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Author Topic: Whirring sound in neutral?  (Read 922 times)

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Offline stevenmac

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Whirring sound in neutral?
« on: October 05, 2015, 12:07:57 PM »
Heya,

CB750K3: bike runs fine. But last night heading home I noticed this whirring sound at a red light. Shifted into gear and it went away. Once I was home I went back and forth: the sound only happens in neutral, and it's not the regular "clutch rattle," more of a whir or whine coming from the front. Any ideas? I'll try to get a video. Thanks.
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1973 CB750

Offline Don R

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Re: Whirring sound in neutral?
« Reply #1 on: October 05, 2015, 12:21:45 PM »
 Timing chain? valve lash? My K0 has a big cam with .004 lash it whirrs a bit, any changes?  Sometimes after getting a quieter muffler you can hear things you didn't notice before.
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