Yamaha YP250R 2005 Service Manual page 71

ADJUSTING THE VALVE CLEARANCE
b
a
5. Measure:
• valve clearance
Out of specification → Adjust.
Valve clearance (cold)
Intake valve
0.08 ~ 0.12 mm
(0.0031 ~ 0.0047 in)
Exhaust valve
0.16 ~ 0.20 mm
(0.0063 ~ 0.0079 in)
M MMM M MMM M M MMM
a. Turn the primary sheave nut on the left side
of the crankshaft counterclockwise to turn
the crankshaft.
b. When the piston is at TDC on the compres-
sion stroke, align the "I" mark a on the
camshaft sprocket with the stationary
pointer b on the cylinder head.
c. Align the "I" mark c on the generator rotor
with the stationary pointer d on the genera-
tor cover.
d. Measure the valve clearance with a thick-
ness gauge 1.
Out of specification → Adjust.
L LLL L LLL L L LLL
3 - 9
CHK
ADJ
M M MMM M M MMM M
L L LLL L L LLL L
M MMM M MMM
L LLL L LLL