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Thanks for the advice chaps, I agree that in a perfect world replacing sprockets and chain together would be best. But in my case the chain wear was at around 1 percent, or under 3/8ths over a 36 inch piece of chain. Maximum wear before a chain is total scrap was traditionaly 2 percent or say 6mm in 300, or 1/4 inch per foot. Nearly all the wear had taken place on the solid pins. Not all of them but most, which had given rise to tight spots, or should that be loose spots? The rollers were all still cylindrical and showed no external wear and were well lubricated but the chain really had had it because of the grease loss from the sealed pins and wear would be very rapid from now on.
The sprockets appeared to be in very good condition, certainly no visible change in profile between the driven side and the trailing side of the teeth. So, I will take a chance on them for the next two or three years. A final thought is that maybe not all pattern replacement sprockets are of oem quality anyway so I would have had to spend even more cash to buy the very best and how about a new carrier and cush drive rubbers and so on until all my cash is gone. Time will tell!
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