gearing for my kdx 200

I am a little new to motor cycle mechanics. I have a question to ask about sporckets sizes, gear rations and speed versus torque output. The KDX 200 was equipted from the factory with a 14/47 gear. I would like to make mine a little faster about 60 to 65 M.P.H. at a comfortable R.P.M. range, as we are making it street legal. I am going off of my knowledge of bicycle gears as a starting point. On a bicycle if you use a bigger ring in the front and a smaller ring in the rear you get less torque and more top end and vice versa. Here in lies my problem. The gear set on a motor cycle is reversed. So does this then reverse the way the gears work. Smaller in front means more top end less torque or should it work the same. If I went to 15/48 would i get more top end or more torque. Please help, I really need it.

Thanks,

Jim Boston

thanks every body this has helped! i went with a 14/46. And stock or factory equipt was 13/47 so i went up 1 tooth up front and 1 out the rear. KAY DEE EXER i wish mine had titties it's got alot of balls but no titties!!!!!!!!!!!!!!!