唐立春，李清砺，赵卫卫

（山东华盛农业药械有限责任公司）

    摘要:本文以一款市场常见排量51ml二冲程汽油机为例，研究该类小型二冲程汽油机由满足中国第一阶段排放标准改进提升至满足第二阶段排放标准时，由于改变空气过量系数而引起的汽油机各项参数及可靠性能的规律性变化。

    关键词:小型二冲程汽油机；空气过量系数；排放

   Abstract:This article is based on a 51ml displacement 2-stroke gasoline engine that is common on market, in the process of improving this kind of small gasoline engine from meeting Chinese first stage emission standard to meet Chinese second stage emission standard, researching the correlation between excess air factor and engine parameters as well as durability.

    Keywords: Small two-stroke gasoline engine；    Excess air factor；Emissions