demperolie ZS 175CD carburateur

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While lifting the air valve you’ll notice there is resistance to lifting it rapidly. (You can try this on the carb you haven’t disassembled. If there is little resistance, try adding oil.) You’ll also notice that that when released, the air valve drops quickly. When the throttle is opened, the damper slows the air valve rise causing increased velocity and increased depression over the jet sucking in more fuel and producing the richer mixture desired when accelerating. As the air valve rises, the depression and hence the mixture is leaned back to normal.

During deceleration, a process in reverse to the above takes place. When the throttle closes, the amount of airflow is reduced radically. If the air valve stays up, the velocity of the air over the jet drops to a very low value and the mixture is very lean. This can cause a slow burn in the engine resulting in popping back in the carb and explosions in the exhaust system (backfires). The air valve must drop very rapidity during deceleration to prevent the overly lean mixture and associated side effects.