if you want to get a better power ration on our machines and not caring if top speed drops some , you can reduce the diameter and no. of teeth on the drive sprocket . is there anyone with experience that have a idea if going from say a 20 tooth sprocket to a 18 tooth will be a noticeable difference or does one need to buy 3 or 4 different sets of sprockets and just test each size. in other words will just a couple of teeth change things much or ? thanks , johnboy va.