I think jetting close means jetting as lean as you can without causing engine damage. The leaner you go the better they run till you go to far then big bata boom. When a engine is cold it runs leaner till it warms up so if it is jetted lean you have to richen it up with the choke. If yours needs the choke then I'll bet when you first start it and turn off the choke If you crack the throttle wide open real fast it bawks for a fraction of a second then grabs quick rpm, and takes a long time to die back down. As long as it doesn't have the bawk after it is warmed up I guess that is close.