Maximum Timing; Idle Adjustment; Throttle Cable Installation - Mercury 45 Jet 50-55 Service Manual

MAXIMUM TIMING

1. Hold control arm (a) so that maximum spark advance
screw (b) is against stop. Crank engine with starter mo-
tor and adjust maximum spark advance screw to align
the specified BTDC timing mark on flywheel with timing
pointer. Tighten locknut (c).
c
NOTE: All timing adjustments made to engine under crank-
ing speed conditions should be verified with engine running
and adjustments made if necessary. This is due to advance
characteristics of individual ignition systems.

Idle Adjustment

1. With engine is water, connect electrical harness and
fuel line to engine. Start engine and allow to warm up.
2. Properly adjust carburetor low speed mixture screws.
Initial setting is 1-1/4 turns off seat.
2C-4 - ELECTRICAL and IGNITION
3. Hold throttle arm at idle position (throttle cable barrel
removed from barrel retainer). Adjust idle timing screw
(a) to attain an engine idle RPM of 650-750 RPM in
"FORWARD" gear. Tighten locknut (b) and turn off en-
gine.
b
a

Throttle Cable Installation

1. With end of throttle cable connected to throttle lever,
hold throttle lever against idle stop. Adjust throttle
cable barrel to slip into barrel retainer on cable anchor
51045
bracket with a very light preload of throttle lever against
idle stop. Lock barrel in place.
IMPORTANT: Excessive preload on throttle cable will
cause difficulty when shifting from forward to neutral.
(Re-adjust throttle cable barrel, if necessary.)
2. Check preload on throttle cable by placing a thin piece
of paper between idle stop screw and idle stop. Pre-
load is correct when paper can be removed without
tearing but has some drag on it. Re-adjust throttle
cable barrel, if necessary.
a
b
51045
90-817643R1 DECEMBER 1996