Yamaha MIO Service Manual page 63

ADJUSTING THE VALVE CLEARANCE
b
a
1
2
1
b
a
3
4. Measure:
d
M
a. Turn the crankshaft clockwise.
b. When the piston is at the Top Dead Center
c
c. Align the "I" mark c on the A.C. magneto
d. Measure the valve clearance with a thick-
L
5. Adjust:
M
a. Loosen the locknut 1.
b. Insert a thickness gauge 2 between the
c. Turn the adjusting screw 3 in direction a
3 - 9
• valve clearance
Out of specification → Adjust.
Valve clearance (cold)
Intake valve
0.06 ~ 0.10 mm
(0.0024 ~ 0.0039 in)
Exhaust valve
0.08 ~ 0.12 mm
(0.0031 ~ 0.0047 in)
MMM M MMM M M MMM M M MMM
(TDC) on the compression stroke, align the
"I" mark a in the camshaft sprocket with the
stationary b on the cylinder head.
rotor with the stationary pointer d on the
crankcase.
ness gauge 1.
Out of specification → Adjust.
LLL L LLL L L LLL L L LLL
• valve clearance
MMM M MMM M M MMM M M MMM
end of the adjusting screw and the valve tip.
or b until the specified valve clearance is
obtained.
Valve clearance is
Direction a
increased.
Valve clearance is
Direction b
decreased.
Tappet adjusting tool
90890-01311
CHK
ADJ
M M MMM M M MMM M
L L LLL L L LLL L
M M MMM M M MMM M
MMM
LLL
MMM