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2001 WR426 HP rating

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OK, I was looking in some literature and it showed the WR426 HP rated at 47HP @ 9000 rpm. Does anyone know what the YZ426F had then. And if you do all the YZ mods, ie cam timing, grey wire, throttle stop, air box... etc, will this bring the WR specs to the YZ? Or does this sould like a HP rating after the mods?

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