As for the 65LA having more power, that is not true. The 65LA is rated @ 1.7bhp @16000 RPM. while the 61FX is rated @ 1.9 @ 16000 RPM.
Sometimes we get hung up on power ratings. Do you know of anyone that runs their sport plane @ 16000 rpm when flying? That speed is not attainable with props that are used on most planes. I would rather have an engine that idles reliably, and starts good rather than one that will pull the firewall off. Don't get me wrong, I like power, but if a bushing engine will do for me what a PRO or BB engine does, I'll use it and save some bucks in the process....Just my opinion.