Probably nothing to worry about. My '83 worried me a bit as it whines like a turbine as I go up through the gears, but as I've found out that is normal. Something to do with the internal drive chain I believe.
I think my bike'swhine is more internal than the belts because it buildsm upin frequency and doesn't respond to motor rpms. When I get to cruisin' speed I don't hear it at all.
Could be we're talking about two different sounds.
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