to sync the carbs just take the air filter off. Look into the airbox and you'll see the slides. When you push the throttle ( engine off) you will see the slides raise. They should raise at the exact same time. If the do not, adjust the screw on one of the carbs. It's the screw on the big box that's on the carbs. Once you have them lifting exactly at the same time, they are synced. Now, if the idle is to high or low.. use the same screws and turn them the exact same amount... this is just to set the idle. If you turn them the same amount, the carbs stay synced.
Spoin covered the rest.