That is a shame that you will need new rings on a new engine. I have a DZY 48cc twin in a GP pitts, it is a perfect fit in this plane. I have not yet run the beast, but I'm very close to finishing this project.

What size prop did you use on your DZY? Would a MENZ 21X8 be too much for this engine?

I have two other small twins, a 3W-48 that is very powerful, and a RCS-44cc that is similar to the DZY in power with a rear carb and rotary valve induction.