Hi,Bryan! I don't think the moped would run at all if a major adjustment screw were missing.That looks like a cover screw for an orifice or jet of some kind.You might look down in there and see if maybe some small passage is plugged,i guess.Remember earlier I said to clean the exhaust port?Did you do that? It doesn't matter that the muffler is clear if the port at the exhaust opening is restricted.BYE!
Re: Yamaha QT 50 oddity
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