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Message: <blockquote data-quote="5twins" data-source="post: 706043" data-attributes="member: 156">The rear "guide" or "slipper" that the tensioner pushes into the chain to take up it's slack is usually OK. They rarely fail but can get badly worn if the chain is run too tight all the time. The front guide is the part that fails. It's an aluminum strip with a rubber layer bonded to it. The chain runs against it and it "guides" it so it runs straight. Now that they're so old, the rubber strip is coming unbonded and falling off. Then the chain runs against the guide's aluminum base, hence the aluminum bits you'll find in the oil.This is the front guide I replaced on my '78. The rubber hadn't fallen off yet but was pretty close to doing so. It was about 2/3 of the way unbonded .....<img src="https://i.imgur.com/w1FmGEX.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>