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Author Topic: Clutch rattle.  (Read 3300 times)

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Nic

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Clutch rattle.
« on: February 03, 2015, 08:14:44 PM »
.
« Last Edit: February 27, 2015, 08:51:17 PM by Nic »
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Clutch rattle.
« Reply #1 on: February 03, 2015, 08:28:15 PM »
750??

Search for the Honda "Field Fix" on the site. It involves acquiring a double metal disc from a 75 -79 Goldwing just as they use on the 77/78 K and F and removing an existing disc. You add extra thickness. The 77/78 uses a wider basket and it can accomodate the extra double disc without removing that one disc. 
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline Retro Rocket

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Re: Clutch rattle.
« Reply #2 on: February 03, 2015, 09:33:19 PM »
Quote from: Nic on February 03, 2015, 09:22:05 PM
Yes it's a K2 750, so all I need is the double Goldwing plate? I have found the instructions for the field fix, just want to confirm that all I need is the double plate. Have you done it and how quiet is it? Thanks, Nic.

Put on a louder pipe Nic.... ;D ;)

{don't get abusive mate}.... :o ;)
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Clutch rattle.
« Reply #3 on: February 03, 2015, 10:48:01 PM »
Quote from: Nic on February 03, 2015, 09:22:05 PM
Yes it's a K2 750, so all I need is the double Goldwing plate? I have found the instructions for the field fix, just want to confirm that all I need is the double plate. Have you done it and how quiet is it? Thanks, Nic.

No, not yet. I installed a 78 K clutch basket in my 75 750(900)F. It has the double plate with the wider basket. What few miles I have put on it have been great. That and the undercut tranny. Smooth as silk and quiet. Oh yeah, it USED to rattle! The 75 F basket with a double plate are going into the 78 750(1000) engine I am beginning. The engine may be done soon but it'll be a while afterwards before the bike is built.

Sounds like you will be reporting before I do  ;)
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline PeWe

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Re: Clutch rattle.
« Reply #4 on: February 23, 2015, 12:39:17 AM »
I found the field fix description.  Remove one friction disk will not end up in slipping clutch?
EDIT: Found an entire thread with the mentioned document: http://forums.sohc4.net/index.php?topic=132482.msg1480628#msg1480628
« Last Edit: February 23, 2015, 12:46:02 AM by PeWe »
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline PeWe

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Re: Clutch rattle.
« Reply #5 on: February 23, 2015, 02:50:54 AM »
I noticed a slipping clutch on 5:th gear back in the 80's. (Probably due to wrong oil, car oil with anti friction stuff, Mobil 1)
Easy to reproduce under full acceleration from 4:th to 5:th.
I heard it, release throttle a little and full again almost sounded like shifting to "6:th" gear.
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Elan

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Re: Clutch rattle.
« Reply #6 on: February 23, 2015, 10:00:19 PM »
Subscribed with rattle when cold.
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Offline PeWe

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Re: Clutch rattle.
« Reply #7 on: February 24, 2015, 03:00:18 AM »
Have you checked this thread? Tower has some ideas here:
http://forums.sohc4.net/index.php?topic=42186.msg436496#msg436496
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline strynboen

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Re: Clutch rattle.
« Reply #8 on: February 24, 2015, 07:56:24 AM »
do a vaccum syncro..ot take s´´ all rattel...also chlutch rattel.it are vorst at cold engine.....on my 55o i removed the dubbel damperr plate..i vant full kontakt and it gives place for a ekstra set friktion/steel plate...it gives no more rattel vith no dæmper plate inn..as you have already learned/payed to find aut ;) :)my english are just exploding this days... ???
« Last Edit: February 24, 2015, 09:56:35 AM by strynboen »
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Clutch rattle.
« Reply #9 on: February 24, 2015, 09:52:37 AM »
Damn, I'm really understanding Stringbean these days!  ;) Yeah, sync yer carbs good.

How old/worn/thick are your discs? How much play with everything fitted together? What brand? Everyone seems to love Honda's.
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline BobbyR

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Re: Clutch rattle.
« Reply #10 on: February 24, 2015, 07:39:24 PM »
The clutch rattle comes with the bike, we all know that. You can synch the carbs and quiet it some. You can set your idle up to a point you lose engine braking.

I do all of those and go one step further. I ignore it.  ;D ;D ;D ;D ;D ;D ;D ;D
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Offline evanphi

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Re: Clutch rattle.
« Reply #11 on: February 25, 2015, 07:26:25 AM »
Quote from: Nic on February 24, 2015, 07:19:18 PM
Rightio then, only a few hours have passed and I have come up with something real simple and it works like a charm, you can even engage the lock while holding in the lever and pushing down on the lock  with your left index finger.
I'm happy to just go with this actually, no need for further development IMO. Will end up making a bush for the bolt so the ID of the hole in the lever doesn't get gouged out and would rather the jamming arm was made of Acetal or some similar hard wearing plastic so as not to gouge out the lever and switch assembly after some time but this'll do me. Pull in the lever and the jammer pops right up, beaudiful.
While the rest of you clowns are holding your crutches at the lights I'll be laughing :P

Experimental engineering (which I applaud) aside... this is incredibly unsafe! I've come to love my clutch rattle when it shows up. Rhonda is whispering sweet nothings to me...
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--Evan

1975 CB750K "Rhonda"
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She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
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Offline BobbyR

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Re: Clutch rattle.
« Reply #12 on: February 25, 2015, 05:53:17 PM »
I do applaud the thought and effort to find a solution. I have a K8 which allegedly Honda addressed the problem. With unsynched carbs  I will put my clutch rattle against anyone's.  ;D ;D ;D

It seems one of those things non one can get past. Locking my clutch lever seems a bit extreme.     
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Dedicated to Sgt. Howard Bruckner 1950 - 1969. KIA LONG KHANH.

But we were boys, and boys will be boys, and so they will. To us, everything was dangerous, but what of that? Had we not been made to live forever?

Offline Spanner 1

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Re: Clutch rattle.
« Reply #13 on: February 25, 2015, 07:54:27 PM »
I'd cry if someone took my clutch rattle away  :'(..... essential CB 750 sound, no matter what part of the world you hear one start up it's always there !
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Offline Retro Rocket

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Re: Clutch rattle.
« Reply #14 on: February 25, 2015, 11:03:51 PM »
Nic, what ever you do, don't do a dry clutch conversion.... ;D ;)
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750 K2 1000cc
750 F1 970cc
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If You can't fix it with a hammer, You've got an electrical problem.

Offline strynboen

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Re: Clutch rattle.
« Reply #15 on: February 26, 2015, 06:16:04 AM »
or get a dukati.           .i thourght my engine vas exploding. but,,.it vas a duc..holding behind me...they  rattel like krazy...
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Offline MCRider

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Re: Clutch rattle.
« Reply #16 on: February 26, 2015, 06:51:24 AM »
Quote from: Spanner 1 on February 25, 2015, 07:54:27 PM
I'd cry if someone took my clutch rattle away  :'(..... essential CB 750 sound, no matter what part of the world you hear one start up it's always there !

That's right! Part of the joy of ownership.

I've never heard positive feedback on any fix, from Honda or otherwise that was more than 50/50 effective.
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