Hi Paul,

The small(med) size gas tubing will work fine on this motor, though some people do use large. If you do, you'll need to put the large tubing in your tank too. I am using the small tubing.

Yes, you will need an adapter kit from Tru-turn, and if you don't have access to a machine shop, you need them to precisely enlarge the hole in the spinner backplate to the correct diameter. It is VERY important this is done accurately. Don't do it with a drill press!

Bill