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Xr250 timing chain/ how to know if a XR400, CRF450, Ex400 chain works?

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We have a 1986 XR250 that needs a new cam and rockers. By the looks of the tensioner it needs a timing chain too. I have read various posts that soem folks use an XR400 chain, some use a CRF 450 chain, and even some EX 400 timing chains. Anyone know of a definative post that clarifies what works on what years, etc?

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