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If the chain stays on both sprockets, then I don't se why letting it go loose makes any difference to the cam timing as the two chain wheels will always return to the same plate with respect to each other when the chain is tightened again with the tensioner. As for the chain jumping a tooth, I don't believe that this is possible inside the crankcases as there is not enough clearance around the edge of the chain wheels on the intermediate shaft to allow this to happen. Also, having just reassembled my engine ad done the cam timing (last week) these chains do not just jump a tooth. It is hard enough to get them on to the chainwheels to begin with!
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