Yamaha TMAX 2020 Service Manual

5-32
CYLINDER AND PISTONS
d. If out of specification, replace the piston and
piston rings as a set.
e. Calculate the piston-to-cylinder clearance
with the following formula.
f. If out of specification, replace the cylinder,
piston and piston rings as a set.
EAS30292
CHECKING THE PISTON RINGS
1. Measure:
• Piston ring side clearance
Out of specification  Replace the piston
and piston rings as a set.
TIP
Before measuring the piston ring side clearance,
eliminate any carbon deposits from the piston
ring grooves and piston rings.
2. Install:
• Piston ring
(into the cylinder)
TIP
Use the piston crown to level the piston ring near
the bottom of the cylinder where the cylinder
wear is lowest.
3. Measure:
• Piston ring end gap
Out of specification  Replace the piston ring
set.
TIP
The oil ring expander spacer’s end gap cannot
be measured. If the oil ring rail’s gap is exces-
sive, replace all three piston rings.
a. 8.0 mm (0.31 in) from the bottom edge of
the piston
Piston
Diameter
69.975–69.990 mm
(2.7549–2.7555 in)
Piston-to-cylinder clearance =
Cylinder bore -
Piston skirt diameter
Piston-to-cylinder clearance
0.010–0.035 mm (0.0004–0.0014
in)
a
b
G089001
Piston ring
Top ring
Ring side clearance
0.030–0.065 mm
(0.0012–0.0026 in)
Side clearance limit
0.115 mm (0.0045 in)
2nd ring
Ring side clearance
0.020–0.055 mm
(0.0008–0.0022 in)
Side clearance limit
0.115 mm (0.0045 in)
Piston ring
Top ring
End gap limit
0.50 mm (0.0197 in)
2nd ring
End gap limit
0.85 mm (0.0335 in)
G089002

Yamaha TMAX 2020 Specifications

General

Displacement	562cc
Bore x Stroke	70.0 mm x 73.0 mm
Compression Ratio	10.9:1
Fuel System	Fuel Injection
Ignition System	TCI
Transmission	V-Belt Automatic
Rear Suspension	Swingarm
Front Brake	Hydraulic dual disc, Ø267 mm
Rear Brake	Hydraulic single disc, Ø282 mm
Front Tyre	120/70R15M/C 56H
Rear Tyre	160/60R15M/C 67H
Overall Length	2, 200 mm
Overall Width	765 mm
Seat Height	800 mm
Wheelbase	1, 575 mm
Wet Weight	218 kg
Fuel Tank Capacity	15 litres
Engine Type	Liquid-cooled, 4-stroke, DOHC, 4-valve
Maximum Torque	55.7 Nm @ 5, 250 rpm
Front Suspension	Telescopic fork
Overall Height	1, 420mm