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INSP
ADJ
PERIODIC SERVICE
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 at least
of 0.1 cc to confirm that the specified
amount is discharge.
Specified discharge:
(each port)
0.7 ± 0.3 cm
(0.025 ± 0.011 Imp oz,
0.024 ± 0.010 US oz)
NOTE:
When measuring with the measuring cyl-
inder, ensure that no oil clings to the cyl-
inder
wall,
measurement will be inaccurate.
Use only genuine Yamaha oil, for if the
viscosity is too high or too low, the mea-
surement of the discharge will be inaccu-
rate.
The longer the time over which measure-
ment is made, the more accurate will be
the measurement. Calculate the rate of
discharge per minute.
D31600-1
CARBURETOR
1. Check the fuel passages and air pas-
sages for fouling or clogging. Clean
fouled parts with suitable cleaning sol-
vent and blow out clogged passages
with compressed air.
WARNING
Protect your eyes with suitable safety spec-
tacles or safety goggles when using com-
pressed air.
2. Check the needle-valve for wear, and
replace it if worn.
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