Topic: How many of you actually replace the primary drive cush rubbers?

[PeWe]

More yes than no?? Are we sure that it's not interpreted as the cushes in the rear wheel vs the ones inside the engine? Not like this is easy nor are the parts readily available or really commonplace. However it is GREAT in theory! I am one of the no's.

if you go back through you may notice that all of the "yes" guys are all 500/550 guys (except PeWe)  I am thinking something about the 500/550 is different enough to make this practical...And PeWe seems to enjoy tearing his bike down to the core several times a year, judging by his posts.

Ha-ha-ha! This is only 2:nd time I pull engine and take it appart completely since early 1985 (before that 1983-84). Pulled engine and lifted head 1987, replaced valves. Pulled engine and opened it completely 2010-2013. Installed frame mod early 2014 when I had to replace HD studs and refurbished head. Tried different cams after that when it's easy and no need of pulling the engine.

This time 2015-2016  APE crank with Carillos so I do not need to think about rod thru case  + undercut trans when open + head job again. I'm happy to find the hub upgrade. I hope the rubber quality is good.

CB750 prim hub rubbers are very easy to change, just send the hub to the guys doing the job as I did.   

[seanbarney41]

No worries PeWe.  I was just funnin ya.  It's guys like you that end up contributing such major amounts of info to this site through your tireless wrenching and posting.

[PeWe]

This site is very fun. 
I have got a lot of additional costs thanks to the wrenching guys posting here!
I had to remake my first restore intentions from 2010 when I had ideas to just get my old bike running, not much more. The bike had suffered some during the 20 years in barns. I have found that photos of most of my steps helps me later on when I need to know what and how I did.

Got  a lot of ideas here to make it closer to how it looked from the beginning. I have passed the barrier "Are you completely insane!? Pay that much for new tank set, 4-4, new carbs etc etc..." 

Posting photos here is useful for others that can see how. I have searched here many times to see how it look like when I'm not sure things are correct or not.

[RAZZ]

This site is very fun. 
I have got a lot of additional costs thanks to the wrenching guys posting here!
I had to remake my first restore intentions from 2010 when I had ideas to just get my old bike running, not much more. The bike had suffered some during the 20 years in barns. I have found that photos of most of my steps helps me later on when I need to know what and how I did.

Got  a lot of ideas here to make it closer to how it looked from the beginning. I have passed the barrier "Are you completely insane!? Pay that much for new tank set, 4-4, new carbs etc etc..." 

Posting photos here is useful for others that can see how. I have searched here many times to see how it look like when I'm not sure things are correct or not.

+ 1

[drumstyx]

I'll be honest, I poked the tiny bit of rubber I could see through the cover, saw that it gave and wasn't brittle - and called it good. 

Same. It's definitely not in terrible shape; better than the rear cush drive rubbers!

[BPellerine]

I think that the replacement of these rubbers came from the performance side of thing where they are putting big power loads on them,not so much the average rider.bill

[UnclearFizzyCyst]

Because your time's precious and you don't want to spend twice your allocation pulling the engine apart a second time (back in the 70's my best tear-down and re-assemble time was 4 and a shade hours, CB400 F0, after much practise)

[BrianAdair]

I know this thread is 2 years old, but I am currently rebuilding my K0 engine and the primary sprocket has been on my mind.
The 50 year old rubber dampers in it, I sure hate to do all new bearings, chains, and tensioner, among everything else on the top end, and leave this part, for fear of the rubber disintegrating.

I contacted this company in Germany http://www.fourever-classic-parts.de/index.php?option=com_content&view=article&id=26&Itemid=31

I did get one response, saying they still do the service, and they asked where I was from. When I responded saying I'm in Texas asking where to send it, and what the total cost was, I have not heard back.
Do they not ship to the US?
Has anyone from the US used them for this service?


I know there is the kit from France you can buy and do yourself, ( if it ends up I cant send to Germany I may go this rout) but I feel better about the rivets instead of the screws.
Cylce X also does it but they also bolt it back together, and they are $$ on it.

[BrianAdair]

Well, I got a response after sending a 2nd email.
They do not ship outside of Europe.
Dang... ☹

[my name is nobody]

I have the one from cyclex, (my old one rebuilt) Around 175.00 iirc...Happy with it so far. Quick turn around
too. Looks like a quality part. don't have a lot of miles on mine yet, maybe a thousand
or so, but been trouble free so far fwiw.

[bryanj]

Brian, as long as you pay the shipping i will happily be middle man as i am in UK, two lots of shipping might work out too dear though.
I am Bryan in the UK by the way!

[BrianAdair]

Thank you very much for that offer Bryan!

I will keep it in mind for sure and may take you up on it, if I can't  find a rout here in the states.
I have message into a guy on the Sandcast Facebook group, that says he has kits available, maybe the same guy that has the kits in France, I'm not sure.
Then there is Cycle X..
As you said, the shipping may be a killer, I would assume that it would be around $40 to you and then $40 back, not sure what it would cost from you to them, and back?
The cost of their service isn't bad at all $78.36 USD. but shipping to and from may be around $140ish..?
I know the kit from France is $87 + shipping.

I'm going to weigh all my options and see.

Thanks again!

[Erny]

I know this thread is quite old, but was not able to find better one

I'm preparing for clutch rubbers in my CB550K clutch basket - are rubbers the same for all 500/550 and also 650?
Can somebody recommend proven quality source for them?

