I've used joiners on quite a few bike cam shafts (mainly Hondas). Not had one fail. Which is not to say that there wouldn't be a first time. In theory, the joiner is just as strong as the link in longitudinal force (which is resisted by the plate itself. It may be weaker in sideways force, where the clip may be less strong than the riveted over pins. But one would think there would be very little sideways force at all on a cam chain ? Joiners were always used on primary chains which DID have strong sideways forces sometimes, because of the clutch action.(EDIT: and the shock absorber) Doubt that rpm figure has much to do with it.
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