2007 yz450's have around 49-50hp. All engines are different. If you want a hard hitting motor the 2003 yz450 is where you wnat to go. A 2003 model pumps out 49-53 stock. The motors have a high performance cam in them and they hit hard. They will destroy a newer 450 in a drag race anyday. I have all facts from motorcycle usa.com
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