Big-end wear is surprisingly difficult to identify. Mine appeared to be fine, no play to be detected untill I flushed it with petrol and, only when still wet with petrol, a discernable ''click'' was there. According to Phil Irving and others a clearance of 0.002" to 0.003" is acceptable.
Off course the only way to find out is to dismantle the crank assembly; anyone who would like to try himself should try this link.
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