Yamaha TMAX 2020 Service Manual page 98

• Center cover
• Fuel tank cover assembly
• Side cover
• Rear side cowling assembly
• Footboard
Refer to "GENERAL CHASSIS (2)" on
page 4-11.
2. Remove:
• Radiator bracket
Refer to "RADIATOR" on page 6-3.
3. Remove:
• Spark plug
• Cylinder head cover
• Cylinder head cover gasket
Refer to "CAMSHAFTS" on page 5-12.
4. Remove:
• Timing mark accessing plug
• Crankshaft end access cover
Refer to "V-BELT AUTOMATIC TRANSMIS-
SION" on page 5-39.
5. Measure:
• Valve clearance
Out of specification  Adjust.
Valve clearance (cold)
Intake
0.15–0.22 mm (0.0059–0.0087 in)
Exhaust
0.25–0.32 mm (0.0098–0.0126 in)
a. Turn the crankshaft clockwise.
b. When piston #1 is at TDC on the compres-
sion stroke, align the "I" mark "a" on the
generator rotor with the mark "b" on the
generator cover.
PERIODIC MAINTENANCE
TIP
• TDC on the compression stroke can be found
when the cylinder #1 camshaft lobes are
turned away from each other.
• In order to be sure that the piston is at TDC, the
alignment mark "c" on the intake camshaft
sprocket and the alignment mark "d" on the ex-
haust camshaft sprocket must align with the
cylinder head mating surface as shown in the
illustration.
c. Measure the valve clearance with a thick-
ness gauge.
TIP
• If the valve clearance is incorrect, record the
measured reading.
• Measure the valve clearance in the following
sequence.
Thickness gauge
90890-03268
Feeler gauge set
YU-26900-9
Valve clearance measuring sequence
Cylinder #1  #2
3-6
b
a