On my first build..New to these 2 cycle engines, doing my own mechanical work for over 46 years, I thought so also. But NOT with these Chinese no quality junk. Blew the head gasket on my first engine (as it came in the box) in less then 100 miles. Maybe you got lucky.. But if you NEVER blown a head gasket or striped out a stud, or broke a mount then you had magical workers that put yours together. Which I kind of doubt. I bet if we took a poll of those that installed a engine out of the box, and asked how many had problems, with striped threads, blown head gaskets (can't count mounts..that is a installers error) you be surprised. Besides more noobs to these engines, wouldn't think of doing it unless they read it on a forum, or a mechanic. You all keep installing it out of the box, and be prepared to tear it down. You do yours, I'll do mine....to each his own.