May I ask if he is running a metal spinner on this engine?

I have a YS 1.10 on a Skyshark 109G6 that requires a large diameter spinner.

I had an incredible amount of vibration that was caused by the spinner and backplate assembly.

Once I ground those parts into balance with a sanding drum on a dremel tool, the whole airplane smoothed out.

I have noticed that of all my YS installations this one has the slowest and smoothest idle, I guess that big spinner is helping out with its flywheel effect.