This article discusses the use of Pertamax fuel and young coconut bioethanol with mixed variations (BE5, BE10, BE15, BE20) on injection step motorcycle exhaust emissions. The methodology used in this study is the post test only design control, one of the research in qualitative research. The research data is primary data, obtained directly on the gas analyzer during the trial. All data is then collected, looking for average test results, described and closed with a different test (t test). Based on the data obtained at the time of testing there was a decrease in CO and HC gas levels with each additional amount of young coconut ethanol in Pertamax fuel. The results of the difference analysis test (t test) are not significant, t arithmetic
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