Please help me
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Joined: Mar 2012
Posts: 69
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From: Jacksonville, nc
I tried the lighter trick and no excess movement of the flame besides from the rumble of the motor lol. Guess ill give fuel moto a call. For some reason it seems like it runs better using negative numbers. But also i noticed since i have had it as 5 the throttle response kicks out sometimes. Its only happened once or twice.
Cruiser
Joined: Jan 2012
Posts: 120
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From: Bakersfield, CA
That popping could be normal. remember you took your muffler off, which would have baffled the popping sounds. I had the same issue when I went with the big shots on my RK last year. Vance and Hines will even tell you that you might hear it more because there is no muffler to quiet it down.
Decel popping occurs when one of two things are present.
1. The bike is so lean the exhaust is superheated and is burning the unburnt fuel that is in the pipes (there is always some unburnt fuel in the pipes no matter how lean). This is very rare, and does not occur with the stock map and free flowing pipes being the only change.
2. The AFR IN THE pipes is just right to burn the unburnt fuel. This is quite a common occurrence when free flowing pipes are installed (whether or not a free flow A/C is installed).
To get rid of decel popping a lot of people put MORE fuel than is needed into the engine/over-richening the AFR so that more unburnt fuel goes into exhaust, changing the AFR in the exhaust so that is no longer optimum for combustion in the pipes. This is just a waste of gas. And if using decel enleanment found on most tuners it is still really hard to get rid of the popping/burbling when the injectors kick back in at about 1750 rpm.
Another way to get rid of decel popping is to change the AFR in the pipes (mufflers/Slip-ons).
The first thing to do, as mentioned above, is to make sure there are no leaks in the exhaust system letting extra air in.
If the AFR in the exhaust is still conducive to popping then you can try different baffles, a lolipop or Thunder Torque Inserts.
The benefit to the TTI's is that it will let you keep your sound, increase the low and mid range power, and reduce/eliminate the decel pop by reducing/eliminating reversion, thus changing the AFR (in the pipes) to one that is not conducive to combustion.
1. The bike is so lean the exhaust is superheated and is burning the unburnt fuel that is in the pipes (there is always some unburnt fuel in the pipes no matter how lean). This is very rare, and does not occur with the stock map and free flowing pipes being the only change.
2. The AFR IN THE pipes is just right to burn the unburnt fuel. This is quite a common occurrence when free flowing pipes are installed (whether or not a free flow A/C is installed).
To get rid of decel popping a lot of people put MORE fuel than is needed into the engine/over-richening the AFR so that more unburnt fuel goes into exhaust, changing the AFR in the exhaust so that is no longer optimum for combustion in the pipes. This is just a waste of gas. And if using decel enleanment found on most tuners it is still really hard to get rid of the popping/burbling when the injectors kick back in at about 1750 rpm.
Another way to get rid of decel popping is to change the AFR in the pipes (mufflers/Slip-ons).
The first thing to do, as mentioned above, is to make sure there are no leaks in the exhaust system letting extra air in.
If the AFR in the exhaust is still conducive to popping then you can try different baffles, a lolipop or Thunder Torque Inserts.
The benefit to the TTI's is that it will let you keep your sound, increase the low and mid range power, and reduce/eliminate the decel pop by reducing/eliminating reversion, thus changing the AFR (in the pipes) to one that is not conducive to combustion.
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If I were set on getting rid of the decel pop via additional fuel, I would call Jamie at Fuelmoto for his advice.
A more economical way to get rid of the decel pop is to change the AFR in the pipes with the Thunder Torque Inserts. Additional benefit to that is that you will pick up some low and mid range power.
Tourer
Joined: Mar 2010
Posts: 265
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From: Mandeville, Louisiana
Don't know what year/model bike you have but I'll throw this out there for what it's worth. I have an 07 FLHRS, Jackpots and at the time, the FM PCIII. I had decel popping and popping between up shifts. FM sent me different maps and I also tried adding and then subtracting fuel from the #1 column. Nothing worked. I checked for exhaust leaks but did not find any. Turned out my "Y" piped had a small crack in it that was drawing in air. That was the problem. I now have the PV and all is good.
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Joined: Mar 2012
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From: Jacksonville, nc
After messing around with the numbers I found that adding a little fuel and making it 15 instead of 5 it seemed to help. Going negative made it pop more and more and going to positive 25 made it also pop. I've emailed jamie at fuel moto already just waiting on a response. the pops dont really bother me, as long as they wont hurt my bike.
After messing around with the numbers I found that adding a little fuel and making it 15 instead of 5 it seemed to help. Going negative made it pop more and more and going to positive 25 made it also pop. I've emailed jamie at fuel moto already just waiting on a response. the pops dont really bother me, as long as they wont hurt my bike.
Once I get the AFR in the combustion chamber right (a good tune for performance), then, if I am not getting popping from the exhaust, I will "tune" the AFR in the exhaust tract so that I get nice decel pop. (by "tuning" the AFR in the exhaust tract I mean changing the air flow there, Not compromising my performance in the combustion chamber AFR).
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Road Warrior
Joined: Feb 2011
Posts: 1,335
Likes: 1
From: Indiana
I just had that same thing going on and i had mine retuned and it took care of it. He said that on my decel it was showing maxed out on the lean side. The HD dealer took care of mine for $38.00.
Last edited by justglidin; Jan 1, 2013 at 04:23 PM.