The motorcycle comes with a subtle tone after 4,000 rpm. - KTM Duke 390 Forum
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post #1 of 11 Old 08-30-2019, 01:53 PM Thread Starter
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Lightbulb The motorcycle comes with a subtle tone after 4,000 rpm.

Hello there,

I've asked before, but I tightened the screws and the same problem started again after changing the oil.

I'm sharing the video with you.

When it rises from 3000 rpm to 4000 rpm, a buzzing sound is heard, and when it falls from 5000 rpm to 4000 rpm, it sounds the same.

This is not a compressor sound, but a very subtle sound that comes with the compressor sound.

They said the problem was loose screws and they tightened the screws, but after a while the problem persisted.

A chronic problem? Or does that mean the motorcycle has a mechanical problem?

I tightened the screw in the picture, but the problem continues.

No sound when engine is cold. But when it warms up, it makes a sound.

The air filter is so dirty, I didn't change it. Does this make a sound?

Help me find the problem.
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post #2 of 11 Old 08-30-2019, 01:56 PM Thread Starter
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Video Link (Watch this important video, because the sound is here.)
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post #3 of 11 Old 08-30-2019, 01:57 PM Thread Starter
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www(.)yourfilelink(.)com/get(.)php?fid=2133067

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post #4 of 11 Old 08-30-2019, 02:44 PM Thread Starter
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Vimeo Link

vimeo.com/356941461
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post #5 of 11 Old 08-30-2019, 03:24 PM
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If the air filter is so dirty, you should at least replace it. No sense starving your engine of clean, filtered air.
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post #6 of 11 Old 08-30-2019, 03:28 PM
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After watching your video, the engine sounds really dry, or starved of oil!!! Not saying that is true but it sounds horribly noisy out of the speakers of my iPad. Hope you get it sorted
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post #7 of 11 Old 08-30-2019, 03:40 PM Thread Starter
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Quote:
Originally Posted by Whyzee View Post
If the air filter is so dirty, you should at least replace it. No sense starving your engine of clean, filtered air.
I'm going to change it, but does it affect that voice?
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post #8 of 11 Old 08-30-2019, 03:45 PM Thread Starter
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Quote:
Originally Posted by Whyzee View Post
After watching your video, the engine sounds really dry, or starved of oil!!! Not saying that is true but it sounds horribly noisy out of the speakers of my iPad. Hope you get it sorted
I just changed your oil. The oil gauge is working.

But after changing the oil, the sound started again after 200 km. But I also did the chassis screw tightening. I just can't say it's the problem.
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post #9 of 11 Old 08-30-2019, 04:44 PM
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You changed my oil?!? I call BS.

Keep looking for loose screws or fasteners is my guess.

Do you have the proper amount of oil in the engine?
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post #10 of 11 Old 08-30-2019, 07:59 PM
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I would check all the bolts associated with the exhaust system.
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