Usually the atomisers on carburettors intended for two-stroke engines are manufactured in two types: with either long or short upper parts. 一般用於二行程化油器的霧化管製造有分兩種類型:長跟短的頭部
The atomisers with longer upper parts cause a weakening of the mixture at low speeds and during acceleration from low speed; on the other hand, atomisers with shorter upper parts produce extra enrichment. 頭部較長的霧化管,導致混合氣在低速和從低速加速時減弱 頭部較短的霧化管能產生額外的壓縮。
Carburettors for racing motorcycles use atomisers with short upper parts. 競技摩托車的化油器使用頭部較短的霧化管。