Thanks for the link. I've been following it on the Homebuilt Airplanes forum; are you 'billsrv4' over there?

I've been trying to find a throttle mechanism in the video, but don't see one. Are they using the custom 'in the housing' butterflies, like the original Powersport engine? 

Have you heard it run in person? If so, does the muffler work as well as it seems to in the video? (Hard to know how much the audio is clipped in level on a recording.)

Thanks,

Charlie