RE: Welcome to Club SAITO !
Vic, you can install the OS-f from the git go or run the H9, the H9 plugs are great plugs. I happen to be one who does not go along with the idea that breaking in an engine ruins a plug. My old Enya .46MKII still has the original Enya A3 that was in it when I bought in 1990. I have several Saito that have had the same Fox Miracle in them for 10 years or so. I am not familiar with the H9 3031. Keep us posted on your Saito child raising.
70 degrees, I dream about that, this was here just a couple of days ago.