by any means. I suppose all that wing area absorbs the power?

The plane is a floater on landing.

But granted, a 91 better be tuned up good so the engine will not load up at low throttle settings. Otherwise, there will be a lot of dead stick landings.