Hmmm...

Aren't O.S. Engines manufactured in China as well?

My SuperTigres run just fine, as do my O.S.'s...

The OS is far easier to break in and get going though. Once the SuperTigre is tuned up, there is nothing wrong with it IMHO.

Now back to the GRIEF with the Evolution engines and their horrid limiters, and that's another matter.