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Piston Rings

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RodneyCB750K1979

Piston Rings

I just received new piston rings today for my DOHC 750. They gap .009 to .011 inch. Which ring goes on top? They are both marked "TOP". One ring is shiny and one is dark. The profiles appear the same. No instructions with the rings. Advice??

TOOLS1

Re: Piston Rings

Administrator

One should have a rounded edge, and goes on top. The other should have a beveled edge, and goes in the second grove.
TOOLS

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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
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1973 CB 350
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shinyribs

Re: Piston Rings

Administrator

In reply to this post by RodneyCB750K1979

The marking "TOP" on the rings is to tell you that it is the top of the ring that faces up.

And ditto Tools on the other. The reason for the beveled edge on the bottom ring is to act as an oil scraper. The bevel allows it to ''ride past'' the oil on the up stroke but scrape,or squeegee, the oil on the way back down.

Lucky 1

Re: Piston Rings

In reply to this post by RodneyCB750K1979

It means top of the ring not top position. Chrome ring usually goes on top position.

When you get them they are usually stacked in the right order in the package.

On a Roadstar Adventure.

RodneyCB750K1979

Re: Piston Rings

The seller of the new rings informed me the shiny ring goes in the top groove and the darker ring goes into the second groove. This is also the order they were packaged. Thanks a lot everyone for your comments. I just wanted to be sure.