[tooseevee]

somewhat ringing noise...but it disappears at high acceleration. In my case ,most prominent at around 20 km/hr.

         You'll have to excuse me if I just don't get it.

          I'd suspect a vibrating piece of sheet metal or similar before I'd suspect ringing valve guides.

           Stay above 12 mph & ride the damn thing. It's an engine. It's going to make noises.

           Do you hear this ringing with the bike on the centerstand in 1st gear at 12 mph?

            If you do, you can listen with a long screwdriver stuck in your ear.

[SteveThackery]

Nice one, AzCal!  That's one of the best piss-takes I've read in a long time. 😄

I think this whole story is bullshit. Nobody even knows what valve guides sound like, and the OP doesn't even know if the noise he can hear IS the valve guides anyway!

This is a troll thread, and I recommend we let it die a rapid death.

[SteveThackery]

By the way, I think I'm one of the few people on the planet who DOES actually know what a valve guide sounds like, and it's nothing like anything discussed thus far.

Back in the 1970s I owned one of the worst bikes ever made by the British motorcycle industry, and that's saying something.

It was an AJS 250; a single cylinder piece of junk. It had a user-adjustable oil feed to the inlet valve guide, and this was described in the owner's handbook.

It comprised a screw and locknut. The adjustment was as follows (and this is the honest truth): loosen the locknut, turn the screw inwards until it bottoms, and then..... wait for it..... unscrew it by the smallest perceptible amount.  Then tighten the locknut.

Somebody at AJS thought "smallest perceptible amount" was actually a helpful description.  Unbelievable!

But it didn't finish there. The next step was to ride the bike, and this is what the handbook said: if the inlet valve was heard to squeak, open the screw a little more (a slightly larger smallest perceptible amount, presumably), and if the engine made blue smoke, screw it in because your smallest perceptible amount was too perceptible.

Anyway, I adjusted mine and it did, indeed, squeak.  I tweaked it until it didn't.

So that is the story of how I heard what an inadequately lubricated inlet valve guide sounds like: a rapid squeak-squeak-squeak at the same frequency as the exhaust beats.

Definitely not a ringing.

[AzCal Retred]

@ #16: Thanks. I thought "evanescent wave exponentially attenuating" was kinda poetical. "If you can't dazzle 'em with footwork, baffle 'em with bullshit".

[tooseevee]

@ #16: Thanks. I thought "evanescent wave exponentially attenuating" was kinda poetical. "If you can't dazzle 'em with footwork, baffle 'em with bullshit".

     Somehow I had a feeling....               

[Adrian II]

@ SteveThackery, they could have specified seven fifty-ninths of a turn, surely?

A close relative of barely perceptible amounts...

https://www.youtube.com/watch?v=voEo8XGK4ZI

A.

[ssg]

This is hard to imagine what a "somewhat ringing" noise sounds like.

How do you know it's the valve guides?

Check the sound here....https://www.youtube.com/watch?v=GUrOIk7Fkq0

When guides worn the valves are no longer tighly attached and their slight movement brings this noice when accelerated.

[tooseevee]

A close relative of barely perceptible amounts...

https://www.youtube.com/watch?v=voEo8XGK4ZI

A.

     I can't imagine the incredible patience that stop-motion people have.

      Although I DID spend 4 years on a total, piece by piece restoration of one car.

[SteveThackery]

Check the sound here....https://www.youtube.com/watch?v=GUrOIk7Fkq0

When guides worn the valves are no longer tighly attached and their slight movement brings this noice when accelerated.

It's a 10 minute video and it's monetised with a long advert at the front.  I'm not watching it.

This is clickbait and trolling.  Goodbye.

[axman88]

Check the sound here....

When guides worn the valves are no longer tighly attached and their slight movement brings this noice when accelerated.

When posting links where you want to point out something specific, like a certain sound, it's wise to use UTube's "Copy Video URL at Current Time" feature.    Like this:
https://youtu.be/GUrOIk7Fkq0?t=473

Your readers will still have to watch the commercial at the beginning, (almost every UTube video I see nowadays seems to have ads) but the video will start at the precise moment you want to bring attention to.

I assume that was the moment you wanted us to hear, where we get to compare the Before and After of the head repair.  There is certainly a lot less valve noise after the repair.

Here we see the moment where the worn guides are revealed.  https://youtu.be/GUrOIk7Fkq0?t=215

We see that the valves are being replaced, and NCR Moto shares with us the part number on the box the spares arrived in, but we don't see the guides being replaced.  Does the video dialogue claim that the guides are also being replaced?  It would have been nice if they showed us how they do the process.

I've seen NCR Motorcycle's content before, and some of it seems quite helpful and technical.  I also like Monu Sagar's content.  The problem with both channels, for me, are that they are presented in Hindi.

I get the impression that YOU can understand Hindi.  Maybe you would be willing to translate some of the key dialogue for us, going forward, not only in this but in other videos?

[SteveThackery]

For what it's worth, I don't deny that valve guides wear.  Of course they do. And I've also described how they squeak if under-lubricated.

What I don't buy is the "sort of ringing" description, and I don't buy that you can shut them up by mixing engine oil in with the petrol.  In fact, even if you could it would be a really bad idea.  You do not want engine oil getting into the combustion chamber because it can cause whiskering of the spark plug and it leaves extremely hard carbon deposits behind. The rings can jam up, and gas blows by.

If you insist on putting oil in the petrol, then at least make it two-stroke oil, because it is formulated to leave much softer deposits which are largely self-clearing.

But I still don't believe you can, or should, treat worn valve guides by putting oil in the fuel.

[AzCal Retred]

Maybe tap the guide and install a set screw with a bronze rubbing pad on the tip? You could reach in through the coils with your allen wrench and tighten it up a barely perceptible amount until the offending ringing went away. Engine off, of course...