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Honda MX & Off-Road Dirt Bikes
2002+ CR250 Cranks Heavy?
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[QUOTE="skipn8r, post: 1015200, member: 52414"] I''ve ridden my CR back to back with my friends '05 YZ250. Where the stock CR seems lacking is in the responsiveness down low. As said above, when the CR comes on, it is at least as strong as the YZ and seems to be stronger. Now that I have my Boyesen ported cylinder, my CR is silly fast compared to the YZ. But the YZ still seems more responsive down low. The original observer of the weight difference said that an older (lighter) crank will bolt into the later engines. He went on to say that the heavier cranks are better for oval tracks and the lighter crank is better for MX; hence, he has presumably observed a performance difference. BTW, if the bearings are the same, and the cranks interchange and one is lighter; it is reasonable to presume [I]a priori[/I] that the lighter crank may have a lower MoI. That being said, I'm not claiming that a lighter crank will solve the observed low RPM CR "problem". I am saying that given two otherwise equivalent engines, the one with the lower MoI will feel (and will be) more responsive to the throttle. It's at least worth a try.... [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
2002+ CR250 Cranks Heavy?
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