Yamaha F20A, Service Manual

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3-5
INSP
ADJ
E
POWER UNIT
6. Install:
●
Engine oil filler cap
7. Check:
●
Engine oil level
Refer to “Engine oil level”.
NOTE:
●
Run the engine for several minutes, turn it
off, and then check the engine oil level.
●
If the engine oil is still not at the proper
level, add or drain as needed.
Valve clearance adjustment
NOTE:
Valve clearance adjustment should be
made on a cold engine, at room tempera-
ture.
1. Measure:
●
Intake valve clearance
a
●
Exhaust valve clearance
b
Use feeler gauge.
Out of specification
→
Adjust.
Valve clearance:
Intake: 0.2
±
0.05 mm
(0.008
±
0.002 in)
Exhaust: 0.3
±
0.05 mm
(0.012
±
0.002 in)
Measurement steps:
●
Disconnect the fuel hoses 1 , ignition
coil leads and spark plug leads 2 .
●
Remove the cylinder head cover.
●
Turn the flywheel magneto and align
mark “
” 3 on the driven sprocket
with mark “ ” 4 on the cylinder
block.
●
Measure the valve clearance using the
feeler gauge for cylinder #1.
●
Align mark “
●
” 5 on the driven
sprocket with mark “ ” 4 on the cyl-
inder block and then measure the
valve clearance for cylinder #2.