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April 14th, 2016, 02:49 AM   #1
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I Ride: '12 FE390
70 degree noise

Hi guys.
My 2012 390 is making a strange metallic rattle when shutting the throttle.
I've uploaded a short clip to YouTube
Notice as I rev the bike and let the throttle go it does it.
Sounds normal at idle to me though.
Any thoughts appreciated.
115hrs on bike..

Or am I hearing things?
Thanks from Lonners

Last edited by sico; April 14th, 2016 at 02:54 AM.
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April 14th, 2016, 02:54 AM   #2
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I Ride: 7 Husabergs two FE570S,FS570 FE390/450,07 FE650,05 FE550,2 Husqvarna's 86 WR400,87 510,09 Buell
I'd check cam chain tension first
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April 14th, 2016, 03:21 AM   #3
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Yeah, I thought loose cam chain. It's got a dirt tricks tensioner in it though.
I removed it and layed bike over then re installed before I took this footage.
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April 14th, 2016, 07:46 AM   #4
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That sounded weird on my phone. Id check valves as well as air leaks from the top and out.
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April 14th, 2016, 01:16 PM   #5
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I know there is a leak in exhaust header where it joins the mid pipe. I could try re sealing that..
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April 17th, 2016, 11:10 PM   #6
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Pulled bike half apart to remove exhaust. It appears with the Akropovic header there is no room to run the graphite o ring sleeve type gasket at the join to the mid pipe.
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April 18th, 2016, 04:47 AM   #7
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Loctite gasket seal. Let it dry for a Day or two before u run it hot.
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April 18th, 2016, 10:26 AM   #8
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Just a guess but maybe you have a crack in your exhaust somewhere?

Last edited by Rainerio; April 19th, 2016 at 12:14 PM.
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April 19th, 2016, 11:17 AM   #9
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Removed entire pipe off bike for the first time so got a close look, all seems fine.
I may install the standard header for now, looks unused to me. But if I do decide to keep the Akropovic header on I'll use some type of gasket sealing compound.
For my interest while this was all off I weighed the exhaust components, the Akropovic header saves 150g and the muffler around 850g so 1kg all up.
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April 19th, 2016, 12:19 PM   #10
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If you have the stock exhaust muffler put it on and see if that noise changes?
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