Question about 1997 Honda VT 600 C Shadow

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Honda shodow vlx 600 backfiring on deceleration

My honda backfires when i decelerate and also when i am sitting there idle. i heard it could be just adjusting the carbs a/f but i dont want to mess with anything until i know the possibilities. can anyone help?

Posted by Anonymous on

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  • Honda Master
  • 40,868 Answers

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

Posted on Jul 15, 2017

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Posted on Jan 02, 2017

  • 311 Answers

SOURCE: 87 Aspencade 1200 backfires between shifts and

check for leaks around the exhaust headers,mine did what yours is doing,i replaced the copper exhaust seals in the head(exhaust ports),air is getting into your exhaust system and it mixes with the unburnt fuel and ignites causing the backfire,i replaced copper seals(about $2nz each) and problem went away

Posted on Jul 03, 2009

  • 1 Answer

SOURCE: My 1986 Honda shadow backfires on deceleration.

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.

Posted on Oct 30, 2009

  • 635 Answers

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

heimlich
  • 1978 Answers

SOURCE: is popping or backfire normal?

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

johnamyx
  • 108 Answers

SOURCE: VT1100 backfiring: I have cleaned and rebuilt

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.

Posted on Nov 05, 2010

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Your idle mixture is too lean. You can adjust this by locating the mixture screw on the carb(carbs) and turning it counter-clockwise an 1/8th turn at a time. This will not affect running above 1/4 throttle, but will richen your idle circuit and the lean popping on deceleration. If you have misses above 1/4 throttle when accelerating, tou likely have trash in your jets and the carb will need to be removed and thoroughly cleaned.




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Is popping or backfire normal?


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.

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