RE: Spinner question
From the sound of it, you have a Dubro prop nut. Prop nuts are not just for 2-strokes. Just use the prop nut in place of the nut and lock nut that came with the engine. Get it good and tight. If you are using an electric starter to spin the engine you don't have to worry about backfire. I use DuBro prop nuts on most of my engines up to Saito 1.8 without any problems.
Rich
---------------------------------
Wyoming Wind Festival Jan 1 to Dec 31