Ignition Specifications; Idle Timing Adjustment (All Models); Maximum Timing Adjustment (All Models) - Mercury 25 EFI Service Manual

Timing, Synchronizing and Adjustments

Ignition Specifications

Ignition type
Spark plug
Spark plug gap
Firing order
Ignition timing at idle
Ignition timing at WOT
RPM overspeed
ECM RPM limiter (Guardian)
Over temperature
Low oil pressure (over 5 seconds)
Crankshaft position sensor
Ignition coil
Primary
Secondary
Spark plug lead (between spark plug cap and black lead)
Special Tools
CDS G3 Diagnostic Tool Kit
Crankshaft Holding Tool

Idle Timing Adjustment (All Models)

Idle timing is not adjustable. Idle timing is controlled by the PCM/ECM. Idle timing can be monitored with the Computer
Diagnostic System (CDS).
CDS G3 Diagnostic Tool Kit

Maximum Timing Adjustment (All Models)

Maximum timing is not adjustable. Maximum timing is controlled by the PCM/ECM. Maximum timing can be monitored with the
Computer Diagnostic System (CDS).
CDS G3 Diagnostic Tool Kit
Page 2C-2
Ignition Specifications at 20 °C (68 °F)
Interfaces CDS G3 software to SmartCraft network.
NOTE: This kit includes download instructions and a license key.
60575
Holds the crankshaft while tightening the timing belt drive gear retaining nut.
3455
© 2016 Mercury Marine
Computer controlled CDI (capacitor discharge ignition)
NGK DCPR6E
0.8–0.9 mm (0.031–0.035 in.)
1, 3, 2
5° ± 5° BTDC
38° BTDC
6300 RPM
2800 RPM
90 °C (194 °F)
24.5 kPa (3.5 psi)
148–222 ohms
0.17–0.23 ohms
3.3–4.9 k ohms
7.1–11.1 k ohms
8M0114141
91‑898101360
8M0114141
8M0114141
90-8M0105568 eng MARCH 2016