Carb flames are causes by a variety of things. most often the engine is advanced to far or you have a carb leak interally that puts to much fuel in the engine. If the engine has high miles the intake valves may be leaking allow the flame to escape around it.
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Flames coming from a carburetor are typically caused by a backfire, which occurs when unburnt fuel in the exhaust system ignites. This can happen due to issues such as a rich air-fuel mixture, faulty ignition timing, or a clogged exhaust system. It is important to address the root cause of the backfire to prevent potential damage to the engine.
A carburetor backfire flame arrester is designed to prevent flames or sparks from escaping the carburetor during a backfire. It is typically located at the top of the carburetor and consists of a mesh screen or metal plate with small holes that allow air to pass through while trapping any flames or sparks. This helps to prevent potential fires or explosions.
Not quite sure what you are asking but there are flames with both solid and liquid fuels
Blue flames typically produce the maximum amount of heat when compared to other colored flames. This is because blue flames burn at a higher temperature due to complete combustion and greater oxygen supply.
The two main types of flames are blue flames and yellow flames. Blue flames indicate clean, efficient combustion with sufficient oxygen, while yellow flames indicate incomplete combustion with impurities present.
Yellow flames typically indicate an incomplete combustion process, due to a lack of oxygen or inefficient burning of fuel. They tend to be cooler compared to blue flames and can produce more soot and pollutants. Yellow flames can be a sign of a malfunctioning gas appliance or poor ventilation.