from what i can see in your posted pic..you only have one carb on that bike ?..if this is the case..your understanding of synching the carb is alittle out of bounds...lol..when it comes to synching carbs..this calls for more than one carb to adjust..or..in the real world..synch..which...means all carbs work at the same time..as in..all butter flies opening and closing at the same time..this is called synching the carbs. as for your bike..all you need to do is make sure your not running rich or lean..you do this by adjusting the main throat jet needle...it should have 5 grooves with a very small c-clip..most stock settings are with the c-clip in the middle groove. once this is done..you adjust your pilot screw jet needle out from lightly seated..back it out 2 1/2 to 3 turns, watch the groove on the screw head..count your turns out..just watch one end of the screw slot, once you do this..open and close the throttle..it should rise quickly..and drop back down in rpm's quickly..that is..if you got the settings right..this is what your shooting for.