Slip on causing
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2nd Gear
Joined: May 2017
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From: Texas
Slip on causing
The details pertain to a Dyna Lowrider S from Harley. Recently, we swapped out the exhaust pipes for slip ons. Where the stock pipes meet the new Vance Hines slip-ons, we didn't use the original clamps, and instead used clamps that were weaker than the factory clamps that were initially holding the pipes together. While there was a leak where the clamp originally held down the stock pipes, we were told (by a very well-known company that I'll choose to protect) that small leaks were normal, and "it was not that big a deal." We noticed some popping, but only on deceleration. I researched online, and learned that this was generally normal. Backfiring, however, is not and hope this isn't the problem (I don't know why- one article just said it was bad, and I don't know the long-term effects for that cause). Yesterday, the bike wouldn't start. It would attempt to, but it wouldn't fully crank. It sounded as if it was going to start, but it would shut off. We called the tow truck to take it to Harley, and we have yet to hear what the problem is. Could the leak have been the result of this?
By the way, I am a new rider. I know my issue may sound novice, or silly to some. However, everyone starts somewhere and this happens to be my first major problem. Thank you in advance to all who treat my question with sincerity and serious consideration. Have a great day.
By the way, I am a new rider. I know my issue may sound novice, or silly to some. However, everyone starts somewhere and this happens to be my first major problem. Thank you in advance to all who treat my question with sincerity and serious consideration. Have a great day.
Last edited by Zelos29; May 2, 2017 at 05:41 AM. Reason: more information and a little more clarity
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2nd Gear
Joined: May 2017
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From: Texas
Hope you're right
Thanks for the response Qdog! Based on the limited info I provided, your guess is as good as anyone else's. The battery wouldn't be my first guess because it's brand new, but I hope you're right. I'm afraid exhaust backfiring would cause internal complications (I really don't know what I'm saying right now). Would tending the battery although it is brand new cause the battery's energy to diminish faster? It's at the Harley shop and I'll let you know what the problem was. I just wanted some guesses for the meantime.
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From: Galt's Gulch - MI
This is starting to become a trend with these S models. 
Zelos29, do a search here on the forum, we've had several threads discussing battery and starting issues with the S model, the pipes had no connection to your starting problem.
The decel issue is a separate problem, fresh air is mixing with unburnt fuel when you're off-throttle and burning off in the hot pipes when the AFR is right, it's annoying but isn't causing any engine complications. There are ways to deal with decel popping and burbling, you don't have to live with it...
Zelos29, do a search here on the forum, we've had several threads discussing battery and starting issues with the S model, the pipes had no connection to your starting problem.
The decel issue is a separate problem, fresh air is mixing with unburnt fuel when you're off-throttle and burning off in the hot pipes when the AFR is right, it's annoying but isn't causing any engine complications. There are ways to deal with decel popping and burbling, you don't have to live with it...
Thread Starter
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2nd Gear
Joined: May 2017
Posts: 6
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From: Texas
This is starting to become a trend with these S models.
Zelos29, do a search here on the forum, we've had several threads discussing battery and starting issues with the S model, the pipes had no connection to your starting problem.
The decel issue is a separate problem, fresh air is mixing with unburnt fuel when you're off-throttle and burning off in the hot pipes when the AFR is right, it's annoying but isn't causing any engine complications. There are ways to deal with decel popping and burbling, you don't have to live with it...
Zelos29, do a search here on the forum, we've had several threads discussing battery and starting issues with the S model, the pipes had no connection to your starting problem.
The decel issue is a separate problem, fresh air is mixing with unburnt fuel when you're off-throttle and burning off in the hot pipes when the AFR is right, it's annoying but isn't causing any engine complications. There are ways to deal with decel popping and burbling, you don't have to live with it...
Thank you for replying! I hope you're right as well, but at the same time, I wish it isn't truly a trend with S models. I will take your advice and search as you've recommended. I wonder if those having ignition problems have also changed out stock pipes for slip-ons. The only thing that made me guess it may be the slip-ons not properly installed being the cause is because the bike seemed to be doing just fine before the slip-ons (but mainly because I'm new with everything). Nevertheless, I would be happy to hear no internal mechanical/engine issues are caused from the leaking, considering the cost of replacing some pipes and a battery opposed to engine work or more. Thanks!
Slip-on and clamps had nothing to do with this problem.
a tune adjustment will fix the popping.
like mentioned above there have been start issues with the S. The dealer will have to get to the bottom of this
a tune adjustment will fix the popping.
like mentioned above there have been start issues with the S. The dealer will have to get to the bottom of this
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2nd Gear
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From: Texas
Thank you for your reply. It's sounding like this is a silly question I'm asking. I appreciate your feedback. Have a great day!
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From: Galt's Gulch - MI
TinCupChalice,
Thank you for replying! I hope you're right as well, but at the same time, I wish it isn't truly a trend with S models. I will take your advice and search as you've recommended. I wonder if those having ignition problems have also changed out stock pipes for slip-ons. The only thing that made me guess it may be the slip-ons not properly installed being the cause is because the bike seemed to be doing just fine before the slip-ons (but mainly because I'm new with everything). Nevertheless, I would be happy to hear no internal mechanical/engine issues are caused from the leaking, considering the cost of replacing some pipes and a battery opposed to engine work or more. Thanks!
Thank you for replying! I hope you're right as well, but at the same time, I wish it isn't truly a trend with S models. I will take your advice and search as you've recommended. I wonder if those having ignition problems have also changed out stock pipes for slip-ons. The only thing that made me guess it may be the slip-ons not properly installed being the cause is because the bike seemed to be doing just fine before the slip-ons (but mainly because I'm new with everything). Nevertheless, I would be happy to hear no internal mechanical/engine issues are caused from the leaking, considering the cost of replacing some pipes and a battery opposed to engine work or more. Thanks!
With the exhaust the first thing will be to make certain you don't have any exhaust leaks; sounds like you may have one at this point. From there it's a case of proper tuning and perhaps a slight tweak to your decel fueling and decel V/E's to remove the decel popping and burbling.
Installing slip-on's you've put on a more free flowing exhaust which is allowing fresh air to enter the slip-on's; it's called reversion. People commonly believe the bike is 'lean' when they hear the decel popping but it's the fresh air mixing with the unburnt fuel burning off. Proper tuning and working on preventing the reversion take care of that annoying decel issue.
You may find you'll benefit from removing the baffles in the slip-on's and adding DK Custom Thunder Torque inserts. The TTI's will give you a deeper tone to the exhaust, improve your low and mid range torque, increase exhaust gas velocity, and help prevent reversion due to their shape.
But, the battery/starting thing? Yea... do a search for club member 'Mchad', read some of his threads; he's been up and down that broken trail already
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From: NW Ohio
MoCo really needs to issue a TSB or voluntary recall to address this issue. With the apparent sample size of hard start LRS bikes it shouldn't take much for a couple regional service/test engineers to identify the root cause and determine a permanent fix. Could be as simple as a ECU reflash assuming MChad's fix & results are typical for the breed.