SOHC.co.uk Forums > CB500/550

Aiboxes and airfilters for CB500/550

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Trigger:
https://www.cmsnl.com/honda-cb550-k1-four-1975-usa_model466/housingaclnr-elem_17313374003/

https://www.cmsnl.com/honda-cb550f2-super-sport-550-four-1977-england_model17121/case-element-seal_17313390780/

Looks the same to me  :o

Erny:
yes, but if it is the same, why the hell Honda does not show it is?
Honda would either use 374 code for 390 model or says 390 parts supersedes 374 one... but this is not the case.

Trigger:
You must think outside the Honda parts manual  ;D The 550K3 has the same air box but, has a different filter but, that is only because of the length of the pipe on the cover'element. The F1 air box is different to the F2 but, it is only a foam pad on the outsides.
I know lots of Honda parts that have the same part number but, look different and lots of superseded parts that may fit but, look different to the original part  ;)

I could of advised you to replace your air box with a CB550F or a CB550K3 but, that would of been a waste of money and time  :o   

Erny:
Great,

so conclusion is that I can buy F filter and it will fit into my airbox, for example this one https://www.ebay.de/itm/124801958267?epid=1014623385&hash=item1d0ec6c17b:g:nJ8AAOSwOupg5dEW&shqty=1&isGTR=1#shId

Trigger:
If you look up the difference between the 374 and the 323 filters, the only difference i see is there is a hole in the bottom of the 374 so, the tube can fit.
There are a few differences between the 374 and 390 filter but, i think with a few mods it should fit.

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