I've got the YZ490 running pretty good. I really like the bike and the power, but I think I need to smooth it out a little bit. I need a some idea's on how to make it better for riding in the woods. What are the best mods for it? Carburetor, Pipe, Ports, Flywheel weight, Gearing? Any idea's, or experience's of turning up the old YZ490 would help.