I have a 97 kx 125....and i currently have stock sprockets front and rear.....i never ride on tracks only ride in the woods and up hill climbs......i was wondering what would be a good sprocket to give my bike more torque in the low end........i am running a pro circut pipe and silence....
Any help is Awesome, Thank you.

 

I don't know your bike, but generally, going down 1 tooth on the front sprocket makes a noticeable improvement, can usually be done with the stock chain, and is often less than $20.
check gearingcommander.com
It may not have your bike, but may have something similar. It can help you get a feel for gearing changes.