Warm-up performance

Warm-up performance is the speed at which the engine warms up after being started. The faster it warms up, the better the warm-up performance.
Immediately after the engine is started, most of the fuel supplied by the carburetor is in close contact with the intake wall, with only some of fuel actually reaching the inside of the cylinders.
Within the cylinders, the fuel becomes a diluted air-fuel mixture with less vaporized gasoline than air, which results in misfiring or in incomplete combustion due to unvaporized gasoline particles.
As the engine warms up, any gasoline adhering to the intake pipes volatilizes, enabling normal operation to be achieved.

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