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Backfires the bike backfires from carb and exhaust when given throttle

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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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trenton_fabe
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SOURCE: backfires

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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1 Answer

How do I stop my bike from constant backfiring?


its running lean. Could be a vent problem with the gas tank. try running with the gas lid slightly open.. if this doesn't work increase the jet size in the carbs.

Mar 21, 2016 | Motorcycles

1 Answer

Why does a 2002 buell blast backfire through the carb when given throttle?


Hi, Anonymous popping on deceleration is usually caused by 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 the correct torque applied to the exhaust clamps where present. Coughing is usually caused by an air leak in the intake system and will generally have the same telltale signs of location by a wet or damp buildup of oil/gas seepage at the intake manifold to cylinder head or carburetor connection and in rare instances a worn throttle plate shaft and or seals. 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 set to lean. For more information about your issue and free downloads that you need please visit the websites below, and for specific information or questions, please feel free to contact me at xlch@mail.com. Good luck and have a nice day. http://www.badweatherbikers.com/buell/messages/20164/150578.html?1444533833
Thread What it mean when bike backfires through the carb
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May 16, 2014 | 2002 Buell Blast

1 Answer

Backfiring and trouble starting


If you change the exhaust pipes, you have to sync the carbs (if you cant sync them, you have to change the carb jets), usually it is backfiring because the carbs are not in balance.

May 18, 2013 | 1996 Honda VT 600 C Shadow

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

Backfires


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

Nov 27, 2012 | 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.
Backfiring
Backfire through the carb
Honda VT600C Shadow VLX Service Manual
https://www.partsfish.com/page/oem-parts-for-honda
Honda VT600C Owner Manual

Apr 10, 2012 | 2005 Honda VT 600 CD Shadow

1 Answer

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.

Oct 26, 2010 | 1984 Honda GL 1200 Aspencade Gold Wing

2 Answers

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

Jan 05, 2010 | Suzuki LS 650 Savage Motorcycles

1 Answer

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)
A closed up exhaust can harm an exhaust valve.
Start with a compression test.
Good spark?
Is the plug wet?

Nov 24, 2009 | Yamaha YZ 250 F Motorcycles

1 Answer

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.

If it's "spitting back" out of the carb, this is usually an indication of a lean mixture. If it's doing it at wide open throttle, you might need to go up one size one your main jet. If it's doing it under less than full throttle acceleration, raise your needle up one notch and try it again. You want to richen the mixture just a bit. Too much and the bike will get sluggish.

Oct 10, 2009 | 1995 Honda XR 600 R

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