Topic: 1971 CB750 K1 Restoration Project- Restoring Still...

[denward17]

Well, If I remember correctly, one side has a seat that that bearing needs to be set to.

The other side does not have a seat.  I think I would pull from this side.  The side that doesn't have the seat would be my vote.

[Oly]

Well, If I remember correctly, one side has a seat that that bearing needs to be set to.

The other side does not have a seat.  I think I would pull from this side.  The side that doesn't have the seat would be my vote.

Thanks Dennis...I'm not quite sure which side it is you are referring to.  Is it the side where the speedo gear box is or the side where the retainer screws into?

[denward17]

I think the side with the retainer ring is probably the side that the seat is on, if so, it would be the other side to pull.

[BenelliSEI]

If the centre “tube spacer” is fitted correctly, no amount of tightening the axle should  jam the bearings. That’s the purpose of the spacer. Are the centering tangs on the spacer all free to spin with the bearings? Also, make sure the fixed pad on your brake caliper is backed off. If its’s adjusted too tight it may be jamming the disc and preventing rotation?

Sounds like you have the speedometer drive tangs engaged correctly, but check again. They can jam rotation if out of their slots. You have the axle spacer in the other side?

[Oly]

If the centre “tube spacer” is fitted correctly, no amount of tightening the axle should  jam the bearings. That’s the purpose of the spacer. Are the centering tangs on the spacer all free to spin with the bearings? Also, make sure the fixed pad on your brake caliper is backed off. If its’s adjusted too tight it may be jamming the disc and preventing rotation?

Sounds like you have the speedometer drive tangs engaged correctly, but check again. They can jam rotation if out of their slots. You have the axle spacer in the other side?

John,
  The front wheel assembly isn't loaded into the caliper, but is on my bench with the rotor and speedo gear box removed and the bearing retainer is unscrewed and removed.
When I rotate the inner race of each bearing the spacer rotates also, so I believe the tangs are in their correct location.

[Oly]

Re: Axle will not move freely after front wheel bearing replacement (May 16, 2018, 12:13:22 PM by Phinn)
[/size]
The inner hub spacer should be barely movable (with your finger) before you install the axle and tighten everything down. You should be able to spin one bearing one way, and the other the opposite way. Touching the inner spacer, but not hard against it.
Once you button it all up and crank down the axle nut, then the two inner races will sit hard against the inner spacer. That’s what the inner spacer does: brace the inner races so they don’t get crushed inward toward each other, thereby throwing one or both of the inner races out of alignment with its out race. They don’t roll well that way, and will cause the rollers to chew themselves up.

Above is a portion of a SOHC/4 forum discussion from 2018 about this same issue.  The portion I have in red talks about being able to rotate each bearing inner race independent of each other (i.e.: bearings are just lightly touching the inner spacer allowing their independent rotation, prior to tightening the axle down)

I cannot rotate each of my bearings inner races independently, as they are pressing onto the inner spacer too far, therefore my thought that one of the bearing is pressed in deeper than it should be.

[BenelliSEI]

Oly…..want you say makes sense. I can think of no other explanation. I still don’t understand why tightening the centre portions of the bearings closer together would stop them turning? That suggests the outer races are too far apart??

[Oly]

  I followed the Hondaman book on Page IIIB-6 when assembling the bearings after removal to inspect them.  His direction related to being cautious when driving the bearings back into the hub to not put too much pressure on the collar (internal spacer between bearings) matches the other discussions I've found on the forum.  Reference his direction for correcting the issue of having them too tight (see attachment blue underline). 
  I'm hoping that using the slide hammer bearing removal tool I have will allow me to perform the same thing as he has describe, but that's where my confusion on which bearing needs to be moved outward to loosen up the fit.  Mark's book details that it is the left bearing (Rotor side of wheel) he says needs to be moved outward and the other forum discussions related to this issue describe moving the right side bearing outward.
  Clarification on which bearing to pull on would be greatly appreciated before I make another rookie mistake
Thanks!

[PeWe]

The side without a seat, bearing sit flush wirh hub.
Other side with a seat, press bearing until a very light contact with the spacer that still should be possible to move sideways with a screwdriver.

I made a mistake to press a bearing 0.2mm too deep on the non seat side.
I had to use a 0.2 mm shim with the same diam as the inner race to compensate. I did not want to destroy the bearing by knocking it out. I had already  consumed a few.

Same for rear hub

Much easier in the 80's when I had access to a press. Did it correct on a coffee break or lunch.

 I used the old bearing's race as a tool to punch on. A press will guarantee a straight and smooth force downwards. No wiggle abusing the hub.

A good idea to order a double amount of bearings.  A miss that hits the bearing's rubber seals and balls inside might  have damaged the bearing. Short life.

Same when ordering drive chains  with rivet master link. It will not be right first time.
Minimum one extra master link.

[BenelliSEI]

Oly….. funny. I’ve done this many times and never had an issue, but I can see how it could become a problem. I’d back out the speedo drive side bearing. Isn’t the other bearing’s location fixed by the shoulder in the hub and the retainer? Then tap the speedo side bearing until it just makes contact with the spacer….. ultimately when the axle is tight it should still spin freely.

