Mariner 80 - Maximum Timing

2C-9ELECTRICAL AND IGNITION90-13645--2 1095
1. Connect timing light to no. 1 (top) spark plug lead.
2. Shift engine into neutral.
3. Holding throttle arm at idle position, crank engine
with starter motor and adjust idle timing screw to
align 2 degrees BTDC timing mark of flywheel with
timing pointer. Tighten locknut.
23005
a
b
a - Idle Timing Screw
b - Locknut
MAXIMUM TIMING
1. Hold control arm against maximum advance stop.
Crank engine with starter motor and adjust maxi-
mum advance screw to align 25° BTDC mark on
flywheel with timing pointer (due to the advance
characteristics of ignition system, this cranking
speed adjustment will automatically be reduced
to 23° BTDC at engine speed of 5000 RPM).
Tighten locknut.
NOTE: If initial timing adjustments are made without
engine running, then final timing checks should be
made with engine running due timing advance char-
acteristics of ignition system. Minimum engine RPM
required to check maximum timing advance is 3000
RPM.
23005
a
b
c
a - Control Arm
b - Maximum Advance Screw
c - Locknut