[newday777]

I know this thread is quite old, but was not able to find better one


I'm preparing for clutch rubbers in my CB550K clutch basket - are rubbers the same for all 500/550 and also 650?
Can somebody recommend proven quality source for them?

What year is your bike?

[Nurse Julie]

False economy not to replace them when restoring the engine on 50+ year old bikes.

[newday777]

I know this thread is quite old, but was not able to find better one

I'm preparing for clutch rubbers in my CB550K clutch basket - are rubbers the same for all 500/550 and also 650?
Can somebody recommend proven quality source for them?

The clutch basket doesn't show rubbers in the fiche

https://www.southsoundhonda.com/--xpartsstream#/Honda_Powersports/CB650A_(79)_MOTORCYCLE%2c_JPN%2c_VIN%23_RC03-2002472/CLUTCH/4586fa29-5cc9-4653-8e8c-52f5871f6742/4c366631-1d96-4ddb-be92-20b14a6caff0/y

[Erny]

I know this thread is quite old, but was not able to find better one


I'm preparing for clutch rubbers in my CB550K clutch basket - are rubbers the same for all 500/550 and also 650?
Can somebody recommend proven quality source for them?

What year is your bike?

it is CB550K K1 1975

I know the fiche does not show them as basket rubbers were designed not to be replaceable. But in reality they harden and wear.
https://www.youtube.com/shorts/W4neSdbf_I4

[newday777]

All I have is CB750s and haven't had a 550 basket apart to know what they look like.

[craz1]

I replaced the primary chain and rubbers on my build. I tend to split the cases and check everything for wear and damage. Those rubbers were rock hard. If they are available replace them. I always replace the cam chain so thats the main reason for the case being split. This CB550 is one of the smoothest bikes in my collection.

Im working on an 82 XJ550 Yamaha with pretty much the same type of rubbers and they were also rock hard. There is a noticeable difference in texture on the new rubbers.

[Little_Phil]

I know this thread is quite old, but was not able to find better one


I'm preparing for clutch rubbers in my CB550K clutch basket - are rubbers the same for all 500/550 and also 650?
Can somebody recommend proven quality source for them?

What year is your bike?

it is CB550K K1 1975

I know the fiche does not show them as basket rubbers were designed not to be replaceable. But in reality they harden and wear.
https://www.youtube.com/shorts/W4neSdbf_I4

That link is CB750 I think. 500/550 rubbers are only in the primary shaft, next to the started sprag clutch. Recommend replacing them. Easy job when replacing P chain.

[PeWe]

I have sent 4 primary hubs to Germany for restore, replacing the cush rubbers.
For CB750. They do CB500/550 too
https://www.fourever-classic-parts.de/index.php?option=com_content&view=article&id=26&Itemid=31

My first in my K6 2016 has been massaged with around 100whp most of the time. Last years dynos 107whp. So the rubbers keep well together

My K2  2019 58whp.

The last 2 (this year).

I really recommend Fourever-Classic-Parts.

Contact them via email
nagel@fourever-classic-parts.de

Send your primary hub to them with instruction to replace the cush rubbers.
If needle bearings inside are bad they can fix them too.
If same design as CB750.

They have other parts and services too.

[Little_Phil]

If you are talking about clutch basket, I've never found any movement on mine and didn't know parts were available.

[Erny]

I know this thread is quite old, but was not able to find better one


I'm preparing for clutch rubbers in my CB550K clutch basket - are rubbers the same for all 500/550 and also 650?
Can somebody recommend proven quality source for them?

it is CB550K K1 1975

I know the fiche does not show them as basket rubbers were designed not to be replaceable. But in reality they harden and wear.
https://www.youtube.com/shorts/W4neSdbf_I4

That link is CB750 I think. 500/550 rubbers are only in the primary shaft, next to the started sprag clutch. Recommend replacing them. Easy job when replacing P chain.

No, that video is my own video I did on my CB550K1

really CB500/550 and 650 too all have rubber dampers like 750 has, just different.
What year is your bike?

[Tracksnblades1]

I know this thread is quite old, but was not able to find better one

I'm preparing for clutch rubbers in my CB550K clutch basket - are rubbers the same for all 500/550 and also 650?
Can somebody recommend proven quality source for them?

BWaller posted on page one rubbers are still available and easy…. Oops farther down he writes not available. As well as the clutch dampeners not so easy…🤪

Parker Hannifin (Parker Hydraulics)  used to sell oring cord by size od and by the foot..and the glue to make big oring gaskets. I’m sure they still do.. The oring stock could be ordered by durometer to meet your task at hand. I’m sure you could order 60 and 70 durometer stock but not sure about the higher durometers because I’ve never used them. You could cut one of your old ones into and check the durometer, that’s what I plan to do. They make razor blade guillotines that can cut oring stock square. I always used a vertical belt sander to chamfer the edges too. PEWE has put some higher horsepower through the German ones, so that would be a good durometer I would think if you’re going to go high hp and go thrashing through the gears.

I’ve used 60 and 70 durometer in large planetary 2 speeds. The steel separator plates between the clutch plates have special holes in them where these cut to length oring cords are pressed in. They’re used as a non metallic spring to help keep the non engaged clutch steels and clutch plates separated, Preventing them from rubbing together while not in use causing premature wear. In Addition they assist the return of the clutch application piston since they’re compressed while in that speed. Helping prevent excessive wear while one speed drops out as the other selected speed engages. They are very durable lasting 12,000 hours or longer in that application.