Mariner 100, Service Manual, Page: 62 / 391

2C-3 ELECTRICAL AND IGNITION 90-13645--2 1095
11. Holding throttle arm against throttle stop screw,
adjust cam follower, so that a clearance of 0.005
in. - 0.020 in. (0.127 - 0.508 mm) exists between
roller of cam follower and throttle cam. Tighten set
screw securing cam follower.
52472
a
b
c
0.005
″
– 0.020
″
a - Roller
b - Throttle Cam
c - Set Screw
CARBURETOR/OIL PUMP SYNCHRONIZATION
IMPORTANT: Some engines may have an addi-
tional stamped mark (d) which SHOULD NOT be
used.
1. While holding throttle arm at idle position, adjust
length of link rod so that stamped mark of oil pump
body aligns with stamped mark of oil pump lever.
22977
a
b
c
d
a - Link Rod
b - Mark of Oil Pump Body c - Mark of Oil Pump Lever
d - Mark NOT Used
TIMING ADJUSTMENTS
Engine is timed while cranking engine with starter
motor. To prevent engine from starting when
being cranked, all spark plugs must be removed,
except no. 1 (top) cylinder plug.
CAUTION
NOTE: If initial timing adjustments are made without
engine running, then final timing checks should be
made with engine running due to timing advance
characteristics of ignition system. Minimum engine
RPM required to check maximum timing advance is
3000 RPM.
IDLE TIMING ADJUSTMENT
1. Connect timing light to no. 1 (top) spark plug.
WARNING
Before cranking engine, keep clear of propeller as
it may rotate.
2. Shift engine to “Neutral”.
IMPORTANT: To accurately time engine at cranking
speed, a fully charged battery must be used.
3. Holding throttle arm at idle position, crank engine
with starter motor and adjust idle timing screw to
align 2
°
BTDC timing mark of flywheel with timing
pointer. Tighten locknut.
2
°
BTDC
4 0 4
20442
b
a
a - Idle Timing Screw
b - Locknut