i'm taking my bike in for service...
and while the tank is off...i'm going to check valve clearance and carb sync too...
should i do a rejet too?...or is that a totally different thing?

if i do a air fiter change later on...do i need to sync the carbs again?

If you're bike is Canadian, it already has the #40 pilot jets that us statesiders replace to get faster warmups and improved low-end throttle response.  If it's a stock US bike, you'll probably want to replace the pilot jets resync the carbs.  The sync adjustment affects the bike most at idle and decreases as the throttle is opened.  If you're changing main jets, the synchronization is unaffected.  Likewise if you're changing air filters since it affects both carbs equally.  Even if you're switching to individual pod filters, the difference in flow rates at idle is insignificant.  

ok...so that means i dont' have to re-jet since it's a canadian bike right?
and that carb syncs will be good with whatever mods i do in the future right?

why do i need to do a carb sync anyways?...

Quote from: Frosti'm taking my bike in for service...
and while the tank is off...i'm going to check valve clearance and carb sync too...
should i do a rejet too?...or is that a totally different thing?

if i do a air fiter change later on...do i need to sync the carbs again?

Rejet to improve performance.  Carb sync to bring bike into spec.  Kinda like   upgrading the exhaust system on you car vs. doing a wheel alignment.

Simply changing the air filter shouldn't affect carb balance.  If your adding a higher flow air filter, then you should theoretically rejet to optimize performance.  But if that's all your doing, bike will probalby still run okay w/ out jetting... but then, what's the point of the hi-flow filter if you don't give it more fuel too...?

OK that 40 pilots... dont take it too seriously... 03's are different than 89-00...
Cool.
Srinath.