Honda bf50d Owner's Manual page 122

TECHNICAL INFORMATION
One Star
Low
Emission
Two Stars
Very Low
Emission
Three Stars
Ultra Low
Emission
Four Stars
Super Ultra
Low Emission
120
The one-star label identifies engines that meet the Air Resources Board's
Personal Watercraft and Outboard marine engine 2001 exhaust emission
standards. Engines meeting these standards have 75% lower emissions than
conventional carbureted two-stroke engines. These engines are equivalent
to the U.S. EPA's 2006 standards for marine engines.
The two-star label identifies engines that meet the Air Resources Board's
Personal Watercraft and Outboard marine engine 2004 exhaust emission
standards. Engines meeting these standards have 20% lower emissions than
One Star-Low Emission engines.
The three-star label identifies engines that meet the Air Resources Board's
Personal Watercraft and Outboard marine engine 2008 exhaust emission
standards or the Sterndrive and Inboard marine engine 2003-2008 exhaust
emission standards. Engines meeting these standards have 65% lower
emissions than One Star-Low Emission engines.
The four-star label identifies engines that meet the Air Resources Board's
Sterndrive and Inboard marine engine 2009 exhaust emission standards.
Personal Watercraft and Outboard marine engines may also comply with
these standards. Engines meeting these standards have 90% lower emissions
than One Star-Low Emission engines.
Cleaner Watercraft - Get the Facts
1-800-END-SMOG
www.arb.ca.gov