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Backfires the bike backfires from carb and exhaust when given throttle

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To much air when mixing with fuel in carb find air mixtur screw on carb an whale running turn in slowley till it stops backfiring turning the screw in adjusts the air mixing with fuel the screw is useuly located on the side of the carb witch the toub hooked up to put fuel in carb is
or you could re set it by screwing all the way in then screwing out 3 whole turns then whale running turn out til it back fires then turn screw in haf to three quarters of a turn in hope this helps

Posted on Nov 28, 2012

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Posted on Jan 02, 2017

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SOURCE: 1984 GL1200 Goldwing... 80k mi.

This sounds like a fuel flow problem. I suggest removing and rebuilding and cleaning the entire system, meaning Carbs, filters and strainers in the tank. Old fuel turns to gel, and floats absorb fuel, sometimes, so inspedt everything. When finished set carbs with carb sticks, both at idle and at 2000 RPM, using hand throttle.

Posted on Oct 26, 2010

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SOURCE: 2003 yzf450 wont run right?

recheck pilot jet & pilot circuit.also check compression

Posted on Feb 16, 2009

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SOURCE: honda 1300c backfire through carb at wide open

Try balancing ans syncronising the carbs.
BALANCE THE CARBS
Turn the throttle screw on the LEFT carb one half turn inward. Now start the engine and get it warmed up. With the engine running, remove the RIGHT spark plug wire. Adjust the idle speed on the left carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

Now turn the throttle screw on the RIGHT carb one half turn inward. Restart and rev the engine. Next, remove the LEFT spark plug wire. Adjust the idle speed on the right carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

Turn the idle screw on each carb EXACTLY ONE QUARTER turn outward and restart the engine. The engine will be probably be idling very fast. Adjust both the idle screws equally from this point to get to the desired idle speed.

SYNCHRONIZE THE CARBS
Remove the air filter and rubber fittings to allow you to see into the throat of both carbs. You may need a mirror to see inside. You need to be able to see the slides go up and down when you twist the throttle. Now turn the fitting where the cable goes into each carb such that there is just a bit of slack in the cable, 1/16" is plenty. Lock ONE of the cable adjusters down tight. All further adjustments will be made on the other carb.

With the motor turned off twist the throttle very slowly while looking at the slides. Both slides need to begin lifting at the exact same moment. If the slides don't raise at the exact same time then slowly twist the throttle until the locked adjuster slide just barely starts to move. Hold the throttle still and turn the adjuster on the other carb so that the slide on that carb just barely starts to move also. Now recheck the slide movement timing. Do this process until the slides on both carbs begin to raise at the EXACT same moment. Lock down the loose adjuster and re-check the slides.

Please rate this solution. Thanks!

Posted on Mar 30, 2009

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SOURCE: Bike is backfiring through carb.

do u have the correct spark plug the one recommended by the manufacturer

Posted on Aug 02, 2009

sisadsl
  • 1508 Answers

SOURCE: I have a 2002 Buell Blast that runs rough after

check valve clearances, and low voltage can cause backfire, battery voltage should rise when revved, use a digital multy meter

Posted on Apr 04, 2010

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1 Answer

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1984 GL1200 Goldwing... 80k mi. ....bike will not run without choke on 1/4 to 1/2 open... when given throttle, the engine backfires and blows black soot out of exhaust... new spark plugs with gap set at...


This sounds like a fuel flow problem. I suggest removing and rebuilding and cleaning the entire system, meaning Carbs, filters and strainers in the tank. Old fuel turns to gel, and floats absorb fuel, sometimes, so inspedt everything. When finished set carbs with carb sticks, both at idle and at 2000 RPM, using hand throttle.

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I have gas leaking from a hose that is protruding from the bottom of my 1998 Suzuki Savage 650 LS. It is backfiring a lot and I was told this was due to the Jardine exhaust system that is installed. ...


do u mean gas as in petrol??if it is petrol...then its leaking from the carbs..as this id the overflow pipe!!..if thats the case..then it sounds like the carbs may need cleaning. as they may be some muck in there thats stoping the floats from shuting.(carnt shut so overflows!!) this could make the bike backfire as still petrol going to engine when carbs shut so backsfire..or the back fire could be from the new exhaust .if its not seal'ed right on the manifolds it sucks air in & can make them pop & backfire when you shut the throttle(like when u shut throttle when coming up to a stop)....hope this helps...Howard

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I had a high performance pipe on my bike, it got damaged, put stock pipe back on and it ran fine for a couple of months, it started to backfire at idle and with throttle off but still had plenty of power. ...


I would take a close look at the valves, if you are sure the carb is entirely clean. (Accelerator pump and everything)
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1995 honda xr 600r has been backfireing upon acceleration


Are you talking about "backfiring" out the exhaust or "spitting back" through the carb?

Backfiring through the exhaust under acceleration is rare. If he ignition is misfiring, unburned fuel and air mixture is exhausted into the exhaust system. The next time the plug fires, it ignites this mixure. In other words, your engine is "missing" and your ignition system needs attention.

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