Yamaha YZF-R7 Owner's Service Manual page 90

MEASURING THE COMPRESSION PRESSURE
1 1
2 2
3. Remove:
• fuel tank
• air filter case cover
Refer to "FUEL TANK AND AIR FIL-
TER".
• air filter case
• throttle body assembly
Refer to "ELECTRONIC FUEL INJEC-
TION" in chapter 6.
• ignition coil
4. Remove:
• spark plug
CAUTION:
ACHTUNG:
Before removing the spark plugs, use
compressed air to blow away any dirt
accumulated in the spark plug wells to
prevent it from falling into the cylinders.
5. Install:
• compression gauge 1
• adapter 2
Compression gauge
90890-03081
Adapter
90890-04136
6. Measure:
• compression pressure
Out of specification
(c) and (d).
Compression pressure (at sea
level)
Minimum
Standard
Maximum
a. Set the main switch to "ON".
b. With the throttle wide open, crank the
engine until the reading on the com-
pression gauge stabilizes.
3 - 21
CHK
ADJ
Refer to steps
1,500 kPa
2
(15.0 kg/cm , 213 psi)
1,600 kPa
2
(16.0 kg/cm , 228 psi)
1,700 kPa
2
(17.0 kg/cm , 242 psi)