Do you have a temperature gun? Because I don't see how you know you didn't overheat it without checking the temperature.

BTW, does it 'pop' when you pull the pullstart? by defualt these motor's don't have barley any compression so he may just be misjudging it.

Try turning the LSN 2 turns out from closed and turning the HSN 3 turns out from close (that's a base tune.. it should start right up 3-4 pulls with that).. If it doesn't you've got bigger problems.

-Josh