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Author Topic: Primary drive rubbers  (Read 1576 times)

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Offline yesteryear

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Primary drive rubbers
« on: March 30, 2013, 06:05:29 AM »
Hi Guys,
For years been ignorant to this but while surfing various sites this does seem to be a problem.Two questions for all the experts
1.Does this really happen and the symptoms are what?
2.Why are the part numbers different for the k6 and if you can get this the price doubles almost?
I thought they were all the same even though they are both discontinued now see  http://www.eBay.de/itm/Primarruckdampfer-Honda-CB-750-Four-Motor-Getriebe-CB-500-550-Four-/221206209764?pt=Motorrad_Kraftradteile&hash=item3380eae4e4.
Sorry if this has been discussed before.
Cheers
Yesteryear
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Offline yesteryear

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Re: Primary drive rubbers
« Reply #1 on: March 30, 2013, 12:13:36 PM »
Hi Guys,
Come on bit quiet on this one what with loads of 750s still in the states I thought I would get tons of advice on what you have found etc. Maybe hondaman will come to my rescue?
Cheers
Yesteryear
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Offline Retro Rocket

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Re: Primary drive rubbers
« Reply #2 on: March 30, 2013, 02:37:07 PM »
OK, i'll bite, does what really happen...?  You mentioned the primary rubbers but thats it...?
Can you buy new ones ?  are yours stuffed ?   No mind readers here as far as i know.... ;D
« Last Edit: March 30, 2013, 04:20:19 PM by Retro Rocket »
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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Primary drive rubbers
« Reply #3 on: March 30, 2013, 03:55:06 PM »
There has not been much chatter on this site about using those. My thoughts are that the majority of us reuse what we have.

We'll be looking forward to your report after you install. Price seems resonable and it comes as a kit. Why not?!
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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: Primary drive rubbers
« Reply #4 on: March 30, 2013, 04:21:16 PM »
I am going to use the heavy duty ones for my 1000cc engine...  M3 racing sells them...
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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline bwaller

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Re: Primary drive rubbers
« Reply #5 on: March 30, 2013, 04:27:11 PM »
This is interesting because although I have seen these available for 750's I've never seen them for the 500. Any of my really close European friends care to help me with an e-bay transaction?  ;D
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bollingball

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Re: Primary drive rubbers
« Reply #6 on: March 30, 2013, 04:54:03 PM »
OK I'M not sure are we talking cush drive here? They sure are different than my K8??
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Offline Retro Rocket

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Re: Primary drive rubbers
« Reply #7 on: March 30, 2013, 04:58:02 PM »
Quote from: bollingball on March 30, 2013, 04:54:03 PM
OK I'M not sure are we talking cush drive here? They sure are different than my K8??

Not rear cush drive rubbers, primary cush drive, what the primary chains run off inside the engine.... ;)
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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline bryanj

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Re: Primary drive rubbers
« Reply #8 on: March 31, 2013, 01:47:37 AM »
BWALLER as long as you are talking engine primary cush drive Dave Silver did have stock
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

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Offline bwaller

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Re: Primary drive rubbers
« Reply #9 on: March 31, 2013, 03:26:44 AM »
Thanks Bryan, I've just changed those, but the e-bay ad is for the clutch hub dampers which I've never seen offered. I took one apart that was loose & the damper rubbers are hard as a rock & cracked. The hub itself is perfect otherwise.
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Offline MRieck

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Re: Primary drive rubbers
« Reply #10 on: March 31, 2013, 05:40:33 PM »
The German SOHC club has them for the 750 but will not sell to anybody outside of their group. At least that is the way it was.
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Offline bryanj

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Re: Primary drive rubbers
« Reply #11 on: March 31, 2013, 11:29:20 PM »
bwaller, never even considered taking one apart, might be worth comparing to the 750 ones if you can one of each in biyts in the same place at the same time
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline Retro Rocket

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Re: Primary drive rubbers
« Reply #12 on: April 01, 2013, 02:15:21 AM »
Quote from: MRieck on March 31, 2013, 05:40:33 PM
The German SOHC club has them for the 750 but will not sell to anybody outside of their group. At least that is the way it was.

Sounds like we will have to infiltrate their fold.... 8)
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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline bwaller

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Re: Primary drive rubbers
« Reply #13 on: April 01, 2013, 04:28:25 AM »
Hope you don't mind straying off topic for a bit yesteryear.

Bryan the late model hub in my race engine became quite loose on the rivots, but the hub itself was worth saving so I took it apart thinking I might rebuild with parts from an older tighter hub. I sent this German man an e-mail asking if I could buy a set of rubbers.

Turboguzzi has suggested welding the plate to the primary gear then re-rivoting. For sure this eliminates one problem but will undoubtedly create another. I'm certain without damping of the hub the plates/discs will notch the aluminum hub/hub center very quickly. Plus all the stress is on the rivots, keeping them tight might be difficult.

Welding is an option, I'll see if this guy responds. Any other ideas...I'm all ears.

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Offline bryanj

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Re: Primary drive rubbers
« Reply #14 on: April 01, 2013, 11:16:17 PM »
M3 used to do a lot of stuff for the 750 racing but also did a bit with the 500 so it might be worth asking them
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline lucky

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Re: Primary drive rubbers
« Reply #15 on: April 02, 2013, 07:33:38 AM »
I bought a new set for my 1978 CB750 from Bike Bandit.
The old ones were ruined from the heat from the brake drum getting hot.
They were shrunken from the heat too.
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Primary drive rubbers
« Reply #16 on: April 02, 2013, 11:27:30 AM »
Funny?? I went to Bike Bandit to buy a set Lucky and they don't list the separate components of the primary drive sprocket?? You had my hopes up. Are you thinking of the rear drive cush rubbers?
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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: Primary drive rubbers
« Reply #17 on: April 02, 2013, 02:28:47 PM »
Primary drive rubbers...



Now i hope everyone is on the same page....
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750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.
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