Topic: 1975 CB750 Clutch Noise

[John G]

HAVING NEVER OWNED ONE OF THESE BEAUTIES I DID NOT REALIZE THE CLUTH NOISE IS NORMAL. APPEARENTLY THERE IS A FIX. YOU PUT A GOLDWING CLUTCH PLATE IN TO TAKE UP SOME ROOM. DOES ANYONE KNOW THE PROCEEDURE, PART NUMBER AND DESCRIPTION OF WHAT I NEED TO REMIDY THIS?

[BenelliSEI]

Before you tear into it, the noise is a combination of cam chain, primary drive chain and clutch chatter. All magnified by a dry sump (very little oil in the sump to deaden the noise). Give it a good tuneup and synchronize the carbs. Don’t set the idle too low and 75% of the noise will disappear.

[John G]

Thanks you Benelli. Sounds like a good place to start.

[rotortiller]

Give it a good tuneup and synchronize the carbs. Don’t set the idle too low and 75% of the noise will disappear.

Nicely stated.

[John G]

Does anyone know about this Goldwing friction disk business?

[madmtnmotors]

Same as the double steel plate used in the K7/K8/F2/F3 models. Careful attention to detail is required when performing this mod. I think there may have been a TSB from Honda for this. As Benelli indicated, a good carb sync will often quell most of the noise and bless you with a super smooth idle too.

[Jerry Rxman Griffin aka MuthaF'er]

Basically remove 1 fiber plate and install the double metal plate in the middle. I can text you the Honda bulletin but you gotta reach out before Tuesday night as I'm outta here.

It is not a friction disc business.

You can also swap out a 77/78 clutch unit but you need more 77/78 parts such as the clutch cover (not the chrome piece), deeper clutch basket and clutch guts

All this info is buried somewhere on the site but good luck finding it

[Don R]

http://forums.sohc4.net/index.php/topic,189778.0.html

 75 and up used a clutch basket with the outer plate having wider tabs, if a standard inner plate is used it may rattle.

[Don R]

 I just saw that clutch service bulletin here somewhere and printed it for my collection of interesting things to know.
  Edit; Scroll down to "750 clutch question" on this page for the bulletin and more clutch info you might not need.

[newday777]

This is the Honda service bulletin to fix clutch noise.
The list of part numbers needed(all 5 parts have to be changed out)is at the bottom of the bulletin.

[John G]

Thanks 777 and Mutha F*****. This may be something required.

[PeWe]

I did some measurements when doing my K2 clutch today.

Old stock clutch package height was 36.7mm. Used fibers and metals.

I removed 1 fiber only. Added the double metal disc. Clutch package height 36.0mm New fibers.
All metals glass beaded just for sure.

7 fiber, 6 metal disc where 1 is double. This package need the later clutch basket and inner.




I did the one fiber off, double disc added. Clutch pack 36.0 mm. 0.7mm thinner than my old.

It still rattle. I need to ride around for a while.

It might be better if the package could be 37mm something