GL1000 engine - high pitch noise

[zilberas]

Hi, I have a 77 GL1000 (21k miles on tach). Love the bike, it runs perfectly. But I hate the high pitch noise in the engine. It gets really noticeble when deccelerating.

I believe it is sort of expected and is due to engineering decitions to counter-balance/smothen the engine (something is rotating twice the revs of a crankshaft)

But I feel it is getting worse and worse. So I started to think maybe something is worned out already. Maybe some bearings.

Any know mods on how to minimise this hight pitch noise?

Thank you for your knowledge and expertise!

[Rambozo]

You might take a look at the starter clutch and the timing belt idler pulleys. This is one of Honda's quietest engines, so I suspect you have a problem.

[zilberas]

Yeah, I don’t know how the bike should sound brand new. I even never heard another one in real life for comparison.
But from the videos I find on the internet - I hear everyone has it. And it’s very annoying to me. A sound of something spinning, like the ventilator. Or maybe it’s clutch. But it’s very unpleasant.
Wheeew wheeew

Some examples:


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[Rambozo]

That is typical timing belt noise. Getting the tension set just right can help a lot but it will always be there with a belt drive.
Honda doesn't spec the tension like Porsche does, but Porsche does have a great tension gauge that with some trial and error I'm sure the Honda can be set a lot quieter. The right tension makes a huge difference on Porsches and without the gauge you just can't get it right.