good to know. i think i'll still synch them to be sure. hard to tell b/c this is my first road bike and i've got nothing to compare it to or know anybody else who rides a 500T or 450 to ride mine and give me suggestions.
On the butt dyno, the biggest change you will see from sync-ing the carbs will be that your clutch noise will be less at idle. Your powerband may also be smoother if your carbs were really out of sync. It doesn't hurt to sync the carbs, but it is not a band aid fix for anything - if you have bigger problems sort them out first or your efforts will be for naught. SOme of the most common problems I hear people trying to fix with sync-ing the carbs are:
1) cam chain tensioner - this gets noiser if it is about to fail or out of adjustment. Sync-ing the carbs will reduce some of the engine noise but if your tensioner is on the way out nothing will keep it from going.
2) noisy clutch - air cooled hondas have a noisy clutch at idle, it is just how they are. Sync-ing the carbs cuts this noise a lot but it never really goes away. If the clutch is overly noisy you may want to check the botls holding the springs aren't backing out.
3) uneven powerband - if you are noticing the bike has hesitations in the powerband it is more likely a carb or intake problem. Same if you have surges. When synching the carbs if the carbs trade places in terms of the vacuum they draw as the rpms climb, then your problem is not the carbs being out of sync but more likely an air leak on one carb vs the other.
4) CV carbs - constant velocity carbs have slow throttle response. It is their nature. people think that sync-ing the carbs will improve their throttle response, and it will to some degree, but it won't work miracles. If you are wacking open the throttle and have time to contemplate the universe before your bike gets up and goes, you have other problems. Also if you are used to a cable bike and switch to a bike of equal power but uses CV carbs - that throttle lag is normal and sync-ing will not fix it.