I recently had fits trying to get my GMS-47 to run well after messing with the needles too much. I ended up going back and starting from scratch using the settings from the manual.

With the engine off (duh) and the throttle wide open, adjust the LSN until the gap is 2mm. I used a 2mm allen wrench as a guage. Then close the HSN valve (whichever direction makes it go IN) and back it out 1.5 turns.

After I did this, it fired up and ran perfectly. Just pay attention to which direction you are turning each needle so you can make small adustments afterwards.

Good luck