dynamo chain?
I am going to interperate this to be a motorcycle alternator reference.
Honda motorcycle engines I am familiar with (USA market) have the alternator attached directly to the crank shaft, and do not drive anything else.
There may be a overhead cam chain in your engine and I can tell you they will make noise, particularly as they age. You claim your motorcycle is more than 20 years old. It probably shows some wear and it can probably be adjusted.
Please visit the Honda site at
http://hrca.honda.com/ At this site, they offer free access to generic engine manuals. If you pay the few $ to join, you can get your manual free to download according to information posted at the site.
I hope this helps you resolve your question
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