I adjusted both my engine separately, then figure out which one is stronger. I also use the twin sync. I think the engines sound better synced up. The twin sync monitors the rpm of both engines then takes the higher rpm and slows it down and take the lower rpm and brings it up. I just make sure the lower rpm is set rich so that when its rpm is bought up it doesn't go lean. Also if you lose and engine with the twin sycn it automatically brings the running engine to the idle point that you set. to get the power back just bring the throttle stick to idle and when you advance it again you get control of that engine again. This saved me when one of my engines ran out of gas. No adverse yaw and I was able to safely get it back on deck. I run it on 2 o.s. 70 4 strokes on a hangar 9 twin otter. but I do agree with every one else to get the engine adjusted one at a time and dont rely on the twinsync to do it. The engine should run good without it and if it does not I dont fly it.