Mercury V8 250 User Manual

Ignition Specifications ‑ V6 Models
Description Specification
Full throttle RPM range
200 SeaPro 4600–5400
175 and 200 5000–5800
175 Pro XS 5400–6000
225 5200–6000
Idle RPM (see NOTE) 600
Ignition type Digital inductive
Spark plug type NGK LKAR7C‑9
Spark plug gap 0.9 mm (0.035 in.)
Spark plug hex size 14 mm
Spark plug torque 20 Nm (177 lb‑in.)
Firing order 1‑2‑3‑4‑5‑6
Ignition timing at idle
Not adjustable; PCM controlled
(approximately 2° ATDC)
Ignition timing at WOT Not adjustable; PCM controlled
PCM overspeed limiter See chart
NOTE: The idle RPM set point may increase due to the low battery voltage ramp‑up strategy.
Ignition Specifications ‑ V8 Models
Description
Specification
Full throttle RPM range
SeaPro 4800–5600
250 and 300 5200–6000
Pro XS 5600–6200
Idle RPM (see NOTE) 600
Ignition type Digital inductive
Spark plug type NGK LKAR7C‑9
Spark plug gap 0.9 mm (0.035 in.)
Spark plug hex size 14 mm
Spark plug torque 20 Nm (177 lb‑in.)
Firing order 1‑2‑7‑3‑4‑5‑6‑8
Ignition timing at idle
Not adjustable; PCM controlled
(approximately 2° ATDC)
Ignition timing at WOT Not adjustable; PCM controlled
Special Tools
CDS G3 Interface Kit
8M0138392
66165
CDS G3 License Key, Interface, Adapter, and Harness
Spark Gap Tester 91‑850439T 1
7513
Provides a visual indication of spark/coil efficiency.
Ignition
Page 6A-2 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018

Mercury V8 250 Specifications

General

Brand	Mercury
Model	V8 250
Category	Outboard Motor
Language	English