[Oly]

   Well I went after the speedo side bearing with my bearing puller in an attempt to move it slightly out and relieve the inner collar (spacer) a little and it wasn't budging easily, so I got the heat gun out and warmed up the hub a little.  After a couple attempts it moved out even more than I needed, so I was able to press it back into the just right position leaving the collar barely touching and movable easily with a screw driver.
I assemble everything once again expecting this to solve the problem, but to my surprise with just finger tightening the axle bolt it still didn't rotate easily.  Took it apart for the umpteenth time, where I saw that I had let the 2 keying tabs internal to the speedo box move slightly out of alignment... corrected that and back together again.  Success!!!!  What seemed like such a simple slam it together assembly taught me to be aware of all the little details. 
Thanks to everyone for your input.  I think it's beer thirty!

Tomorrow, it's bleed the front brake system, while being attentive to the details I've been given.

[BenelliSEI]

Well done! I often manage to horribly complicate even the simplest tasks.

[MauiK3]

That's one job I've always wondered about, it seems a bit less certain than other parts of the bikes.

[Kelly E]

Oly, pretty soon we'll have the weather to get the bikes out. I'd like to see your bike when it's done.

[Oly]

Well done! I often manage to horribly complicate even the simplest tasks.

I'm with you John.  This didn't seem like an assembly that would have taken so much of my time until it did!
Just glad I didn't have to take it apart and put it together any more, along with concerns over ruining the bearings during the process... lol

[Oly]

Oly, pretty soon we'll have the weather to get the bikes out. I'd like to see your bike when it's done.

  Most definitely Kelly!  I'm looking forward to completing this project while I still have the health to get out and put some miles on it. 
  Like John has said..."it's the planning & details of the rebuild journey that gives me great pleasure also, but I'm sure once I'm up riding it again that will open another whole new level of excitement. 
  Hell, It's been 35 years since I've licensed it.
A quick question Kelly.  Do you register your 35 years or older bikes with a collectors plate for the one time fee this state offers?

[Kelly E]

Oly, pretty soon we'll have the weather to get the bikes out. I'd like to see your bike when it's done.

  Most definitely Kelly!  I'm looking forward to completing this project while I still have the health to get out and put some miles on it. 
  Like John has said..."it's the planning & details of the rebuild journey that gives me great pleasure also, but I'm sure once I'm up riding it again that will open another whole new level of excitement. 
  Hell, It's been 35 years since I've licensed it.
A quick question Kelly.  Do you register your 35 years or older bikes with a collectors plate for the one time fee this state offers?

I have all of my bikes and MG's on collector plates. This year the state sent out warnings to everyone with a collector plated vehicle about the rules. I think Gov. Side Show Bob is shopping for more revenue and since he hates cars he'll go after the gearheads for collector plate violations.

[Oly]

I have all of my bikes and MG's on collector plates. This year the state sent out warnings to everyone with a collector plated vehicle about the rules. I think Gov. Side Show Bob is shopping for more revenue and since he hates cars he'll go after the gearheads for collector plate violations.

Yes, I saw this notice:
  New Requirement (Jan 2026): As of Jan 15, 2026, applicants must prove ownership/registration of a second daily-use vehicle, or request an exception.
  Is that the one you're talking about?

[Kelly E]

I have all of my bikes and MG's on collector plates. This year the state sent out warnings to everyone with a collector plated vehicle about the rules. I think Gov. Side Show Bob is shopping for more revenue and since he hates cars he'll go after the gearheads for collector plate violations.

Yes, I saw this notice:
  New Requirement (Jan 2026): As of Jan 15, 2026, applicants must prove ownership/registration of a second daily-use vehicle, or request an exception.
  Is that the one you're talking about?

Yep, that's it. Our highly efficient state decided that one notice wasn't enough so they sent me six. One for every vehicle on collector plates.

[Oly]

Well here's the definition of how you have to use the collector vehicle:

  Usage Restrictions: Must be operated as a collector vehicle (parades, shows, pleasure), not for general daily transportation.

  I guess I'll always be going to a parade, a show or just having a pleasurable drive with my collectors vehicle if they ever ask!  LOL

[MauiK3]

Out here, it seems whenever I'm out putting around town it's like a parade because people stare and seem to be thinking "what is that?". Lots of Harleys and scooters here.

[Kelly E]

Well here's the definition of how you have to use the collector vehicle:

  Usage Restrictions: Must be operated as a collector vehicle (parades, shows, pleasure), not for general daily transportation.

  I guess I'll always be going to a parade, a show or just having a pleasurable drive with my collectors vehicle if they ever ask!  LOL

Don't forget testing of recently completed repairs but since everytime I ride is a pleasure ride because I'm retired I'm good to go.

[Stev-o]

Well here's the definition of how you have to use the collector vehicle:

  Usage Restrictions: Must be operated as a collector vehicle (parades, shows, pleasure), not for general daily transportation.

  I guess I'll always be going to a parade, a show or just having a pleasurable drive with my collectors vehicle if they ever ask!  LOL

Don't forget testing of recently completed repairs but since everytime I ride is a pleasure ride because I'm retired I'm good to go.

Collector plates in Texas have similar restrictions including riding for maint purposes and testing. 
I am always testing!

[MauiK3]

We don't have collector plates here, in fact, we have quite a few (a lot) of vehicles with either no or expired plates. It seems to be a low priority for our various police departments on the islands.

[Kevin D]

Every ride is a test ride….
Every ride is a parade….

It’s 55 years old
100,000+ miles

I found my original plate deep in a desk drawer
It has been on my CB for many years without issue