Hi all, I originally wanted to power my 4*60 with a OS61FX but I am thinking of going four stroke now. I have a bunch of questions I hope I can get some help with :

1) What is the equivalent four stroke engine to a OS61FX ? Is it the OSFS70 or OSFS91 ? Where can I get a "2-stroke to 4-stroke conversion chart" ?

2) I notice that OS offers four stroke engines with and without pump. What is the purpose and pros/cons of the pump ?

3) Can I use the same engine mounting provided in the 4*60 kit for mounting a four stroke ?

Thanks a zillion !...............