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cb750 oil change, info please.

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K2-K6:
The washer is desirable in keeping to original specification certainly.

It's not  disaster or particularly any failure to run without because of the arrangement of the spring and filter etc.

Technically correct to use it as it prevents the open end of spring embedding into the filter rubber, but unlikely to give much in the way of side effect if left out.

Oil route through filter housing is to flood whole chamber from oil pump pressure side, oil then to exit via filter membrane, into filter bolt bore, then onwards into engine gallery.

The only alternative is if the filter becomes too blocked, the the oil goes into the filter bolt bore in the spring area by pushing open the internal valve in that bolt, to effectively bypass the filter material.

It'll all work with or without that washer, but worthwhile keeping to original design in getting a replacement. 

matpp:
Thanks guys, ordered from France, same part number with Vintage bike company: I suspect they buy from David Silver 👍

Oddjob:
I've seen a few bikes, when doing servicing, where the washer was missing and the spring went completely through the rubber ring on the filter, this allowed the filter to move up the bolt and in effect took it out of the system allowing unfiltered oil to pass around it. Not ideal. Always best to have it fitted if only to prevent the above happening.

Bryanj:
What happens is the owner does the "easy" oil change himself/herself does not know about the washer does not notice it stuck to the filter and throws it away.
It is not 100% necessary if you change filter regularly but is desirable and if it wasnt needed Honda would not have fitted it.
I worked for a big Honda dealer in the 70's and when i started they had never sold one, 9 months later they were ordering 5 at a time!

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