Termignoni backfiring/popping

[weas]

I recently bought a 2007 S2R 1000 w/ 3,400 miles on it. It came with full Termignoni exhaust, which I have recently noticed popping a lot when I let off the throttle. Whether it has been doing this since I got it or not, I'm not really sure -- but I just started noticing it (I've put ~200mi on the bike, would be more but I haven't changed the belts yet). While the popping doesn't really bother me, I wanted to know whether it was normal or not. In my experience with cars, the times I've dealt with a lot of backfiring is when I cracked a header/exhaust/bad seal; although I see no damage on the exhaust, could this have something to do with it? Again, I have no problem with the backfire, just wanted to make sure it was normal.

Thanks in advance.

[YellowDuck]

Afterfiring/Popping is usually caused by a lean fuel condition.

If the Termis were added without flash/adjustment to the fueling system (curve, trim, etc.) that needs to be done.

[ducpainter]

Popping on decel can also be caused by an exhaust leak.

If the bike runs well otherwise I would check.

[weas]

The exhaust was dealer installed, and I was told the ECU was set for it; I have the receipt.

The bike runs very well, I'm in love with it. I'll check for an exhaust leak here in a few. Thanks.

[EEL]

I'm almost positive this is an exhaust leak issue. I had the same problem. Turned out the gasket between the header pipe and the head was completely blown out. I replaced and all was well again.

I couldnt event feel the exhaust leak but once I removed and inspected, I saw exhaust soot on the inside flange indicative of a leak.

[Slide Panda]

+1 to checking for an exhaust leak. It doesn't need to be anything grand either. My former 620 had high-mouts and the connection at one of the riser s-pipes had just come a touch loose - which resulted in popping on decel. I loosened the joints, wiggled them about a bit, tightened it back up and the problem was solved.

[weas]

Okay, so I went out to check the exhaust and 5 seconds later it was immediately clear where the leak was:



Turned the bike on and it's just blasting exhaust.   Now my question is, what fell out and where can I buy it?  

[WetDuc]

The dealer should have that plug.  Its a BSP thread bolt. 
Funny, my S2R1000 did the exact same thing and that plug fell out.   I replaced it with the old one from the cat converter.

[weas]

The dealer should have that plug.  Its a BSP thread bolt. 
Funny, my S2R1000 did the exact same thing and that plug fell out.   I replaced it with the old one from the cat converter.

There's no dealer in Arkansas, so I'll call Dallas tomorrow. Thanks, glad to know it's just a plug and not something bigger.

[talljoker]

I have the same issue but I think I like it...my friends say when I downshift to pass I put out flames...

[Howie]

I don't remember the size, but
http://www.mcmaster.com/#brass-pipe-fittings-and-pipe/=e9n4m6
or a local plumbing supply store.  The thread is a British Standard Pipe Thread.  You have one in the other pipe for them to match.

[EEL]

I have the same issue but I think I like it...my friends say when I downshift to pass I put out flames...

Tell us how much you like it when you have to pull your head to replace your burnt exhaust valve.

[weas]

I don't remember the size, but
http://www.mcmaster.com/#brass-pipe-fittings-and-pipe/=e9n4m6
or a local plumbing supply store.  The thread is a British Standard Pipe Thread.  You have one in the other pipe for them to match.

Thank you, sir. I'll head to the store later. 

[ducpainter]

Use plenty of penetrating oil when removing the other plug.

I've never seen one fall out before, and sometimes they can be stubborn coming out and will strip threads.

[weas]

Finally got the plug in after some procrastination, and the exhaust sounds so much better.

Thanks for the help, guys. It feels good to be back on the Duc.