It is just when the throttles are even the rpm's are 100-200 off between engines. If I advance the starboard throttle 1/2 in or so they tachs show the engines sync'd. I really can't tell any differnce between the sound with such a small change in rpms. If it ain't gonna hurt anything then I'm not gonna worry about it at all. I just wondered if the torque could create any problems with the engines turning different speeds. Then again the tachs may be off anyway. I am going to get them checked and see if they are off or the throttle linkage needs adjusting.