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June 26th, 2011, 11:42 PM   #1
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Loose seal between midpipe and FMF Q4 on 2009 FE570

Howdy folks,

My first post here! I'm the 2nd owner of a 2009 FE570 and the bike came with a few extras, including an FMF Q4 can. The bike only saw some light fire-road use and I've been riding some slow & technical twisties so I put some DEI heat tape on the bottom of the tank and wrapped the header from exhaust outlet to the upper heat shield (under the tank).

When I first pulled off the can, midpipe, and header to wrap the header I didn't pay much attention to the connection between the Q4 and the mid-pipe, but now that I've re-assembled the exhaust I notice that there's a slight gap at the mating between the Q4 and the mid-pipe (pictures below). Idling, I can feel a bit of exhaust coming out of the gap and a pretty significant "breeze" when blipping the throttle. I checked the stock muffler (which came in the FMF box when I purchased the bike) and there doesn't appear to be any graphite gasket between the muffler/midpipe like there is between the midpipe/header.

Now, I've tried fiddling around with loosening the midpipe mounting bolt, exhaust outlet bolts, and muffler bolts; regardless of what order I re-tighten them I end up with the same gap. It almost seems as if it's caused by the FMF being bent inward a bit on the hangers (definitely a possibility, **idea** I'll try mounting up the stocker and see if the same gap exists). I've attempted to close it slightly by adding a hose clamp, but it has had little to no effect. I can't imagine the gap is actually making a significant performance difference, but when riding on the street and wearing my Sidi Streetburner hi-top boots, I can feel the exhaust gases cooking my right heel.

TL;DR: slight gap between Q4 and midpipe (see pics), doesn't appear to be a gasket between them stock

My questions to you folks:
Does anyone else have a gap such as this on their setup?
Any suggestions for a remedy? Any gaskets small enough to fill that space?

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June 27th, 2011, 01:16 AM   #2
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Re: Loose seal between midpipe and FMF Q4 on 2009 FE570

hi temp rtv silicone
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June 27th, 2011, 10:36 AM   #3
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Re: Loose seal between midpipe and FMF Q4 on 2009 FE570

Originally Posted by berglsmerg
hi temp rtv silicone
Ditto!
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June 27th, 2011, 10:56 AM   #4
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Re: Loose seal between midpipe and FMF Q4 on 2009 FE570

Thanks guys! Don't know why I didn't think of that myself; pretty sure I have a tube lying in the spare parts drawer.
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June 27th, 2011, 06:41 PM   #5
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Re: Loose seal between midpipe and FMF Q4 on 2009 FE570

All slip-on type fitting need a light high temp RTV to get a good seal (black permatex works good). Let it cure for 24 hours before starting. Even the best pipes usually need a coating to seal 100%.
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