This weekend I decided to find out how Seven Fifty sounds with those four mufflers I bought for project. So I spent a day to clean up CBX750 carburetors (which I bought occasionally with other CBX parts to tune-up Seven Fifty engine). Then I temporary installed wiring and after a year of silence Seven fifty sounded again. Engine sounds like hydraulic valve adjusters won’t work right, but I have intention to overhaul engine anyway, so that’s not a problem at all.
Carburetors are not adjusted but exhaust itself sounds great. Here is a short video of working engine: