Mercury 40 FourStroke User Manual

2
C
TIMING, SYNCHRONIZING, & ADJUSTING
90-857046R1 NOVEMBER 2001 Page 2C-1
ELECTRICAL
Section 2C - Timing, Synchronizing, & Adjusting
Table of Contents
Specifications 2C-1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Tools 2C-2. . . . . . . . . . . . . . . . . . . . . . . . . . .
Timing 2C-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Carburetor Synchronization 2C-6. . . . . . . . . . . . . . .
Idle Speed Adjustment 2C-10. . . . . . . . . . . . . . . . . . .
Specifications
IGNITION
SYSTEM
Readings taken @
68°F (20°C).
Type
Spark Plug:
Type
Gap
Hex Size
Torque
Hole Size
Firing Order
Ignition Timing:
@ Idle (800 rpm)
@ WOT (6000 rpm)
Charge Coil Resistance
Crank Position Sensor Resistance
Ignition Coil Resistance:
Primary
Secondary (W/o Boots)
ECM Engine Speed Limiter
Soft Reduction (Retards Timing)
Spark Cut-Out Reduction (Percent-
ages of ignition spark are Cut-Out)
ECM Overheat/Low Oil Pressure
Speed Control
Engine Temperature Sensor
Capacitor Discharge Ignition
NGK DPR6EA-9
0.035 in. (0.9 mm)
18 mm
150 lb-in. (17 Nm)
12mm
1-2-3
10° A.T.D.C
28° B.T.D.C
660 - 710 Ω (GRN/WHT - WHT/GRN)
300 - 350 Ω (RED - WHT)
0.08 - 0.7 Ω (BLK - BLK/WHT)
3.5 - 4.7 kΩ (BLK - High Tension)
6200 rpm
6250 rpm
Approximately 2000 rpm
See Graph Section 2A-Ignition
NOTE: The 30/40 four stroke ECM unit electronically controls the ignition timing, there-
fore making the ignition timing non adjustable. When initially running the outboard, use
a timing light to verify that the ignition timing falls within the timing windows. If the ignition
timing does not stay within the timing windows, replace the ignition ECM unit and retest.

Mercury 40 FourStroke Specifications

General

Brand	Mercury
Model	40 FourStroke
Category	Outboard Motor
Language	English