Pic for Trigger showing funny ring that goes under three piece oil ring on K0

[AshimotoK0]

Here goes Graham on K0 funny oil control ring under main oil ring. Hondaman told me to discard the funny ring.

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[AshimotoK0]

Can't see it myself Ash, all I can see is the old style oil control ring which was cast in one piece before they started to use the 3 separate part oil rings.

No3 looks odd though, can't seem to place where or what that is.

You can see it here Ken

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[Trigger]

See what you mean now

[Bryanj]

Used a lot on older car style, Its there to help push the oil ring out to the cylinder wall which the centre bit on the 3 piece does as well but the thin side bits scrape the oil better than the big thick ring.

That No3 is the little rubber bung between the fins

[MrDavo]

That No3 is the little rubber bung between the fins

Don't start me wanting a set of those again. I thought I was over it.

[AshimotoK0]

That No3 is the little rubber bung between the fins

Don't start me wanting a set of those again. I thought I was over it.

If you buy a Noboru Packing full gasket set the rubber bungs come with it!

[K2-K6]

The top rings always get help to push against the bore by the compression, more of a challenge for rings further down as they're trying to scrape all the oil they can while not raising friction too much.

[gtmdriver]

It's called an expander ring.