Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 112Get this manual

TIMING, SYNCHRONIZING,AOJUSTING
Special Tools
1Carburetor Tuner PIN 91-80964 1A 1

2DMT 2000 Digital Tachometer Multi-meter PIN 91-854009A 1

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