Yamaha MWS150-C Owner's Manual page 60

Periodic maintenance and adjustment
To change the engine oil and clean
the oil strainer
1. Start the engine, warm it up for
several minutes, and then turn it
off.
2. Place an oil pan under the engine
to collect the used oil.
3. Remove the engine oil filler cap
and engine oil drain bolts A and B
to drain the oil from the crankcase.
NOTICE: When removing the
engine oil drain bolt B, the O-
ring, compression spring, and
oil strainer will fall out. Take
care not to lose these parts.
7
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2
3
4
5
6
1. Engine oil drain bolt A
2. Gasket
3. Oil strainer
4. Compression spring
5. O-ring
6. Engine oil drain bolt B
4. Clean the engine oil strainer with
solvent, and then check it for
damage and replace it if neces-
sary.
5. Install the engine oil strainer, com-
pression spring, new O-ring and
engine oil drain bolt B.
TIP
Make sure that the O-ring is properly
seated.
7-13
6. Install engine oil drain bolt A and
1
its new gasket, and then tighten
both drain bolts to their specified
torques.
Tightening torque:
Engine oil drain bolt A:
20 N·m (2.0 kgf·m, 14 lb·ft)
Engine oil drain bolt B:
32 N·m (3.2 kgf·m, 23 lb·ft)
7. Refill with the specified amount of
the recommended engine oil, and
then install and tighten the oil filler
cap.
Recommended engine oil:
See page 9-1.
Oil quantity:
0.90 L (0.95 US qt, 0.79 Imp.qt)
TIP
Be sure to wipe off spilled oil on any
parts after the engine and exhaust sys-
tem have cooled down.
NOTICE
 In order to prevent clutch slip-
page (since the engine oil also
lubricates the clutch), do not
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