I did some looking around. Here are my conclusions. I wouldn't like a .61FX because it is the same size as the .91FX so I rather have the 91. If going to 4 stroke I was thinking the Saito 100 since it is light and powerfull, and isn't much bigger than the 61 size we taked.
What do you think?
If going 2 stroke I would like some other engine other than the OS 91FX since I read so many problems with it I think it isn't a good choice. Any suggestions?