SOHC.co.uk Forums > CB500/550
Pyramid Parts Tapered head bearings.
AshimotoK0:
Thanks for replies chaps.
The jury's kind of out then. I may just trial fit the kit with 2 standard Honda washers + the rubber/metal seal that comes with the original kit and see how it goes. This will kind of replicate what Ken suggested. I have a really nice Honda puller to remove the bottom race if I need to adjust.
Dave ... (Laderda Dave) ... a guy on VintageHondaTwins had problems on CB350 and found that there were two types of chrome top nut. One was fully threaded down to the bottom of the nut but another had a few mm unthreaded. He added a pic with both types side-by-side but I can't find it to show everyone :-[
Good luck with your recovery Ted !
AshimotoK0:
--- Quote from: AshimotoK0 on October 23, 2025, 08:08:27 AM ---Thanks for replies chaps.
The jury's kind of out then. I may just trial fit the kit with 2 standard Honda washers + the rubber/metal seal that comes with the original kit and see how it goes. This will kind of replicate what Ken suggested. I have a really nice Honda puller to remove the bottom race if I need to adjust.
Dave ... (Laderda Dave) ... a guy on VintageHondaTwins had problems on CB350 and found that there were two types of chrome top nut. One was fully threaded down to the bottom of the nut but another had a few mm unthreaded. He added a pic with both types side-by-side but I can't find it to show everyone :-[
Good luck with your recovery Ted !
--- End quote ---
I got it wrong Dave .... here is the thread ;D on VHT
https://www.vintagehondatwins.com/forums/threads/issue-installing-allballs-steering-bearings-solved.1063/
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Murf:
AshimotoKO The photo of the nuts showing the raised ridges where the two parts, nut and domed cover are fused together is interesting. Not just for the reasons you have posted them but also because the raised ridges are another reason I did not use the pyramid bearing kit.
The top of the original cup and cone bearing sits perfectly on the flat area within the raised ridges, whereas the taper bearing is wider meaning that the ridges sat on top of the bearing edge and the pressure to the bearing from the nut was just being applied by the ridges. I felt this was totally wrong.
Yes I could have made up a washer to fit that would have transferred the forces into the flat area of the nut but thought why should I mess around trying to make something that is not right fit. Especially when I already have something that fits perfectly and designed for the bike.
I felt that the pyramid kit was probably designed on a computer without anyone ever trying it out on an actual bike.
BTW I have nothing against computers and like tapered bearings as head bearings, just hasn’t worked for me this time. 😁
Bryanj:
Most of the taper bearing kits are a standard taper bearing with the od of the outer race ground to the size that fits the steering head, maybe some firms now make specials, i dont know,
Laverda Dave:
--- Quote from: AshimotoK0 on October 23, 2025, 09:09:55 AM ---
--- Quote from: AshimotoK0 on October 23, 2025, 08:08:27 AM ---Thanks for replies chaps.
The jury's kind of out then. I may just trial fit the kit with 2 standard Honda washers + the rubber/metal seal that comes with the original kit and see how it goes. This will kind of replicate what Ken suggested. I have a really nice Honda puller to remove the bottom race if I need to adjust.
Dave ... (Laderda Dave) ... a guy on VintageHondaTwins had problems on CB350 and found that there were two types of chrome top nut. One was fully threaded down to the bottom of the nut but another had a few mm unthreaded. He added a pic with both types side-by-side but I can't find it to show everyone :-[
Good luck with your recovery Ted !
--- End quote ---
I got it wrong Dave .... here is the thread ;D on VHT
https://www.vintagehondatwins.com/forums/threads/issue-installing-allballs-steering-bearings-solved.1063/
(Attachment Link)
--- End quote ---
Interesting post Ash. I read the link to the US site and it does appear to be pot luck if the kit will actually fit the bike it is advertised for and the type of modification required. I agree with the guy who said he'd had enough of trying to make it fit and was going back to stock because there was a mountain of other work required on the bike. That's exactly how I felt at the time, I spent hours trying to get them to fit and calling and sending mails to Pyramid with photos as they requested. I gave up in the end and fitted caged balls.
There is very one interesting comment one guy made and that was to measure the original bearings in terms of height on the stem and then to measure the height of the tapers and that would give the thickness of washer required although this method will not work if the taper bearing race sticks out the top of the upper bearing housing as mine did.
As for the bearings themselves, these can be bought from Simply Bearings much cheaper (and better quality) than the supplied kits. Simply Bearings can also supply washers.
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