2001 Mercury Mariner 50-60HP Factory Service Manual, Page 190Get this manual

EMISSIONS
Exhaust Emissions Standards
Through the Environmental Protection Agency (EPA), the federal government has established exhaust emissions standards for all new marine engines sold in the U.S
What Are Emissions?

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives