Rich mixture or other causes?
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Joined: Dec 2014
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From: Vilnius
Rich mixture or other causes?
Hi, I have Dyna FXDB 2009 injection 96cc. It has SE2 slip on exhaust. The thing is that if I open a throttle to higher RPM and release, I have bang bang and flames coming from an exhaust. It could be while riding and changing gears or even on neutral when standing. At first it was kinda cool, but now worrying that it is not healthy for the motor. One of the causes I guess could be that I have no inserts on slip-ons, they are empty. The other is something to do with a fuel mixture, but i doubt as it is injection Any thoughts?
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Joined: Jun 2013
Posts: 57
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From: duanesburg,new york
Deffinetly needs a tune. My friend has a black line he put an exhaust and intake on and didnt want to spend money for a tuner or reflash. It was doing the same thing. It was pretty annoying to ride alongside of.
Tourer
Joined: Mar 2015
Posts: 345
Likes: 3
From: New Jersey
Wipe the inside of your exhaust with your fingers . I'll bet you get nice black finger tips. If so you are running rich. Like with open pipes exhaust gasses reverb back into the exhaust causing popping. Check this topic out. Fix my popping just yesterday. I really can't believe it
https://www.hdforums.com/forum/softa...confirmed.html
https://www.hdforums.com/forum/softa...confirmed.html
Last edited by 97 dyna lowrider; Jun 26, 2015 at 09:01 AM.
Seasoned HDF Member
Joined: Jul 2008
Posts: 9,282
Likes: 1,139
From: southeast PA
I doubt it's too rich. If anything it's too lean, sounds like typical decel pop. The exhaust gets so hot that what you're hearing is excess unburnt fuel igniting in the pipes. Running mufflers without baffles just makes it sound worse, plus you need some back pressure that the baffles would give you. The motor will run better with them.
Before worrying about the tune I would first check for any intake and exhaust leaks.
Then install some type of baffle.
Before worrying about the tune I would first check for any intake and exhaust leaks.
Then install some type of baffle.
Tourer
Joined: Mar 2015
Posts: 345
Likes: 3
From: New Jersey
I knew it. Decel pop is not lean. Call me crazy. Does it sound right when you say there is unburnt fuel in the exhaust which ignites. But it's running lean? Lean means not enough fuel right? So if unburnt fuel is in the exhaust which then ignites. That means there is un-used fuel in the exhaust. Which would mean too much fuel rich? This is the exact thing the video is talking about
https://www.hdforums.com/forum/softa...confirmed.html
Wipe the inside of pipe post a pic. You can't have a pop with out unburnt fuel which then ignite/detonates at the wrong time causing a pop. i don't understand why people are saying lean. If it's lean then there is no unburnt fuel to detonate. Lean means not enough fuel. so if there is no unburnt fuel then no pop.Wipe the inside of the pipe it's as simple as that I guarantee your fingers come out black. However even if tuned even then it might not totally go away
My bike pops like crazy until I installed the thumbscrews it acts like a baffle it disrupts the exhaust flow doesn't allow exhaust to reverb back into its self helping to stop the decel popping.
Rich very rich
Thumbscrews after 1 ride almost black running rich not lean no more pop at all still rich
https://www.hdforums.com/forum/softa...confirmed.html
Wipe the inside of pipe post a pic. You can't have a pop with out unburnt fuel which then ignite/detonates at the wrong time causing a pop. i don't understand why people are saying lean. If it's lean then there is no unburnt fuel to detonate. Lean means not enough fuel. so if there is no unburnt fuel then no pop.Wipe the inside of the pipe it's as simple as that I guarantee your fingers come out black. However even if tuned even then it might not totally go away
My bike pops like crazy until I installed the thumbscrews it acts like a baffle it disrupts the exhaust flow doesn't allow exhaust to reverb back into its self helping to stop the decel popping.
Rich very rich
Thumbscrews after 1 ride almost black running rich not lean no more pop at all still rich
Last edited by 97 dyna lowrider; Jun 26, 2015 at 06:57 PM.
