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ENGINE
7. Install:
• Oil filler cap
8. Inspect:
• Engine (for oil leaks)
•Oil level
CHECKING THE OIL PRESSURE
1. Check:
• Oil pressure
Checking steps:
a. Slightly loosen the oil pressure check bolt
"1".
b. Start the engine and keep it idling until oil
starts to seep from the oil pressure check
bolt. If no oil comes out after one minute,
turn the engine off so it will not seize.
c. Check oil passages and oil pump for dam-
age or leakage.
d. Start the engine after solving the problem(s)
and recheck the oil pressure.
e. Tighten the oil pressure check bolt.
ADJUSTING THE ENGINE IDLING SPEED
• Because the air pressure is lower at high alti-
tudes, the air-fuel mixture will become richer.
If the engine idling speed is low, turn the start-
er (choke) knob/idling screw a few clicks
counterclockwise to increase the idling speed.
• Before adjusting the engine idling speed,
make sure that the compression pressure is
within specification and that the air filter ele-
ment is not clogged.
• Adjust the engine idling speed with the starter
(choke) knob/idling screw pushed in com-
pletely.
1. Start the engine and warm it up until the en-
gine oil has reached the specified tempera-
ture.
2. Use a temperature probe tester "1" and con-
tact it to the drain bolt thread.
3. Adjust:
• Engine idling speed
Adjustment steps:
a. Turn the starter knob/idle screw "1" until the
specified engine idling speed.
Using the digital tachometer, measure the en-
gine speed with the detector "c" pinched in the
high tension cord "2" of the ignition coil.
Oil pressure check bolt:
10 Nm (1.0 m•kg, 7.2 ft•lb)
Oil temperature:
55.0–65.0 °C (131–149°F)
Digital tachometer:
YU-39951-B/90890-06760
To increase the engine idling speed→Turn
the starter (choke) knob/idling screw
counterclockwise "a".
To decrease the engine idling speed →
Turn the starter (choke) knob/idling
screw clockwise "b".
Engine idling speed:
1,900–2,100 r/min