Backfire Problem
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6th Gear
Joined: Oct 2006
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Backfire Problem
As some of you have seen, I am a new member as well as a new H-D rider. I recently purchased a 2003 Superglide. It has 1376 miles on it. It seems basically stock with the exception of Python pipes. It runs great with the exception of backfiring at times. I have been told that by different people that I need to replace the plugs, rejet the carb, get the carb adjusted and lastly to get a full tune up done. None of these people were seasoned H-D riders or mechanics. What is most likely my problem here or is it just something that I have to live with?
Thanks,
Trent
Thanks,
Trent
Intermediate
Joined: Jun 2006
Posts: 27
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RE: Backfire Problem
Well................first of all, the things you stated that they said need to be done "IS" a full tune. You can't really "tune up" a stock harley other than changing the plugs. The "Harley Cough" has been widely expounded upon in several different forums. A search will uncover a thousand suggestions but the summary is............you need to bump up your "Slow Jet", drill out the plug covering your mixture needle and richen it up a bit. 2.5 turns from bottomed is a good start. From there you just need to play with it until you get the right mix of jets and needle to make her stop. It's a labor of love really.
r/ George
r/ George
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6th Gear
Joined: Oct 2006
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RE: Backfire Problem
I guess someone is trying to take advantage of my newness to motorcycle mechanics. I just talked to a mechanic at the local Harley shop and they told me to bring it in to be re jetted also. Thanks for the info.
Trent
Trent
Road Warrior
Joined: Feb 2006
Posts: 1,281
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RE: Backfire Problem
Your problem could be the pipes, do they have baffles in them?
I would also check over the carb jetting like mentioned above, it sounds as if the jetting is off. Here's a post in the DIY section that will show you what to do.
https://www.hdforums.com/m_342514/tm.htm
I would also check over the carb jetting like mentioned above, it sounds as if the jetting is off. Here's a post in the DIY section that will show you what to do.
https://www.hdforums.com/m_342514/tm.htm
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