Tourer
Joined: Mar 2015
Posts: 345
Likes: 3
From: New Jersey
I've installed them on my bike and my buddies 2013 fatboy. He still has a little popping but big power change so he says. I also notice the bike just goes now effortlessly. 65-80 mph. 25-3500 rpm in every gear feels better much better.
A little pop is good you need a little extra fuel for hard acceleration. Without a little extra fuel when accelerating hard the bike sucking in more air needing that little extra fuel Will run lean. Without that extra fuel you will kill your acceleration and TopSpeed.(lean no enough fuel). But too much is no good as you can tell popping backfiring and flames. the bike will also spit and sputter during hard acceleration if too rich. It's a balance.
It's the same reason a nitrous car has to run rich. Nitrous is just more air for the car. More air more fuel. If not motor runs lean and boom. Fireworks
.
A little pop is good you need a little extra fuel for hard acceleration. Without a little extra fuel when accelerating hard the bike sucking in more air needing that little extra fuel Will run lean. Without that extra fuel you will kill your acceleration and TopSpeed.(lean no enough fuel). But too much is no good as you can tell popping backfiring and flames. the bike will also spit and sputter during hard acceleration if too rich. It's a balance.
It's the same reason a nitrous car has to run rich. Nitrous is just more air for the car. More air more fuel. If not motor runs lean and boom. Fireworks
.
Last edited by 97 dyna lowrider; Jun 27, 2015 at 07:38 AM.
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Seasoned HDF Member
Joined: Jul 2008
Posts: 9,282
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From: southeast PA
Lollipops have been around for a long time. I've used them myself. They do work.
But that doesn't explain how the bike is running rich, if it actually is. For an already lean-tuned EFI bike there has to be something really wrong for it to be rich.
But that doesn't explain how the bike is running rich, if it actually is. For an already lean-tuned EFI bike there has to be something really wrong for it to be rich.
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Tourer
Joined: Mar 2015
Posts: 345
Likes: 3
From: New Jersey
I'm not trying to be a jerk just trying to help you understand. Please don't take offense.
Not having the baffles(inserts) as he stated in his exhaust is what is causing it to run rich. His bike is not tuned lean. The bike is factory tuned for its factory exhaust. Removing the baffles from the slip on is what is causing it to run rich. The bike couldn't run rich if it was tuned lean. The computer is set at what it is set at. He did not mess with it. It has nothing to do with his computer tune. He removed the baffles from his exhaust. It's like having open pipes. it's the exhaust causing it. You cannot run a motor lean if you do you will cause damage to the motor. The bike will overheat poor performance the exhaust will get extremely hot and possible catastrophic engine failure. Worst case running rich is poor performance fouled plugs possibly blowing out the muffler from popping also known as backfiring. Bikes are not lean from factory they are tuned for efficiency. Such as emissions and gas mileage . They are not tuned for performance.when tooning for performance you're always adding more of everything such as fue air and exhaustl. Which is why your fuel efficiency goes down with performance because you have to richen the bike up. It doesn't mean they are lean from the factory. they're just not tuned for performance.
The video explaines the exhaust poping problem and what causes it.
Not having the baffles(inserts) as he stated in his exhaust is what is causing it to run rich. His bike is not tuned lean. The bike is factory tuned for its factory exhaust. Removing the baffles from the slip on is what is causing it to run rich. The bike couldn't run rich if it was tuned lean. The computer is set at what it is set at. He did not mess with it. It has nothing to do with his computer tune. He removed the baffles from his exhaust. It's like having open pipes. it's the exhaust causing it. You cannot run a motor lean if you do you will cause damage to the motor. The bike will overheat poor performance the exhaust will get extremely hot and possible catastrophic engine failure. Worst case running rich is poor performance fouled plugs possibly blowing out the muffler from popping also known as backfiring. Bikes are not lean from factory they are tuned for efficiency. Such as emissions and gas mileage . They are not tuned for performance.when tooning for performance you're always adding more of everything such as fue air and exhaustl. Which is why your fuel efficiency goes down with performance because you have to richen the bike up. It doesn't mean they are lean from the factory. they're just not tuned for performance.
The video explaines the exhaust poping problem and what causes it.
Last edited by 97 dyna lowrider; Jun 27, 2015 at 10:49 AM.
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