Rattle @ 4000 rpm

[Tc-White]

Hi everyone, I'm new here and bought a 2017 xr with 13000km 2nd hand. When starting I have the 2 second hard rattling so thats the cam chain tensioner i think.

But when the engine is warm I have a loud rattle from 4000 rpm to 6000rpm. I don't have any rattle below 3000rpm. The first 100km (testride) when I bought the bike there was no problem. I'm very concerned now. It is not a ticking sound, but a loud rattle or vibration sound . Anyone who recognizes this? greetings TC-White

[smithy]

Originally Posted by Tc-White

Hi everyone, I'm new here and bought a 2016 xr with 13000km 2nd hand. When starting I have the 2 second hard rattling so thats the cam chain tensioner i think.

But when the engine is warm I have a loud rattle from 4000 rpm to 6000rpm. I don't have any rattle below 3000rpm. The first 100km (testride) when I bought the bike there was no problem. I'm very concerned now. It is not a ticking sound, but a loud rattle or vibration sound . Anyone who recognizes this? greetings TC-White

Could be the dreaded rocker/cam issue.

Lord Knobrot

[Salish1000]

Bike sounds are worse than assessments of music or ladies. No two people see things quite the same way. A video is about your best option for getting help with diagnosis. One trick, if you haven't done it, is to take a long handled screw driver and place the metal end on the engine in spots, and place the plastic handle against your skull near the eardrum. It transfers lower frequency sound and vibration and can offer clues as to where and what something is.

[af1-windy]

Mirror glass...   

[Tc-White]

It only happens after an hour + of driving when the engine is Hot. No problem before. The noise goes away at higher /Lower revs - 30000 + 5000rpm. Oil magnet checked. No iron to be seen . When the engine has cooled down, there is no rattling anymore @ 4000rpm.

video on you tube,

   

[Salish1000]

That's helpful. There are moments in that video when I hear a sound I don't hear on my 16. Like a low frequency rattle. I don't hear at the end, and the audio has some exhaust and wind noise that drown out the engine a bit, but earlier I hear something mechanical that is repetitively rattling. I would try my suggestion of the screw driver method. If you feel it in your skull inside the engine, that tells you something. That it's happening only when hot and at certain RPM is curious. My 16 has about 16,500 miles on it now, and no sound like this. Keep us posted and good luck with someone else here having a better idea of what that is. My guess now would be pure speculation of valves and cam chain and cams and the like.

[Tc-White]

That sound at the end is the engine! Not the exhaust or the wind. This happens at 4000rpm when hot. The same sound goes away at 5000rpm or below 3000rpm.

[Salish1000]

Originally Posted by Tc-White

That sound at the end is the engine! Not the exhaust or the wind. This happens at 4000rpm when hot. The same sound goes away at 5000rpm or below 3000rpm.

Gotcha. There is a sound at 14-17 seconds at lower RPM that is odd, and then you rev it up and there is a higher pitch version of that sound. I've still got nothing more specific for you than to say my 16 doesn't sound like that. I'm sure you've researched the before mentioned cam issue. Lots of videos of how that sounds that I don't recall, since I don't have that problem, yet

[Antares]

Originally Posted by Tc-White

It only happens after an hour + of driving when the engine is Hot. No problem before. The noise goes away at higher /Lower revs - 30000 + 5000rpm. Oil magnet checked. No iron to be seen . When the engine has cooled down, there is no rattling anymore @ 4000rpm.

video on you tube,

Sounds like mirror glass to me. Not a joke.

When the cam chain is loose it's an on and off rattle. like nothing above 4k, rattle below. ~4k is the resonant frequency of the bike so vibrations around there are more than likely body pieces not engine related. actual Camshaft issue would show at any RPM

[Tc-White]

I ordered new oil castrol 5W40 , and manual cam chain tensioner. The rattling at the start should then be gone.

It's definitely not the mirror glass. I hand held these and no change in sound/rattle.