Topic: noisy clutch basket on '78 CB750F SuperSport

[cvs750]

Hey all two wheel enthusiasts,,,, I have a 1978 CB750F model that has a rather loud clutch basket with bike in neutral and clutch disengaged. Once i pull in on the clutch lever it smooths out and is quiet. Lately i've noticed that i have more vibration above 60 MPH and a sort of howling noise when i first take her out for a run. I've adjusted the clutch 3 times and it's smooth and does not slip at all. Overall the bike is a very strong runner. Anyone else encountered this type of noisy basket and is there reason to be concerned about this. Thanks and ride safe 

[Lumbee]

...sup CVS...I have a 78F also...great running bike...I agree!!!  The clutch side on mine rattles too.  I was told it was nothing to worry about...just loose clutch rings.  As of yet I have not taken an afternoon to pull the clutch side apart and see how things look inside.  I think you can replace those rings, and that my help...I also herad honda put out a bulliten on the problem, so its well known...

[TwoTired]

I have a Honda bulletin in JPEG form that I got from a web site in past years.  It's a 532 K JPEG, so I can't post it here.  It's dated December 8, 1976.  Tittled CB750 Clutch noise Update.  It also says the factory fix was put on engines with numbers higher than :
CB750F E #2557523
CB750 E 2700014

Nice pictures with assembly order and all the part numbers and such.

Seems like it should be in FAQ somewhere but I don't know how to do that.

Where should I send it?

[kghost]

It was on the old Greenspun, Believe its on this one too somewhere.

[bryanj]

As i remember it that mod uses a goldwing steel riveted plate but thats been discontinued unfortunately.

[MRieck]

Bryan   I was able to order that part about a month ago.

[kghost]

Gold wing Plate still available at my Dealer. Wanted like $60 new.

Also in the later model bikes. My 77 CB750 Supersport had one.

You might just watch E-Bay for a Goldwing or late model clutch pac. They usually go cheap in the $20 range.

[MRieck]

...sup CVS...I have a 78F also...great running bike...I agree!!!  The clutch side on mine rattles too.  I was told it was nothing to worry about...just loose clutch rings.  As of yet I have not taken an afternoon to pull the clutch side apart and see how things look inside.  I think you can replace those rings, and that my help...I also herad honda put out a bulliten on the problem, so its well known...

What are you talking about when you say clutch rings- not sure I follow.

[Lumbee]

...numbers 4-7...

[Jonesy]

Here's the tech bulletin mentioned in the thread:

http://sohc4.us/files/clutch_rattle.jpg

My 750 does the same thing. As long as I hold the clutch in, she's nice and quiet. Let it out in neutral and she becomes a rattle trap. (I almost can put the Ducati's to shame!)

[kghost]

You could just buy a $1.00 sticker from Barnett. Stick it on the side and everyone will think its normal for your "firebreathing" Machine.

[bryanj]

That bulletin is the same one i have, last time i tried to get that plate here in UK (about 2 years ago) it came up discontinued on my dealers price list but didnt go into it any deaper as it was for a paying job and the man expected it cheep.