Backfiring, stalling, and louder than usual - ZX6R Forum
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post #1 of 19 Old 05-06-2019, 07:46 PM Thread Starter
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On my ride tonight I noticed my 09 zx6r was alot louder than usual. Best way to explain it is that it sounded very raw. It was also back firing alot on decel, and when I came to a stop it stalled on my twice. The rpm would drop below 1000 and instead of rising back up, shed die. Started but up just fine though....
It was almost chugging/popping in 3rd gear around 5000-6000 rpm on the throttle...almost like a misfire.
I don't know where to start looking. I believe it seems to be either an air, fuel, or vacuum related issue. Didn't necessarily notice any drop in power... It just wasn't running the way it should...and the 2 stalls started to worry me and I wasn't enjoying being on the saddle.
I do have a proper dyno tune and a pcv.
Strange thing is, it would run well, then shitty, then start popping again, then would run fine.
Maybe even spark plugs or a coil? I got new plugs put in 2000 miles ago right before my dyno tune.
I'm a bit stumped here and hopefully it isn't anything too serious. Just thought some of you may be able to chime in before I take her to the mechanic.
Valve clearance and throttle synch also done 300 miles ago. Only really recognized the issue this evening. It did sound louder after my valve clearance though, but in a good strong way.
Thanks in advance

Last edited by rogal88; 05-06-2019 at 07:48 PM.
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post #2 of 19 Old 05-06-2019, 09:21 PM
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Backfiring/popping on trailing throttle indicates a lean mixture. The louder exhaust indicates an exhaust leak, which can also cause the trailing throttle popping. I would check the exhaust system over from head to tailpipe, checking for any loose bolts or connections. Was the exhaust system removed for the valve lash check?

It sounds to me like an exhaust gasket has died, but I wouldn't expect that to cause your low idle problems considering it is fuel injected. Since the throttle bodies were synched recently I would also look at them to be sure nothing is leaking air.


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post #3 of 19 Old 05-06-2019, 11:13 PM
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Im guessing it is louder on the inductions side as a blown exhaust is pretty distinctive sound wise.

was it low on fuel? had you just filled up?

Otherwise i wonder if some hose not properly installed or the airbox has not been fully seated when the valves has been done? I'd have the tank off.
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post #4 of 19 Old 05-07-2019, 02:00 AM
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If it's none of the above, you may have gotten a bad tank of gas.

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post #5 of 19 Old 05-07-2019, 05:10 AM Thread Starter
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I'll ride out the rest of this tank of gas and check the exhaust airbox also. I forgot to mention it only started hapenning when the bike was at operating temp...85+. When the temp was in the 60s she was running fine

Last edited by rogal88; 05-07-2019 at 05:12 AM.
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post #6 of 19 Old 05-07-2019, 07:08 AM
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PAIR valve system on the top of the valve cover, one of the covers loose? or the hoses that run between them and the air box etc

I would pull the tank and air box and take a look

none of your exhuast gaskets suddenly unexplicity went bad........... but you certainly can easily check to make sure all the nuts are on the exhuast header and that they are tight.

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post #7 of 19 Old 05-07-2019, 09:35 AM Thread Starter
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I am getting a new rear tire put on Saturday and my mechanic said he'd pop the tank off and look in there for me at no cost while someones doing the tire. He said it sounds like its vacuum related as it gets worse when the temp of the bike.
Could it even be a side stand switch issue? It's almost sounding and behaving like my it was when the battery died and the bike was running off the power of stator. I hope that't not the issue because the stator/rectifier job put a hole in my pocket and I'd hate to be over working the stator again and have to replace is 3000 miles later!

Last edited by rogal88; 05-07-2019 at 10:02 AM.
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post #8 of 19 Old 05-08-2019, 06:17 AM Thread Starter
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Did load test on my battery last night. 12.8v with bike off, 14.8v with bike running. When I got back from ride and turned bike off it read a full 13v so it looks like the charging system is working just fine.
Bike was running fine last night because it didn't reach operating temp because it was pretty chilly out.
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post #9 of 19 Old 05-08-2019, 01:30 PM
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Heaps of strange things happen when batteries for flat on modern vehicles.....but yours seems fine.
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post #10 of 19 Old 05-11-2019, 12:00 PM Thread Starter
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Air filter was fine, no oil in the airbox either. Pulled the plugs and all of em were black. Turns out the bike is running rich and the person that tuned my bike it throwing it on the dyno to make some adjustments. Plugs were only in bike for 4000km.
Ran perfectly fine with the new plugs.
Once I get my bike on the dyno I'll show u results.
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post #11 of 19 Old 05-16-2019, 06:45 AM Thread Starter
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Update. Was riding around town last night and low and behold bike was running rough again. When I am in stop and go traffic it seems to run at it's worst as it stalled out on me as I was coming to a stop in 1st and pulled the clutch in. Started up fine. It popped 2 or 3 times easy on the throttle in 1st gear which means it is also misfiring, not just backfiring like a mofo.
I am taking it to my tuner tomorrow and he is going to do a diagnostic on the dyno (be is almost certain it is a sensor issue as it only seems to be happening in certain conditions when the bike gets warm), but I don't want to put any strain on the bike (its a 70mile hike).
Do you think it could be something electric related? fouled wires? I am still getting a wif of something very similary to how maxima chain wax smells when over spray goes on the pipe. The smell seems to be coming from the radiator area.
What do you guys think? Drop it off at the shop and let them have it for a while, or take it to my tuner to see if something is off with the map. Maps don't change and nothing has been modified to my bike since I got it tuned....and it was running great all summer after the tune.
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post #12 of 19 Old 05-20-2019, 09:39 AM Thread Starter
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And the saga continues. I took her back to burly cycle as it really only started acting up after valve clearance. They did a full inspection of the bike... Valves are in spec, the timing is ok, and they couldn't figure out why it was running poorly. 2 techs took it out for 20 minutes each and said it was all smiles and it runs fantastic. Weird because it was back firing and mis firing on the ride there and stalled when I arrived.
They didn't charge me for the service as nothing needed to be replaced.
Kinda strange......Think maybe they found out something they did incorrectly and fixed it, then just didn't want to say they fucked up?
I'll see how she runs when I pick it up Wednesday evening
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post #13 of 19 Old 05-20-2019, 11:55 AM
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If it happens again, consider bypassing the power commander. I've had a wire on one short before and intermittently have my old R1 run like shit.
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post #14 of 19 Old 05-20-2019, 12:38 PM Thread Starter
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Quote:
Originally Posted by pro1984 View Post
If it happens again, consider bypassing the power commander. I've had a wire on one short before and intermittently have my old R1 run like shit.
Do I need to completely take the power commander out. Or can I just remove the plugs from the injectors and hook up the stock ones?

Last edited by rogal88; 05-20-2019 at 12:59 PM.
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post #15 of 19 Old 05-20-2019, 01:21 PM
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Lol wonder if they fixed it then didnít want to say they made a mistake

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