3-10
INSP
ADJ
E
PERIODIC SERVICE
D34000-0*
OIL INJECTION PUMP
OPERATIONAL TEST
1. Start the engine and set the idling
speed at 1,500 rpm by adjusting the
throttle-stop lever.
CAUTION:
Use only oil-mixed fuel (50:1) as malfunc-
tion or engine seizure may otherwise
result.
2. Remove the oil-pump link-rod and fix
the oil-pump lever in the full-throttle
position.
3. Measure the oil discharge from each
port for three minutes using a measur-
ing cylinder graduated in steps of at
least 0.1 cc to confirm that the specified
amount is discharged.
NOTE:
Oil temperature: 10 ~ 30˚C (50 ~ 86˚F)
1. Before measuring, bleed the pump com-
pletely and ensure no air-bubbles are
present in the oil flowing out of the oil
feed pipe.
2. When measuring with the measuring cyl-
inder, ensure that no oil clings to the cyl-
inder wall, otherwise the measurement
will be inaccurate.
3. Use only genuine Yamaha oil. If the vis-
cosity is too high or too low, the mea-
surement of the discharge will be
inaccurate.
4. The longer the time over which measure-
ment is made, the more accurate will be
the measurement. Calculate the rate of
discharge per minute.
Specified discharge:
(3 min/1 cylinder)
50 hp:
1.90 ± 0.50 cm
3
(0.064 ± 0.017
US oz, 0.067 ± 0.018 Imp oz)
60, 70 hp:
2.20 ± 0.50 cm
3
(0.074 ± 0.017
US oz, 0.077 ± 0.018 Imp oz)
75, 80, 90 hp:
3.10 ± 0.70 cm
3
(0.105 ± 0.024
US oz, 0.0109 ± 0.025 Imp oz)
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