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装备越野摩托车的二冲程单缸发动机,气缸容积为250～350厘米~3。这种大排量发动机的应用在稳步地上升。众所周知,该类型车辆为越野摩托车。最常用越野摩托车是以非公路行驶或大街上行驶差不多等量的。因此,用于越野摩托车发动机必须使速度和负荷在较大范围内具有最佳性能。特别是发动机工作必须稳定,转速必须平稳。然而,单缸排量为250或350厘米~3的二冲程发动机在部分负荷下转速为4000～5000转/分时,由于运转不稳定产生颤动及刺耳的金属声而造成的发动机不正常噪声等情况就会经常出现。这些情况是由发动机不正常燃烧引起的,并且与汽化器调整有密切关系。当空气和燃油混合物为稀浓度时,这些问题就变得特别突出了。
Equipped with two-stroke single-cylinder motocross engine, cylinder capacity of 250 ~ 350 cm ~ 3. The use of such large displacement engines is steadily rising. As we all know, this type of vehicle is a motocross. The most commonly used off-road motorcycles are traveling on off-road or on the streets about the same amount. Therefore, motocross engines must be optimized for speed and load in a wide range of applications. In particular, the engine must be stable, the speed must be stable. However, two-stroke engines with a single cylinder displacement of 250 or 350 cm -3, at engine speed of 4000-5000 rpm at part load, unusual noise of the engine due to vibrations and harsh metal sounds caused by unstable operation, etc. The situation will often appear. These conditions are caused by abnormal combustion of the engine, and are closely related to the carburetor adjustment. These issues become particularly prominent when the air and fuel mixture are lean in concentration.