Whos blown a motor ?

That is definitely not the way to go to make power. A "perfect" mixture is better and makes just as much or more power than a too lean mixture. You can not re-bore these engines either.

Wow....that's a pretty personal question...

...but seriously, you are better off using the best oil you can and running an acceptable ratio, if a little high. With prper break in and quality 2 stroke oil, some peoplr run 40:1 without a problem, but I would hate to make that a blanket suggestion because some engines will not take it.

Too little oil will most definitiely screw the bore up. and though unlikely, could lead to a snapped con rod and ventilation of the crankcase.

leaner fuel to oil mixture or lean fuel to air mixture?

Mine died today not from running lean in any way just old age, she was singing along flat out and just lost power but i was able to putt home, just.
On inspection i thought i had turned the keyway but all was good. off with the head and barrel i found a deep groove down the barrel and the piston had a heap of extra play in every direction. strip piston off and the gudgen bush has a huge piece missing where did it go? welded itself in the piston rings and welded them shut! and stuffed the barrel, the loss of power. cheap fix!
alot of porting to do again!
steve