Final drive ratios:
Take your current rear belt teeth count and dived it by your front belt teeth count and that will give your final drive ratio.
Now find a set of sprockets when divided to one another equals your current ratio and that's your starting point.
If you want quicker acceleration (but will slow your top speed), go to a bigger final drive ratio. (using what you have as a starting point, either go bigger in rear teeth count, or go smaller in front teeth count).
If you want more top speed (but slower acceleration) go smaller in teeth count in the rear, or larger teeth count in the front.
For top speed, use the engines redline, divide that by the final drive, now use the drive wheel's circumference to determine top speed.
Theirs all the info you need, now let’s see what you do with it!
~Mike......