Question about 2005 Honda NF 100 Wave

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My wave alpha is having back fires on it's exhaust pipe once a let go of the throttle. what maybe the cause of this ?? i've clean the carburator already replace the spark plugs tested a new cdi .. still back fires.

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Spark plug! replace a new spark plug

Posted on Jul 16, 2012

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Check fuel quality, if ok,
check valve clearances, if ok,
check ignition timing

Posted on Jan 08, 2011

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The most common cause of back firing is un-burned gasoline in the cylinder. Make sure your air filter is clean and there are no spider webs in the air-intake manafold. Also, be sure your spark plug is clean (new). Finally, check that the spark plug wire is not damaged/cracked. Each of these can allow excess fuel to exist in the cylinder and cause back firing. This process does not always occur in the cylinder. Fuel can also build up in the muffler and burns/explodes once the muffler gets hot enough (but that is rare on such a small engine with a muffler that gets as hot as your generator should).

Another issue is carbon buildup. This hot soot (carbon) on the piston and cylinder head to store heat from previous combustion cycles of the engine. This carbon eventually gets so hot that it can ignite the fuel/air mixture entering the cylinder BEFORE the spark plug ignites it. Having that fuel mixture explode when the exhaust valve is still closed makes the engine hemmorage and make strage noises once the exhaust valves to open. This is called pre-ignition. It is not as loud as a backfire but it is loud.

In summary, clean your air filter, and air box, and have the carburator adjusted back to factory specs (if anyone tried to turn any screws on the carburator since it was new). If the unit has not been used much, it is likely the air filter. If it has been used heavily, then the soot/carbon build up is likely an issue.

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* in carburetor, might some residue,rust and other particles is stacked up that's,might get overflowed and this is one reason why it backs fire. need to overhaul the entire carburetor and it should be clean as well

* Ignition timing or distributor is connected to high-tension wire that may cause lose thread. this may fix when the engine is starting while adjusting distributor to a certain timing.

* muffler and exhausted pipe, it the some pipe got to much carbon and rust, this will stop the pressure coming from the engine and it takes back fire. To solve this, simply spray water on muffler using a hose and then start accelerating gas until carbon and rust comes out. (this is what i've done in my car,and it works)

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