I saw one of these at my field this past Sunday. He had an OS 1.60 with an after market canister muffler. Flew great! I ordered one the next day and plan to put a Saito 1.80 on it.

The 1.60, I believe, is about 8-9 ozs less than the Moki. It's ashame that your CG is that far off from what others are recommending because that would be a fantastic engine on that plane.

Did you add anything to the forward part of plane that may have added more weight (i.e. smoke tank, remote glow battery, etc..)?

Good luck with it!

Jon