SOHC.co.uk Forums > CB500/550
Aiboxes and airfilters for CB500/550
deltarider:
If your (beautiful) bike was mine, I'd try the CB500 OEM airfilter element. Filtering area seems oversized compared to the 550 ones and they live forever. You'd have to reroute the crankcase breather tube though the way the CB500 has.
Oddjob:
I'd second that. Ditch the recycling system of the 550 for the simple and more direct system for the 500, just vent it to air. You'd have to use the 500 filter or the hole in the bottom of the 550 filter will just let unfiltered air into the engine.
Erny:
I plan to re-route breather hose as '76 550K had (see attached pic).
But I already bought that 550F filter from ebay... let's see how it will fit.
Will report back ;)
Thanks for your advices/opinions
deltarider:
Thanks to Nurse Julie*, we now know that that pic is incorrect (an error by Honda) and that it is actually the drain tube coming from the bottom of the airfilter case. Honda has had me fooled for years and also has left me wondering why nobody has ever seen a CB550K2 with what is suggested in Fig.K2-1.
The origin of that error may have to do with a CB500 model which was also assembled in 1976: the CB500K2 (ED, F, G) aka GENERAL EXPORT. Note that all modifications in p.170 also apply to that particular CB500K2 model and that model still had the conventional routing of the tube in real life.
Another possibility is, that at the time the CB550K2 addendum was composed, Honda was unaware that the US, where the breather system was law, was to be the only country where the K2 would be marketed. Maybe a CB550K2 GENERAL EXPORT at that time was not of the table.
Now that you have that air filter element, I would either plug the hole in the bottom of it or, when you prefer to have it as designed, maybe not have the oil level higher than halfway the dipstick, like the Germans and also somebody in the international forum have suggested.
This German shop has all: https://www.cb-four.de/cgi-bin/shop/__CB-550-K-F/Verschleissteile/_04.08.html The mere changing of the middle number into -404- has not much significance. Back then, when the K3 was lauched, Honda has renumbered lots of parts to: -404-. Some parts were still the same as before however.
* starting here: http://www.sohc.co.uk/index.php/topic,27043.msg250107.html#msg250107
Sesman:
Now I’m really confused. Which models breath to atmosphere, which models breath to the airbox. There is no mention of the intake manifold drain….perhaps that’s not relevant to the topic.
Honda made an error…never🤔
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