Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 71Get this manual

TIMING AND SYNCHRONIZATION
Special Tools
1Dial Indicator Gauge Kit (91-58222A1)

2Dial Indicator Adaptor Kit (91-83155)

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