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The fastest dirt bike in the world is an American made 2009 ATK INTINMIDATOR 700 or a 2010 KTM 300 two stroke. As four strokes have become popular in recent times, any 450cc bike can claim the title because there has never been a drag race with all current manufactures included with all variables the same ( rider weight , rider experience, etc ) ever done.

Would have to be either the KTM 950 Super Enduro or the BMW HP2 Enduro. Both put out over 100 hp.

Worlds fastest custom dirt bike. GSXR 1000 engine on off road suspention and tires. http://www.YouTube.com/watch?v=pS5FYrqaAls

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12y ago

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