Yamaha YFZ 50 Owner's Manual page 90

2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Place an oil pan under the engine to collect
the used oil.
4. Remove the engine oil filler cap, and then re-
move the engine oil drain bolt to drain the oil
from the crankcase. NOTICE: When remov-
ing the engine oil drain bolt, the compres-
sion spring, oil strainer and O-ring will fall
out. Take care not to lose these parts.
[ECB00312]
9
1. Oil strainer
2. Compression spring
3. O-ring
4. Engine oil drain bolt
5. Clean the oil strainer with solvent.
6. Discard the old engine oil drain bolt O-ring,
and then apply a thin coat of clean engine oil
to the new O-ring.
7. Install the oil strainer, the compression
spring, the new O-ring and the engine oil
drain bolt. Tighten the engine oil drain bolt to
the specified torque. NOTICE: Before in-
stalling the engine oil drain bolt, be sure to
install the O-ring, compression spring and
oil strainer.
Tightening torque:
1
Engine oil drain bolt:
25 N·m (2.5 kgf·m, 18 lb·ft)
2
8. Refill with the specified amount of the recom-
mended engine oil.
3
Recommended oil:
4
See page 11-1.
Oil quantity:
0.80 L (0.85 US qt, 0.70 Imp.qt)
9-13
[ECB00322]