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I have a 1977 400t honda motor cycle that wont run on both cylinders at idle it has good spark exhaust pops and backfires what could be causing this?

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  • Honda Master
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Indicates an intake leak
check inlet manifold gaskets , carby mounts and gaskets
check any vacuum hoses

Posted on May 19, 2017

Testimonial: "Tried all you suggested no avail .left hand cyclinder will not fire untill 3000 revs carbys have been sonic blasted bench setup could this be idle jet .thanks"

  • Bill Boyd May 19, 2017

    possible
    have that carby overhauled and have the float level checked

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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.
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Jan 08, 2013 | 1997 Honda VT 600 C Shadow

1 Answer

1985 Goldwing, 1 cylinder is popping at idle when bike is cold


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 buildup 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.
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Honda GL1200D Shop Manual
http://www.partsfish.com/page/oem-parts-for-honda
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Sep 28, 2012 | 1985 Honda GL 1200 Aspencade Gold Wing

1 Answer

SUZUKI 2005 DR650SE DUAL SPORT RUNS GREAT BUT AT IDLE THERE IS A SLIGHT POPPING IN IDLE RYTHYM, ALSO BACKFIRES SLIGHTLY WHEN DOWNSHIFTING...HELP


Carefully check your intake manifold for leaks, cracks, separation. An air leak on the intake side between the carburetor and the cylinder head would be the cause of popping on the intake side. If there are leaks in the exhaust system, an o-ring seal in the head, or a seal between the head pipe and the muffler, this can cause popping or backfiring in the exhaust.

Feb 25, 2011 | 2005 Suzuki DR 650 SE

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

2 Answers

Back fires 24/7?????????????????


Backfiring can be caused by fouled spark plugs (you have four,two per cylinder), bad spark plug caps, bad air cut valves on the side of the carburetors, but most likely leaking exhaust gaskets. I am guessing that you have changed the exhaust system but did not put new crush o-rings between the cylinder head and the head pipe. You should also change the tubular gasket/seals between the head pipes and the mufflers. If this does not fix the problem , take out the two screws that hold the air cut diaphragms in place and remove the covers . If the rubber diaphragms have holes in them or have become sticky they need to be replaced. Air cut diaphragms turn off the fuel during deceleration to prevent back firing. If they go bad they can cause poor running , popping , and back firing during normal operation.

Nov 13, 2010 | 2005 Honda VT 1100 C2 Shadow Sabre

1 Answer

I have a 2000 Honda VT1100 Sabre Shadow. It's got aftermarket Vance and Hines pipes. It continues to have a backfire when moving up through the gears. I've had the jets (and K&N filter and plugs)...


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.

Nov 13, 2010 | Honda VT 1100 C Shadow Motorcycles

1 Answer

2007 Honda Shadow Spirit VT1100c exhaust leak at cylinder head and it backfires


Hi, Ltbuerkle #8 looks good and the usual suspects are:
1. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage check for spark leakage in the dark.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
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.
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Honda shadow vt1100 Owners Workshop Manual
http://www.partsfish.com/page/oem-parts-for-honda
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Oct 11, 2010 | 2005 Honda VT 1100 C Shadow Spirit

1 Answer

When at idle it shuts off and while down shifting it backfires


You may be experiencing ethanol fuel , it can lower your idle. Use the idle adjust screw on the carburetors to raise the isle enough it wont kill. If the carbs are dirty use a fuel system cleaner in the tank like Chevron Techron to clean the varnish/gum out of the carbs. Backfiring is caused by air leaks in the exhaust system , usually the copper o-rings in the exhaust port where the pipe plugs into the head. Sometimes a bad gasket between the head pipe and the muffler is the cause of the backfire. When exhaust systems are replaced the gaskets are often reused , when they fail you get air leaks that cause popping and backfiring.

Aug 27, 2010 | 2000 Honda VT 1100 C Shadow Spirit

2 Answers

Backfiring through rear cylinder, 45000 on bike but runs great, no loss of power, just backfiring


Check to see if you have an exhaust leak at the rear cylinder. A slightly leaking exhaust gasket can cause this.

Oct 22, 2009 | 2005 Honda VTX 1300 C

1 Answer

Backfire after shutoff


With the key off and the engine "running down", the idle circuit fuel is still going to into each cylinder then out the exhaust. A hot spot in the exhaust can ignite the unburned fuel creating an explosion, ( backfire ). Let the engine run down to an idle THEN turn the key off.

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Mar 31, 2009 | 2006 Yamaha Road Star

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