CG125 Oil Change issue

[Matt371]

Hey everyone,

I just changed the oil on my CG125 for the first time and made a complete rookie error, I assume I tightened the bolt back on too tight and a metal ring popped off from around the bolt.
It not a washer, at least doesn't look like one I'm just concerned wether
it was in place to keep everything tidy or I'm about to dump engine oil down the road and seize up.

Any advice would great, i'll post a pic of where the ring came off, you can see the black lip near where the bolt meets.

[unitynotsocri...]

You should replace it .Its the gauze oil filter cover,not the drain plug which is underneath the engine. If you change the oil using this and not the bolt then all the dwarf n crud builds up inside......knackering your new oil in five hundred miles.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[Matt371]

The bolt in the picture is under the engine, below the gear selector, every guide I have seen/read suggests that this is correct bolt to remove and contains a spring and a filter similar to a large thimble.

[unitynotsocri...]

Look under under the engine, there should be another bolt at the lowest point.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[Matt371]

I found an image that shows what you mean, it is not present on my bike from a brief search apparently the other bolt is only present on certain models and if not you need to use the bolt shown in the picture I posted.

I will try to find a replacement for the ring that popped off though. Im assuming theres no way I can replace it without losing the new oil.

[Matt371]

Took some photos of the ring that came off, any idea of a name for what I'm looking for?

EDIT: Looking at the shape and that it would be covering a rubber o-ring would it potentially be there to hold the o-ring securely?