Checking The Cylinder And Piston; Checking The Piston Rings - Yamaha FZ1-N 2007 Service Manual

Manuals by Motomatrix / www.motomatrix.co.uk / The Solution For Lost Motorcycle Coded Keys
NOTE:
Identify the position of each crankshaft journal
upper bearing so that it can be reinstalled in its
original place.
EAS24390

CHECKING THE CYLINDER AND PISTON

1. Check:
• Piston wall
• Cylinder wall
Vertical scratches → Replace the cylinder,
and the piston and piston rings as a set.
2. Measure:
• Piston-to-cylinder clearance
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Measure cylinder bore "C" with the cylinder
bore gauge.
NOTE:
Measure cylinder bore "C" by taking side-to-
side and front-to-back measurements of the
cylinder. Then, find the average of the mea-
surements.
Cylinder bore "C"
Wear limit
Taper limit "T"
Out of round "R"
maximum of D
"C" =
maximum of D
"T" =
of D or D
5
maximum of D
"R" =
minimum of D
b. If out of specification, replace the cylinder,
and the pistons and piston rings as a set.
c. Measure piston skirt diameter "P" with the
micrometer.
email: info@motomatrix.co.uk
77.00 – 77.01 mm
(3.0315 – 3.0319 in)
77.06 mm (3.03 in)
0.005 mm (0.0002 in)
0.005 mm (0.0002 in)
– D
1 6
or D – maximum
1 2
6
D or D –
1 3 5
D or D
2 4 6
4 mm (0.16 in) "a" from the bottom edge of
the piston
Piston size "P"
76.975 - 76.990 mm
(3.0305 - 3.0311 in)
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.
Piston-to-cylinder clearance =
Cylinder bore "C" –
Piston skirt diameter "P"
Piston-to-cylinder clearance
0.010–0.035
0.0014 in)
Limit
0.12 mm (0.0047 in)
f. If out of specification, replace the cylinder,
and the piston and piston rings as a set.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
EAS24430

CHECKING THE PISTON RINGS

1. Measure:
• Piston ring side clearance
Out of specification → Replace the piston
and piston rings as a set.
NOTE:
Before measuring the piston ring side clear-
ance, eliminate any carbon deposits from the
piston ring grooves and piston rings.
5-69
CRANKSHAFT
mm (0.0004–