KPX250 Whistling/Ringing Noise

rdawg · 09-04-2024, 06:12 PM

Hello all,

I recently got my first motorcycle, a Lifan KPX250, and have put about 300 miles on it. Since a couple days ago, I started hearing a very high pitch noise, and I was hoping someone had an idea of the cause.

The noise starts after a few minutes of riding, but is only present at speeds above about 11 MPH. Letting off the throttle doesn't directly affect the noise, and neither does breaking. The only thing that seems to be affecting the pitch of the sound is the speed of the bike.

The noise sounds very close to what can be heard in the first 3 seconds of this YouTube video, but I already ruled out the gas cap as a cause:

One last thing, I have not noticed any change in the performance of the bike since hearing the noise.

If anyone has any idea what is causing this noise, I would really appreciate the help as I am still new to riding and working on bikes. Thanks!

09-04-2024, 06:12 PM	#1
rdawg Join Date: Jun 2024 Posts: 1	KPX250 Whistling/Ringing Noise Hello all, I recently got my first motorcycle, a Lifan KPX250, and have put about 300 miles on it. Since a couple days ago, I started hearing a very high pitch noise, and I was hoping someone had an idea of the cause. The noise starts after a few minutes of riding, but is only present at speeds above about 11 MPH. Letting off the throttle doesn't directly affect the noise, and neither does breaking. The only thing that seems to be affecting the pitch of the sound is the speed of the bike. The noise sounds very close to what can be heard in the first 3 seconds of this YouTube video, but I already ruled out the gas cap as a cause: One last thing, I have not noticed any change in the performance of the bike since hearing the noise. If anyone has any idea what is causing this noise, I would really appreciate the help as I am still new to riding and working on bikes. Thanks!
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