Turn both jet screws CW to stops (lightly), then back out each CCW 1-1/2 turns. This is a basic setting that will allow the engine to start and run. Let the engine warm up, then pull the throttle full on--turn H screw CW until the engine speeds up somewhat. Proper adjustment is when the engine is 4-stroking unloaded, but immediately 2-strokes when cutting. Release the throttle and adjust L CW until the engine idles fairly well, but allows the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!