Popping on Decel - Victory Forums - Victory Motorcycle Forum
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post #1 of 21 (permalink) Old 05-22-2015, 11:49 AM Thread Starter
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Default Popping on Decel

Long story short my bike got the V&H pipes, PCV, cams, timing wheel, Lloydz air filter and of course was dyno tuned by one of the big guys. After all these goodies I have a pop on Decel. I have read a technical tip at Lloydz webpage that there are many reasons for this to happen, and there is a list of things to do to determine the cause. The list is the following:

1. Cure the lean condition --- It was cured when it was dyno tuned
2. Cure all the exhaust leaks
3. Cure the intake leak
4. Cure the happy hand movements --- I do not think that I fall into this category
5. Cure the leaky injectors

I do not have a clue on how to check for the exhaust leaks, I can re-check if the torque values of the nuts at the header level are ok and also at the clamps on the pipes, but beside that I am clueless. If all are torqued ok, what is the best way to check for leaks on the gaskets or on the actual pipes? If by any reason I do not find the leak on the pipes, I think only dealership can do 3 and 5, and really I do not trust my dealership to do it (another story). How bad is for the engine to have this popping condition until in the near future I can visit one of the big guys?

2014 XCT, Utopia Backrest, Guard Dawg, Longhorn brake pedal, ISO Longhorn shifter, Arlen Ness gas cap, VM-1 Cams, Lloydz ATS, Lloydz air filter, PCV, Madstad Windshield, Victory HID, Vance & Hines Hi-output. 118/120 Dyno tuned by Kyle.
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post #2 of 21 (permalink) Old 05-22-2015, 11:59 AM
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Is it popping out the pipes or backfiring through the intake ? popping through the pipes is harmless in the short term , unless you are running super lean , I cant even fathom this issue if you just has one of the big guys working on your bike ... Guess nobody's perfect . If your backfiring through the intake , I wouldn't even start it again until it gets professional attention . This could be a timing issue do to improper cam chain alignment .

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2014 XC , Lloyds A/F , Timing Wheel +4 , PCV , Miller Mufflers , 1/4 Turn Throttle Ring , Dyno Tuned by KMC Powersports 98HP 113 TQ
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post #3 of 21 (permalink) Old 05-22-2015, 02:14 PM
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I've held a lit candle or the end of a long fireplace lighter near the exhaust port and looked to see if the flame flickered as if it was being blown on by a leak in the gasket.

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post #4 of 21 (permalink) Old 05-22-2015, 02:23 PM Thread Starter
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Quote:
Originally Posted by LILMAGS500 View Post
Is it popping out the pipes or backfiring through the intake ? popping through the pipes is harmless in the short term , unless you are running super lean , I cant even fathom this issue if you just has one of the big guys working on your bike ... Guess nobody's perfect . If your backfiring through the intake , I wouldn't even start it again until it gets professional attention . This could be a timing issue do to improper cam chain alignment .
Thanks for the answer my felling on the popping it is on the pipes if I am hearing correctly, but really I do not know the difference in sound between the popping through the pipes and the backfiring through the intake, unless the backfiring sound is o the engine and the popping sound is on the exhaust, because mine sounds at the end of the pipe.

2014 XCT, Utopia Backrest, Guard Dawg, Longhorn brake pedal, ISO Longhorn shifter, Arlen Ness gas cap, VM-1 Cams, Lloydz ATS, Lloydz air filter, PCV, Madstad Windshield, Victory HID, Vance & Hines Hi-output. 118/120 Dyno tuned by Kyle.
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post #5 of 21 (permalink) Old 05-22-2015, 02:54 PM
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I've found popping on decel to be a lean condition and conversely upshift popping to be a symptom of an overly rich condition ... I just cant understand this issue after having a professional do the work ... If the popping is at the pipe that's the better alternative ... If its at the motor/intake , you don't want to be riding it that way . I would contact the shop that did the work ASAP and ask them to please advise ....

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2014 XC , Lloyds A/F , Timing Wheel +4 , PCV , Miller Mufflers , 1/4 Turn Throttle Ring , Dyno Tuned by KMC Powersports 98HP 113 TQ
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post #6 of 21 (permalink) Old 05-22-2015, 07:16 PM
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Light up a bowl, joint, bong, 1-hitter, what have you, and blow the smoke at the exhaust manifold where it meets the heads...while it's running of course, then you'll easily see if you have a leak there.

