2019 Lifan X-pect noise

CaseysTech · 06-14-2020, 02:25 PM

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Jsalmi · 06-15-2020, 06:55 AM

Hello fellow Floridian, my X-pect has same noise if you' re referring to the gurgle (for lack of a better term). Sounds like intake noise that resonates at different levels at various rpms. Maybe the noise is even amplified inside the air filter box. Where about in FL are you? I'm in West Palm Beach

CaseysTech · 06-15-2020, 02:12 PM

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culcune · 06-15-2020, 03:51 PM

Look at the last post in this thread and see if you can move the tube in your tank.

http://chinariders.net/showthread.php?t=26591

Jsalmi · 06-16-2020, 04:05 AM

Ohh that noise... higher pitch fast vibration. Had that one too, and read replies here about tube inside the gas tank. Took a long screwdriver to move it gently to the left, its slightly back from the filler neck on the left side. Got rid of the noise

CaseysTech · 06-16-2020, 01:41 PM

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CaseysTech · 06-16-2020, 03:21 PM

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CaseysTech · 06-16-2020, 08:42 PM

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culcune · 06-16-2020, 11:20 PM

Quote:

Originally Posted by CaseysTech

OK I have checked valves for the 3rd time changed oil again. It is still there at 5k and up and only on throttle . It goes away as soon as I let any off the throttle.Everything is tight as far as I know. I had a Hawk 250 and had nothing like this. Bike has just over 200 miles.

Contact American Lifan and/or your dealer for diagnosis and warranty details.

bored stiff · 06-17-2020, 05:39 AM

ya I have the same noise, drives me nuts,You are right that it is only heard under load at higher rpm, ALMOST KILLED MYSELF TRYING DRIVE AND LOCATE, not good.Engine runs smooth,maybe in the gearbox. If anyone can run one of theses on a lift might be able to find it.Lets all keep on it, until together, we rid our society of this scourge! Or give up and accept it.

CaseysTech · 06-24-2020, 02:50 PM

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CaseysTech · 06-24-2020, 03:03 PM

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bored stiff · 06-25-2020, 05:38 AM

I havent had time to address this on mine yet, but I will give it my full attention this weekend. My next step I was thinking of trying was lifting tank and placing foam tightly under tank to see if it deadens or changes the sound. this I think could at least confirm or rule out the tank as the source.

CaseysTech · 07-02-2020, 08:24 AM

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krat · 07-02-2020, 10:06 AM

I suspect chain tension is the problem. Your chain is slapping something when you are under load at specific RPM. it could be inside the front sprocket case or along the drive line.

Chain tension changes with load and speed and varies constantly while in operation.

06-14-2020, 02:25 PM	#1
CaseysTech Join Date: Aug 2018 Location: Florida Posts: 15	2019 Lifan X-pect noise () Last edited by CaseysTech; 07-05-2020 at 09:33 AM.
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06-15-2020, 02:12 PM	#3
CaseysTech Join Date: Aug 2018 Location: Florida Posts: 15	() Last edited by CaseysTech; 07-05-2020 at 09:33 AM.
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06-15-2020, 03:51 PM	#4
culcune Join Date: May 2006 Location: Yuma, Arizona Posts: 9,035	Look at the last post in this thread and see if you can move the tube in your tank. http://chinariders.net/showthread.php?t=26591 __________________ "They say that life's a carousel, spinning fast you got to ride it well..." TGB Delivery Scooter 150 TMEC 200 Enduro--carcass is sadly rotting in the backyard
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06-16-2020, 01:41 PM	#6
CaseysTech Join Date: Aug 2018 Location: Florida Posts: 15	(). Last edited by CaseysTech; 07-05-2020 at 09:33 AM.
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06-16-2020, 03:21 PM	#7
CaseysTech Join Date: Aug 2018 Location: Florida Posts: 15	() Last edited by CaseysTech; 07-05-2020 at 09:34 AM.
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06-15-2020, 06:55 AM	#2
Jsalmi Join Date: Feb 2020 Location: S Florida Posts: 50	Hello fellow Floridian, my X-pect has same noise if you' re referring to the gurgle (for lack of a better term). Sounds like intake noise that resonates at different levels at various rpms. Maybe the noise is even amplified inside the air filter box. Where about in FL are you? I'm in West Palm Beach
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06-16-2020, 04:05 AM	#5
Jsalmi Join Date: Feb 2020 Location: S Florida Posts: 50	Ohh that noise... higher pitch fast vibration. Had that one too, and read replies here about tube inside the gas tank. Took a long screwdriver to move it gently to the left, its slightly back from the filler neck on the left side. Got rid of the noise
	0

06-16-2020, 08:42 PM	#8
CaseysTech Join Date: Aug 2018 Location: Florida Posts: 15	() Last edited by CaseysTech; 07-05-2020 at 09:34 AM.
	1

06-17-2020, 05:39 AM	#10
bored stiff Join Date: Jan 2020 Location: New York Posts: 53	ya I have the same noise, drives me nuts,You are right that it is only heard under load at higher rpm, ALMOST KILLED MYSELF TRYING DRIVE AND LOCATE, not good.Engine runs smooth,maybe in the gearbox. If anyone can run one of theses on a lift might be able to find it.Lets all keep on it, until together, we rid our society of this scourge! Or give up and accept it.
	2

06-24-2020, 02:50 PM	#11
CaseysTech Join Date: Aug 2018 Location: Florida Posts: 15	() Last edited by CaseysTech; 07-05-2020 at 09:34 AM.
	1

06-24-2020, 03:03 PM	#12
CaseysTech Join Date: Aug 2018 Location: Florida Posts: 15	() Last edited by CaseysTech; 07-05-2020 at 09:34 AM.
	1

06-25-2020, 05:38 AM	#13
bored stiff Join Date: Jan 2020 Location: New York Posts: 53	I havent had time to address this on mine yet, but I will give it my full attention this weekend. My next step I was thinking of trying was lifting tank and placing foam tightly under tank to see if it deadens or changes the sound. this I think could at least confirm or rule out the tank as the source.
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07-02-2020, 08:24 AM	#14
CaseysTech Join Date: Aug 2018 Location: Florida Posts: 15	() Last edited by CaseysTech; 07-05-2020 at 09:34 AM.
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07-02-2020, 10:06 AM	#15
krat Join Date: Nov 2019 Location: KY Posts: 260	I suspect chain tension is the problem. Your chain is slapping something when you are under load at specific RPM. it could be inside the front sprocket case or along the drive line. Chain tension changes with load and speed and varies constantly while in operation. __________________ %90 of the Chinese motorbikes ever made are still on the road. The other %10 made it back home.
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