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17 Posts
Discussion Starter #1
Hi All -
I have noticed on several occasions that my 650s has a high pitched sound generally lasting 30 seconds or so and the sounds occur when the bike has just been sitting in a warm garage or out in the sun. I notice this before the bike has been ridden.
I really don't think it's the fan kicking on (as it shouldn't from just sitting in warm weather).
It doesn't really sound electrical but is more of a release sound (like a valve releasing pressure).
Does anyone know what this might be?

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