.. the quality of the materials and their longevity is much greater than it was then. With that in mind, you rely on the manufacturer and their literature to give some sort of guidance and direction but I've used three sources of information; handbook, dealer and manufacturer and they've all come up with a different figure.
This is because a cambelt, especially one that looks as robust as the one I've seen in images of this engine, will last its life if made of the latest strong materials and nothing it drives seizes. They are so strong nowadays that only slightly larger ones are used to drive powerful motorbikes, not merely one or two small camshafts and possibly a small water impeller. I am surprised they have not yet replaced messy bicycle chains, but I suppose the old internal gears are more expensive than just jumping up and down cogwheels.
The recommendations are estimated risk assessments of the odds of things failing within that time/distance. It will only break if one of the things it drives seizes - and even then should give plenty of warning (noises and smells) as the water pump is driven by the flat side. The risk is having it cack-handedly replaced with an inferior item (belts are variable in quality) with a premature failure soon afterwards.
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