Stihl MS340 / 034 HydroLock?

[Klaplante420]

Was running fine. Got home. Tried to start it up again. Cord oulled iut of my hand as the piston reached the top of the cylinder. 

Checked exhaust. No blockages.
Removed spark plug. Pulls fine. 
Reinstalled plug, a little loose, and could hear air escaping from plug when pulled. 
Added a few ml of gas, pulled over and over, turned upside down and drained it. Still no good.
Checked gas line. No bloackages that i can tell.
Pulled the carb. Cleaned it. Still wont pull. 
All gaskets i came across were in great shape. 

What eles could be blocked that is causing this pressure? Im no mechanic and have no experience with 2 stroke motors or chainsaws. 

[Michael]

check the thread "Stihl can't start my 310". Read it