Yamaha F50D Servise Manual page 144

POWR
3. Turn the flywheel magnet clockwise and
align the "1" mark a on the driven
sprocket with the "▲" mark b on the cyl-
inder head.
4. Check the intake valve clearance c for
cylinders #1 and #2, and the exhaust
valve clearance d for cylinders #1 and
#3. Adjust if out of specification.
d
Valve clearance:
Intake c:
0.20 ± 0.05 mm (0.008 ± 0.002 in)
Exhaust d:
0.30 ± 0.05 mm (0.012 ± 0.002 in)
5. Turn the flywheel magnet clockwise and
align the "4" mark e on the driven
sprocket with the "▲" mark b on the cyl-
inder head.
7-3
Power unit
b
a
c
b
e
6. Check the intake valve clearance c for
cylinders #3 and #4, and the exhaust
valve clearance d for cylinders #2 and
#4. Adjust if out of specification.
7. Loosen the valve adjusting locknut 4,
and then turn the adjusting screw 5 until
the specified valve clearance is obtained.
4
TIP:
9 To decrease the valve clearance, turn the
adjusting screw 5 in direction f.
9 To increase the valve clearance, turn the
adjusting screw 5 in direction g.
8. Tighten the valve adjusting locknut 4,
and then check the valve clearances.
Valve adjusting locknut:
13.5 N·m (1.4 kgf·m, 10.0 ft·lb)
9. Install the cylinder head cover 3, fuel
pump 2, and spark plugs.
10. Connect the blowby hose 1 and spark
plug wires, and then install the flywheel
magnet cover.
g
f
5