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CB500/550 / Re: top end gasket set recomendations
« Last post by Nurse Julie on Today at 10:23:16 AM »
It depends which gasket set you use as to the size O rings you will need. All the kits have different depth head gaskets.
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Project Board / Re: Teds new project a CB500 K1 mostly version 0.5 circa 1972.
« Last post by McCabe-Thiele (Ted) on Today at 10:22:07 AM »
Quote from: Bryanj on May 04, 2024, 08:55:55 PM
550 and 500 same shape but later ones had a connector bit, the screwed in retainer does not have a seal, only the big tim pressed plate

So the seal fits into the sprocket cover plate Bryan not the retainer ring - that makes sense.

PXL_20240505_084731863 by Macabe Thiele, on Flickr
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Desperately Seeking!! / Re: 400/4 Air Filter 'Panching Plates'
« Last post by AshimotoK0 on Today at 10:21:17 AM »
Putting the plates in the post 1st thing Tuesday Dave  :)
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Anorak's Corner / Metal Covered Plug Caps
« Last post by AshimotoK0 on Today at 10:18:41 AM »
My UK 750K0, CB400F & 450K0 Bomber all came originally with metal plug caps.

Much maligned on here I know but for originality I am fitting them. I managed to get NOS ND ones for my 4 cylinder bikes  but the Bomber ones are hard to come by. also one of my NOS 4-cyl ones got badly damaged with acid. So this week I managed to de-crimp the corroded one and replated a grotty looking Bomber one. Pretty sure my CB250K0's and K2 would have had them but not found any of those yet.

I plan to do some tests on them to see why they tracked over the HT in the wet. It's not obvious looking at them why they would track. I suspect the rubber insert may not have sealed too well but a new part moulded in silicone may fix it. A lot of heathen dealers (like the one who supplied my 1st 400F ) just ripped the metal covers off and damaged the grey plastic body in the process.

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CB500/550 / Re: top end gasket set recomendations
« Last post by Johnwebley on Today at 08:49:58 AM »
I have a local source for most O rings

A company called Hayley Group

On a local industrial estate, the Hereford branch are really helpful,

Imperial, metric,fuel resistant etc,

And the bonus, normally a fraction of the cost of NOS,

Take a sample, and the item, like tappet cap ,they will find the size needed



Sent from my SM-A546E using Tapatalk

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Project Board / Re: Making space for the bikes
« Last post by DomP on Today at 08:27:35 AM »
I'll fill it up with stuff in no time I'm sure, I'd have lived to have gone bigger but I'm doing it within permitted development rules (I think) and getting this far has cost a small fortune
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CB500/550 / Re: top end gasket set recomendations
« Last post by DomP on Today at 08:18:22 AM »
Maybe get the block skimmed which will make the oring recess slightly shallower, that's what I did following Brian's advice after he rebored my block.  I used Vesrah gaskets from DS
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CB500/550 / Re: top end gasket set recomendations
« Last post by neat street on Today at 07:52:55 AM »
Thanks Brian, good to know and will have saved some headaches later. :-)
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CB750 / Re: Yhc-184 regulator rectifier
« Last post by SteveW on May 04, 2024, 11:03:17 PM »
Ages since I wired mine in but from memory they go back to the white and green on the exciter coil. This was on my 550 K0.
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CB500/550 / Re: top end gasket set recomendations
« Last post by Bryanj on May 04, 2024, 10:49:26 PM »
All head gaskets are now thicker than Honda original due to no asbestos used in manufacture but the suppliers still give you the original size O rings so they dont seal as well.
If you go to the US site and look up Mark Paris (Hondaman) he can sdvise on size, i dont have all my books to hand
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