Balance your props first! Then put your plane together, turn the needle in (clockwise) until it seats (gently). Now back it out 3 turns and start your engine at a fast idle. Let it warm up for a minute then advance the throttle slowly to full. Please have your plane secured for safety reasons. Adjust your needle in or out to obtain peak rpm, the back out the needle slowly until you have a drop of about 1500rpm. The engine should then be run for about ten minutes then a 15 minute cool down time then repeat the above steps. Do this 4 to 6 times. When this is done, set your needles by adjusting the high end first, obtain peak rpm then richen it up until you have about a 200 to 400 rpm drop from peak (about 2 to 4 clicks). For the low end, at idle pinch and hold the fuel line. If the engine revs up 100 to 200 rpm then your good. Otherwise adjust the low end accordingly. Remember counterclockwise = richer, clockwise = leaner. The exception is for the low end on "Air Bleed" carbs which you don't have. Air bleed low end adjustments are opposite. This is an ABC engine, make sure you use a fuel that has some castor oil in it.