Question about 1994 Ducati 400 SS

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Bike is running on front cylinder only and backfire.

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Check the plug, the gap in the points. Or better still change it. Check if the other cylinder is enough current to produce blue spark. The HT cable may be loose.

Posted on Sep 09, 2010

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Posted on Jan 02, 2017

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1fastbob
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SOURCE: Backfiring through rear cylinder, 45000 on bike

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

Posted on Oct 22, 2009

Testimonial: "we have already replaced both gaskets"

co7196
  • 3433 Answers

SOURCE: bike missing and backfiring... put new plugs in 2001 ace 750

I'm trying to think away the possibility of a burt vave. Have you run the valve adjustment? Carb adjustment is very critical, Too lean will cause backfiring or stumbling and too rich will cause deccel popping at the exhaust. One other thing, Vacuum leaks screw everything up so it wouldn't hurt to ck all the vacuum lines make sure of no cracks or loose fits. Safly, you may need to just run it out and hope for it to clear up.Make sure the plug wires are not laying on anything. Take some electrical spray cleaner and rinse og the top of the coilnd the plug wire. I'll keep thinking on this and if I stumble on anything I'll you know. Ned

Posted on Nov 14, 2009

dmsr63
  • 2050 Answers

SOURCE: My 2002 1100 v star classic does not run on the

How good did you clean the carbs? The idle jets usually have small holes along the side, and if they are blocked with dirt or bad fuel, it won't idle. Make sure ALL of the passages are clear, and all jets are clear, through the center and holes in the sides of the pilot jets.

Posted on Aug 03, 2010

  • 8909 Answers

SOURCE: the front cylinder runs fine

That could be the spark plugs causing the run on. The rear piston runs hotter because it is heated by the front one, so try a cooler plug.

Posted on Mar 06, 2011

  • 6 Answers

SOURCE: Front cylinder of my 1982

If you are sure it is getting a spark; you have pulled the wire and verified spark to plug when plug is grounded to the frame.... Then you should check the carb to be sure it is getting fuel to the bowl. There should be a screw near the bottom of the float bowl; loosen it and watch for fuel to flow out the drain hole. If no fuel flows you can tap lightly on the bowl with handle end of a screwdriver to try and loosen the float shutoff to allow it to fill with gas. If the bike was put up wet or got dirty gas you may have to rebuild/clean the carbs very well to correct the problem. Do be sure to clean up any gas off of engine before letting the engine warm up to keep from having a fire hazard. If gas flows and you have spark it may actually be bad gas or water in gas. For water in gas the easiest thing to do is add a bottle of rubbing alcohol; as close to 100% pure you can get. The alcohol will mix with the water and you will get less sputtering and missing while you run the tank thru.

Posted on May 11, 2011

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If carb looks like an leak at the Oring manifold .Try to start and spray any carb cleaner to the manifold close to the cylinder ,.any change on idle would be an air leak!

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The front cylinder runs fine but the rear cylinder pops and backfires, sometimes the rear cylinder will backfire after the engine is turned off, what can i do to fix this.


That could be the spark plugs causing the run on. The rear piston runs hotter because it is heated by the front one, so try a cooler plug.

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I am getting pre-ingition knock when I throttle fast and front exhaust pipe is turning blue. Also backfires when letting off throttle. Only 8,000 miles


Backfiring when slowing down is usually caused by leaking exhaust gaskets in the head, or head pipe to muffler connection. A lean condition on the front cylinder could be dirt in the carburetor. Although the bluing in the pipe could be caused by unburned fuel from a malfunctioning choke mechanism on the front carburetor or leaving the choke on too long. Often the the pinging is caused by ethanol in the fuel you are using. Your bike should be designed to run on 87 Octane regular unleaded style gas. If you have non-ethanol style fuel available in your area , I would run a tank of non-ethanol fuel with a dose of Chevron Techron fuel system cleaner in the tank. Inspect the choke mechanism is working correctly and replace your exhaust gaskets.

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Bike missing and backfiring... put new plugs in 2001 ace 750


I'm trying to think away the possibility of a burt vave. Have you run the valve adjustment? Carb adjustment is very critical, Too lean will cause backfiring or stumbling and too rich will cause deccel popping at the exhaust. One other thing, Vacuum leaks screw everything up so it wouldn't hurt to ck all the vacuum lines make sure of no cracks or loose fits. Safly, you may need to just run it out and hope for it to clear up.Make sure the plug wires are not laying on anything. Take some electrical spray cleaner and rinse og the top of the coilnd the plug wire. I'll keep thinking on this and if I stumble on anything I'll you know. Ned

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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

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.

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Bike backfires constantly on decelleration


i would recommend you to get the cylinder pressure checked.

Jul 12, 2009 | 2001 Yamaha V Star 1100 Classic

1 Answer

Vn800 running fast on tickover


I am not sure what you mean on the "running fast" statement. If idle speed then turn the idle screw outward to slow down the idle.

The backfire is caused by turning off the ignition key when the bike is at high revs. let it idle down THEN turn it off. The backfire is there because the carb idle circuit is active anytime the piston is in motion. Gas goes into the cylinder as the bike revs down then a hot spot in the exhaust pipe finally ignites the built up gas. There is your backfire.

Is the running fast question answered? Give me more information on the problem if it isn't.

Please rate this answer. Thanks njv6!

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1 Answer

Gas flooding cylinder


i would pull your carbs, clean them and look for wear on your diaphrams and check your floats.

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