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Honda MX & Off-Road Dirt Bikes
2002+ CR250 Cranks Heavy?
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[QUOTE="skipn8r, post: 1015130, member: 52414"] I agree that the moment is the relevant piece of information. However, the very close physical similarity (they both use the same crank bearings - 91008-KAE-731) between the cranks coupled with the observations of a heavier crank in '02 coinciding with a perception of slow revving (classic symptom of increased moment) bears further examination. I'm not aware of any published info on Honda crank moment numbers and an accurate calculation seems difficult (??). I'd be willing to experiment with a lighter crank when it's time for the next top end... The idea that the '02 and up engines have a higher moment of inertia would also explain the dyno results that MXA declared in a few CR250 comparison tests; they say it dynos great, but is very unresponsive at low RPM when ridden. The moment of the dyno is the dominant factor in a DynoJet arrangement, so the CR dyno figures would look similar to other bikes in the test (especially in a high transmission gear), but it would feel more sluggish when ridden (especially in the lower gears). The added moment doesn't have to be associated with the crank, but when someone posted the weight difference cranks, it seemed mighty coincidental. [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
2002+ CR250 Cranks Heavy?
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