UK Monster Owners Club Forum » .: Technical :. » Engines, Clutch, Gears » Monster 1200 R 'sighing' periodically'!

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Old 09-06-2019, 01:59 AM   #1
Khanivore
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Monster 1200 R 'sighing' periodically'!

My bike periodically 'sighs'! It happens even if I haven't ridden it for several days and comes from the fuel filler cap area. What's causing it and is it a problem? Video of the noise, caught just after it started, here:

https://youtu.be/PPv7a1nv1Po
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Old 09-06-2019, 06:23 AM   #2
slob
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Blocked breather pipe perhaps?
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Old 09-06-2019, 10:51 AM   #3
mickj
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It's probably the overpressure in the tank being released, quite common on warm days as the petrol gets warm and expands, nothing to worry about
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