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In order to improve the fuel economy and CO2 emission for motorcycles, manufacturers have developed and commercialized motorcycles equipped with idle-stop (also known as stop-start) systems. Some test data have shown that such motorcycles may cause 55% more exhaust emissions over the test driving cycle when idle-stop function is on, and fail to meet the functionality expectations of reducing emissions from such motorcycles. Two market sold idle-stop motorcycle types were tested on chassis dynamometer to investigate their transient exhaust emissions over six different driving cycles with idle-stop function on and off separately. Further more, the feasibility of emissions improvement by adjusting ECU calibration was also evaluated.