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Author Topic: vibration goes away when you pull in the clutch?  (Read 880 times)

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Offline mario medeiros

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vibration goes away when you pull in the clutch?
« on: November 08, 2009, 04:17:05 PM »
Help,found my bike(cb750k 78) has a vibration mostly at lower speeds and when you pull in the clutch lever it will go away.Any ideas?Thanks
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Offline Terry in Australia

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Re: vibration goes away when you pull in the clutch?
« Reply #1 on: November 08, 2009, 04:40:04 PM »
Try synching your carbs mate, "out of balance" carbs are a common cause for rough running and vibration. Cheers, Terry. ;D
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Offline mario medeiros

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Re: vibration goes away when you pull in the clutch?
« Reply #2 on: November 08, 2009, 05:46:51 PM »
Will try,but it does run well and it just started the vibration today.It feels like it is coming from the motor area and pulling in the clutch makes the vibration smooth out.
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Offline mario medeiros

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Re: vibration goes away when you pull in the clutch?
« Reply #3 on: November 10, 2009, 04:57:10 AM »
Clutch springs?maybe?
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Offline Inigo Montoya

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Re: vibration goes away when you pull in the clutch?
« Reply #4 on: November 10, 2009, 06:18:47 AM »
Easy way to check. Listen for the motor noise, now pull in the clutch, does it go mostly away? It will kinda sound like a bucket of rocks.
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Offline eurban

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Re: vibration goes away when you pull in the clutch?
« Reply #5 on: November 10, 2009, 06:27:40 AM »
The noises you describe are typical of the SOHC engines, particularly the 750s.  A combination of clutch plate rattle and primary chain slap.  As Terry mentions, synchronizing the carbs will help to reduce the noise.  Search the forums and you will see that this question is asked frequently.
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Offline mario medeiros

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Re: vibration goes away when you pull in the clutch?
« Reply #6 on: November 10, 2009, 07:09:38 AM »
How do you check your primary chain(didn't know this bike had one)Thanks
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Offline wrenchmuch

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Re: vibration goes away when you pull in the clutch?
« Reply #7 on: November 10, 2009, 08:48:56 AM »
Yoy need to pull the oil pan to check your primary chains . You would measure from the pan gasket surface to the primary tensioner bracket . Should be 70 mm or less . Page 53 of the honda manual . My clutch makes noise when I need to tune up my bike . Maybe something whet out of adjustment .
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