Mercury 40 Service Manual

2
C
TIMING, SYNCHRONIZING, & ADJUSTING
90-828631R3 MARCH 1999 Page 2C-1
ELECTRICAL
Section 2C - Timing, Synchronizing, & Adjusting
Table of Contents
Specifications 2C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Tools 2C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Carburetor Adjustments 2C-3. . . . . . . . . . . . . . . . . . . .
Idle Speed Adjustment 2C-3. . . . . . . . . . . . . . . . . .
Carburetor Sync. – Dynamic Adjustment 2C-4. .
Idle Mixture Screw Adjustment 2C-7. . . . . . . . . . .
Dash-Pot Adjustment 2C-9. . . . . . . . . . . . . . . . . . .
Timing 2C-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
IGNITION SYSTEM*
*Readings taken @ 68°F
(20°C).
Type
Spark Plug Type (NGK)
Spark Plug Gap
Firing Order
Ignition Timing:
40/45 HP
Fully Retarded
Fully Advanced (2500-3000 rpm)
50 HP
Fully Retarded
Fully Advanced (2500-3000 rpm)
Charge Coil Resistance
Trigger Coil Resistance
Ignition Coil Resistance:
Primary
Secondary
C.D.I. Engine Speed Limiter
C.D.I. Overheat Speed Control
Engine Temperature Switch
Below 131° F (55° C)
Above 104° F (40° C)
Capacitor Discharge Ignition
NGK DPR6EA-9
0.035 in. (1.0 mm)
1-3-4-2
5° B.T.D.C
25° B.T.D.C
5° B.T.D.C
35° B.T.D.C
272 - 408 Ω (BRN-BLU)
396 - 594 Ω (WHT/BLK-WHT/RED)
0.1 - 0.7 Ω
3.5 - 4.7 kΩ
6120 - 6280 rpm
1600 - 2400 rpm
No Continuity
Continuity
CARBURETOR
Idle rpm (Out Of Gear)
45 hp
40/50 hp
Idle rpm (In Forward Gear)
45 hp
40/50 hp
Wide Open Throttle rpm (WOT)
Range
Main Jet Size
40/45 hp
Carburetors 1 and 2
Carburetors 3 and 4
50 hp
Pilot Jet
Float Height
950 ± 25 rpm
825 ± 25 rpm
850 ± 25 rpm
725 ± 25 rpm
5500–6000 rpm
#104
#103
#112
#42
0.39 ± 0.02 in. (10.0 ± 0.5 mm)

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