There are too many variables. Horse power, track conditions, rider weight. ect.
Don't know exact HP. Have a Monster intake with Monster Duals and the PC3. +2 JD MGC LT a-arms with Motowoz front and rear. Dirt riding is usually dry hardpack but some rainy stuff. Sand is can be dry powdery or damp and tacky. With gear on I'm about 230. Rode with the stock 14T and seemed like 1st was useless. Started mostly in second and rode in third/fourth. Hill climbing, not racing, I ran in second or third. Second tended to be a little short. Looking for all around running. Don't need to be the fastest or quickest. Just want safe, comfortable running with whatever I choose to do. As for the front sprockets, the stock one came right off, but the Moose 15T I put on to try was a little tight going on the splines, is that normal? May need a small puller to pop it off if needed. Guess tight is better than loose. Thanks for all of the tips.