I had Ralph do an OS .91 SF for me. On the bench it's turning an APC 15/6 8600 rpm. It will do more, probably 9000, but I won't push it that far. I've got the timing set pretty far advanced to get the rpm's. It starts very easily with a starter. I can start it by hand but my technique leaves something to be desired. Using a starters no big deal so I use it.

I'm running 10oz. of Amsoil per gallon of 87 octane.
I did not change the carburator, I'm using the original glow carb. Adjusting it is very touchy. I found that a Webra needle valve fits the OS carb and has a much slower taper. With the Webra needle in the OS carb body it's much easier to adjust.

I'm also using one of the 1/4 " spark plugs, works fine but expensive.

I don't have the all up weight yet, but for the power it's pretty light.