Yamaha R15 2022 Service Manual page 117

Valve clearance (cold)
Intake
0.10–0.14 mm (0.0039–0.0055 in)
Exhaust
0.21–0.25 mm (0.0083–0.0098 in)
a. Turn the crankshaft counterclockwise.
b. Align the TDC mark "a" on the magneto ro-
tor with the stationary pointer "b" on the
magneto cover.
c. When the piston is at TDC on the com-
pression stroke, align the "I" mark "c" on
the camshaft sprocket with the mark "d" on
the camshaft stopper plate.
d. Check that the cam lobes are positioned
as shown in the illustration.
e. Measure the valve clearance with a feeler
gauge "1".
Out of specification → Adjust.
ENGINE
6. Adjust:
• Valve clearance
a. Loosen the locknut "1".
b. Insert a feeler gauge "2" between the end
of the adjusting screw and the valve tip.
c. Turn the adjusting screw "3" in direction
"a" or "b" until the specified valve clear-
ance is obtained.
Direction "a"
Valve clearance is increased.
Direction "b"
Valve clearance is decreased.
3-5
CHK
ADJ
(a)
(b)