Question about 1995 Honda VT 1100 C Shadow Spirit

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Backfiring through the carbs

Bike is hard to start. rear cylinder is misfiring and backfiring through the carb. Can pull the rear plug on the intake side and it stops misfiring. There appears to be no way to adjust timing or valves on this particular model. Any help will be greatly appreciated. Thanks.

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Can pull the rear plug on the intake side and it stops misfiring ?????
You have 2 plugs - so, which one ?
But first, sync the carbs, change plugs, check the plug wires for short cut, check if rear and front spark plugs have the same colour.

Posted on Feb 02, 2015


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Posted on Jan 02, 2017

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May be a decompression problem. What gear do you use when you pull it?

Posted on Apr 30, 2009

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SOURCE: backfiring through rear cyclinder

Check the wiring to the spark plugs and replace if necessary.If that does not solve then go one step further backwards towards cdi etc...

Posted on Nov 05, 2009

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After changing the spark plugs, and riding the bike for about10 minutes, I heard a back fire , and the bike started smoking, and gasoline leaking throught the tail pipes.

When you drove it for 10 minutes did it work & run perfect without any missing? One cylinder possibly started missing backfired and then maybe the carb flooded some how. I would pull both plugs first. Have a look at the plugs, then you will be able to tell which one was missing (wet with fuel). Check compression on each cylinder and then check the carb. I hope this helps.

Jul 11, 2015 | 2002 Suzuki VS 800 Intruder

1 Answer

Had carbs rebuilt and suppose synced but bike starts hard and when running backfires whin you let off the throttle

1. choke circuits still plugged up or carbs not cleaned correctly; most people that attempt to clean their own carbs do not have the proper equipment to do it with. Most carbs have really small orifice(jets) and require really small jet drills/orifice cleaners to clear them out. Cleaning them in a caustic soak tank will clean them out but the carbs must be taken completely apart or it will damage any gaskets or rubbers parts left in it. Carb cleaning should be left to professionals unless one has experience doing it.

2. Open/broken vacuum lines can make it hard to start and backfire when letting off the throttle; jets that are not cleaned out correctly can also make it backfire.

3. If the backside of the inlet grommets are not sealed at the flange and have a vacuum leak, that will cause hard starting and backfire also; this applies to carbs with a flange style grommet. If the intake grommets are cracked or leaking it too will cause hard starting and backfire. Remove the carbs, wipe the head and mating flange surfaces with laquer thinner, let it dry and then reseal the grommets back to the head with rtv silicone rubber. Make sure to wipe any excess rtv(before it drys) from down inside the port before putting the carbs back on.

Feb 20, 2013 | Honda F6 C Valkyrie Motorcycles

2 Answers

2002 Kawasaki Ninja ZX6R after sitting for a month bike would not start. Got it to start changed spark plugs cleaned Carbs. Bike starts and revs nice. on first gear bike runs great, once in second gear...

Any one of these could be cause of your problem. Sounds like maybe a spark plug coils is bad. Did you gap the plugs? Also sound like secondary fuel injectors not opening fully, and air leaks inbetween intake boots and head. Start bike and let idle Use non-chlorinated brake cleaner spray small squirt on each intake boot find the leak when the bike idles up there is a leak. You can't properly sync multiple carbs if there is even one vacuum or intake leak. Take out spark plugs keep them in their own same cylinders. Read the plugs what do they tell you. Google how to read a spark plug.

Oct 10, 2017 | Motorcycles

1 Answer

2005 Honda Shadow VT600CD backfires through the carburetor

Hi, Donnie if your carburetor or 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 for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Backfire through the carb
Honda VT600C Shadow VLX Service Manual
Honda VT600C Owner Manual

Apr 10, 2012 | 2005 Honda VT 600 CD Shadow

3 Answers

Front cylinder misfire at idle,then raise rpm's to 2000 area an it comes in an out popping thru exhaust.front cylinder cold to the touch when rear is hot, till it runs a couple of min. New plugs, good...

