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My cousin has a yz250 and another cousin a yfz450 and the dirtbike will run away from him
in 100 yards putting about 10-12 bike lengths between them.
Tell your friend the only way the yz won't stand a chance is if he gets the 450 version.
maybe 10 mph I've got an 01 that I got up to 83 mph according to my gps before I let off. I dont like leaving 2 strokes wide open for extended periods.