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Exhaust backfires when running. and feels like choking

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Not enough details like make , model , year , type of equipment etc to even guess

Posted on May 16, 2017

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I have a 1998 shadow spirit 1100 i replaced the choke cable on it now it seems not to be running correct i hear a slight backfire from the exhaust on the back cylinder i checked the adjustment twice &...


The popping or backfiring is caused by air leaks in the exhaust system and unburned fuel igniting. Try replacing the copper crush o-rings between the head pipe and the head. Seal the air leak and the popping should stop. You can have an exhaust leak start any time any where. Many times exhaust systems are replaced and the gaskets are not replaced causing the popping issues.

Feb 04, 2011 | Honda VT 1100 C Motorcycles

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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.

Nov 03, 2010 | 2004 Yamaha V Star Silverado

1 Answer

03 beartraker engine pipe getting cherry red and backfiring it also is only running only at full or partial choke


You need to disassemble and clean your carburetor. Make sure the jets and carb body passageways are clean and clear. Unburned fuel from running the cycle on choke is burning in your exhaust pipe.

Oct 29, 2010 | 2002 Yamaha TT-R 250

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04 yz 450 backfires and is hard to start when is cold runs better with choke on


Runs better with choke means the mixture is lean,
Has the exhaust been changed.?
Did this problem just begin.?
Check for air leaks on intake manifold.
Clean carb.
Check valve clearances
raise the needle jet one notch
one size up in the main jet.

check one item at a time, and write notes about jetting changes.and improvements
I also run Moreys upper cylnder lube, helps starting hot or cold, and helps stop "cough stopping" with heavy rear brake use

May 20, 2010 | 2004 Yamaha YZ 450 F

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Running terible


for one thing the cabureter need rebuilding, and the choke repaired, fix that exhaust leak, most of what you describe relates to fuel, also run some combustion cleaner through the engine, its been running rich and there are deposits causin dieseling when you shut it off, all of this is easy for an older mechanic

May 11, 2010 | 1986 GMC K2500

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

Backfiring


the choke may be sticking and engine is not getting enough fuel when cold. it might be gummed up. i would suggest to remove carb, clean bowl and de-gunk it. (yellow tar)

Jul 17, 2009 | Harley Davidson FXST - FXSTI Softail...

1 Answer

Runs good til it gets hot, then backfires and sputters


Have the catalitic converter check sounds like it may be clogged. This will cause it to choke off exhaust when it gets hot

Jun 11, 2009 | 1998 Chevrolet K1500

2 Answers

Backfiring, flames coming out of exhaust and cutting out


Sounds to be a timing problem or burnt exhaust valve.. A compression test will tell the story.

Jun 02, 2009 | 2000 Suzuki VL 250 Intruder LC

1 Answer

Backfire


Backfires are when fuel travels through the cylinders without combusting then explodes in the exhaust pipe. Fuel supply/combustion issue. It seems likely there's a problem either with the mix going into the cylinders (carbs fuel lines or air intake), or with timing. These can affect a bike at particular speeds and throttle positions. If using the choke has helped at some point that's a further indication (the choke changes the gas/air mix). ,,,

Nov 10, 2008 | 2000 Husaberg Fe 400

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