Yamaha XV19SW Service Manual page 96

d. Measure the valve clearance with a thickness
gauge.
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
L LLL L LLL L L LLL L L LLL L
M MMM M MMM M M MMM M M MMM M
Piston #2 TDC (front cylinder)
a. Turn the crankshaft counterclockwise from
the piston #1 TDC by 408 degrees.
b. When piston #2 is at TDC on the compres-
sion stroke, align the TDC mark "e" on the
crankshaft position sensor rotor with the
pointer "b" on the clutch cover.
c. Check the camshaft drive gear mark "c" posi-
tion and camshaft driven gear mark "d" posi-
tion as shown.
d
d. Measure the valve clearance with a thickness
gauge.
d
c
L LLL L L LLL L LLL
M MMM M M MMM M MMM
e
b
c
3-6
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
L LLL L LLL L L LLL L L LLL L
12.Adjust:
• Valve clearance
M MMM M MMM M M MMM M M MMM M
a. Loosen the locknut "1".
b. Insert a thickness gauge "2" between the end
of the adjusting screw and the valve tip.
Thickness gauge
90890-03180
Feeler gauge set
YU-26900-9
c. Turn the adjusting screw "3" in direction "a" or
"b" with the tappet adjusting tool "4" until the
specified valve clearance is obtained.
Tappet adjusting tool (4 mm)
90890-04133
Valve adjustment wrench 3 mm &
4 mm
YM-08035-A
Adjusting
screw side
Valve clear-
Direction "a" ance is in-
creased.
Valve clear-
Direction "b" ance is de-
creased.
ENGINE
L LLL L L LLL L LLL
M MMM M M MMM M MMM
1
Slip side
Valve clear-
ance is de-
creased.
Valve clear-
ance is in-
creased.