650" is a gross exaggeration, probably more like. This is the opposite of the discussion (new chain on worn sprocket) but it's the best I could come up with but it illustrates the problem of running mis-matched parts (old and new) together. I made this image from a pic showing what happens when an old stretched chain is run on a new sprocket. The chain climbs higher on the teeth, and creates its own cradle for the chain roller, at a slightly larger diameter. What this does is wear the sprocket out to be a. Consequently a #50 chain of 5/8" pitch (.625") becomes something like. 625" As a chain and sprocket set wears out, the metal does not stretch, the chain stretches by the fact that the pins and holes ovalize. #50 chain is 5/8" pitch (measured pin to pin). But if you're running new chains on old sprockets make a note of this. Hey 87mark7slc, there could be a misalignment and you are wise to check for that.
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