Question about 2002 Honda VT 750 CD Shadow A.C.E. Deluxe

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Is popping or backfire normal?

Just bought a 2003 shadow and it makes a popping noise on deceleration. Do the carbs need adjusting or is this normal?

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Two things can cause popping or backfiring on deceleration. The most common is air leaking into the exhaust through the exhaust pipe copper o-ring gaskets. This typically happens when the exhaust is replaced without removing the old ones (doubled up) or simply reusing the old gaskets and they don't seal. The other thing that can cause popping is bad air cut diaphragms on the carburetors. If they are old and sticky or have holes in them they don't properly shut off the gas on deceleration causing the backfire.

Posted on May 06, 2010

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Honda shodow vlx 600 backfiring on deceleration


Hi, Anonymous if your carburetor/exhaust is:
COUGHING is usually caused by an air leak in the intake system and will generally have the same telltale signs, a wet or damp build up of oil/gas seepage at the intake manifold to cylinder head or carburetor to intake manifold connection and in rare instances a worn throttle plate shaft and or seals.
POPPING on deceleration is usually caused by a lean fuel condition or an air leak in the exhaust system and is generally located where black carbon soot is seen as a flashing build up from any joint connection. This condition can easily be remedied by removing and cleaning both joint pieces and reassembling with high temp silicone and torquing the exhaust clamp to the proper spec.
SPITTING is usually caused by a faulty accelerator pump and or nozzle, or the float bowl needle and seat leaking and overflowing through the main jet mixing well nozzle, or the air-fuel mixture screw is adjusted too lean.
BACKFIRING is usually caused by a sticky/tight intake valve or a timing issue, 180 degrees out or cam chain off 1or 2 teeth.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Backfiring
Honda shadow exhaust leak backfiring fix
http://www.vt600vlx.com/VLX%20VT600%2097%20and%20up%20Service%20Manual.pdf
http://www.partsfish.com/page/oem-parts-for-honda
Honda VT600C Owner Manual

Jan 08, 2013 | 1997 Honda VT 600 C Shadow

1 Answer

Is loud backfiring a carb problem ?


It could need carb adjust.
If you or someone else adjusted the air/fuel screw on it.
Also altitude change can affect it to a degree.
Also if your ignition timining (when the spark plug sparks) is off.

If it is making the "backfire" sound out the exhaust then it's actually "afterfire"
"Backfire is when it actually makes that noise going out the intake side.
If it does that going out your intake side you probably have a mechanical problem (timing).

Jan 07, 2011 | 2003 Triumph Bonneville America

1 Answer

My 1100 shadow has a pop like a backfire at idle or decelerating , the exhaust has been replaced with longshot pipes and the carbs have been rejeted.


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...

Dec 16, 2010 | 2001 Honda VT 1100 C2 Shadow Sabre

1 Answer

VT1100 backfiring: I have cleaned and rebuilt carbs, changed sparkplugs, checked fuel pump & replaced the filter, still backfiring especially on deceleration. What now? I now suspect coils, timing...


It sounds like a lean backfire. You may need to also clean and adjust the air/fuel mixture screw. It is on the bottom of the carb and is probably covered by a brass plug that you will need to carefully drill out. before you remove it turn it all the way in till it is slightly snug and count the turns so you can put it back to the settings. be careful not to tighten it to tight as you can damage the needle. There is also a o-ring (very small) and a washer also very small in there with the needle and spring. After you clean it and reset it, if it still backfires on decel then turn the screw (it can be done without removing the carbs with a 90 degree screw driver that can be bought at a tool supply) in or out till the backfire stops. be careful to count the turns out as you dont want to go more than 3.5 turns out that would be to far and the screw could fall out. I hope this helps you. Thanks and have a great day.

Nov 05, 2010 | 1998 Honda VT 1100 C Shadow Spirit

2 Answers

I HAVE A KAWASAKI VN 1500 VALCAN 1999. IT BACKFIRES WHEN DECELERATING & CAN'T ADJUST THE IDLE NEED HELP . THANKS JOE


Issue with your Timing Advace need to be re-ajuste Carb need tune up also.. Check Spark Plug for bad performance.. Take a carb calibrator to ajust those Carburator.. nice but Touchy You will get the best performance and you will save much more on gaz...If it persist ..Well your Valve as to be check' Up

Sep 30, 2010 | 1999 kawasaki VN 1500 Vulcan Classic

1 Answer

My 1999 Honda shadow backfires on deceleration after steady throttle what could cause this? I have tuned it and cleaned the carb but it still does it.


The most common reason for backfiring is lack of back pressure from changing the exhaust. To compensate for the flat spot you get you put in a jet kit. This leaves the possibility of more unburned gas getting into the exhaust. Honda uses Kei Hin carbs with a fuel shut off diaphragm to help limit this condition (backfiring) by turning off the fuel to the carbs during deceleration. Even stock exhaust can pop or backfire. Typically it is caused by air getting into the exhaust either past the copper o-ring gaskets in the head or leaking muffler connections from the head pipes to the mufflers. Try replacing all the exhaust gaskets and you should minimize this condition.

Sep 05, 2010 | 1999 Honda VT 750 CD Shadow A.C.E. Deluxe

2 Answers

My 2002 750 ace keeps backfire when I rev it up


did you change the exhaust and air filter? if not, you should. bike is running rich. lean it out a little and you'll be alright.

May 04, 2010 | 2002 Honda VT 750 CD Shadow A.C.E. Deluxe

2 Answers

My 1986 Honda shadow backfires on deceleration. How do I fix it


I replaced spark plugs, filters, tightened boots, etc. Nothing worked. Then I dumped Sea Foam in the gas tank. 50 miles later...no more backfiring. I used 1 ounce per gallon. Get it at any auto parts store.

Oct 21, 2009 | 1988 Honda VT 1100 C Shadow

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