Paul said, to truly gage throttle response the engine will need a prop
but it apparently reacts instantaneously in the dyno.      Jerry

Jerry, Saw the comments about the muffler, did it have the long rectangular exit? I still have trouble about the VAM pipe, since they ran it without a tailpipe. (wihch was totally necessarry to the design) I know they couldn't fit it on Tracy's test stand, but I wondered if your pipe suffered the same fate? Thanks for the offer of the updates of the other list if needed. I really don't know what the problem is. Flyrotary gets bounces too sometimes. On your machining problem, you can order a custom sized reamer pretty easy from a machine shop supply. Takes about a week and they aren't even all that expensive.

Bill Jespon