Question about 1996 Honda VT 1100 C Shadow Spirit

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I just bought a 96 American Classic with 16,000 mi. it has after market Cobra pipes. the owner told me it was properly jetted for the exhaust. but it backfires like crazy. what should or how can this

Backfires like crazy. It has Cobra Slash pipes. the owner said the carbs were properly jetted to the pipes. PLUS it's way to loud. Is there an aftermarket suppository or something I can cram in the exhaust pipes? thanks for listering

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Isnt it funny that precious owners will tell you the bike ran great when they had it and no problems what so ever? most likely it goes into a lean condition when your throttle is off,, the throttle should be set for a tolerance at the butterfly... sounds like it is shutting too much

Posted on Jan 27, 2015

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The carbs are running lean you need to richen them up and your back firing will stop.

Posted on Apr 16, 2014


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Posted on Jan 02, 2017

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SOURCE: Honda Valkyrie Interstate 1999: 25000 miles Cobra

Stock size for the slow jet is 35. Some guys put in 38's to make them less prone to getting plugged. I would say that you still have gunk in the slow jets. Also turn the pilot screws out 2 1/4turns. If the exhaust pops and you have no exhaust or vacuum leaks turn the pilot screws in 1/4 turn at a time till it goes away.

Did you change the plugs and the air filter? How about checking and or replacing the vacuum lines?

You might try a full bottle of Techron fuel system cleaner in a tank of gas. It may clear the problem up.

I had to clean the jets on my 1999 I/S twice and it's not a fun job.

Hope this helps.


Posted on Oct 14, 2009

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SOURCE: backfiring on deceleration from exhaust pipes

May be running too lean or too rich. Check the color of your plugs, black dry and sooty means they are rich, white with blisters lean.

Posted on Apr 03, 2010

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SOURCE: have an 81 cbx with a hindle exhaust system,

I had a '79 CBX with RC headers which required rejeting after installation. You need to rejet the carbs, start by going up one size on main and pilot jet. Yes, this is pain because you must remove the headers and front engine mount so you can tilt the motor down to remove the carbs. Also check the timing, because after installing headers, it will change. Been there, got the T-shirt.

Posted on May 07, 2010

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SOURCE: I have a 2000 Honda

When you installed the Vance and Hines pipes did you use new gaskets? Popping and backfiring is often caused by leaking copper o-rings in the head to head pipe connection , or head pipe to muffler gasket. Sealing the system will prevent oxygen igniting the unburned fuel in the exhaust pipe. Hopefully , this is all you need to stop the popping.

Posted on Nov 13, 2010

Testimonial: "The pipes were done before I got it but I will certainly check out the gaskets. I appreciate your time. thanks"

  • 123 Answers

SOURCE: my 1100 shadow has a pop like a backfire at idle

I would check spark plugs first then if that does not solve the problem. ( GAP AND SPARK) Then lean the carb out. If you recently moved from a lower or higher altitude place then you will need to have the carbs set right for the place that you are going to be riding. The backfiring is an ignition that happens after the combustion in the motor. The gap in the spark plug could be too small or not existent causing this or its the mixture of fuel/air. This would be my first step for solving this problem. After you try this let me know how it runs...

Posted on Jan 27, 2011

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The pipes on my motorcycle are becoming discolored; What causes this? How do I fix it?

Hi Brian, running on the lean side, exhaust and or intake leaks, exhaust valves not seating properly, retarded timing, and extended periods of high speed driving all contribute to exhaust pipe discoloration. This is another reason why heat shields are installed on pipes to cover normal discoloration. You might be able to slow the process down or halt it completely by increasing main jet size until you achieve a light tan color on your spark plugs. The down side of larger main jets is lower MPG. In the future if you ever install new pipes, there is a commercial product out there called Dyno Kote that can be installed on the inside of the new pipes to greatly reduce bluing. There is also a company named Hard Krome that sells a double walled exhaust system that guarantees pipes and mufflers not too blue. Finally, there is a commercial product called Blue-Job that can remove bluing if properly applied, but also removes a micro thin layer of chrome, so only use this product once a while. If you have any other questions about exhaust pipe bluing, or any other issues your Electra Glide may be having you can reach me at For more information about your question, please visit the websites below. Good luck and have nice day.
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you might consider the fuel mixture being too rich and that excess gas is getting into the exhaust and exploding there; it could also be that the exhaust valves in your engine are not closing all the way and excess gas is pouring into the exhaust, last is timing...if it is off, the exhaust valve will be off cycle too and might do the same thing...Check it out!

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If the mechanic did not replace the exhaust pipe gaskets in the head or on any connections between the head pipes and the mufflers , the air leaks could be igniting unburned fuel in the exhaust , causing the popping and back firing. Try replacing any gaskets in the exhaust system.
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