Yamaha FJR1300R, Service Manual

Page: 148 / 572

3 - 32
CHK
ADJ
MEASURING THE COMPRESSION PRESSURE
6. Install:
• compression gauge adapter
1
• compression gauge
2
7. Install:
• fuel tank
8. Measure:
• compression pressure
Out of specification
→
Refer to steps (c)
and (d).
▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼
a. Set the main switch to “ON”.
b. With the throttle wide open, crank the
engine until the reading on the compression
gauge stabilizes.
WARNING
@
To prevent sparking, ground all spark plug
leads before cranking the engine.
NOTE:
@
The difference in compression pressure
between cylinders should not exceed 100 kPa
(1 kg/cm
2
, 14.22 psi).
c. If the compression pressure is above the
maximum specification, check the cylinder
head, valve surfaces and piston crown for
carbon deposits.
Carbon deposits
→
Eliminate.
d. If the compression pressure is below the
minimum specification, squirt a few drops of
oil into the cylinder and measure again.
Compression gauge set
14/18 mm
YU-33223
Compression gauge adapter
12 mm
YU-33223-3
Compression pressure (at sea
level)
Minimum
1,390 kPa (13.9 kg/cm
2
, 198 psi)
Standard
1,600 kPa (16.0 kg/cm
2
, 228 psi)
Maximum
1,790 kPa (17.9 kg/cm
2
, 255 psi)