I have an Echo CS530 that doesn't start. I have blue spark at the plug, plug is wet with fuel when trying to start, has compression, but will not hit with fresh gas, ether or brake cleaner. I have tried starting with ether & brake cleaner both with carb (WT-12) on and with carb off (straight into cylinder). Blew air through carb air hose. Strong stream of fuel from hose into carb when taking out carb. I pulled carb, cleaned, installed standard Walbro rebuild parts but cannot get a single hit. I tried a different spark plug verified spark. How do you test quality of spark/magneto? What am I missing?