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Discussion Starter #1
I've got an '06 that has back-fired ever since I gutted my cats. I put on the Dan Kyle block-off plates (which didn't have any sort of remedy), and I just got it custom mapped (which helped quite a bit). But I still get a single infrequent 'POP' at around 3000 rpm under decel with the throttle completely closed. Is this an indication that it is running lean??? And would changing the map (either more or less fuel) at 0% throttle remedy this at all????
 

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I've got an '06 that has back-fired ever since I gutted my cats. I put on the Dan Kyle block-off plates (which didn't have any sort of remedy), and I just got it custom mapped (which helped quite a bit). But I still get a single infrequent 'POP' at around 3000 rpm under decel with the throttle completely closed. Is this an indication that it is running lean??? And would changing the map (either more or less fuel) at 0% throttle remedy this at all????
Popping down low is definetly lean on the bottom end. Usually the block off plates will take care of that, but not always. I would add some fuel down low. It should take care of it. Make a little change, then take it for a ride. Do that until it goes away.
 

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In complete stock form the 10 backfires and the reason you don't hear it is due to the cats, OEM canisters etc but its there in a muffled sort of way and when you remove the cats it became more noticable, and when slip-ons are added it becomes even more noticable so its not as critical as one would think.

BD
 

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Throttle butterflies can be too far open on closed throttle, check your idle adjustment and TPS settings.
 

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I was under the impression it was due to a rich condition, not lean, after all it is unburned fuel exiting the exhaust and igniting. My beet system throws umbelievable flames every now and then. If you look at pictures of race bikes you will se some amazing pictures of Zx-10R's and R-1's especially that are throwing huge flames out of the tail pipes.

Some body back me up here, flames and backfiring is a rich condition not lean.
 

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Discussion Starter #6
OH...forgot to mention...I disabled the exhaust butterfly also. I have always noticed the little pops before, but that didn't bother me. What I am talking about is a single BOOM with a big blue flame coming out of the exhaust. This happens when I am 'taking it easy' on decel. So, where do I want my idle to be? And how do I adjust the Throttle Positioning sensor?? Also, I have heard it both ways .... lean conditions and rich conditions. Anyone know for sure which is correct??? I actually noticed E-Bostroms bike blowing the flame out in this last Laguna superbike race... But again...It only happens in the low RPM's for me.
 

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La Flama Blanca
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OH...forgot to mention...I disabled the exhaust butterfly also. I have always noticed the little pops before, but that didn't bother me. What I am talking about is a single BOOM with a big blue flame coming out of the exhaust. This happens when I am 'taking it easy' on decel. So, where do I want my idle to be? And how do I adjust the Throttle Positioning sensor?? Also, I have heard it both ways .... lean conditions and rich conditions. Anyone know for sure which is correct??? I actually noticed E-Bostroms bike blowing the flame out in this last Laguna superbike race... But again...It only happens in the low RPM's for me.

Yeah if you notice the race bikes do it comming into the corner while braking coming down wit hthe engine braking. My 04 does it as well. I think it is not much to worry about, just unburned fuel exiting through the exhaust.
 

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You can get a lot of unburned fuel from mixtures not igniting under decell, the fuel eventually accumulates in the exhaust giving you a backfire, and a sooty exhaust tip.So in one sense there is too much fuel under closed throttle or there could be a lean spot giving you a missfire and not enough fuel to combust, could be either.

If the TPS isnt set with the PC111 map then you can have too much fuel at closed throttle or sometimes not enough depending upon which part of the map you are in.

Another common occurence is a leaky joint in the exhaust , then the unburned fuel becomes stoich and ignites.

So many variables.
 

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I've got an '06 that has back-fired ever since I gutted my cats. I put on the Dan Kyle block-off plates (which didn't have any sort of remedy), and I just got it custom mapped (which helped quite a bit). But I still get a single infrequent 'POP' at around 3000 rpm under decel with the throttle completely closed. Is this an indication that it is running lean??? And would changing the map (either more or less fuel) at 0% throttle remedy this at all????
Did you also remove the valve? Or just block-off the plates.
I do not know the answer here, but maybe this has something to do with it. I know I have gutted my cat and baffles, but I pulled the valve too, and I have NO back fires ever.
 

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I get the occasional "big one" but not from completely closed throttle on decel about 3000 RPM , but if I look at my PC map I can see why, at 3000RPM at TP 2 I am adding more fuel than stock.
 

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Discussion Starter #11
I don't expect anyone to bend over backwards for me, but if someone wants to, they can look at my map. TREAD70 just posted my map in the map sticky a day or two ago. It should be one of the last ones. Any recommendations would greatly be appreciated. Also...I didn't remove the valve...I just disconnected the cables. Again...I only get the BOOM inbetween 3000-3600 rpms.
 

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I just looked at your map, you have +7 fuel from 2250 to 3500 RPM's on closed throttle, it should be 0 's.
 

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The only time you could reach 3500RPM on a closed throttle is on decel, so you dont need any fuel there.

And if you are picking up throttle from closed at 3500RPM for some strange reason then you would be better off using the accelerator pump feature.
 

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Discussion Starter #15
I'll give that a try tonight and let ya know how it goes....Thnk again.... You're beginning to know my bike intimately!!! :)
 

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my bike has backfire on decel for the last 15k miles. it wont hurt anything. just unburnt fuel... i think it sounds cool
 

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Discussion Starter #19
Well, if it's gonna be a mutha to fix, then I'm not going to stress over it anymore. It just still surprises the hell outta me when it does happen....If I could get it to happen on command, then that'd be something different. I was just hoping that there was a simple fix for it....
 
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