What is the proper operation for starting / warming up / running using the advance timing knob on my 25 hp 2005 Mercury OB (2 stroke). The knob that I always thought was the choke actually advances the timing when pulled out once (and can be advanced further by turning clockwise) and primes the carb when pulled out a second postion. Should the knob be used to advance the timing while in full throttle? Could this have anything to do with the reason I stall when putting in gear? I just rebuilt the carberator and it still stalls.