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  #11  
Old 19th September 2013
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Quote:
Originally Posted by Hexlobular View Post
If he's got the same issue as in the vid, I don't think it's a venting noise. Sounds electrical to me, as if the pump is trying to prime itself all the time.
I'll have to check out the video later, I'm at work and can't view it (software restrictions..yeah) - just threw out an idea. I had a whistling issue once but it was only during driving. It turned out to be the slotted mirrors, at a certain speed they'd create a 'whistle' when the wind blew through them. I know that isn't the OP's issue though, just telling the story
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  #12  
Old 19th September 2013
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Quote:
Originally Posted by Hexlobular View Post
If he's got the same issue as in the vid, I don't think it's a venting noise. Sounds electrical to me, as if the pump is trying to prime itself all the time.
I know the sound, in the video, kind of sounds like the bike is continually priming itself but it's not the priming sound its a whistle sound. More like the sqeaking sounds brakes make when you need to change them. The priming sound has a distintly different sound to it..
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  #13  
Old 19th September 2013
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Actually, I should modify my statement, I re-played the video and the initial priming sound does sound the same as the continous squealing/whistle.. However, that's not my usual priming sound I get on a cool morning..

If you watch this second video http://youtu.be/6nNDlgdBH7U and you can hear the difference of the distinctly different usual priming sound..

Somehow related to the heat, on the hot days, when the bike has been sitting in the sun and I go to start it up, I get the whistle/squeal sound which may be the continuos priming sound but not the usual priming sound, if you follow..
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  #14  
Old 19th September 2013
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Again, does it do it with the gas cap off?
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  #15  
Old 19th September 2013
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Quote:
Originally Posted by Hexlobular View Post
Again, does it do it with the gas cap off?
Ill have to check that after it warms up more here.. That's not something I experimented with the last time it happened..
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Old 19th September 2013
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Perhaps unlikely, but you may want to check your battery and your battery wire connections and all the grounds, just to make sure it's not just some funky low-voltage issue. Those ar easy to rule out, so might as well give it a look.
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  #17  
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Quote:
Originally Posted by Hexlobular View Post
Perhaps unlikely, but you may want to check your battery and your battery wire connections and all the grounds, just to make sure it's not just some funky low-voltage issue. Those ar easy to rule out, so might as well give it a look.
Alright, cool thanks. Ill check that first.
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  #18  
Old 19th September 2013
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It's normal. The noise is coming from the fuel pressure regulator. Mine does the same if I park it in sun on a hot day. I put a towel over the tank when I need to park in the sun for any length of time and no more noise.
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  #19  
Old 20th September 2013
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Oh ok. Yeah I thought it was strange that my two completely different bikes were doing the same exact thing but under the same conditions. I'm just surprised I didn't find more peaople talking about it. I guess most people keep their bikes out the direct sun. I'll do the same. Thanks!!
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  #20  
Old 20th July 2015
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my brand new 2015 iron does it. 3000 miles on bike right now. never noticed it till riding on days over 100 degress. been driving me nuts.
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