Mercury 40 Service Manual

TIMING, SYNCHRONIZING, & ADJUSTING
90-828631R3 MARCH 1999 Page 2C-11
1. Place the outboard in “Forward” gear and check timing at idle “Retarded.” (If not within
specification window, refer to Diagnostic Test Procedures Section 2A.)
5°
a
a-Timing Mark (Full Retarded)
2. Slowly increase the engine rpm while watching the ignition timing marks. The timing
should increase to the maximum timing specification “Full Advance” at approximately
2500-3000 RPM. (If not within specification window, refer to Diagnostic Test Procedures
Section 2A.)
35°
25°
40/45 hp
50 hp
a
a-Timing Mark (Full Advance)

Mercury 40 Specifications

General

Horsepower	40 hp
Starting System	Electric
Steering	Remote
Fuel Induction System	EFI (Electronic Fuel Injection)
Shaft Length	20"
Full Throttle RPM Range	6000