Question about 2005 Honda CB 750

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Bike backfires the bike is backfiring with black smoke I cleaned caebs the exhaust is 4 into one

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Make sure to check all plugs, plug wires, and plug cap connections. Look at plug condition, that can tell you a LOT about each cylinder.

Posted on Jun 29, 2014

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Posted on Jan 02, 2017

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SOURCE: 2006 honda shadow sabre backfires

valves need to be adjusted every 6000 miles your way past due also your carbs need to be in sync together a shop has to do this work

Posted on Dec 28, 2008

firenut119
  • 66 Answers

SOURCE: crf 150f backfire

change the jetting...youcan contact FMF for thier setup recommendations for running that pipe with the bike...very common problem and jetting will take care of alot of the issue

Posted on May 03, 2009

  • 4088 Answers

SOURCE: Backfiring through rear cylinder, 45000 on bike

A sticking intake valve or weak valve spring may also cause this problem. Check the intake manifold connection for tightness. Try another spark plug.

Posted on Oct 23, 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

Testimonial: "Thank you for your suggestion, it might be that simple. You know you always go for the worst first. Thanks again and I will check tomorrow. David"

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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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1 Answer

Bike is starting and backfireing,cant give any gas or it will die. this is be couse of lack of gas fro secondary ?


Hi, Michael and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
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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1 Answer

Need help my Busa started to miss backfire a little smoke was only when I changed gears


Gavin, sounds like a bad plug or a coil on its way out.
to show your appreciation press the helpful button and follow me on fixya for more tips and info.

Feb 15, 2016 | 2003 Suzuki GSX 1300 R Hayabusa

2 Answers

Back fires rich exhaust


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1 Answer

Backfire on 2010 flstc?


Backfiring is caused by a lean air/fuel (A/F) ratio. A leaner A/F ratio takes longer to burn and will continue to burn in the exhaust, hence the backfiring. Is the bike stock, or have you changed the air cleaner or pipes? Both of these changes will result in a leaner A/F ratio. HD bikes with fuel injection already run lean to meet emissions requirements, so changing pipes, etc. will make the problem worse. If you have not made any changes to the bike, make sure that the fuel system is clean and you are using good quality gas. You can also have the bike's computer (ECU) remapped to run a little richer. Your dealer may be able to do this for you, or there are aftermarket ECU tuners available for your bike that can adjust the fuel map and ignition. These will give you the added benefit of more power and a cooler running engine.

Apr 24, 2014 | 2010 Harley Davidson FLSTC Heritage...

2 Answers

Backfire, Black smoke from exhaust, spitting and sputtering


If you have not replaced plugs start there A bad map sensor will also cause black smoke and poor running

Feb 15, 2014 | Dodge Durango Cars & Trucks

1 Answer

CB250 is backfiring


Backfire when throttle down can be;
1. dirty carbs that are running lean and need cleaning. Also the rubber grommets that hold the carbs can be leaking at the backside or even dry rotted.
2. no air filter
3. broken or open vacuum lines
4. an aftermarket exhaust that needs rejetting or an open exhaust system

Dec 15, 2012 | Honda CB 250 Nighthawk Motorcycles

1 Answer

Single cylinder yanmar diesel engine on log splitter back fires out of exhuast & blows out black smoke


Engines runs for a couple of seconds then loudly backfires with a flash of flame out of the exhaust followed by a plume of black smoke. Then runs sort of ok for a couple of seconds then repeats the backfire again AmanStino Lightning Cable Apple MFi Certified 1M Nylon Braided Charging...

Apr 21, 2012 | Cars & Trucks

1 Answer

Motorbikes backfires, and is irratic with accelration.


Nice bike and an annoying issue. Backfire is unburnt fuel that then detonates.

Hopefully, it's just a plug going bad. Pull the plugs and see which one is black/wet. That will be the tell tale sign which cylinder is acting up.

I'd replace all, set the proper gap and install them and take it for a test drive.

Good luck hope this is a simple fix.

Oct 05, 2009 | 2000 Triumph Trophy 900

1 Answer

2003 dodge 2500 diesel backfires and destroys


Well, usually when a proper running vehicle backfires through the exhaust its caused by an excess in fuel building up in the pipe and igniting. Some newer diesle trucks will spray fuel into the exhaust to clean the emissions and reduce smoke coming out of the tail pipe. You could have a bent or sticking valve that is allowing extra fuel out into the exhaust, or when it went to clean the exhaust (If your model does that) the exhaust might not have been hot enough to ignite the fuel until you put a load on it causing the exhaust temp to jump igniting all the fuel in the tail pipe.

Jul 17, 2009 | 2001 Dodge Ram 2500 Truck

2 Answers

Bike stalls in high gears when cruising around 45-50MPH


Could be your spark plugs, or maybe your side stand as some bikes if not all of them now have a switch on the side stand which prevents the rider from starting the bike if the stand is extended. So if the spring which retracts the stand is slightly lose, it pulls on the switch and cuts off power. Im not an expert but just check these.

Could also be that your carbs are dirty. So just give them a bit of a service and check for any blockages in there.

Mar 27, 2009 | 1996 Suzuki LS 650 Savage

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