As far as the popping, finding out where it is popping is important. Sometimes decel popping is very hard to eliminate especially if you chop off the throttle or have very short pipes.

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post #7 of 21 (permalink) Old 05-22-2015, 09:53 PM
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You stated you have "a pop on decal" do you always pop on decal. Are you running RPM's up then slamming the throttle shut?

Your new pipes V&H's are going to let you hear the popping that you couldn't hear with the stock cans on. Yes your bike was popping when it was stock.....It's just that you can hear it now.

Go thru all of your connections where you installed the Vance n Hines after running the bike and its warm then the next morning check them again when it is cold.

Call your tuner. He will ask you questions and lead you in the right direction. If he didn't install your exhaust then he is not really responsible for it. Did it do it on the DYNO ?

2011 Cross Country. D&D's wrapped - VM1DR cams - PC5 - LLoyds high performance filter and ATS (Adjustable Timing system). Power output 115HP/115FTLBS tuned by KMC. Klock Werks flip shield - RF/PBR300x4 amp - Hertz HCX 6.5's - Victory 6X9 Magnum Lids - Victory XM - HMD Black Pull Backs with Victory performance grips. PIAA Led3 driving lights. accessories from Arlen ness - Witch Doctors - Noemtz Designs - Kuryakyn. Blacked out treatment powder Coat by PPC Stuart fl.
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post #8 of 21 (permalink) Old 05-22-2015, 10:03 PM
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My train of thought is when you hotting up an engine and particuarly fitting a low restriction exhaust, that you gotta expect it to sound a bit like a hotrod on decel.
Fair enough not like a bloody machine gun but a little snap crackle and pop is character.
Friend on mine recently bought a 2012 Fatboy with dealer fitted Vance and Hines shotguns, and a screaming eagle fuel controller.
sounds wicked under power but back off and its a cacopheny of bangs not unlike a machine gun being fired.
My thoughts are it needs a PCV and a good tune to get it back to something thats livable with, at the moment its ridiculous.
But its not my bike, I cant see the point in buying an expensive bike and not setting up the tune.
Getting off topic here, what Im saying is free breathing pipes are gonna have some degree of 'character' on decel.
Thats the way I see it anyway.

Victory Vegas 2010
Lloydz 109"cube big bore
" " 495 cams
" " TorqueTubes
" " timing wheel @4 deg.
" " Primary plate
" " IAV
RPW Slash pipes
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1 3/4" 'Burleigh Bars'
Stebel air horn
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114/123

Victory Cross Country 2010 (106)
Lloyds air filter
" " VM1 Cams
Home gutted exhaust
Maximus
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post #9 of 21 (permalink) Old 05-22-2015, 10:06 PM
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On my last bike I found popping on deceleration directly linked to timing and the high octane number on the fuel if I ran premium. The lower the octane the cooler the cylinders and I believe it is recommended to run the Vics at the lowest octane you can without getting knock. Try dropping a class on your next fill-up and see if it makes a difference. If it doesn't, you've lost nothing and can start looking for the cracks.

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post #10 of 21 (permalink) Old 07-30-2015, 01:33 PM
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Quote:
Originally Posted by Jlvazquez6 View Post
Long story short my bike got the V&H pipes, PCV, cams, timing wheel, Lloydz air filter and of course was dyno tuned by one of the big guys. After all these goodies I have a pop on Decel. I have read a technical tip at Lloydz webpage that there are many reasons for this to happen, and there is a list of things to do to determine the cause. The list is the following:

1. Cure the lean condition --- It was cured when it was dyno tuned
2. Cure all the exhaust leaks
3. Cure the intake leak
4. Cure the happy hand movements --- I do not think that I fall into this category
5. Cure the leaky injectors

I do not have a clue on how to check for the exhaust leaks, I can re-check if the torque values of the nuts at the header level are ok and also at the clamps on the pipes, but beside that I am clueless. If all are torqued ok, what is the best way to check for leaks on the gaskets or on the actual pipes? If by any reason I do not find the leak on the pipes, I think only dealership can do 3 and 5, and really I do not trust my dealership to do it (another story). How bad is for the engine to have this popping condition until in the near future I can visit one of the big guys?
If you listened carefully to you exhaust sounds before V&H and other mods you would have heard the very same stock sounds under same conditions only very muted. I did and the same sound pattern is there with V&H Slip-ons, high flow K&N air filter only many times louder... not to worry but enjoy.
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