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2011 Yamaha YZ450F First Ride Picture 10 of 21

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Photo 10 of 21
Everything else is the same for 2011, so the four-valve, dual overhead cam engine has the same 97 x 60.8mm internal bore and stroke.

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Caleb Murdock - Awesomeness  November 2, 2010 09:50 AM
Awesome dude I have the same type of dirt bike it is the bomb!!!