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I am surprised that it is a short stroke. Neat!
I had a Webra .61 Speed back in 81 or 82 that was a fantastic engine. Not ABC, it had a Dykes ring. Wish I had it now. Maybe I'll try to contact the last known owner. I don't think that anyone flew it after I had it. It was still nearly a new engine. It was side exhaust and very light weight. I did replace the Dynamix carb with an HB carb. No one ever told me that the Dynamix was intended to be ran with a pump! I got it to run, but it was always on the ragged edge of being too lean. It loved 5% nitro fuel too.