Mariner Mercury 105/140 JET, Service Manual

Page: 111 / 797

90-824052R3 JUNE 2002 ELECTRICAL - 2C-9
STATIC IDLE TIMING ADJUSTMENT
(CRANKING ENGINE WITH STARTER)
Disconnect WHITE/BLACK lead (1) from idle
stabilizer box at bullet connector (2). Disconnect
ECU harness for ignition timing procedure.
1
2
CAUTION
Models equipped with Idle Stabilizer Shift Kit
Accessory (P/N 87-814281A1), excluding 175 EFI
models, require maximum timing (cranking
speed) to be retarded 3
°
from specifications
listed on page 2C-2. Note, Stabilizer Shift Kit is
standard on 175 EFI models and already has
retarded timing degrees calibrated into
specifications listed on page 2C-2.
Idle Stabilizer Shift System
50707
a
b
c
d
a - Inner Switch Box
b - To Outer Switch Box
c - Diode
d - Shift Interrupt Switch
1. Connect timing light to No 1 spark plug lead (TOP
STARBOARD BANK).
WARNING
While cranking engine, keep clear of propeller, as
it may rotate.
IMPORTANT: To accurately time engine cranking
speed, a fully charged battery must be used.
2. Connect timing light to no.1 cylinder spark plug
lead. Crank engine with starter (about 300 RPM)
while holding throttle arm (1) against idle stop.
Adjust idle spark adjustment screw (2) to attain
appropriate setting. Tighten locknut (3).
2
3
1