I am not sure if the bike is a 650 or 1100 but in either case it sounds like a fuel issue or and air leak. When the carbs were off for re-jetting did they get cleaned? The slow circuit controls to about 2000 rpm and it sounds similar to your problem.

The first thing to look at is the carb synchronization. If the front cylinder is lagging, it can give the same symptoms. I do not think that the exhaust is a factor because the front is cold when running.

Spray some WD 40 at all the intake manifold area when the bike is running and see if the idle changes. the idle will change and push some smoke out of the exhast if the intake is leaking.

If both of these check good I would pull the carbs back off and clean the slow circuits out completely. This is delicate work and shoud be done by and experienced tech.

If I can help some more just send message.

I hope that his helps. Steve

Jan 18, 2011 | 2004 Yamaha V Star Classic

1 Answer

Bike sits a lot,Hard to start, will only continue to run with choke on. Bike backfires alot.

You need to clean your carburetors. The ethanol that is in gasoline turns to an orange colored film
and it clogs the jets. The prevention for this seems to be seafoam added to your gasoline after your carbs are clean.
It does work. If your bike sits a lot, i would also suggest that you start it up weekly and let it warm up. Sitting is the worse thing for gasoline.
Judging from your description and other problems, the backfire is probably bad gas not burning and igniting in the cylinder when overloaded with gas.
A good carb cleaning, consists of taking the carbs off the bike, taking out all the jets and soaking everything in a good carb solution.
I would start with the carb cleaning, drain the old gas out of the tank, start with fresh 93 octane and add the recommended dose of seafoam listed on the back of the botlle to your gasoline.
Put a set of new spark plugs in it, and fire it up.
Your back fire should be gone as well.

Nov 29, 2010 | 2004 Yamaha V Star 1100 Classic

1 Answer

Left carb backfiring thru carb after it warm up

The carbs are probably out of sync. Set the carbs so that both slides crack open at exactly the same moment. Next, balance the carbs by disconnecting one spark plug then turning the throttle screw on the runing carb to a slower and slower rpm until the bike stops idling on one cylinder. Now reconnect that plug and disconnect the other. Do the same thing to the point the engine dies trying to run on one cylinder. Now start the bike up with both sparkplugs in place. The idle speed will be high, but now the carbs are in balance. Turn each throttle screw down in equal portions until proper idle speed is attained. It would be a good idea to set the valve lash also. If the backfire continues, chances are the valves need to be re-seated. Re-sync and balance the carbs after the valve re-seating. Please rate my answer. Thanks.

Aug 15, 2010 | 1975 Moto Guzzi 850 T 3

1 Answer

My bike will not idle unless the choke is on just a little. i have 2000 1100 v star clasic

I had the same problem with my 2000 V Star 1100. It started out like yours, only running with the choke on a little bit. It got progressively worse. Turned out to be cracked rubber intake manifolds that join the carbs to the cylinders. It happens as your bike gets older. My rear manifold failed first, then six months later, the front one. Mine was bad enough that the bike quit firing on the front cylinder. You may have to take the carbs off to be certain, mine had failed on the inside around the vacuum port. It causes a loss of vacuum resulting in fuel not being pulled into the cylinder from the carb. It's not a hard job, just a pain ! If it hasn't happened already, look for your voltage regulator to fail as well. :o) Hope this helps, Geno

Apr 15, 2010 | 2001 Yamaha V Star 1100 Classic

2 Answers

My suzuki intruder is missing backfiring on the

Did you sync the two carbs? If not the rear may be getting all the gas from the rear carb and none to the front. Twist throttle engine off and see if front carb cable is pulling the carb open.
Also unscrew the spark plug boot from the front spark plug wire and trim 1/8th inch off the wire and screw the boot back in. The plug wire end may be corroded on that wire.

Feb 05, 2010 | 2004 Suzuki VS 1400 Intruder

1 Answer

Bike is sometimes hard to start.When bike stalls and goes dead,it is hard to start again.This is a 2003 honda crf450.

There is a proper way to start the engine. Four controls are on your bike to assist in starting.
  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

Jun 28, 2009 | 2003 Honda CRF 450 R

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