I was given a 128LD with LE720 Edger attatachment. Previous owner was frustrated with it but I don't know how/if they trie to fix it--i.e. no Repair History given to me. First thing I did was to dump the fuel tank into a glass jar (yep, small amount of water was found) then refill the fuel tank to about 1/2 inch deep with fresh 50/1 non-ethanol fuel (same fuel mix/jug that runs fine in my Husqvarna 223L Trimmer--i.e. known good fuel). Following prescribed starting procedure the engine starts fine on Full then Half Choke, although it races/HighRPM on Half Choke. Moving to Choke Off the engine dies, throttle cannot keep it running. The edger blade rotates continuously during all this. Before I dig deeper into this problem (i.e. replace fuel lines, disassemble carburator, etc) any hints what I should look for? My experience with outboards/mowers/chainsaws/trimmers/blowers leads me to a hunch that engine is starved for fuel i.e. leaning out. Therefore either a constricted fuel line/filter or something else in the carb. I have done a little work but not a lot with Walbro carbs. Also, what size spark plug wrench do I need? My "socket set" 5/8inch doesn't fit, and the cheapo stamped metal 3/4 inch wrench slips around the spark plug (do I need to buy a socket set type 3/4inch? Thanks in advance for any tips.