JERRY!  I love my OS .70 Ultimate, and i agree that the OS line is very fine, indeed. I ran a little defense on the OS motor in another forum.  OS is like a little jewel of miniature internal combustion... but more expensive.  With this unfortunate flyer, did you see where he was "new" to the hobby/glow motors? He may have encountered the same issues with any brand of model motor.  Once you stick a screwdriver into that carb there, anything is possible.....