I was hoping that it was a low speed idle setting, i still do, but my g-51 is doing the same as both of yours, does this mean a bum product line?
I ran it with the exhaust disconnected, and got better results oddly enough, I think I was getting far too much fuel in the engine, with the exhaust connected Raw fuel was spewing out, at the recommended High speed idle setting for break in, I have managed with much effort to run two tanks through it, but I am starting to think its a crap engine....oddly enough, I have a ST 75 that is bulletproof and unstopable, as well as a ST G2300 that is the same, no problem, maybe a flaw in the ST 51 series?