Yamaha YFM7FGPW Service Manual page 98

ADJUSTING THE VALVE CLEARANCE
2
1
2
d
c
4. Disconnect:
1
• spark plug cap 1
5. Remove:
• spark plug 2
6. Remove:
• timing mark accessing screw 1
• crankshaft end accessing screw 2
7. Measure:
• valve clearance
M MMM
a
a. Turn the crankshaft counterclockwise.
b. When the piston is at the top dead center
b
NOTE:
To position the piston at top dead center (TDC)
on the compression stroke, align the "I" mark
c on the camshaft sprocket with the stationary
pointer d on the cylinder head, as shown in
the illustration.
3 - 17
Out of specification → Adjust.
Valve clearance (cold)
Intake valve
0.09 ~ 0.13 mm
(0.0035 ~ 0.0051 in)
Exhaust valve
0.16 ~ 0.20 mm
(0.0063 ~ 0.0079 in)
M MMM M M MMM M M MMM M
(TDC) on the compression stroke, align the
"I" mark a on the AC magneto rotor with
the stationary pointer b on the AC magneto
cover.
CHK
ADJ
M MMM M M MMM M MMM