Question about BARKER ATV Inframe Exhaust System - 2006-11 Yamaha YFM700 Raptor

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I have a 06 raptor 700 trinity stage iv kit exhaust programmer on filter , it shoots a flame when backfires. I adjusted the valves still backfire disconnect programmer still backfire then I let the quad idle and the shifted side exhaust burned red hot brake side seems to be getting fuel in it ??

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2 Answers

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 ...

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Jan 31, 2016 | Motorcycles

1 Answer

I have a 2001 yamaha yz426f that backfires after start and shoots flame from exaust and the exaust gets so hot it glows red.


Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
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.
http://www.raptorforum.com/forums/66-raptor-660-maintenance/71417-just-cleaned-carb-now-exhaust-getting-red-hot-after-idling-only-2min.html
YZ 426 RED hot header pipe backfiring YZ 400 426 450
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual Page 3

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Feb 08, 2014 | 2001 Yamaha YZ 426 F

1 Answer

What causes back firing


Backfiring in internal combustion engines occur outside of the combustion chamber, and are typically the result of an improper air to fuel ratio. An overly lean air-fuel mixture (i.e. an overabundance of air) can lead to a failure to ignite in the combustion chamber, also called a "misfire". The unburnt fuel then enters the exhaust system, where hot components can cause the fuel to ignite unpredictably. Alternatively, rich air-fuel mixtures (i.e. an overabundance of fuel) can result in incomplete combustion, again causing unburnt fuel to enter the exhaust system.
Backfires may also occur before the combustion chamber. One possible cause of this is timing. If the timing is too advanced, the spark plug fires before the intake valves close, causing the combustion to propagate into the intake manifold, further igniting the air-fuel mixture there; the resulting explosion then travels out of the carburetor and air filter. On many small marine engines, a screen is placed over the intake of the carburetor as a flame arrestor, to prevent these flames from escaping the intake and potentially igniting fuel or fuel vapors in the enclosed sump or bilge of the boat, causing a fire or explosion. Alternatively, the engine timing may be retarded, in which case the combustion is not completed by the time the exhaust valves open, allowing the combustion to propagate into the exhaust system.
Additionally, improperly adjusted carburetors that create a lean condition during acceleration can cause the air fuel mixture to burn so slowly, that combustion is still taking place during the exhaust stroke, and even when the intake valve opens. The flame front can then travel up the intake and cause a backfire. In this situation it is conceivable that there is a backfire occurring in the intake manifold and exhaust manifold simultaneously.
In both cases (combustion occurring before and after the combustion chamber), the result is a sharp pop, which is colloquially referred to as a "backfire". However, for troubleshooting, engine mechanics more strictly define an ignition of fuel within the engine exhaust system as an "afterfire", while a "backfire" is this same process taking place in the induction system.

Jul 28, 2013 | Exhaust for Chevrolet Camaro Convertible

1 Answer

Backfiring intake


Too much fuel in one of the cylinders ? Valve problems ?

Jul 07, 2013 | Nissan Xterra Cars & Trucks

1 Answer

Datsun 1200 motor


BACKFIRE TROUGH EXHAUST IS A VALVE TIMING ISSUE!
WHILE ON THE POWER (EXPLOSION) STROKE...EXHAUST VALVE IS OPENING TOO SOON ...WHILE FLAME PATH IS STILL IGNITED, SENDING IT OUT EXHAUST. I WOULD PERFORM A VALVE ADJUSTMENT AT A MINIMUM

Jul 05, 2013 | Motorsports

1 Answer

What causes a lot of backfire?


Backfiring with flames usually means 2 things1) Rich mixture (lots of fuel). The spark plugs becomes black powdered. Need good carburetor setup (main jet, needle, pilot screw adjustments)2) Poor valve sealing. Damaged valve seats causes that. Need to take apart the cylinder head and grind the valves (procedure that all mechanics know). That means that when the mixture is compressed inside the chamber and ignited part of the mixture explosion escapes from the leaking valve's seat to the exhaust, so concentrated unburnt fuel in the exhaust catches fire and explodes through the exhaust, creating the flame.

Feb 06, 2012 | Suzuki Boulevard S50 Motorcycles

1 Answer

Bike backfires and at an idle it shoots out a blue flame


Purchase a EFI controller. I suggest a Fi2000R. It is easy to hook up and fairly easy to set by the instructions.

Aug 15, 2009 | 2004 Yamaha FJR 1300

1 Answer

What causes our 1986 chevy motorhome to back fire through the carburator? This occurs when you first take off, it stops after awhile when warmed up. Carburator has been rebuilt, new plugs, wires and cap....


Backfire in an automobile engine typically results from various malfunctions related to the air fuel ratio. Backfiring can occur in carburetor engines that are running lean where the air-fuel mixture has insufficient fuel and whenever the timing is too advanced. As the engine runs leaner or if there is less time for the fuel to burn in the combustion chamber, there is a tendency for incomplete combustion. The condition that causes this is a misfire. The result of a misfire or incomplete combustion is that unburned fuel or flammable hydrocarbons are delivered to the exhaust manifold where it may ignite unpredictably.


When starting an engine, timing that is too advanced will fire the spark plug before the intake valve is closed. The flame front will travel back in to the intake manifold, igniting all of that air and fuel as well. The resulting explosion then travels out of the carburetor and air cleaner. A common air filter will allow the gases to escape, but will block the flame front. On many small marine engines, no air filter is used, but a screen is placed over the intake of the carburetor as a flame arrest to prevent these flames from escaping the intake, and potentially igniting fuel, or fuel vapors in the enclosed sump or bilge of the boat and causing a fire or explosion. Improperly adjusted carburetors that create a lean condition during acceleration can cause the air fuel mixture to burn so slowly, that combustion is still taking place during the exhaust stroke, and even when the intake valve opens. The flame front can then travel up the intake and cause a backfire. In this situation it is conceivable that there is a backfire occurring in the intake manifold and exhaust manifold simultaneously.

Good luck and hope this helps, check the carburetor settings to make sure it's not running too lean and the timing . Keep me posted, be glad to help you get your RV running 100% again.

Jul 14, 2009 | 1995 Chevrolet C/K 3500

1 Answer

Generator hard to start and backfiring


Sound like you've done things in the correct order, tecumseh's are notorious for carb problems if you let as sit in them. Backfiring is timing related (flywheel key) or valve problems. I would take a closer look at the exhaust valve I don't believe it is closing all the way.

Mar 16, 2009 | Coleman Powermate Powermate 5000W...

1 Answer

Hard to start and backfires from muffler when running


Sounds like the timing may be off or maybethe exhaust valve maybe hanging open.

Mar 15, 2009 | Tecumseh Horizontal Tiller Engine 8 Hp, 1"...

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