Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 118Get this manual
Quality of the image is intentionally reduced!
TIMING, SYNCHRONIZING,ADJUSTING
Cyl#1 CylCyl
aCarburetor Synchronization Screw- Carburetor Synchronization Screw #2
6 Rev engine few times and let engine idle for 15 se