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Tractor starts but when accelerating throttle it backfires thru exhaust

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Check the key in the flywheel would bet it's partly sheared .makes timing just a bit off Or the valves need regapped

Posted on Apr 26, 2015

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Or the valve seat is falling out or loose

Posted on Apr 26, 2015

  • ray gallant Apr 26, 2015

    that too possibly

  •  johnny rebel
    johnny rebel Apr 26, 2015

    that happened to me on alot of craftsman and poulan tractors

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1 Answer

Won't start backfires thru carb.


Hi, Kelly if your carburetor 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 buildup 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.
Good luck and have a wonderful day.

May 26, 2017 | Motorcycles

1 Answer

Why my TVS Victor Glx bike misfire on breaks application or de accelerated .Mileage is around 30.Spark plug is replaced,regular service is done.it's accelerate a lot when fuel is going to finish.Help


Hi, Anonymous popping or backfiring 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. Coughing is usually caused by an air leak in the intake system and will generally have the same telltale signs, a wet or damp buildup 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. 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. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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2 Answers

Backfire through the exaust and hessitation


Backfire is the result of unburned fuel in the exhaust igniting. I would look at the timing. Could be out enough for this to be the cause. Good starting point in my opinion. Not usually a plug issue.

Aug 04, 2017 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Engine starts then backfires and sometimes leaks gas on exhaust


IS it leaking gas on the exhaust or thru the exhaust. I have seen the float in the carb stick in the down or fill position and flood thru the exhaust.

Sep 04, 2013 | Craftsman 24 Hp 48" Deck Yard Tractor

2 Answers

Hesitating on acceleration, also backfiring when taking your foot off the accelerator,approaching a junction.sometimes it will just cut out. if i turn the ignition off and restart it will be ok for about a...


Sounds like a vacuum leak in the motor. Backfiring may be its own problem altogether. Backfiring only occurs when cold air is being introduced into a hot exhaust stream or when the timing is off. Check for vacuum leaks under the hood and leaks in your exhaust. If you have a leak in your exhaust it could be interfearing with your emission sensors and giving your motor false information.

Feb 20, 2010 | 1999 Volkswagen Golf

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

Motor backfires when you slow down to go around when you start to accelerate sometimes it will backfire


Your main problem could be anything from Timimg out by 2mm
problem with hole in exhaust system ,,or a gasket blown on the intake.
To much fuel getting in the engine and as you throttle back the extra fuel in the chambers fire without a spark.. with the heat of pistons
The way to check the exhaust is get someone to listen to the engine in park and you put on a glove and put your hand over the tail pipe and if the engine stops and cannot hear a whistle under the bonnet then the exhaust is ok
Let me know how you get on ASAP Ron

Nov 02, 2009 | 2005 Ford Futura

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

1 Answer

I reasembled a 650 vtwin 0n 4 wheeler ,it starts


recheck the timing, valve and ignition both.

Sep 06, 2009 | 1985 kawasaki Z 650

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