TOHATSU BFT 150A Owner's Manual page 109

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