Topic: 78 cb550 pd46c carb manifold o ring gasket ??

[evopgt]

Does anyone have a part number for the o ring gaskets between the intake manifold and engine block?? 78 cb550 pd46c carbs. Mine seem to be kind of flat and may not produce a proper seal. Thanks

[CycleRanger]

You can download the parts list here:
http://honda4fun.com/materiale-documentazione-tecnica/parts-list/parts-list-cb550

PN 91302-001-020

Although I have seen mentioned that other folks have used the more common and cheaper 30x3.5mm o-rings for this application.

[evopgt]

Thanks for that list! Got 4 for about $12.50 from 4into1.com

[Deltarider]

Same O-rings that are under the 8 valve adjust covers, ⌀ 30,8 mm and they're widely available.

[CycleRanger]

Same O-rings that are under the 8 valve adjust covers, ⌀ 30,8 mm and they're widely available.

30.8 x 3.2mm  widely available but pricey at ~$2.50 or so each. 
Unless you have a cheap source.

[DaveBarbier]

For the future, here are all parts diagrams for your bike. https://www.cmsnl.com/honda-cb550k-1978-usa_model7222/partslist/


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[Deltarider]

It's better to use the parts list itself. In the first few pages of every parts list you can determine what specific model you have. Not only that, the list will give you the complete overview and you'll spot differences between models for various markets. Then you can judge what part meets your desire best. An example: if the PO has changed the handlebars for those that were on models for Europe and you, unaware of this, would order cables that you've found in those fiches, you'll end up with the wrong ones. This has happened more than once. Just consult the original parts list and you'll have the complete story. As a bonus you'll understand more about your bike.