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The Vintage Japanese Motorcycle Owners Group: Discussion Forums

Vintage Japanese Motorcycle Owners Group :: View topic - Honda cb 750 noisy gearbox


Honda cb 750 noisy gearbox

 
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jdj2
Welcome New Member
Welcome New Member


Joined: Jun 27, 2017
Posts: 3

PostPosted: Tue Aug 01, 2017 3:02 pm    Post subject: Honda cb 750 noisy gearbox Reply with quote

Hi guys new to the Honda cb 750 bike starts no problem but there is a noise from the gearbox, sounds as though the gearbox is not meshing, have checked the gearbox linkage this seems fine, there is a clunking noise from the gearbox, but as soon as I pull the clutch in the noise goes ???? please help
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kbts250m
Weekend Warrior
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Joined: Jul 20, 2017
Posts: 64

PostPosted: Sat Aug 12, 2017 11:41 am    Post subject: Reply with quote

Without know any info about your model number or having a lot of hands-on experience it's difficult to give you any meaningful advise except I would not ride it or even run the engine until you sort this out. My first thought would be to pull the clutch cover. If you are lucky it could be one of the clutch spring bolts or the main clutch nut is coming loose. You can see exploded views of the parts on Partzilla. Just enter your model number.
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Currently - 75 Suz TS250, 02 Kaw ZX-6R

Previously - 70 Suz T350, 71 Suz TS250, 72 Suz GT380, 72 Suz TS125, 72 Suz TS250, 75 Yam YZ360B, 72 Suz GT380 diy cafe racer, 80 Suz GS750, 73 Suz TS185, 82 Suz GS1100
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05c50
Full Throttle
Full Throttle


Joined: Oct 26, 2007
Posts: 2948
Location: Greensburg Pa

PostPosted: Sat Aug 12, 2017 2:33 pm    Post subject: Reply with quote

Two things come to mind-clutch rattle and carb sync. Since the noise changes when the clutch is pulled in, google "cb750 clutch rattle". You'll find a lot of info about it.

..........Paul

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�77 CB550f
�77 CB750a
�78 GL1000
�80 CB650c
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�79 KZ200
68 CB450K1-taking up all my time
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