Ignition Timing Adjustment - Yamaha 50G Service Manual

INSP
ADJ
PERIODIC SERVICE
1 Timing indicator
2 Full-advance indication (75, 80 hp)
3 Full-advance indication (90 hp)
4 Full-advance adjusting screw

IGNITION TIMING ADJUSTMENT

CAUTION:
When checking ignition timing using a tim-
ing light, be sure to replace the propeller
with the specified test propeller, and make
tests with the machine placed in a test
tank.
NOTE:
Before adjusting, be sure to warm up the
engine.
1. Attach the timing light and tachometer
to the No. 1 cylinder high tension code.
2. While keeping the stopper in contact
with the full-retard adjusting screw,
measure the full-retard ignition timing
with the timing light.
If the timing is out of specification,
adjust it by turning the full-retard
adjusting screw.
NOTE:
When measuring the full-retard ignition
timing, keep the specified engine speed.
Full-retard side engine speed:
800 ± 50 rpm
Full-retard side ignition timing:
50, 60, 70 hp: 7 ± 1˚ ATDC
75, 80, 90 hp: 8 ± 1˚ ATDC
3-8
E