01-12-11, 09:10 PM
I have no experience at all of your high mileages, but from an engineers view, first of all are the sprockets in line? Are the teeth showing signs of wear, you must by now be familiar with what to look for there? So if the chain is running in line (the sides of the sprockets look OK?), and you don't have a lubrication problem, there again you should know with your previous experience, you can only have a naff chain.