1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 134Get this manual

FUEL DELIVERY SYSTEM
NOTE: For Models NOT equipped with an idle speed screw:
1Loosen cam locking screw2Press cam follower down until it contacts throttle cam3Retighten cam locking screw

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