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Offline NorseForce

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  • Town / City: Denver
  • Country: us
High Pitched Noise(whine) From Gas Cap
on: April 26, 2020, 09:48:34 PM
Hello.  I just picked up a 2020 ZR900FLF. I took it for a ride around town for about 25 miles and when I got back to my garage and turned the bike off there was a high pitched noise or whine coming from the gas cap. I opened the cap and alot of air / gas fumes came out. Its not hot today about 75 deg F.  About an hour later I checked on it and it was doing it again. Is there some sort of release valve for the gas tank that may not have been properly installed by the dealer? Do I have a defective gas cap? Or is this just something I will have to live with. What if I ride when its over 100 deg F, should I worry about the cap failing due to tank pressure?

Offline Cazzy_R

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Re: High Pitched Noise(whine) From Gas Cap
Reply #1 on: April 26, 2020, 09:53:23 PM
 It's fine. They all do it. NEXT!  :400:
Cazzy_R

Tighten it 'til it strips then back it off half a turn.

Offline Frontline

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Re: High Pitched Noise(whine) From Gas Cap
Reply #2 on: April 26, 2020, 10:30:15 PM
Like Cazz said, its normal.

Whats actually going on is the gas in tank gives off fumes when sitting out in the sun and the noise you hear is the air bleeding off from pressure. Its not a completely open vent but one that works under a small amount of pressure build up.

Offline stuartho

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Re: High Pitched Noise(whine) From Gas Cap
Reply #3 on: April 27, 2020, 02:00:45 AM
Welcome to the wonderful world of Z900 idiosyncrasies.

This forum will be very helpful.

Offline iBuchon

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Re: High Pitched Noise(whine) From Gas Cap
Reply #4 on: April 27, 2020, 05:04:55 AM
My wife was very concerned about her 650 making noises when she walked up to it in the parking lot after work.  :008:

Offline jjjjjjay

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  • Town / City: Clarksville
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Re: High Pitched Noise(whine) From Gas Cap
Reply #5 on: May 30, 2020, 11:03:53 PM
Man, the forum has been helping me a lot today. Thanks, dudes...