S2R1K Not sounding right

[Slide Panda]

Ok, so it burbles down, and you get a couple *pop*... *pop pop*? If so, it's probably something really simple.

Most times, a popping from the exhaust during deceleration is due a leak at some joint in the headers. The leak lets some air into the exhaust stream and lets a bit of secondary combustion occur. I had this happen on my old 620 - it got lose where a slip on met the main header and would let off a *pop!* *pop pop ppppp* as the engine spooled down

So go through the bike, loose any connections down stream of the spot where the headers meet the head !Don't loosen that header to head connection if you don't have to! - Give them a good wiggle and ensure the various sections of tubing seat as snugly and deeply as possible and tighten as you go. Working from from to back for the re-seating portion will probably make the job easier.

[Kabulpostie]

That makes sense, I had the tires changed and the pipes had to be removed... would that also explain a slight gas smell?

[DucDucGoos]

I wasn't clear on the stuttering..it is a sound from the exahst when I roll off the throttle...like gas is still being burned...guess on my part

Can you do a vid clip of the sound?

If not an exhaust leak, I would check the TB.

I synced my TB and it made a huge difference. Before I could tell the exhaust notes were off between the two, and grabbed a flathead and did by tone

[Slide Panda]

That makes sense, I had the tires changed and the pipes had to be removed... would that also explain a slight gas smell?

Slight gas smell? probably not - any my bike always smells a touch gassy. Had a look at your plugs at all? A gassy smell *might* be from running rich. But that's a might...

You might also ensure that your tank vent lines are not pinched. The tank was probably removed to access the valves and pinching a vent hose is far from uncommon when putting a tank back

[Howie]

Throttle body synch should always be checked after a valve adjustment.

[Kabulpostie]

Can you do a vid clip of the sound?

If not an exhaust leak, I would check the TB.

I synced my TB and it made a huge difference. Before I could tell the exhaust notes were off between the two, and grabbed a flathead and did by tone

Don't think I can get a vid as I only really notice it while under way..Will the location of TB be in my Snyder manual? And if I try and mess with this how bad can I screw it up? Is it just a sound thing?

[Ddan]

Check all your ignition wiring, something could have gotten nudged loose while you were in the airbox

[eric]

Ok, so it burbles down, and you get a couple *pop*... *pop pop*? If so, it's probably something really simple.

Most times, a popping from the exhaust during deceleration is due a leak at some joint in the headers. The leak lets some air into the exhaust stream and lets a bit of secondary combustion occur. I had this happen on my old 620 - it got lose where a slip on met the main header and would let off a *pop!* *pop pop ppppp* as the engine spooled down

So go through the bike, loose any connections down stream of the spot where the headers meet the head !Don't loosen that header to head connection if you don't have to! - Give them a good wiggle and ensure the various sections of tubing seat as snugly and deeply as possible and tighten as you go. Working from from to back for the re-seating portion will probably make the job easier.

Sorry to butt in, but I have exactly this problem. Is it a serious deal if I don't fix this right away, and ride around for a while having it do the *pop pop* thing?

[Kabulpostie]

Thank god I'm not the only (sorry for you though Eric )
So there is only one exhaust connection down stream of headers and it is tight.
Re seated all electrical connections

It just occured to me that when I had the valves done they replaced 2 spark plugs..why wouldn't you do all 4? below are pics of my plugs

Right Side (old plugs)



Left Side New Plugs

[Slide Panda]

You should have more than one connection.  There's the headers to the 'udder' and then the slip ons to the udder that's 4 joints to loosen shimmy and tighten.

Eric, not its not a big deal, but not normal operation either. And if there is a leak, hot exhaust gas is venting some place you might not want it to. Exhaust gas can be hot enought to melt plastic and wire insulation - so it's worth having a look.

Plugs, bit hard to see in the photos... But definitely not running particularly rich

[Kabulpostie]

Pipes are full termis...should i replace the two plugs that are older?

[Slide Panda]

If you really want to. Though they don't seem in a hard way. Checking the gap never hurts either.

Even with full termis, you have two joints right? One for each slip-on?

[Two dogs]

Not sure if this has any thing to do with your S2R ,
sounds like what others had suggested with a leak with the slip ons
my wife's 696 does exactly that she has badly fitting Termis.
I have a 06 S2R1K 40 thou K's only a couple of months after clearances done ,tune,throttle bodies synced ,new plugs it started to run really rough at idle and low revs and sound strange like yours .
I considered taking it back and getting a re tune , I decided to try something else first by adding some injector cleaner to the fuel. I was a bit skeptical about these products considering them like fishing lures catching fisherman more than fish. 
After a half a tank of fuel my S2R was transformed 
It runs so clean and crisp now I am totally sold on this as part of a semi regular part of maintenance.

[eric]

Eric, not its not a big deal, but not normal operation either. And if there is a leak, hot exhaust gas is venting some place you might not want it to. Exhaust gas can be hot enought to melt plastic and wire insulation - so it's worth having a look.

Thanks! I'm a bit embarrassed to report, I've been running it like that for well over 10k miles. The header got knocked loose multiple times going over some rough terrain, plus salt corrosion. I'm a bit endeared to the pop so never got around to replacing it 

[Slide Panda]

Well you don't need to replace it, unless it really job damaged on your epic travels. Just loosening, re-seating and re-tightening the joints is often times enough cure the problem.

Some high temp exhaust sealant and be added if you want to ensure things are sealed up.