Help with Comstar Front Wheel Inner Sleeve dimensions. Part number: 44620410000

[Aidy B]

Hi All,

Nice to meet you all.

Just a quick introduction as to not appear rude by simply diving straight into asking questions.

My name is Aidan (Aidy). I live on a sleepy little island in England called the Isle of Wight.

I am a Vintage Aircraft Restorer at a company called Airframe Assemblies Ltd. My Dailly job is to restore Vintage warbird Airframes. Mainly Supermarine Spitfires but also Hawkers, Messerschmidt and Focke Wulf too.

I've joined this forum because I have 2 CB750'S that I intend on restoring that belonged to my Grandfather. He died many years ago and I have nothing at all to show of him other than these 2 bikes. I'm not really wise about Honda's so I've made it my mission to learn as much as I can from the experience of others who are wise and knowledgeable of these bikes.

My aim is to (Rather Cliché I imagine) turn the SOHC one into a Cafe Racer and restore the DOHC one to its original condition as it belonged to him. I'm not very clued up with these bikes. The SOHC bike is registered as being 1976. But what is strange is it has Comstar wheels. From what I read it's a CB750F1? Is that correct? I assume that at some point somebody has swapped the wheels over for disc brake upgrades both front and rear.

I am converting the wheels to spoked wheels using special kit and precision gear at work. However Ilmy main issue, that I wish to ask a question about is that I seem to be missing an Inner Sleeve/collar/spacer for the front wheel. The part number I believe is: 44620410000

What my question to all of you wise Honda-Heads is. Can anybody please give me the dimensions of this inner sleeve that I'm missing? If anybody could give me the precise length, inner diameter, outer diameter and the material it is made from? It will allow me to machine one at work on the lathe, from scratch.

All of your help, knowledge and experience is greatly appreciated.

I have highlighted the inner sleeve that I am talking about on the photo.

Kindest regards

Aidy

 

[hinksy]

Aidy , the comstars were from 77 on , F2 , pic for reference and then smaller cb`s , cx`s and cbx`s . If you cannot get the part , it is just a sleeve between the two bearings and will be a not so tight fit as to allow the bearings to seat . It will fit the dimensions of the axle diameter and be 2-3mm thickness . I just did all of mine at the end of last year and can say there is some side to side movement without an axle . I suppose they use it to space the bearing when the front axle is tightened up . I can also say it wasnt a mild/heavy steel , it was quite light and possibly an alloy . Hope this helps

 

[Aidy B]

Hi Hinksy,

This helps a great deal! Thank you for your time and experience in helping to answer my question. So it is an alloy. I wondered if it might be as commonly they are aluminium. But I had no guarantee. Also, it's great to know the wall thickness too. That helps me work out the OD. Thank you for confirming this. Greatly appreciated.

I don't know what the story is with the wheels. It could be that the bike is an F2 and not an F1 and was registered later and there is something weird about the way the bike was registered. Our road registration system in this country is pretty weird at times. Or what I also wondered is if it's an F1 but at some point in time somebody has swapped out the wheels/forks for the upgraded disc brakes. All a mystery that I will continue to investigate. So thanks for the extra knowledge on the different models too. This helps a great deal too.



My original plan was to seat one bearing and then measure from the inner face of the inner race of the bearing up to where the opposing bearing seat is and get the length by that. I want to get it as close as possible. Usually these inner sleeves in wheels are there as to not to overload the inner races of the bearings, when the axle spindle/bolt is torqued up. Which will lead to premature failure. So I don't want it too sloppy.

Thanks again Hinksy

Appreciate your help.

If anybodyelse has one kicking about that they can measure for me, for exact sizes. That will also be great. But the information you have told me, is more than good enough to crack on and machine one up.

Thank you

Aidy