RE: Noobie needs a little engine advise
It's not a bad idea to use the trainer as a break in tune up plane for the four stroke, the four stroke is quite a bit more engine then the LA. The metal mount is something that is recommended for four strokes so they don't flex the mount. If you buy a new four stroke mount from any of the manufactures it will be metal. I have used the Saito 100 in the 4* 60 and it's about the perfect combo, the .91 should be just fine.