You should not be attempting to tune yet if this is the first start the only thing you should turn at the moment
is the idle screw anti-clockwise to lower the idle speed after the first tank with the wheels off the ground you
must follow the break in procedure before setting hsn or lsn I have had one of these engines in my bullet for
3 years and it still runs perfect.The needle in the pic is the hsn the lsn is the one at the end of the
slide carb and the idle screw should be just below the lsn