I have an 1982 it465, I'm looking for more power / harder hit as in YZ 465. This bikes runs good, starts 3rd kick. I replaced the stock plastic with DC plastic (81 YZ) . The seat and tank are off a 82 YZ490. DG pipe and silencer. What mods should I do to this bike ? Or should I sell and look for a YZ465 ? If sold what would it be worth ? Thanks, Jay