Honda CBF -125 rattling engine noise after run with low oil.

[peti4000]

I have a Honda CBF-125 2010, and as I was riding home the other day it lost power for a second and then everything was normal again.
I was taking it very easy till I got home.
I regularly checked oil but obviously not correctly...
The gauge showed there was oil in it above min level.
Anyway, I got home on the bike but it started making a rattling noise.
Everything feels fine, got all the power same as before.
I changed oil anyway (just in case) and figured out there was only about 200ml oil in it instead of about 1.1litre.
Changed the oil and it feels all right but the noise is still there.
What should I do now? I was going for a very short few hundred meters run just to see if it goes away but it dont seem like.
Should I take to service? Or would it be okay just need to ride it to suck up the oil?
Any suggestions?

Thanks for help.

[RhynoCZ]

The engine head is probably fecked. That's the first thing to suffer from lack of oil. The noise won't go away, it'll become worse until the engine just stops. The camshaft and valve tappets/rockers are now worn beyond reasonable. It could also be the timing chain but I doubt it. Take the valve cover off and have a look inside.

Just out of my pure curiosity, how do you check the oil level?
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[peti4000]

Screw out the gauge then wipe it with clean cloth then put it back and then take it lut to check it.
The only thing I can think of is maybe stuck some oil on the gauge when I pulled it out?!
Anyway it seems like it will cost me a lot

[thx1138]

some useful info on here, and also the owners group on facebook

https://cbf125rider.wordpress.com/

[Riejufixing]

[peti4000]

Yes, the gauge is basicly a dipstick.
I have changed oil and the oil is clear no bits in it at all.
I can't always hear the noise, only when I gently accelerate.
But surely that noise wasnt there before.
I tried to listen where is it coming from but its quite difficult. I only hear it when I ride but surely its from the engine not from the exhaust.

[cb1rocket]

put your hand on the engine from cold before it warms up. if a knocking feel can be felt at the bottom then big end has gone
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[misscrabstick]

I would expect thhe big end to die first in the event of low oil tbh.

[doggone]

So long as it was managing to pump oil intermittently you might get away with it, there is a certain syndrome where you think you hear an odd noise then can't stop listening for it....

I would have expected the oil light warning to come on or flicker before serious damage occurred, assuming it's working.
That is what it's there for.

[peti4000]

There is no oil light on CBF-125. Only EML but it wast on.

[peti4000]

The noise is there for sure. Its quite loud metallic rattle. I thought about just hearing things but unfortunaltely Im not. For it makes a rattling noise.

[ThunderGuts]

Do you check the oil with the bike on the side or centre stand (pretty sure it's got both)? I would imagine that it's calibrated for checking on the centre stand (or at least, with the bike upright), if the dipstick is on the left side of the bike then it'd then give a false reading as the oil would pool on the left side of the engine?
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[noobRider]

Are you sure it's not just a loose chain on the sprockets? Unrelated to the oil issue but your chain might need adjusting
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[peti4000]

Ok guys im not stupid even tho it sounds like Sadly I know quite a lot about bikes to make a silly mistake like this.
Of course i measure oil level on centre stand and I checked chain its not loose.
Thanks for trying to help me anyway, I appriciate any comments.

[Riejufixing]

[ThunderGuts]

[peti4000]

My friend said the same as many of you guys here.
Most likely big end has gone.
Would it worth fixing it?
Could be more expensive than the bike itself isn't it?

I also cinsidered swap the engine to a good one.
But how can I sort out paperwork then?
I want it to be legal.
If I replace engine then obviously the engine number wont match to the one is in the log book.

Any ideas what to do?

Thanks guys!!

[cb1rocket]

[-]

Only 200ml before you noticed, when it should have 1100ml? It's fecked. New engine time.

You learn from mistakes. Next time, check the oil more than every decade and do it properly.
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[bikenut]

If the engine is now dead ( you killed it ) then there is no problem taking the thing apart for examination/experience/possible fix up ?

See cmsnl for the exploded views which can only help. You have a manual and only need a few "special tools" to take this engine apart ( and re assemble it ) , see cmsnl for help.
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[peti4000]

[MxMikey12]

I have the same problem and believe this is the reason why, any thoughts please?

https://www.bikechatforums.com/viewtopic.php?t=319796
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[Evil Hans]

[BusterGonads]