Valve Clearance Adjustment - Yamaha F20A Service Manual

INSP
ADJ
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:
Exhaust: 0.3 ± 0.05 mm
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 "
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.
3-5
0.2 ± 0.05 mm
(0.008 ± 0.002 in)
(0.012 ± 0.002 in)
" 4 on the cylinder
E