I do a lot of trail riding and i was wondering if the stock sprocket setup is the best setup

 

The Stock set up is a fine combo and will take on just about everything. Do you go hard and fast on the trails or are ya more of a "take your time and see the sights" kind of rider ?

It all depends on you and what the trails are like. If I were riding in rocky beds I would probably gear down so i could rock crawl a little better, Try a 15 tooth for that.
If you run sand washes and long bending trails try a 17 tooth. These are just a few recomendations.

 

If you trailride and have the stock 20" rears try a 15 tooth front sprocket, more bottom end. If you have 22" rears go with a 14 tooth front. Thats what I run. Just snap the throttle and bring the front end up to go over logs, ditches and other obstacles. Good power for hills too.

 

I am running 22'' rear and i ride hard and fast in prity rough rocky ''Baja'' terrain

 

Get both the 14 and 15 tooth sprockets. They're not very expensive and they're easy to change. Then you could change gearing at any time.