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New Chinese national standards on motorcycles and mopeds exhaust emission have been published. Technical feasibility study of use of catalytic converters on Chinese two-stroke motorcycles was conducted by means of mileage tests. 100, 90 and 50 ml motorcycles were included in the test fleet and different converters coated in China were tested. Different factors producing different effects on converter performance were investigated such as exhaust temperature, lubrication oil, and second air injection system.

The key point of reducing idling pollutants from two-stroke engine is to improve gas exchanging quality. This paper proposed a new construction of air-head scavenging project- labyrinth air-head scavenging project. Test results prove that this project together with delaying ignition timing, increasing idling delivery ratio and high-energy ignition can make the idling pollutants of 1E46FM engine reducing from HC> 8000ppm to 5800ppm and CO from 4.8% to <2.0%.