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Piston ring

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watty51:
Hi all,
Was trying to find out some information about the top piston ring from a Cb350f.

The oil ring and the 2nd (middle ring) have a T stamped on them, but the top ring has no T stamped.

One thing I noticed was there is a slight raised edge on this ring.

Should there be this raised edge ?

If so does it matter which way the ring goes, when reinstalled. Did take photos but lost them on my phone.

Top 2 rings in photo 1 have a T stamped on them, but the ring on its own has no stamp.
Photo 2 showing the edge on top ring.

Thanks
Mark

K2-K6:
Look at the top of the piston,  the crown often has it's edge smaller diameter than the skirt (next "ledge" down) which accommodates the upturned ring cross section. 

Ordinarily the lip  then is oriented upwards as it promotes the ring sealing against the bore under compression to create a semi dynamic one way sealing effect with the compression acting directly onto the ring itself to push it outward.

Ooh,  that's a long sentence that I can't readily see how to punctuate  ;D

Nurse Julie:
This is the orientation of the top ring. Top is facing upwards.

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Nurse Julie:
And here is an exploded view of the end of the ring. Once again, facing upwards.

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Nurse Julie:
If they are oversize rings, the size markings will be on the top ring and this should face upwards.

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