I'm glad my China girl was asleep when ya said all this and didn't hear it LOLdmar836, although in many ways I agree with you - honestly, these Chinese engines really are just toys.
There's a happy balance between what you've described and wantonly banging on it with a rock. While care should be used and you're absolutely right that only one mod should be tried at a time - when it comes down to it, they're $50 engines and perfect for experimentation. I couldn't think of a simpler, easier engine to learn the basics on and part of that learning is hacking stuff up to see what happens.
While I wouldn't solder and drill a jet - it has nothing to do with precision as they make great jeweler's bits perfect for such things, I'm simply too lazy to bother lol and while you shouldn't rebuild in a mud pit of course, there's no real need for the "lab coat" approach - part of the charm of these motors is being able to do a top end rebuild on the side of the road with a 10mm and $15 of parts.
Personally, I love doing dumb*** stuff to my motor with a Dremel and file - it's part of why I bought the silly thing lol
You are absolutely right seems like the shop teachers would be all over using these things to teach with.
