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Exhaust backfire Backfire through exhaust on high rpm what would cause that

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Posted on Jan 02, 2017

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SOURCE: Backfire - Husqvarna YTH20K46

I find my 2148 runs much happier on the medium grade shell than on the cheaper gas. I did have a nasty POW, which resulted in bent pushrods, or perhaps the bent pushrods caused the POW. After replacing the pushrods, and adjusting same, the backfiring stopped altogether. knock on wood. The 21 is a B&S engine which has a propensity to the bent pushrods. Fortunately for me, my neighbor is a wiz at those fine adjustments.

Posted on Mar 24, 2010

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Why does my trx200sx backfire when I let off throttle it just started this


Dennis, Maybe try changing your plugs, unburnt fuel may be getting in exhaust because of weak plug.. Read the following links, very informative in telling causes of and some suggested fixes on backfiring. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
http://www.rcramer.com/shop/backfire.html

Exhaust backfire popping when letting off throttle Motorcycle Forum

What causes bikes engine to backfire Intake Jetting Fuel Injection

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Back fires rich exhaust


Preventing Backfire on Motorcycle Exhausts ' DoItYourself ...

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When the engine on your motorcycle has an emission system malfunction, such as anexhaust leak or a moment of running rich or running lean, backfire can ...

Exhaust backfire, popping when letting off throttle - Motorcycle Forum

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Is backfire when decelerating a bad thing? : motorcycles


Jan 31, 2016 | Motorcycles

1 Answer

What causes the motor to backfire thru the exhaust? When I adjust the timing the carborator backfires?


Backfire through carb is timing too far advanced.
Backfire through exhaust is timing too retarded.

May 17, 2015 | Motorcycles

1 Answer

Backfire on deacceleration


Get the fueling set up on a rolling road. Honda set the fuelling to suit the Emissions and the Exhaust they fitted.An after market exhaust will usually have less backpressure and need a set up. When you say backfire, do you mean a great big bang or just a little popping sound from the exhaust? If it is the latter, it isn't a massive problem but a set up will cure it. A Big Bang could be a cause for concern as it means the ignition is taking place when the Exhaust valve is open and firing in the exhaust itself. This will give a drop in performance and may cause the engine and exhaust to fail.

Apr 06, 2013 | 2005 Honda VTX 1300 R

1 Answer

Hi I'm new to this site , I have been asked to close Q I have asked already but don't know how on my iPhone to close then please help


There are two kinds of backfires, one is produced from the engine air intake and the other is produced from the tail pipe of the exhaust system. The cause for a backfire condition can vary depending on the malfunction of a particular system. Some backfires can be extreme enough to cause damage to related components. Anytime a backfire is observed immediately diagnose and repair as needed. If the engine is running rough it can produce a backfire. A backfire occurs when there is an imbalance in the air to fuel ratio required for your vehicle to operate properly. If the fuel mixture is too lean (not enough fuel) you may have a backfire in the intake manifold gasket, or too rich (too much fuel) you may get a backfire out of the exhaust system. It is important to observe the location of the backfire.

Oct 10, 2012 | Cars & Trucks

1 Answer

2007 yamaha yz450f... while riding last week it was backfiring on deceleration. it blew a 5 inch hole in the header pipe. i purchased a new one, cleaned the air filter, changed the oil and put a new spark...


Exhaust leaks near the exhaust port can draw air into pipe on deceleration and detonate any unburnt fuel leaving engine, causing backfire and high temps.
An overly lean fuel mixture on the engine can make decel backfire worse too.

Mar 13, 2011 | Yamaha YZ 450 F Motorcycles

4 Answers

Backfire


is it a straight thru exhaust, or is it just a head pipe with nothing attached? If it's just a head pipe, you need to get some sort of muffler on it or you'll burn your valves out from a lean condition. The backfire is due to the vaccum fed carbs that yamaha runs. They work wonderfully, but under heavy deceleration, the vaccum still feeds the bowl, and it builds up excess fuel, which eventually burns off as a backfire. If it were fuel injected, you could have the fuel map adjusted to lean it out under deceleration.

Jun 22, 2010 | 2001 Yamaha V Star 1100 Classic

2 Answers

Just took my VT750 into shop for backfire issues.


I would probably take it back to the mechanic and ask, the high reving could be loose or cracked inlet manifolds or a clamp left loose, this can cause backfire as well as that cylnder runs lean, other causes of back fire are, lean fuel issues, low ignition voltage, leaks in exhaust gasket or exhaust, incorrect valve clearance, just on downshift try manifolds and exhaust first

Apr 23, 2010 | 2003 Honda VT 750 CD Shadow A.C.E. Deluxe

1 Answer

Why does my car backfire


if it is a true backfire, from the exhaust, then this is unburnt fuel in the exhaust that is igniting from the heat in the exhaust

all this means is that you are running too rich which would be likely caused by leaking injectors

Apr 15, 2010 | 1999 Mercury Sable

1 Answer

98Eclipse 2.0 nonTurbo 5speed 180,000 miles ,code PO301


The po301 is a misfire code. The backfire can be caused by a excessive amount of fuel, bad valve timing etc.
My guess is you have damage to an exhaust valve that may have occurred when you had the timing belt problem.A compression test will indicate if you have a leaking exhaust valve.The reason for the backfire is the exhaust valve is still partially open when the spark plug fires.

Jan 03, 2009 | 1998 Mitsubishi Eclipse

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