sprocket help.
 

so, how do i know if i need sprockets and which, frt or rear ?

if they are being replaced because either one of them is worn, it's best to replace both of the sprockets & the chain at the same time..............

Pull the chain tight on the back of the rear sprocket. If you can see more than half a tooth its time for replacement. As willie said its best to replace them as a set. If the countershaft sprocket looks good you can usually get away with just the rear and a chain but not recommended. Good luck.

You would have to take the cover off to look at the front one but if the teeth look like little waves, broken or are rounded they need to be replaced. What kind of mileage do you have and have you been cleaning and lubing the chain? Mine had a little over 15,000 when I changed it and could've lasted longer but I went for a gearing and size change so I changed every thing.

Look for teeth that are curved, like shark's teeth. That's the first sign of wear. +1 on everything else that's been said so far.

This is something that non-mechanics always have a problem identifying. The Honda manual has a graphic on page 3-17. Almost every motorcycle shop manual has pics or drawings to help you identify worn sprockets.