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sico April 14th, 2016 02:49 AM

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?

Rainerio April 14th, 2016 02:54 AM

I'd check cam chain tension first

sico April 14th, 2016 03:21 AM

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.

Palle April 14th, 2016 07:46 AM

That sounded weird on my phone. Id check valves as well as air leaks from the top and out.

sico April 14th, 2016 01:16 PM

I know there is a leak in exhaust header where it joins the mid pipe. I could try re sealing that..

sico April 17th, 2016 11:10 PM

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.

Palle April 18th, 2016 04:47 AM

Loctite gasket seal. Let it dry for a Day or two before u run it hot.

Rainerio April 18th, 2016 10:26 AM

Just a guess but maybe you have a crack in your exhaust somewhere?

sico April 19th, 2016 11:17 AM

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.

Rainerio April 19th, 2016 12:19 PM

If you have the stock exhaust muffler put it on and see if that noise changes?

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