RE: Quadra 42 Help!
Yes
Whatever
Yes
I don't have any idea.
OK, starting over ... you can get Quadras and parts from Bennett Built.
The gas/oil mixture required is pretty much whatever you want. I started out with conventional oil in mine at about 32:1. I now run Amsoil at 100:1 and my Quadra is happy as a clam.
I got a CH ignition on one of mine (actually a US41) and it works fine.
The Quadra 50 is a different frame engine. I have no idea how the reduction drive is configured so don't know how it would mount on a 50.
Good luck!
Bedford