It really doesn't take much compression to start and run 2 stroke. If you can put fuel in the spark plug hole and it runs then it should have enough compression to run on its own. Maybe not the carby. Did you check the decompression valve it maybe stuck open and not allowing it to run on its own. Also check to see that fuel is coming out of fuel line,in a nice flow. Just pull fuel line off carby and open tap. Maybe the filter is blocking a little. You just have to go back to the basics with internal combustion engine. My formula (what I always say) is suck squeeze bang blow. Now we know it can squeeze band and blow,so we just have to work on the suck part. Don't give up you'll get it.
