Noise from engine head when accelarating past 6k rpm

982 Views 18 Replies 5 Participants Last post by Big Cahuna, 9 mo ago

Shubham Negi

Discussion Starter · 9 mo ago

So i got a 2013 CBR250r with 52000kms. Recently changed both camshafts and rocker arms, also adjusted the valve clearance. But soon after, this problem arises. Whenever i go past 6k rpm, a metal ticking noise comes which is pretty loud and it goes like Trrrrrrrr. This noise feels like its coming from right under the fuel tank( Where the head is located). It stays there as long as i am above 6k and vanishes as soon as i go below 6k rpm. It happens only when the bike is moving and so i cant really make a video of it. I have searched everywhere on internet but cant find a similar thread. Can anyone help?

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DannoXYZ

· #2 · 9 mo ago

Hi, why did cams & rockers need replacing?
I would check valve-clearances again.
There's certain amount of wear at break-in and may require follow-up adjustment.

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DannoXYZ

· #9 · 9 mo ago

Do you have photo of old camshaft?

I wonder if it's possible to grind down cam-lobes to cause grooves without causing damage to cam bearing journals as well as cam-bearing surfaces?

Seems like this would be lubrication problem, not mileage without valve-adjustment issue. Riding for 25k km without checking valve-clearance would not cause grooves in cam-lobes.

Find different mechanic and show them receipt from 1st mechanic and ask them to verify work done. And also troubleshoot noise. They may or may not be related.

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DannoXYZ

· #15 · 9 mo ago

Shubham Negi said:
Is it possible that the old mechanic didnt set the timing correctly? Also what could be the cause of lack of lubrication? Could it be because i use 10w40?

No, out of time cam would difficulty starting, unstable idle and issues across entire rev-range. But it would not cause any lubrication problems.

Using wrong oil would cause engine to wear out at 200k-km instead of 400k-km. Would not cause immediate failure.

I bet mechanic installed oil-filtre backwards. Then realised mistake on test-drive and re-did filtre and orientation properly. But damage had already been done.

Take it to different mechanic for inspection.

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