i have a 04 yz 450f . i was thinking on replacing the sprockets and chain. what brand would you all recomend ? what gearing? mx tracks some tight corners not many but a few,where can i get a good price on it? just some thoughts haven't got a flywheel weight yet but that is on the list probably dr. d 6or 8 oz from what i been reading. thanks for the input and suggestions.