Motorcycle

Tier 1 - 2006–2009 - 1.4 - 12.0
Tier 2 - 2010 and later - 0.8 - 12.0
The maximum acceptable legal emissions of hydrocarbon and carbon monoxide for new Class I and II motorcycles (50 cc–169 cc and 170 cc–279 cc respectively) sold in the United States are as follows: