Yamaha YXR70FX Service Manual page 169

d
c
1
CYLINDER HEAD
7. Check:
a
• "I" mark a
TIP:
Check that the "I" mark on the AC magneto
b rotor is aligned with the stationary pointer b
on the AC magneto cover.
• "I" mark c
TIP:
Check that the "I" mark on the camshaft
sprocket is aligned with the stationary pointer
d on the cylinder head.
Out of alignment → Correct.
Repeat steps (4) to (7), if necessary.
8. Tighten:
• camshaft sprocket bolts 1
• decompressor assembly bolts 2
2
TIP:
• While holding the AC magneto rotor nut with
a wrench, tighten the camshaft sprocket
bolts and decompressor assembly bolts.
• After tightening the decompressor assembly
bolts, check that decompressor assembly
moves smoothly.
NOTICE
_
Be sure to tighten the camshaft sprocket
bolts to the specified torque to avoid the
possibility of the bolts coming loose and
damaging the engine.
9. Measure:
• valve clearance
Out of specification → Adjust.
Refer
CLEARANCE" in chapter 3.
4 - 19
ENG
20 Nm (2.0 m · kg, 14 ft · lb)
20 Nm (2.0 m · kg, 14 ft · lb)
to "ADJUSTING THE VALVE