Yamaha Star XVS13AA(C) 2011 Service Manual page 142

Valve clearance (cold)
Intake
0.09–0.13 mm (0.0035–0.0051 in)
Exhaust
0.14–0.18 mm (0.0055–0.0071 in)
M MMM M MMM M M MMM M M MMM M
Front cylinder
a. Turn the crankshaft counterclockwise.
b. When the front cylinder piston is at TDC on
the compression stroke, align the TDC mark
"a" on the generator rotor with the slot "b" in
the generator cover.
TIP
• When the piston is at TDC on the compression
stroke, there should be clearance between the
valve stem tips and their respective rocker arm
adjusting screws.
• If there is no clearance, rotate the crankshaft
counterclockwise one turn.
c. 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 M MMM M MMM
b
b
a a
L LLL L L LLL L LLL
3-5
M MMM M MMM M M MMM M M MMM M
Rear cylinder
a. Turn the crankshaft counterclockwise from
the front cylinder piston TDC by 300 degrees.
b. When the rear cylinder piston is at TDC on
the compression stroke, align the TDC mark
"c" on the generator rotor with the slot "d" in
the generator cover.
TIP
• When the piston is at TDC on the compression
stroke, there should be clearance between the
valve stem tips and their respective rocker arm
adjusting screws.
• If there is no clearance, rotate the crankshaft
counterclockwise one turn.
c. 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
12.Adjust:
• Valve clearance
M MMM M MMM M M MMM M M MMM M
a. Loosen the locknut "1".
1
b. Insert a thickness gauge "2" between the end
of the adjusting screw and the valve tip.
ENGINE
M MMM M M MMM M MMM
d
c
L LLL L L LLL L LLL
M MMM M M MMM M MMM