Check under "Husqvarna.com" and click onto "Products" and then "Specifications" where it list the decompression valve as an "Air Purge" which is on their 350BT X-Torq engines.
Sorry ....I have a 350BT and not the 130BT which I posted in error....Am still looking for the "Decompression Valve" which I suspect to be on the top of engine, however will need to remove the plastic couling to confirm if it is operating properly.