SOHC.co.uk Forums > CB500/550

Fork Top Nuts

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andy120t:
My CB650 runs 35mm forks that slot into a set of Cb550 yokes. They have various air assist elements on them (pipes, valves etc) that look messy, foul my handlebars & that I don't really want.

Anyway, I thought that rather than try to blank off the various holes it might be simpler and easier to replace the nuts at the top of the stanchions with some "standard" ones.

My questions is,  does anyone know if these fittings / threads for these nuts are the same size for my bike as for the 550? If so, can I just pick up a set of nuts from the more common 550 stanchions and use those?

...and here's a piccie of the RHS fork top so you can see the nut/fittings I want to eliminate. The air valve sticks up and fouls the handlebars when it's in the right position and there should also be a pipe (similar to an old style bicycle pump end fitting) that runs from the hole under the valve to the other fork top.



Thanks in advance!
Andy

Bryanj:
Can't be certain as Honda bought in a lot of forks but if they are the same diameter chances are the threads are the same, if bigger probably not

Yoshi823:
Those air fork caps are very similar to the CBX550F2 ones that I had fitted to the CBX1000ZA forks on my 750/823F2. The Schraeder valve is as per the air valve on the tyres, so not old at all. If you want clean, the fork tops from a CBX1000ZA would fit perfectly, with a small black cap that screws into the fork top. I might have some in my box of bits in the shed. I'll have a look when I can fight my way past the snow to get to the shed...

andy120t:
Be great to know what thread & diameter they are. ..... possibly a piccie if you can battle through the snow?! Thanks.

lordwhimsey:
CB550 fork top nuts are a 28mm x 1.5mm thread



Should poke up about 12mm above the top of your forks and stick 24mm into them, 36 mm overall length.

Hope this helps.

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