Checking The Ignition Timing - Yamaha 55DEHD Service Manual

CHK
ADJ

Checking the ignition timing

NOTE:
Install the test propeller, when checking the
ignition timing.
Test propeller : 90890-01620
1. Place the lower unit in water, and then
start the engine and warm it for 5 min-
utes.
2. Turn off the engine when the engine has
been completely warmed up.
3. Disconnect the throttle cable 1 and
remove the throttle link rod 2, then set
the control lever 2 3 to the full retard
position.
NOTE:
To disconnect and connect the throttle cable,
refer to page 3-7.
3-9
Periodic check and adjustment
3
2
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4. Attach the special service tool 4 and 5
to the spark plug wire #1, and then start
the engine. Check the engine idle speed
and ignition timing.
Digital tachometer 4: 90890-06760
Timing light 5: 90890-03141
Engine idle speed:
5. Check that the ignition timing is specified
position a, when the full retard.
1
Specified position a (full retard):
4
5
750–850 r/min
BTDC 1–3°
68830180
a
68830190
6885J11