Editing Motorcycle (section)

===United States emissions limits===
The following table shows maximum acceptable legal emissions of the combination of hydrocarbons, oxides of nitrogen, and carbon monoxide for new motorcycles sold in the United States with 280&nbsp;cc or greater [[piston displacement]].<ref name=usepa>{{cite web |url=http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&SID=0a57ac29b59ade8455648e60e739a181&rgn=div5&view=text&node=40:19.0.1.1.2&idno=40#40:19.0.1.1.2.5 |title=EPA Emissions Regulations for 1978 and Later New Motorcycles, General Provisions |access-date=7 December 2013 |publisher=[[United States Environmental Protection Agency]] |archive-date=30 March 2014 |archive-url=https://web.archive.org/web/20140330155049/http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&SID=0a57ac29b59ade8455648e60e739a181&rgn=div5&view=text&node=40:19.0.1.1.2&idno=40#40:19.0.1.1.2.5 |url-status=live }}</ref>

{| class="wikitable"
|-
! Tier
! Model year
! HC+NOx (g/km)
! CO (g/km)
|-
| Tier 1
| 2006&ndash;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&nbsp;cc&ndash;169&nbsp;cc and 170&nbsp;cc&ndash;279&nbsp;cc respectively) sold in the United States are as follows:<ref name=usepa/>
{| class="wikitable"
|-
! Model year
! HC (g/km)
! CO (g/km)
|-
| 2006 and later
| 1.0
| 12.0
|}