tell the idiot that told you that to learn how to break in an engine and tune them. I haven't seen an engine yet built since 2000 by the major players, O.S. saito, magnum YS GSW and a few other that have mass produced dud engines. Tune it properly and it will pur like a kitten, that's of course if it wasn't ruined at break in.

Ajust the engine to peak RPM then back off about 3-4 clicks. you'll hear a slight drop in RPM. If it doesn't respond then the engine probably isn't fully brocken in. then set to idle. I use the pinch method. pintch the fuel line for a couple seconds and listen to the motor. if it speeds up and dies lean the idle out. if it just die richen the idle. if it maintains it's fine. advance to full and reset the high end, then recheck the low end. do this about 3 times, it should be a rock solid setting