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.
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.
Popping on decel can also be caused by an exhaust leak.
If the bike runs well otherwise I would check.
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.
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.
+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.
Okay, so I went out to check the exhaust and 5 seconds later it was immediately clear where the leak was:
(http://i.imgur.com/Nv7hX.jpg)
Turned the bike on and it's just blasting exhaust. [bang] Now my question is, what fell out and where can I buy it? [drink]
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.
Quote from: WetDuc on September 27, 2011, 04:38:51 PM
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.
I have the same issue but I think I like it...my friends say when I downshift to pass I put out flames...
I don't remember the size, but
http://www.mcmaster.com/#brass-pipe-fittings-and-pipe/=e9n4m6 (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.
Quote from: talljoker on September 28, 2011, 04:33:42 PM
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.
Quote from: howie on September 28, 2011, 10:05:42 PM
I don't remember the size, but
http://www.mcmaster.com/#brass-pipe-fittings-and-pipe/=e9n4m6 (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. [clap]
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.
Finally got the plug in after some procrastination, and the exhaust sounds so much better. ;D
Thanks for the help, guys. It feels good to be back on the Duc. [Dolph]