Motorcycle

The following table shows maximum acceptable legal emissions of the combination of hydrocarbon and nitrous oxides, as well as carbon monoxide, for new Class III motorcycles (280 cc or larger displacement) sold in the United States.
Tier - Model year - HC+NOx (g/km) - CO (g/km)
Tier 1 - 2006–2009 - 1.4 - 12.0