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CB550 refurb

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Johnny4428:
Bike fired up and running good but annoyingly an oil leak from the sump pan front and back. So left with no choice but to drain oil and remove sump pan found that the sump gasket rubber is too thin for the groove! (I might be wrong) IMO. I thought about making a gasket to fit but thought I’ll try a thin smear of blue hylomer to see if that does the trick. Has anybody else found this?
I’m quite sure after checking that the mating surfaces were clean.
I wish I had the old gasket I could have compared the two.




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Orcade-Ian:
That's a bummer Johnny,
I had the same problem a while back - can't remember now if it was the 350/4 or one of the 400/4s.  I made a shaped tool out of an Araldite spatula and part filled the groove with Hylomar, then used the tool to leave a couple of mm of it in the bottom of the groove.  Left for a few days to firm up, then used the gasket as normal.  We are starting to experience the same problem that Brit bike owners have had for years, with aftermarket stuff not really fit for purpose,

Ian

Sesman:
TBH, I was surprised at the thickness of the Oring, but to date I’ve had no issues. My O ring came in the gasket set…Twas a Vesrah. I can’t vouch for NE or other gasket sets.

Can the sump oring be supplied separately?

Johnny4428:
Yes Ian unfortunate that not up to the spec of Honda! Don’t know if Honda still supply this part separately Phil. Mine was vesrah kit too. Like your fix Ian! I have ran the bike again and all seems to be fine! Didn’t take much hylomer to seal it. Shouldn’t have to use it all the same.

Oddjob:
If you had a new gasket and could measure the thickness I could compare to a genuine Honda sump oring and we could see if they are supplying thinner ones these days. I have quite a few genuine bottom end gaskets sets for the 500, around 6 or 7 IIRC, the sump gasket is the same as the 550 one, just stuff like the clutch gasket is different. As soon as you use it and it compresses I'd imagine it alters the thickness so measuring a used one probably won't work.

They are available to buy separately, 11398-323-000 which has been superceded to 11398-426-000, which is the CB650 IIRC. Cost about £10-11 plus P&P.

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