Yesterday while riding it start backfiring and throwing flames out the exhaust this morning started it was still the same thing rode it down the road pushed it pretty hard then it died started rite back up now its running fine it also has strait pipes on it dont know about the jetting i just bought it
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Re: engine back fire
Hi ...... If problem continues try switching petrol off at the tap overnight or when you stop the bike. Sounds like petrol is leaking pass the petrol tap and sitting in the bores and exhausts, soon as you start it up it's igniting in the pipes. Remove the plugs and the colour will indicate how the jetting is set up.
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Wasted spark system. If fuel and electrical is all good/correct it is often the case in these symptoms that motor cycle spark plugs that although looking good and firing outside of the engine are breaking down and will not fire under compression pressures on a power stroke but will fire unburned fuel on the unpressurized exhaust stroke when the plug again fires in a wasted spark ignition system and when so firing the result is a backfire, usually quite loud.
This could possibly be caused by several things however the most logical and common reason is simply a sheered flywheel key. This will throw the engine out of time allowing it to fire out of sequence when valves are open instead of closed. I hope this helps you and gets you going again.
This could be a result of several different things, however the most common of these would be a sheered flywheel key. If this is the case it has throwed the motor out of time and is trying to fire while the exhaust valve is open causing the backfire and lack of compression to start. I hope this has helped.
Check your mufflers. Such problems are usually common with exhaust systems so the first take you should have had was to check them before thinking of your plugs. If you need more about bike functionality then you can check my exhaust for details..
Blue flame out the exhaust means the timing is off. When you readjusted the valves, you really got the timing off. Go back and start over. When you are at top-dead center, the valves for that cylinder have to be closed. Good luck.
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.