Author Topic: CB750A tranny klinking and klanking  (Read 93 times)

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Offline jukku

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CB750A tranny klinking and klanking
« on: September 19, 2019, 10:30:20 am »
Broken vibration damper springs on Honda CB750A Hondamatic.
Noice from the tranny when gear is engaged.

https://1drv.ms/v/s!AvgjL1lJG5iElNhh70pL3R76VM2Eew?e=QtLZQ7


Offline vik351

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Re: CB750A tranny klinking and klanking
« Reply #2 on: September 19, 2019, 09:30:08 pm »
didnt sound too good, be buggered if I woulda ran it that long with that noise...

How much of a fun job replacing those springs...???

Ya will replace them all at the same time I presume...???

I only get my bikes next week so then I can have a listen to them...  :'(

vik...goodluck...

Offline 05c50

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Re: CB750A tranny klinking and klanking
« Reply #3 on: September 20, 2019, 04:27:05 am »
Thanks for sharing the video and the repair. My A makes a similar noise, but is worse in neutral. It goes away in gear. Was a complets disassembly  necessary to replace the springs ?

.....Paul
Wear a helmet,the life you save may be your own.Ask me how I know.               CB650C,CB550F,GL1000,CB750A

Offline sammon287

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Re: CB750A tranny klinking and klanking
« Reply #4 on: September 20, 2019, 10:27:36 am »
Thanks for sharing the video and the repair. My A makes a similar noise, but is worse in neutral. It goes away in gear. Was a complets disassembly  necessary to replace the springs ?

.....Paul

Mine was similar to yours. I didn't know these springs breaking was a thing until I took everything apart and found them in pieces. Unfortunately, it does require a complete engine/transmission tear down to get to them. I'm replacing all plain bearings and seals. I'm reusing transmission ball bearings, the clutch disks, and the primary chain guides. One of the primary chain guides is very expensive and the other is unobtainable. They look OK, so I'm hoping they don't disintegrate after my long and expensive rebuild. I'm also hoping the replacement damper springs hold up better.
1976 CB750A

Offline raymond10078

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Re: CB750A tranny klinking and klanking
« Reply #5 on: September 20, 2019, 10:28:08 am »
Some noises are only the result of carbs not synced well and/or idle speed set too low.

Mine had exactly this issue, and no noise since.
1978 CB750A (upgrading very, very slowly)

Past bikes - Honda: SL350, CX650C, CB900C, CB1000C, CM450A; Kawasaki: several 1972 750 H2's; Suzuki: TC90J.

Bikes I want: CX650ED, a mid-sized japanese V-twin with ABS.

 

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Honda