The only way to tell is to pull it apart fully, and let's face it, whether a crank has done 3000 race km or 46000 road km, it's likely to need looking at in one way or another. If it fails, it's going to be expensive, and your options are [approx] £500~600 for a rebuild, £xxx on an unknown used item, or close to £1200 for a new one from Honda. Any used crank, in my opinion, should be pulled apart, measured, and have at least the mains done, because you will never know it's true history unless you bought it new. We've seen people got through several second-hand cranks in a season before. A complete false economy.

£25 to pull one apart and have it mic'd is a bargain, even if I do say so myself! If it were costed by time, it would be many times that amount, and can still potentially save you thousands if you have a very bad failure.

NSRs are at an age now where cranks are becoming a definite issue. MC16 and MC18 cranks are no longer available new from Honda, and I am reliably informed that there are only a small number of MC21/28 cranks left worldwide on the Honda system.
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Andy.
NSR-WORLD.COM

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