Emissions of gaseous pollutant from motorcycle powered by ethanol-gasoline blend

► E15 could be applied in carburetor and fuel-injected motorcycles without any engine adjustment. ► E15 blend applied in motorcycles reducing emissions of CO, alkane, alkene, and aromatic. ► E15 blend applied in motorcycles increasing acetaldehyde emission significantly. ► OFP of motorcycle exhaust reduced as using E15 blend instead of gasoline. ► Emission variances from fuel-injected motorcycle were smaller than the value of carburetor.