1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 31Get this manual

GENERAL INFORMATION
Conditions Affecting Performance
Weather
Rated hp Horsepower Loss Due to Atmosphere Conditions Secondary Loss Due to Propeller Becoming To Large for Summer Horsepower

Summer hp

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